Lexington Weather
Lexington, Massachusetts, USA
- Few Clouds
-
79.2°F / 26.2°C
-
61.5°F
-
55%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
79.2°F
26.2°C
Muggy
Few Clouds
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Saturday: 0.22 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Today,
Tonight,
&
Monday
through
Saturday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sun Jul 5, 2026 7:06am EDT
Overview:
- Cooler/seasonable temps return today with highs mainly in the upper 70s to the middle 80s. Mainly dry today outside a few showers across western MA/CT and near the south coast.
- Confidence growing in the potential for bands of heavy rainfall & even the risk for localized flash flooding late tonight into Tue. Greatest risk for this right now is in northern CT...where a Flood Watch has been issued.
- Summer warmth & humidity return for the latter half of the week. A few showers and thunderstorms possible by Fri-Sat.
Today:
Partly Sunny
Hi 83 °F
Partly sunny, with a high near 83. East wind 3 to 8 mph.
Tonight:
Mostly Cloudy then Slight Chance Rain Showers
Lo 63 °F
A slight chance of rain showers after midnight. Mostly cloudy, with a low around 63. Southeast wind 2 to 8 mph. Chance of precipitation is 20%.
Monday:
Chance Rain Showers
Hi 76 °F
A chance of rain showers. Cloudy, with a high near 76. Southeast wind 5 to 10 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Monday Night:
Rain Showers Likely
Lo 62 °F
Rain showers likely before 1am, then rain showers likely and patchy fog. Mostly cloudy, with a low around 62. East wind around 13 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday:
Rain Showers Likely
Hi 71 °F
Rain showers likely and patchy fog. Mostly cloudy, with a high near 71. Northeast wind 9 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.
Tuesday Night:
Chance Rain Showers
Lo 60 °F
A chance of rain showers. Mostly cloudy, with a low around 60. Northeast wind 5 to 9 mph. Chance of precipitation is 50%.
Wednesday:
Slight Chance Rain Showers then Partly Sunny
Hi 79 °F
A slight chance of rain showers before 8am. Partly sunny, with a high near 79. Northeast wind around 6 mph.
Wednesday Night:
Partly Cloudy
Lo 61 °F
Partly cloudy, with a low around 61. South wind around 5 mph.
Thursday:
Sunny
Hi 87 °F
Sunny, with a high near 87. Southwest wind 3 to 9 mph.
Thursday Night:
Slight Chance Rain Showers
Lo 67 °F
A slight chance of rain showers after 9pm. Partly cloudy, with a low around 67. Southwest wind 6 to 9 mph.
Friday:
Chance Rain Showers then Chance Showers And T-Storms
Hi 88 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 88. West wind 6 to 9 mph. Chance of precipitation is 50%.
Friday Night:
Chance Showers And T-Storms
Lo 63 °F
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 10pm, then a slight chance of showers and thunderstorms between 10pm and 2am. Mostly cloudy, with a low around 63. Northwest wind 3 to 7 mph. Chance of precipitation is 50%.
Saturday:
Chance Rain Showers
Hi 83 °F
A chance of rain showers between 8am and 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. Northeast wind around 7 mph. Chance of precipitation is 40%.
Saturday Night:
Chance Showers And T-Storms
Lo 61 °F
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. West wind around 5 mph.
