Lexington Weather

Current Conditions [‒] Current Conditions [+]

74.8°F Colder than last hour.

23.8°C

Muggy

Clear

Tonight: Lo 66 °F

Monday: Hi 89 °F

Dew Point: 65.7°F Increased 0.2°F since last hour .

Humidity: 73% Increased 3.0% since last hour.

Air Quality Index: 37

Good

(Fine Particles)

Barometer: 29.90 in S

1013 mb

Rain Rate: 0.00 in/hr

Rain Today: 0.00 in

Rain Saturday: 0.00 in

Visibility: 10 miles

Wind:

Now: Calm

Avg: Calm

Gusts: 0 mph

OTHER PERSONAL WEATHER STATIONS

REGIONAL CONDITIONS

NWS Weather Forecast -
Tonight, Monday, & Monday Night through Sunday

Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sun Aug 9, 2026 3:28pm EDT

Overview:

- Humidity briefly trends down tonight, but then rises again Monday afternoon. Above normal temperatures continue through Tuesday.

- Warmer and less humid Wednesday, with a strong cold front moving in early on Thursday bringing a risk for showers and a low risk for storms.

- Nice stretch of later-summer weather Friday into the weekend.

Tonight:

Clear

Lo 66 °F

Clear, with a low around 66. West wind 3 to 9 mph.

Monday:

Sunny

Hi 89 °F

Sunny, with a high near 89. Southwest wind 1 to 8 mph.

Monday Night:

Slight Chance Rain Showers then Partly Cloudy

Lo 69 °F

A slight chance of rain showers between 8pm and 9pm. Partly cloudy, with a low around 69. West wind around 8 mph. Chance of precipitation is 20%.

Tuesday:

Sunny

Hi 87 °F

Sunny, with a high near 87. West wind around 9 mph.

Tuesday Night:

Mostly Clear

Lo 62 °F

Mostly clear, with a low around 62. Northwest wind 3 to 8 mph.

Wednesday:

Sunny

Hi 86 °F

Sunny, with a high near 86. West wind around 6 mph.

Wednesday Night:

Partly Cloudy then Chance Rain Showers

Lo 65 °F

A chance of rain showers after 1am. Partly cloudy, with a low around 65. Southwest wind around 6 mph. Chance of precipitation is 40%.

Thursday:

Chance Rain Showers

Hi 85 °F

A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 85. West wind 3 to 10 mph. Chance of precipitation is 50%.

Thursday Night:

Chance Showers And T-Storms then Partly Cloudy

Lo 60 °F

Thursday Night: Chance Showers And Thunderstorms then Partly Cloudy

A chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 60. West wind 6 to 9 mph. Chance of precipitation is 40%.

Friday:

Sunny

Hi 80 °F

Sunny, with a high near 80. West wind 7 to 10 mph, with gusts as high as 21 mph.

Friday Night:

Mostly Clear

Lo 57 °F

Mostly clear, with a low around 57. Northwest wind 6 to 9 mph.

Saturday:

Sunny

Hi 81 °F

Sunny, with a high near 81. Northwest wind around 8 mph.

Saturday Night:

Mostly Clear

Lo 57 °F

Mostly clear, with a low around 57. Northwest wind around 6 mph.

Sunday:

Sunny

Hi 80 °F

Sunny, with a high near 80. West wind around 6 mph.

FULL FORECAST

NWS Hourly Forecast -
Tonight 11pm through Tue 10am

Issued by:
National Weather Service Boston / Norton, MA
Updated Sun Aug 9, 2026 3:28pm EDT

