Lexington Weather

Current Conditions [‒] Current Conditions [+]

90.1°F Warmer than last hour.

32.3°C

Feels like 99.3°F

Hot

Clear

Today: Hi 96 °F

Tonight: Lo 76 °F

Dew Point: 73.9°F

Humidity: 59% Decreased 8.0% since last hour.

Air Quality Index: 43

Good

(Ozone)

Barometer: 29.86 in S

1011 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Tuesday: 0.00 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 3 mph

OTHER PERSONAL WEATHER STATIONS

Alerts / Advisories [‒] Alerts / Advisories [+]

Southeast Middlesex County, MA - Extreme Heat Warning - Air Quality Alert - Air Quality Alert
- SEE ALL NEARBY ALERTS -

NWS Weather Forecast -
Today, Tonight, & Thursday through Tuesday Night

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Wed Jul 1, 2026 4:30am EDT

Overview:

- Dangerous prolonged heat and humidity Wed through Sat with max afternoon heat indices in the 98 to 112 degree range with little relief at night. Peak of the heat Thu into Fri.

- A cluster of showers and a few thunderstorms may impact parts of our region very late today into tonight. Activity likely weakening with main severe weather risk to our northwest, but cannot rule out a low risk across western MA/CT.

- W/NW flow aloft may bring a low convective/severe weather risk Wed-Fri. However, limited forcing and cap may keep us mainly dry. Greatest risk for thunderstorms/severe weather potential might wait until Independence Day with the actual cold front.

Air Quality Alert
Air Quality Alert
Extreme Heat Warning

Today:

Chance Showers And T-Storms

Hi 96 °F

A chance of showers and thunderstorms before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 96. Heat index values as high as 105. Southwest wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

Tonight:

Chance Showers And T-Storms

Lo 76 °F

Tonight: Chance Showers And Thunderstorms

A chance of showers and thunderstorms before midnight, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Heat index values as high as 101. Southwest wind around 10 mph. Chance of precipitation is 40%.

Thursday:

Slight Chance Showers And T-Storms then Mostly Sunny

Hi 102 °F

Thursday: Slight Chance Showers And Thunderstorms then Mostly Sunny

A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 102. Heat index values as high as 111. West wind 8 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

Thursday Night:

Mostly Clear

Lo 75 °F

Mostly clear, with a low around 75. Heat index values as high as 105. West wind 7 to 12 mph. Chance of precipitation is 20%.

Friday:

Sunny

Hi 98 °F

Sunny, with a high near 98. West wind 7 to 12 mph.

Friday Night:

Mostly Clear

Lo 73 °F

Mostly clear, with a low around 73. West wind 5 to 10 mph.

Independence Day:

Sunny then Slight Chance Showers And T-Storms

Hi 95 °F

Independence Day: Sunny then Slight Chance Showers And Thunderstorms

A slight chance of showers and thunderstorms after 3pm. Sunny, with a high near 95. West wind 5 to 9 mph.

Saturday Night:

Slight Chance Showers And T-Storms

Lo 70 °F

Saturday Night: Slight Chance Showers And Thunderstorms

A slight chance of showers and thunderstorms before 4am. Partly cloudy, with a low around 70. Northwest wind 3 to 7 mph.

Sunday:

Partly Sunny then Chance Showers And T-Storms

Hi 88 °F

Sunday: Partly Sunny then Chance Showers And Thunderstorms

A slight chance of rain showers between noon and 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. Northeast wind 3 to 7 mph. Chance of precipitation is 40%.

Sunday Night:

Chance Showers And T-Storms

Lo 66 °F

Sunday Night: Chance Showers And Thunderstorms

A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 2 to 6 mph. Chance of precipitation is 50%.

Monday:

Chance Rain Showers

Hi 83 °F

A chance of rain showers. Partly sunny, with a high near 83. East wind 2 to 8 mph. Chance of precipitation is 50%.

Monday Night:

Chance Rain Showers

Lo 65 °F

A chance of rain showers. Mostly cloudy, with a low around 65. Northeast wind around 6 mph. Chance of precipitation is 50%.

Tuesday:

Slight Chance Rain Showers then Slight Chance Showers And T-Storms

Hi 83 °F

Tuesday: Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms

A slight chance of rain showers before 8am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Northeast wind 3 to 8 mph.

Tuesday Night:

Partly Cloudy

Lo 63 °F

Partly cloudy, with a low around 63. South wind 2 to 6 mph.