NWS Hourly Forecast -
Today 12pm through Mon 11pm
Issued by:
National Weather Service Boston / Norton, MA
Updated Sun Jul 5, 2026 7:06am EDT
12:00pm
Dew Pt 61°F
Heat Index: 82°F
E 6 mphPrecip: 1%
1:00pm
Dew Pt 61°F
Heat Index: 83°F
SE 6 mphPrecip: 2%
2:00pm
Dew Pt 61°F
Heat Index: 83°F
SE 7 mphPrecip: 2%
3:00pm
Dew Pt 61°F
Heat Index: 83°F
SE 7 mphPrecip: 3%
4:00pm
Dew Pt 61°F
Heat Index: 82°F
SE 8 mphPrecip: 4%
5:00pm
Dew Pt 60°F
Heat Index: 81°F
SE 8 mphPrecip: 5%
6:00pm
Dew Pt 60°F
SE 8 mphPrecip: 8%
7:00pm
Dew Pt 60°F
SE 8 mphPrecip: 10%
8:00pm
Dew Pt 60°F
SE 8 mphPrecip: 13%
9:00pm
Dew Pt 61°F
SE 7 mphPrecip: 13%
10:00pm
Dew Pt 61°F
SE 6 mphPrecip: 12%
11:00pm
Dew Pt 61°F
S 5 mphPrecip: 12%
12:00am
Dew Pt 61°F
S 3 mphPrecip: 15%
1:00am
Dew Pt 61°F
S 3 mphPrecip: 18%
2:00am
Dew Pt 61°F
S 2 mphPrecip: 21%
3:00am
Dew Pt 61°F
SE 2 mphPrecip: 21%
4:00am
Dew Pt 61°F
SE 3 mphPrecip: 20%
5:00am
Dew Pt 61°F
E 3 mphPrecip: 20%
6:00am
Dew Pt 61°F
E 5 mphPrecip: 22%
7:00am
Dew Pt 61°F
SE 5 mphPrecip: 24%
8:00am
Dew Pt 62°F
SE 6 mphPrecip: 26%
9:00am
Dew Pt 62°F
SE 7 mphPrecip: 24%
10:00am
Dew Pt 62°F
SE 9 mphPrecip: 22%
11:00am
Dew Pt 62°F
SE 10 mphPrecip: 20%
12:00pm
Dew Pt 61°F
SE 10 mphPrecip: 20%
1:00pm
Dew Pt 61°F
E 10 mphPrecip: 20%
2:00pm
Dew Pt 61°F
E 10 mphPrecip: 20%
3:00pm
Dew Pt 61°F
E 10 mphPrecip: 28%
Rain: 0.01 in
4:00pm
Dew Pt 61°F
E 10 mphPrecip: 26%
Rain: 0.01 in
5:00pm
Dew Pt 61°F
E 10 mphPrecip: 32%
Rain: 0.01 in
6:00pm
Dew Pt 60°F
E 10 mphPrecip: 39%
Rain: 0.01 in
7:00pm
Dew Pt 60°F
E 12 mphPrecip: 45%
Rain: 0.01 in
8:00pm
Dew Pt 60°F
E 12 mphPrecip: 52%
Rain: 0.04 in
9:00pm
Dew Pt 61°F
E 12 mphPrecip: 53%
Rain: 0.04 in
10:00pm
Dew Pt 61°F
E 10 mphPrecip: 55%
Rain: 0.05 in
11:00pm
Dew Pt 61°F
E 10 mphPrecip: 56%
Rain: 0.05 in
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 050849
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
449 AM EDT Sun Jul 5 2026
.WHAT HAS CHANGED...
A Flood Watch has been issued for Connecticut.
&&
.KEY MESSAGES...
- Cooler/seasonable temps return today with highs mainly in the
upper 70s to the middle 80s. Mainly dry today outside a few
showers across western MA/CT and near the south coast.
- Confidence growing in the potential for bands of heavy rainfall
& even the risk for localized flash flooding late tonight into Tue.
Greatest risk for this right now is in northern CT...where a
Flood Watch has been issued.
- Summer warmth & humidity return for the latter half of the week.
A few showers and thunderstorms possible by Fri-Sat.
&&
.DISCUSSION...
KEY MESSAGE 1...Cooler/seasonable temps return today with highs
mainly in the upper 70s to the middle 80s. Mainly dry today outside
a few showers across western MA/CT and near the south coast.
The upper level ridge has finally broken down across the
region...which will bring a return to cooler/seasonable temperatures
today. We do expect a scattered to broken deck of mid-level
cloudiness across the region as a weak surface boundary slowly lifts
north across the region. Dry weather will dominate today...except
for a few showers across western MA/CT and near the south coast
given their proximity to deeper moisture and forcing.
KEY MESSAGE 2...Confidence growing in the potential for bands of
heavy rainfall & even the risk for localized flash flooding late
tonight into Tue. Greatest risk for this right now is in northern
CT...where a Flood Watch has been issued.
Confidence is growing in the potential for bands of heavy rainfall
and even the risk for localized flash flooding late tonight into
Tue. This is a rather complex forecast in trying to determine the
location and greatest risk for torrential rainfall/localized flash
flooding which we will discuss more below.
Weak high pressure over eastern Canada will help to focus a shallow
boundary at the surface. Just above that a modest ESE low level of 25
to 35 knots at 925 mb will impinge on this surface boundary. This
will combined with Pwats of 1.5 to 2+ inches and set the stage for
bands of heavy rainfall late tonight into Tue with some embedded
thunder possible. We are essentially combining synoptic scale
forcing with summertime moisture and instability...which is a good
setup of for bands of torrential rainfall and potential for
localized flash flooding. The models do quite a good job these days
in indicating the potential for torrential rainfall/localized flash
flooding. However...they often struggle to depict the location given
various mesoscale parameters in play. Currently, the models seem to
be favoring our southwest zones where the best moisture and Pwat
plume are located.
