Lexington Weather
Lexington, Massachusetts, USA
- Partly cloudy
-
79.7°F / 26.5°C
-
53.2°F
-
40%
- Calm, 10-min avg: Calm, gust: 1 mph
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
79.7°F
26.5°C
Warm
Partly cloudy
This Afternoon: Hi 83 °F
Tonight: Lo 62 °F
Dew Point:
53.2°F
Humidity:
40%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Sunday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 1 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
This Afternoon,
Tonight,
&
Tuesday
through
Sunday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Mon Jul 20, 2026 2:30pm EDT
Overview:
- Seasonable summer weather today with temperatures in the 70s to mid 80s, with seabreezes near the coasts.
- Active weather Tuesday and Wednesday. Potential for hazardous marine conditions, high surf, soaking downpours and a limited risk for severe weather.
- Drying out late-week with a return to more seasonable temperatures and lower humidity levels into next weekend.
This Afternoon:
Sunny
Hi 83 °F
Sunny, with a high near 83. Southwest wind around 6 mph.
Tonight:
Partly Cloudy
Lo 62 °F
Partly cloudy, with a low around 62. South wind around 7 mph.
Tuesday:
Mostly Cloudy then Chance Showers And T-Storms
Hi 82 °F
A slight chance of rain showers between 2pm and 5pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 82. South wind 5 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Tuesday Night:
Chance Showers And T-Storms then Showers And T-Storms
Lo 67 °F
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Cloudy, with a low around 67. South wind 8 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Wednesday:
Chance Showers And T-Storms
Hi 84 °F
A chance of showers and thunderstorms before 1pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 84. Southwest wind 8 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.
Wednesday Night:
Chance Showers And T-Storms then Partly Cloudy
Lo 62 °F
A chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 62. West wind 5 to 10 mph. Chance of precipitation is 50%.
Thursday:
Sunny
Hi 81 °F
Sunny, with a high near 81. Northwest wind around 8 mph.
Thursday Night:
Mostly Clear
Lo 60 °F
Mostly clear, with a low around 60. Northwest wind 2 to 7 mph.
Friday:
Sunny
Hi 80 °F
Sunny, with a high near 80. Northeast wind 2 to 7 mph.
Friday Night:
Mostly Clear
Lo 62 °F
Mostly clear, with a low around 62. South wind 2 to 7 mph.
Saturday:
Sunny
Hi 82 °F
Sunny, with a high near 82. Northeast wind 1 to 7 mph.
Saturday Night:
Mostly Clear
Lo 64 °F
Mostly clear, with a low around 64. South wind 2 to 7 mph.
Sunday:
Mostly Sunny
Hi 85 °F
Mostly sunny, with a high near 85. South wind 2 to 7 mph.
Sunday Night:
Partly Cloudy
Lo 66 °F
Partly cloudy, with a low around 66. South wind around 7 mph.