FULL FORECAST

NWS Hourly Forecast -
Today 12pm through Thu 11pm

Issued by:
National Weather Service Boston / Norton, MA
Updated Wed Jul 1, 2026 4:30am EDT

12:00pm

Chance Showers And Thunderstorms

90°F
Dew Pt 71°F
Heat Index: 96°F
Wind from SW

SW 10 mph
Precip: 31%

1:00pm

Chance Showers And Thunderstorms

92°F
Dew Pt 71°F
Heat Index: 99°F
Wind from SW

SW 9 mph
Precip: 31%

2:00pm

Chance Showers And Thunderstorms

94°F
Dew Pt 72°F
Heat Index: 102°F
Wind from SW

SW 9 mph
Precip: 36%

3:00pm

Chance Showers And Thunderstorms

95°F
Dew Pt 72°F
Heat Index: 104°F
Wind from SW

SW 9 mph
Precip: 40%

4:00pm

Chance Showers And Thunderstorms

96°F
Dew Pt 72°F
Heat Index: 105°F
Wind from SW

SW 10 mph
Precip: 38%

5:00pm

Chance Showers And Thunderstorms

95°F
Dew Pt 73°F
Heat Index: 105°F
Wind from SW

SW 10 mph
Precip: 36%

6:00pm

Chance Showers And Thunderstorms

93°F
Dew Pt 72°F
Heat Index: 101°F
Wind from SW

SW 10 mph
Precip: 36%

7:00pm

Chance Showers And Thunderstorms

90°F
Dew Pt 73°F
Heat Index: 98°F
Wind from SW

SW 10 mph
Precip: 36%

8:00pm

Chance Showers And Thunderstorms

88°F
Dew Pt 73°F
Heat Index: 96°F
Wind from SW

SW 10 mph
Precip: 31%

9:00pm

Chance Showers And Thunderstorms

85°F
Dew Pt 73°F
Heat Index: 92°F
Wind from SW

SW 10 mph
Precip: 31%

10:00pm

Chance Showers And Thunderstorms

83°F
Dew Pt 72°F
Heat Index: 88°F
Wind from SW

SW 10 mph
Precip: 32%

11:00pm

Chance Showers And Thunderstorms

81°F
Dew Pt 72°F
Heat Index: 85°F
Wind from SW

SW 10 mph
Precip: 32%

Thu
12:00am

Chance Showers And Thunderstorms

80°F
Dew Pt 72°F
Heat Index: 84°F
Wind from SW

SW 9 mph
Precip: 32%

Thu
1:00am

Chance Showers And Thunderstorms

79°F
Dew Pt 72°F
Wind from SW

SW 9 mph
Precip: 32%

Thu
2:00am

Mostly Cloudy

78°F
Dew Pt 72°F
Wind from SW

SW 8 mph
Precip: 32%

Thu
3:00am

Chance Showers And Thunderstorms

77°F
Dew Pt 72°F
Wind from SW

SW 8 mph
Precip: 32%

Thu
4:00am

Chance Showers And Thunderstorms

77°F
Dew Pt 72°F
Wind from SW

SW 8 mph
Precip: 29%

Thu
5:00am

Chance Showers And Thunderstorms

77°F
Dew Pt 72°F
Wind from SW

SW 8 mph
Precip: 26%

Thu
6:00am

Slight Chance Showers And Thunderstorms

78°F
Dew Pt 72°F
Wind from SW

SW 8 mph
Precip: 23%

Thu
7:00am

Mostly Sunny

80°F
Dew Pt 73°F
Heat Index: 84°F
Wind from W

W 8 mph
Precip: 20%

Thu
8:00am

Mostly Sunny

82°F
Dew Pt 73°F
Heat Index: 87°F
Wind from W

W 8 mph
Precip: 17%

Thu
9:00am

Mostly Sunny

86°F
Dew Pt 74°F
Heat Index: 94°F
Wind from W

W 8 mph
Precip: 17%

Thu
10:00am

Mostly Sunny

91°F
Dew Pt 74°F
Heat Index: 101°F
Wind from W

W 9 mph
Precip: 18%

Thu
11:00am

Mostly Sunny

95°F
Dew Pt 75°F
Heat Index: 107°F
Wind from W

W 9 mph
Precip: 18%

Thu
12:00pm

Mostly Sunny

98°F
Dew Pt 74°F
Heat Index: 110°F
Wind from W

W 9 mph
Precip: 19%

Thu
1:00pm

Mostly Sunny

100°F
Dew Pt 73°F
Heat Index: 111°F
Wind from W

W 10 mph
Precip: 19%

Thu
2:00pm

Mostly Sunny

101°F
Dew Pt 72°F
Heat Index: 111°F
Wind from W

W 10 mph
Precip: 20%

Thu
3:00pm

Mostly Sunny

102°F
Dew Pt 71°F
Heat Index: 111°F
Wind from W

W 12 mph
Precip: 20%

Thu
4:00pm

Mostly Sunny

102°F
Dew Pt 70°F
Heat Index: 110°F
Wind from W

W 12 mph
Precip: 20%

Thu
5:00pm

Mostly Sunny

101°F
Dew Pt 69°F
Heat Index: 108°F
Wind from W

W 13 mph
Precip: 20%

Thu
6:00pm

Partly Cloudy

98°F
Dew Pt 70°F
Heat Index: 105°F
Wind from W

W 12 mph
Precip: 17%

Thu
7:00pm

Mostly Clear

94°F
Dew Pt 71°F
Heat Index: 101°F
Wind from W

W 10 mph
Precip: 14%

Thu
8:00pm

Mostly Clear

90°F
Dew Pt 71°F
Heat Index: 96°F
Wind from W

W 9 mph
Precip: 11%

Thu
9:00pm

Mostly Clear

87°F
Dew Pt 71°F
Heat Index: 93°F
Wind from W

W 8 mph
Precip: 9%

Thu
10:00pm

Mostly Clear

86°F
Dew Pt 71°F
Heat Index: 91°F
Wind from W

W 8 mph