11:00pm

Clear

75°F
Dew Pt 61°F
Wind from W

W 5 mph
Precip: 0%

Mon
12:00am

Clear

74°F
Dew Pt 61°F
Wind from W

W 5 mph
Precip: 0%

Mon
1:00am

Clear

72°F
Dew Pt 61°F
Wind from W

W 3 mph
Precip: 0%

Mon
2:00am

Clear

71°F
Dew Pt 61°F
Wind from W

W 3 mph
Precip: 0%

Mon
3:00am

Clear

69°F
Dew Pt 60°F
Wind from W

W 3 mph
Precip: 0%

Mon
4:00am

Mostly Clear

68°F
Dew Pt 60°F
Wind from W

W 3 mph
Precip: 0%

Mon
5:00am

Mostly Clear

68°F
Dew Pt 59°F
Wind from W

W 3 mph
Precip: 0%

Mon
6:00am

Sunny

67°F
Dew Pt 59°F
Wind from W

W 2 mph
Precip: 0%

Mon
7:00am

Sunny

69°F
Dew Pt 60°F
Wind from W

W 2 mph
Precip: 0%

Mon
8:00am

Sunny

72°F
Dew Pt 62°F
Wind from NW

NW 1 mph
Precip: 0%

Mon
9:00am

Sunny

75°F
Dew Pt 63°F
Wind from SW

SW 2 mph
Precip: 0%

Mon
10:00am

Sunny

80°F
Dew Pt 63°F
Heat Index: 81°F
Wind from S

S 3 mph
Precip: 0%

Mon
11:00am

Mostly Sunny

83°F
Dew Pt 63°F
Heat Index: 84°F
Wind from SW

SW 6 mph
Precip: 0%

Mon
12:00pm

Mostly Sunny

85°F
Dew Pt 62°F
Heat Index: 86°F
Wind from SW

SW 6 mph
Precip: 0%

Mon
1:00pm

Sunny

87°F
Dew Pt 62°F
Wind from SW

SW 7 mph
Precip: 1%

Mon
2:00pm

Sunny

88°F
Dew Pt 62°F
Wind from SW

SW 8 mph
Precip: 2%

Mon
3:00pm

Mostly Sunny

89°F
Dew Pt 62°F
Wind from SW

SW 8 mph
Precip: 4%

Mon
4:00pm

Mostly Sunny

89°F
Dew Pt 63°F
Heat Index: 90°F
Wind from SW

SW 8 mph
Precip: 8%

Mon
5:00pm

Partly Sunny

88°F
Dew Pt 63°F
Heat Index: 89°F
Wind from SW

SW 8 mph
Precip: 12%

Mon
6:00pm

Partly Cloudy

87°F
Dew Pt 64°F
Heat Index: 88°F
Wind from SW

SW 8 mph
Precip: 11%

Mon
7:00pm

Mostly Cloudy

85°F
Dew Pt 65°F
Heat Index: 87°F
Wind from SW

SW 7 mph
Precip: 12%

Mon
8:00pm

Slight Chance Rain Showers

81°F
Dew Pt 65°F
Heat Index: 83°F
Wind from SW

SW 6 mph
Precip: 16%

Mon
9:00pm

Mostly Cloudy

79°F
Dew Pt 66°F
Wind from SW

SW 6 mph
Precip: 12%

Mon
10:00pm

Partly Cloudy

77°F
Dew Pt 66°F
Wind from SW

SW 6 mph
Precip: 4%

Mon
11:00pm

Partly Cloudy

76°F
Dew Pt 66°F
Wind from SW

SW 6 mph
Precip: 7%

Tue
12:00am

Partly Cloudy

75°F
Dew Pt 67°F
Wind from SW

SW 6 mph
Precip: 3%

Tue
1:00am

Mostly Clear

74°F
Dew Pt 66°F
Wind from W

W 6 mph
Precip: 0%

Tue
2:00am

Mostly Clear

74°F
Dew Pt 66°F
Wind from W

W 6 mph
Precip: 0%

Tue
3:00am

Mostly Clear

73°F
Dew Pt 66°F
Wind from W

W 6 mph
Precip: 0%

Tue
4:00am

Mostly Clear

71°F
Dew Pt 66°F
Wind from W

W 6 mph
Precip: 0%

Tue
5:00am

Mostly Clear

71°F
Dew Pt 65°F
Wind from W

W 6 mph
Precip: 0%

Tue
6:00am

Sunny

71°F
Dew Pt 65°F
Wind from W

W 7 mph
Precip: 0%

Tue
7:00am

Sunny

70°F
Dew Pt 65°F
Wind from W

W 7 mph
Precip: 0%

Tue
8:00am

Sunny

75°F
Dew Pt 65°F
Wind from W

W 7 mph
Precip: 0%

Tue
9:00am

Sunny

77°F
Dew Pt 64°F
Wind from W

W 8 mph
Precip: 0%

Tue
10:00am

Sunny

79°F
Dew Pt 64°F
Wind from W

W 9 mph
Precip: 0%

VIEW ON NWS WEB SITE

FORECAST DISCUSSION

Area Forecast Discussion
for Boston / Norton, MA

        
000
FXUS61 KBOX 092329
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
729 PM EDT Sun Aug 9 2026

.WHAT HAS CHANGED...
Forecast remains on track.

&&

.KEY MESSAGES...

- Humidity briefly trends down tonight, but then rises again
  Monday afternoon. Above normal temperatures continue through
  Tuesday.

- Warmer and less humid Wednesday, with a strong cold front
  moving in early on Thursday bringing a risk for showers and 
  a low risk for storms.

- Nice stretch of later-summer weather Friday into the weekend.

&&

.DISCUSSION...
KEY MESSAGE 1...Humidity briefly trends down tonight, but then rises 
again Monday afternoon. Above normal temperatures continue through 
Tuesday.

Expecting mainly rain-free conditions for this portion of the 
forecast. The exception should be Monday afternoon into the evening, 
when a round of diurnal showers and thunderstorms will be possible.

Humidity drops later tonight behind a weak cold front. This front 
should not go far, and return as a warm front Monday afternoon into 
the evening. Dew points increase again just to the south of this
front. A passing cold pool across northern New England should
help to generate CAPE values of 750-1,250 J/kg by late Monday
afternoon. The greatest risk for any thunderstorms likely
remains west of our region.