NWS Hourly Forecast -
Today 3pm through Wed 2am
Issued by:
National Weather Service Boston / Norton, MA
Updated Mon Jul 20, 2026 2:30pm EDT
3:00pm
Dew Pt 53°F
W 6 mphPrecip: 0%
4:00pm
Dew Pt 53°F
W 6 mphPrecip: 0%
5:00pm
Dew Pt 53°F
SW 6 mphPrecip: 0%
6:00pm
Dew Pt 53°F
SW 6 mphPrecip: 0%
7:00pm
Dew Pt 54°F
SW 7 mphPrecip: 0%
8:00pm
Dew Pt 56°F
S 7 mphPrecip: 0%
9:00pm
Dew Pt 56°F
S 7 mphPrecip: 0%
10:00pm
Dew Pt 56°F
S 7 mphPrecip: 0%
11:00pm
Dew Pt 55°F
S 7 mphPrecip: 0%
12:00am
Dew Pt 55°F
S 6 mphPrecip: 0%
1:00am
Dew Pt 56°F
S 6 mphPrecip: 0%
2:00am
Dew Pt 56°F
S 5 mphPrecip: 0%
3:00am
Dew Pt 56°F
S 5 mphPrecip: 0%
4:00am
Dew Pt 57°F
S 5 mphPrecip: 0%
5:00am
Dew Pt 58°F
S 5 mphPrecip: 0%
6:00am
Dew Pt 59°F
S 5 mphPrecip: 0%
7:00am
Dew Pt 61°F
S 6 mphPrecip: 0%
8:00am
Dew Pt 63°F
S 6 mphPrecip: 0%
9:00am
Dew Pt 63°F
S 8 mphPrecip: 0%
10:00am
Dew Pt 63°F
S 9 mphPrecip: 0%
11:00am
Dew Pt 62°F
S 9 mphPrecip: 0%
12:00pm
Dew Pt 61°F
S 10 mphPrecip: 0%
1:00pm
Dew Pt 61°F
Heat Index: 81°F
S 12 mphPrecip: 1%
2:00pm
Dew Pt 60°F
Heat Index: 82°F
S 12 mphPrecip: 18%
3:00pm
Dew Pt 61°F
Heat Index: 81°F
S 12 mphPrecip: 21%
Rain: 0.01 in
4:00pm
Dew Pt 62°F
Heat Index: 82°F
S 12 mphPrecip: 24%
Rain: 0.02 in
5:00pm
Dew Pt 63°F
S 12 mphPrecip: 27%
Rain: 0.05 in
6:00pm
Dew Pt 65°F
S 12 mphPrecip: 45%
Rain: 0.09 in
7:00pm
Dew Pt 66°F
S 10 mphPrecip: 62%
Rain: 0.13 in
8:00pm
Dew Pt 68°F
SE 9 mphPrecip: 80%
Rain: 0.23 in
9:00pm
Dew Pt 69°F
SE 9 mphPrecip: 85%
Rain: 0.25 in
10:00pm
Dew Pt 70°F
S 8 mphPrecip: 90%
Rain: 0.39 in
11:00pm
Dew Pt 71°F
S 8 mphPrecip: 95%
Rain: 0.38 in
12:00am
Dew Pt 71°F
S 8 mphPrecip: 91%
Rain: 0.23 in
1:00am
Dew Pt 70°F
S 8 mphPrecip: 86%
Rain: 0.01 in
2:00am
Dew Pt 70°F
S 8 mphPrecip: 60%
Rain: 0.01 in
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 201741
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
141 PM EDT Mon Jul 20 2026
.WHAT HAS CHANGED...
Gale Watch issued for Tuesday afternoon through Wednesday early
evening.
&&
.KEY MESSAGES...
- Seasonable summer weather today with temperatures in the 70s
to mid 80s, with seabreezes near the coasts.
- Active weather Tuesday and Wednesday. Potential for hazardous
marine conditions, high surf, soaking downpours and a limited
risk for severe weather.
- Drying out late-week with a return to more seasonable
temperatures and lower humidity levels into next weekend.
&&
.DISCUSSION...
KEY MESSAGE 1...Seasonable summer weather today with temperatures in
the 70s to mid 80s, with seabreezes near the coasts.
Another great day of pleasant summer weather to open the
workweek. High pressure near vicinity of Cleveland OH builds
south, and brings a modest WSW to SW wind later in the day.
Local seabreezes still look to develop, but full sun with highs
in the upper 70s to mid 80s. A touch cooler along the coasts
with the seabreezes. Clear skies continue tonight but we'll be
starting to increase moist advection. There could be some patchy
mist or low clouds in interior portions of Southern New England
but probably not much impact.
KEY MESSAGE 2...Active weather Tuesday and Wednesday. Potential for
hazardous marine conditions, high surf, soaking downpours and a
limited risk for severe weather.