Precip: 7%

Thu
11:00pm

Partly Cloudy

84°F
Dew Pt 71°F
Heat Index: 89°F
Wind from W

W 7 mph
Precip: 6%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 011120
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
720 AM EDT Wed Jul 1 2026

.WHAT HAS CHANGED...
No significant changes to the forecast.

&&

.KEY MESSAGES...

- Dangerous prolonged heat and humidity Wed through Sat with max 
  afternoon heat indices in the 98 to 112 degree range with 
  little relief at night. Peak of the heat Thu into Fri. 

- A cluster of showers and a few thunderstorms may impact parts
  of our region very late today into tonight. Activity likely 
  weakening with main severe weather risk to our northwest, but 
  cannot rule out a low risk across western MA/CT. 

- W/NW flow aloft may bring a low convective/severe weather risk
  Wed-Fri. However, limited forcing and cap may keep us mainly
  dry. Greatest risk for thunderstorms/severe weather potential
  might wait until Independence Day with the actual cold front.

&&

.DISCUSSION...
KEY MESSAGE 1...Dangerous prolonged heat and humidity Wed
through Sat with max afternoon heat indices in the 98 to 112
degree range with little relief at night. Peak of the heat Thu
into Fri.

High confidence forecast in dangerous prolonged heat and humidity 
Wed through Sat. Focused the headline messaging on the peak
threats rather than trying to slice the bologna too thin. Thus,
Extreme Heat Warnings for most of southern New England. Heat
Advisories for the Cape and Vineyard. The peak of this heat
looks to be in the Thursday-Friday time frame.

Heat indices will rise to between 98 and 108 degrees away from 
the south coast. The worst of the heat and humidity will likely 
be in the CT and Merrimack River valleys. High temperatures will
likely reach between 97 and 103 away from the south coast and
any very localized sea breezes. Heat indices will reach dangerous
levels in the 102 to 113 degree range. It will remain hot and 
humid for Independence Day as well. While it may be a few degrees
lower than Thu/Fri, dangerous heat and humidity may continue and
will be determined by the timing of a cold front. 

Not only will this be a dangerous prolonged period of heat, 
there will be little relief at night. Low temperatures will only
drop into the middle 70s in most locations and 75 to 80 degrees
in the urban centers. In fact, Boston may not drop below 80
degrees during the peak of the heat and humidity!

KEY MESSAGE 2...A cluster of showers and a few thunderstorms may
impact parts of our region very late today into tonight. Activity
likely weakening with main severe weather risk to our northwest, 
but cannot rule out a low risk across western MA/CT.

The other concern for late today and especially tonight is a 
shortwave that will be dropping southeast in northwest flow aloft 
around the developing ring of fire. Effective shear of 30-40 knots 
is favorable for this activity to work into our region...but 
instability will be rather marginal. So expect a cluster of 
weakening scattered showers and perhaps a few thunderstorms to 
impact portions of our region. The greatest risk is across western 
MA/CT. The overall severe weather threat is low given the limited 
instability in our region...but given northwest flow aloft and 
lingering momentum can not rule out a low probability for some 
severe weather in western MA/CT. However...currently thinking 
greatest risk is northwest of our region. 

KEY MESSAGE 3...W/NW flow aloft may bring a low convective/severe
weather risk Wed-Fri. However, limited forcing and cap may keep
us mainly dry. Greatest risk for thunderstorms/severe weather
potential might wait until Independence Day with the actual 
cold front.