Once again, this warm front moves back south as a cold front
Monday night into Tuesday. Not looking humid enough to keep a
mention of showers in the forecast, especially that early in 
the day when this front should pass by. Humidity starts to fall
once more Monday night, but really get into the comfortable
range Tuesday afternoon and night.

KEY MESSAGE 2...Warmer and less humid Wednesday, with a strong 
cold front moving in early on Thursday bringing a risk for
showers and a low risk for storms.

Summer warmth continues into Wednesday, but with a substantial 
decrease in humidity levels (e.g. aftn dewpoints in the upper 
50s to mid 60s) with westerly non-convergent flow offering dry 
weather. Partly sunny with highs in the mid to upper 80s and 
lows in the lower to mid 60s. 

A rather strong mid/upper trough and surface cold front moves
through Southern New England on Thursday. This frontal system
ushers in a true substantial change in airmass. Ordinarily, that 
would point to an active day, but the timing is the biggest
mitigating factor, as the front looks to reach the eastern MA
coast by early afternoon per loose global model consensus. Thus 
current expectation is for minimal to weak diurnal instability 
and an attendant low risk for thunderstorms, but if the front 
ends up slower than current thinking then the risk for storms 
would increase to go along with the risk for strong storms. 
Partly to mostly cloudy skies with highs in the lower 80s, with 
dewpoints falling through the afternoon and evening into low-mid
50s post- frontal, and lows in the 50s to around 60. 

KEY MESSAGE 3...Nice stretch of later-summer weather Friday 
into the weekend.

Main story for Friday into the weekend is a much cooler and
drier airmass that entrenches itself over the Northeast. Cool
advection brings 850 mb temps down to around +8 to +10C,
supportive of highs in the 70s to lower 80s with mostly 
sunny/partly cloudy skies and dewpoints falling into the 40s. 
Overall a nice stretch of late- summer weather if slightly 
cooler than normal for mid August. Next chance for showers or 
storms could arrive by late Sunday or Monday but the timing is 
still a question mark.

&&

.AVIATION /00Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...

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

00z TAF Update: 

Tonight: High confidence. 

VFR. Hazy skies due to transported smoke well aloft from
wildfires in eastern Washington was handled with BKN250 decks 
in TAFs through overnight, but no reductions to visbys are 
expected. Westerly flow at ACK should mitigate mist/fog 
development. W/WNW winds around 10 kt decrease to light NW by 
daybreak. 

Monday: High confidence overall but moderate on timing TSRA and
seabreezes. 

Mainly VFR; hazy-looking skies from smoke should clear out but
could return again by late afternoon. TSRA looks to develop late
in the day, starting as soon as 20-21z at BDL and ORH, then move
E/ESE through 02z, and these could be strong with brf IFR 
visbys and strong winds. Indicated VCTS for BDL/ORH as these 
two TAF sites have best shot at TSRA with PROB30 at PVD. Have 
left out of remaining TAF sites due to low confidence. Light NW
winds flip to SW around 5-10 kt; BOS looks to seabreeze to an
ESE direction around 5-10 kt, but it could be short-lived than 
a typical seabreeze with SW winds around 10 kt shown by 21z. 

Monday Night: High confidence. 

Outside of weakening TSRA through 03z, VFR prevails. SW winds
shift to W around 5-10 kt after TSRA ends/moves offshore. 

KBOS Terminal...Moderate confidence in TAF. BKN250 for hazy 
conditions aloft from WA wildfire smoke. VFR prevails, seabreeze
tomorrow around 15z but end timing to SW could be shorter than a
typical seabreeze. SHRA/TSRA possible after 23z Mon but too 
low- confidence to include in TAF.

KBDL Terminal...Moderate confidence in TAF. BKN250 for hazy
conditons aloft from WA wildfire smoke. VFR prevails, though
better shot at TSRA after 20z. Storms could be strong with gusty
winds and brief IFR visbys. 

Outlook /Tuesday through Friday/...

Tuesday through Wednesday: VFR. 

Wednesday Night: VFR. Chance SHRA, slight chance TSRA.

Thursday: VFR. Breezy. Chance SHRA, slight chance TSRA.

Thursday Night: VFR. 

Friday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Monday Night... High Confidence.

Winds briefly turn WNW this evening with a weak cold frontal  
passage before returning to SW by late Monday morning. Local sea
breezes along the east coast of MA. Relatively light seas across
the waters through Monday Night.

Outlook /Tuesday through Friday/...

Tuesday through Wednesday: Winds less than 25 kt. 

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

Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers, slight chance of thunderstorms. 

Thursday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Slight chance of rain showers. 

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.

&&

$$

DISCUSSION...Belk/Loconto
AVIATION...Belk/Loconto
MARINE...Belk/Loconto

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