As the aforementioned high pressure cell moves offshore, in its
wake is an approaching frontal system over the Great Lakes
region with rather strong mid-upper level winds accompanying it.
Besides also leading to a tightening southerly pressure
gradient, a southerly 925-850 mb jet upwards of 60 kt will
permit strong moist advection and high IVT as PWATs rise to
2.25" along the system's cold front/frontal occlusion Tue
night/Wed. Several potential issues to Southern New England
Tuesday into Wednesday. Ranked in order of highest to lowest
confidence, these range from hazardous marine conditions/high
surf, another round of soaking downpours, and a more limited
risk for strong/severe thunderstorms potentially into the
overnight hours.
See the Marine portion for more details. Gale Watches have now
been hoisted on most waters starting Tuesday afternoon through
Wednesday early evening; multi-model-ensemble 34+ kt wind probs
remain in the 50-75% range in the Gale Watch area, highest the
further east/offshore one goes. The issue is on mixing in the
southwesterly warm advection pattern, which those coarser-res
ensembles can struggle to resolve, but potential exists for
parts of or all of the Watch to see gusts into gale force range.
Although they're mostly wind waves in a southerly fetch, waves
build to upwards of 12 ft and while not a beach day by any
stretch of the imagination, the potential exists for high surf
and later shifts will need to consider high surf or rip current
headlines. Less common to see gale watches in the summer
months, so hopefully getting the Watch out now conveys to
mariners that conditions could turn hazardous especially Tuesday
night and into Wednesday when factoring in the winds and
building rough seas.
Showers and thunderstorms begin to increase Tuesday afternoon,
and especially late in the day and into the Wednesday morning as
a combo of rising dewpoints and increasing upper support from
being placed in the poleward exit region of a 70-kt 500 mb
jetstreak provides additional upper support. Although severe
weather potential looks quite a bit greater well to our west,
increasing MUCAPEs and K- indices into the Tue overnight support
a risk for embedded stronger storms. Given the lower-level
winds improve overnight, some risk for straight line wind damage
and/or a brief spin-up are possible, but would hinge on
mustering enough 0-3 km CAPE. Wednesday might harbor a better
chance at stronger daytime storms as the front will have moved
offshore allowing for greater destabilization, and we'd be
placed under the upper trough with still favorable mid/upper
windfields.
In terms of rainfall, it looks like areas along the southern CT,
south coast and the Cape and Islands stand to see the most rain, at
the expense of interior Southern New England. Ensemble 24-hr QPF
probs paint moderately high (40-70%) probs of rain totals AOA 1 inch
along the southern/southeast coast, and lower (< 40%) to the north
and west. These areas have been getting quite a bit of rain lately,
especially out over Cape Cod. But high FFG owing to the sandy
soil could limit flooding. If we do get persistent downpours in
some of our RI/southeast MA larger cities along a stalling
frontal zone, then the risk would increase but this is
uncertain.
KEY MESSAGE 3...Drying out late-week with a return to more
seasonable temperatures and lower humidity levels into next weekend.
Cold front stalls well offshore by Thurs, with an expansive high
pressure across the Great Lakes ridging into the area late this week
into the weekend. Temperature profiles are pretty cool for late
July, at around +6 to +10C, but hard to get too cool with the sun
angle being as high as it is. Thus expect seasonable temperatures,
low humidity and dry weather late this week right through most of
the weekend. Really not until Sunday when we get into a southerly
return flow and with that comes increasing humidity levels.
&&
.AVIATION /18Z MONDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAF Update:
Through Tonight: Moderate confidence.
Mainly VFR; Sea breezes along the south shore and north coast,
but in-and-out around Boston Harbor. Chances for fog increase
more during the early morning in interior Southern New England
and mentioned MVFR mist as a starting point. Winds become light
SW.
Tuesday: Moderate confidence.
General deterioration to MVFR-IFR ceilings by afternoon, with
risk for showers and possible storms after 18z. Better potential
for storms Tue night. Winds become SE to S and increase to
10-15 kt with gusts 20-25 kt.