Anomalous heat and humidity will result in rather high instability 
across our region Wed through Fri. In addition, a remnant EML 
in northwest flow aloft is present. If somehow a few thunderstorms
do develop, they could quickly become severe, even during the
overnight/morning hours. However, a lack of overall synoptic
forcing and a mid level cap should keep this risk low. This
potential will still need to watched. Greatest risk for 
convection and potentially some severe weather may wait until 
Independence Day when a cold front and stronger forcing arrives.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

12z TAF Update...

Today through Thursday...High confidence outside of any potential 
thunderstorms.

VFR conditions will dominate today through Thursday. Some minor
scattered shower activity may develop mid day around Boston. There
is the potential for a few strong thunderstorms especially this
afternoon and tonight. Timing/location of any thunderstorms 
though remain rather uncertain and might be more of a nowcast 
situation but look most plausible for western terminals. SW 
winds will generally gust 15 to 20 knots later today and again 
Thu...while parts of the Cape/Islands gust to 25 knots and 
perhaps briefly around 30 knots in the typically prone spots. 

KBOS Terminal...High confidence in TAF but will need to watch for a 
few thunderstorms later today and tonight.

KBDL Terminal...High confidence in TAF but will need to watch for a 
few more thunderstorms in the vicinity of the terminal later today 
and tonight. 

Outlook /Thursday Night through Sunday/...

Thursday Night through Friday: VFR. Breezy. 

Friday Night: VFR. 

Independence Day through Sunday: VFR. Slight chance SHRA,
slight chance TSRA.

&&

.MARINE...
Forecaster Confidence Levels...

Low - less than 30 percent. 
Moderate - 30 to 60 percent. 
High - greater than 60 percent.

Today through Thursday...High confidence. 

Bermuda high pressure will result in a persistent SW flow across our 
waters. SW winds will gust to 25 knots at times today through 
Thursday and long fetch will result in seas building to 3 to 6 feet 
across our southern waters. Therefore...we have continued small 
craft headlines for our southern waters into Thursday. 

Outlook /Thursday Night through Sunday/...

Thursday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. 

Friday: Winds less than 25 kt. Areas of seas approaching 5 ft. 

Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. 

Independence Day: Winds less than 25 kt. 

Saturday Night: Winds less than 25 kt. Slight chance of rain
showers, slight chance of thunderstorms. 

Sunday: Winds less than 25 kt. Slight chance of rain showers.

&&

.CLIMATE...
Record High Temperatures:

July 1:
KBOS: 98/1872
KBDL: 101/1964
KPVD: 97/1964
KORH: 94/1913

July 2: 
KBOS: 98/1963
KBDL: 99/1966
KPVD: 98/1941
KORH: 97/1901 

July 3: 
KBOS: 102/1911
KBDL: 102/1966
KPVD: 98/2002
KORH: 96/1911

July 4: 
KBOS: 104/1911 
KBDL: 99/1911
KPVD: 99/1919
KORH: 102/1911


Record High Minimum Temperatures:

July 1:
KBOS: 73/1958
KBDL: 73/1968
KPVD: 71/1968
KORH: 72/2018

July 2:
KBOS: 76/2002
KBDL: 73/2018
KPVD: 75/1941
KORH: 73/1963

July 3: 
KBOS: 80/2002
KBDL: 73/2018
KPVD: 78/2002
KORH: 72/2002

July 4: 
KBOS: 77/2002
KBDL: 74/2018
KPVD: 77/2002
KORH: 73/2018

July 5:
KBOS: 81/1999
KBDL: 77/1999
KPVD: 78/1999
KORH: 73/1999

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Extreme Heat Warning until 8 PM EDT Saturday for CTZ002>004.
     Air Quality Alert from 11 AM this morning to 11 PM EDT this 
     evening for CTZ002>004.
MA...Extreme Heat Warning until 8 PM EDT Saturday for MAZ002>021-
     026.
     Heat Advisory until 8 PM EDT Saturday for MAZ022-023.
RI...Extreme Heat Warning until 8 PM EDT Saturday for RIZ001>007.
     Air Quality Alert from 11 AM this morning to 11 PM EDT this 
     evening for RIZ001>008.
MARINE...Small Craft Advisory until 6 PM EDT Thursday for ANZ231>235-
     237.
     Small Craft Advisory until 11 PM EDT this evening for ANZ236.
     Small Craft Advisory until 1 AM EDT Friday for ANZ254>256.

&&

$$

DISCUSSION...Frank
AVIATION...Frank/KS
MARINE...Frank 
CLIMATE...FT

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