Given the above...we have gone ahead and issued a Flood Watch for
our CT zones. This is for a widespread 1-3 inches of rainfall...But
the potential for localized narrow bands of 4-6 inches of rain
inside 6 hours. If this were to occur...the potential would exist
for both urban and small stream flash flooding late tonight into
Tue. Later shifts may need to expand the Flood Watch further north
and east...But we felt this was a good starting point for now. It is
also possible that the heavy rain/flood threat remains to our
southwest...But either way felt a Flood Watch for CT was reasonable
to just highlight the potential.
KEY MESSAGE 3...Summer warmth & humidity return for the latter half
of the week.
Drier weather works into the region by Wed as the shortwave trough
departs. Westerly flow will develop by late in the week bringing
typical summertime warmth and humidity back into the region...But
fortunately not the extreme heat we have dealt with the last few
days. There will also be the risk for a few showers and
thunderstorms by Fri-Sat as the next shortwave works into the
region.
&&
.AVIATION /08Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
06z TAF Update...
Today through Monday...Moderate confidence.
Mainly VFR today but some lower MVFR conditions possible at times
today in a few showers across western MA/CT and near the south
coast. MVFR conditions become more widespread across western MA/CT
later tonight and Mon along with periods of showers with locally
heavy rainfall.
Light ESE winds today and tonight becoming E at 6 to 13 knots on
Mon.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Monday Night through Thursday/...
Monday Night: Mainly MVFR, with areas IFR possible. Breezy.
SHRA, slight chance TSRA, patchy BR.
Tuesday: MVFR/IFR conditions possible. Windy with local gusts
up to 30 kt. Chance SHRA, slight chance TSRA, patchy BR.
Tuesday Night: Mainly VFR, with areas MVFR possible. Breezy.
Chance SHRA.
Wednesday through Wednesday Night: VFR.
Thursday: VFR. Breezy.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today and tonight...High confidence.
High pressure over eastern Canada combined with a wave of low
pressure passing to our south will result in ESE winds today and
tonight...But the winds/seas should remain below small craft
advisory thresholds.
Monday...Moderate confidence.
Wave of low pressure passing to our south should result in E wind
gusts increasing to around 25+ knots across our southern waters.
Later shifts will likely need to issue small craft advisories for
our southern waters and we may need to expand them further north
Monday night.
Outlook /Monday Night through Thursday/...
Monday Night: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Local rough seas. Rain showers, slight
chance of thunderstorms, patchy fog.
Tuesday: Moderate risk for Small Craft Advisory winds with
local gusts up to 30 kt. Rough seas up to 10 ft. Rain showers
likely, slight chance of thunderstorms, patchy fog.
Tuesday Night: Winds less than 25 kt. Rough seas up to 10 ft.
Chance of rain showers, slight chance of thunderstorms.
Wednesday: Winds less than 25 kt. Rough seas up to 9 ft. Slight
chance of rain showers.
Wednesday Night through Thursday: Winds less than 25 kt. Seas
up to 5 ft.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flood Watch from late tonight through Tuesday afternoon for
CTZ002>004.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Frank
AVIATION...Frank
MARINE...Frank
Radar [‒] Radar [+]
Radar images courtesy Weather Underground / Intellicast.
Satellite [‒] Satellite [+]
Satellite images courtesy Weather Underground / Intellicast.
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UV Forecast [‒] UV Forecast [+]
UV Index forecast from the Environmental Protection Agency
UV Index forecast high for today: 7 High
Current (Estimated): 7 High
Precipitation [‒] Precipitation [+]
Note: Rain measured automatically by weather station. Rain totals do not necessarily include melted frozen precipitation.
For more accurate, manually measured rain data, see the Local Precip Data page.
0.00 in
Rain Rate (/hr):
0.00 in
Rain Last 60 min:
0.00 in
Rain Today:
0.22 in
Saturday:
0.22 in
July:
12.04 in
2026
Daily Extremes [‒] Daily Extremes [+]
12:10pm
80.1°F
High today:
6:01am
65.7°F
Low today:
12:11pm
90.3°F
High Saturday:
11:12pm
72.0°F
Low Saturday:
12:00am
70.0°F
High dew pt today:
2:08pm
73.9°F
High dew pt Saturday:
12:10pm
81.0°F
High heat index today:
2:08pm
98.7°F
High heat index Saturday:
11:53am
5 mph
Wind gust today:
10:41am
8 mph
Wind gust Saturday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
4:40am
Sunrise:
5:14am
Sunset:
8:25pm
Twilight ends:
8:59pm
Daylight length:
15 hours 11 minutes
Phase:
Waning Gibbous (72%)
Moon set:
10:44am
Moon rise:
11:24pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
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