KBOS Terminal...Moderate confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Tuesday Night through Saturday/...
Wednesday: Mainly VFR, with local MVFR possible. Windy with
gusts up to 35 kt. Chance SHRA, chance TSRA.
Wednesday Night: VFR. Windy with local gusts up to 30 kt.
Chance SHRA.
Thursday through Saturday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tranquil boating conditions are expected today and into tonight.
Winds turn southeast near the coasts around 10 kt this
afternoon; otherwise winds to turn SW around 10 kt, to around
10-20 kt overnight. Seas around 3 ft or less, but build to
around 3-4 ft tonight.
Gale Watches have been posted for most of the eastern and
southern waters for Tue afternoon through Wed evening.
Strengthening southerly winds Tuesday but more into the SCA
range during the daytime hours. Mariners will need to be
prepared for onset of gale-force gusts for Tue night into the
first part of Wed. Seas will build and become increasingly
rough, especially by Tue night, and could reach upwards of 12
ft on the southern outer offshore waters. Risk for
thunderstorms, too. The combo of all of these means dangerous
marine conditions are possible.
Outlook /Tuesday Night through Saturday/...
Wednesday: Moderate risk for gale force winds with gusts up to
40 kt. Rough seas up to 11 ft. Chance of rain showers, chance
of thunderstorms.
Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Rough seas up to 11 ft. Chance of rain
showers.
Thursday: Winds less than 25 kt. Areas of rough seas. Chance of
rain showers.
Thursday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers.
Friday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
Friday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers.
Saturday: Winds less than 25 kt. Areas of seas approaching
5 ft.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Gale Watch from Tuesday afternoon through Wednesday evening
for ANZ231>235-250-254>256-280>283.
&&
$$
DISCUSSION...Loconto
AVIATION...McMinn
MARINE...Loconto
Radar [‒] Radar [+]
Radar images courtesy Weather Underground / Intellicast.
Satellite [‒] Satellite [+]
Satellite images courtesy Weather Underground / Intellicast.
-
GOES
East
-
Weather
Underground
Visible -
Weather
Underground
Infrared -
Weather Underground
Wundermap
(opens in new tab)
Tap Click image to go to NESDIS
Tap Click image to go to Weather Underground
Tap Click image to go to Weather Underground
UV Forecast [‒] UV Forecast [+]
UV Index forecast from the Environmental Protection Agency
UV Index forecast high for today: 8 Very High
Current (Estimated): 6 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:
0.00 in
Sunday:
2.71 in
July:
14.53 in
2026
Daily Extremes [‒] Daily Extremes [+]
2:15pm
81.7°F
High today:
6:34am
57.6°F
Low today:
4:43pm
77.2°F
High Sunday:
11:56pm
64.9°F
Low Sunday:
11:11am
60.1°F
High dew pt today:
12:41am
69.6°F
High dew pt Sunday:
2:16pm
81.7°F
High heat index today:
12:53pm
8 mph
Wind gust today:
4:01am
12 mph
Wind gust Sunday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
4:53am
Sunrise:
5:26am
Sunset:
8:17pm
Twilight ends:
8:50pm
Daylight length:
14 hours 51 minutes
Phase:
Waxing Crescent (43%)
Moon rise:
12:38pm
Moon set:
11:23pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
© 2026, LexMAWeather
@LexMAWeather@toot.community
@LexMAWeather.toot.community.ap.brid.gy
Site development based on the USA and Meteobridge templates from
Saratoga-Weather.org.
Additional code adapted from
SE Lincoln Weather Scripts.
Weather data and images courtesy the National Weather Service, Environmental Protection Agency, AirNow, Weather Underground / Intellicast, Vaisala Xweather (formerly AerisWeather), earth.nullschool.net, Windy.com, and Leaflet/OpenStreetMap