Lexington Weather
Lexington, Massachusetts, USA
- Mostly cloudy
-
55.8°F / 13.2°C
-
37.9°F
-
51%
-
SW 2 mph, 10-min avg: 2 mph, gust: 12 mph
-
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
55.8°F
13.2°C
Cool
Mostly cloudy
This Afternoon: Hi 55 °F
Tonight: Lo 41 °F
Dew Point:
37.9°F
Humidity:
51%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Thursday: 0.00 in
Visibility: 10 miles
Wind:
Now: 2 mph
Avg: 2 mph
Gusts: 12 mph
Expected Snow [‒] Expected Snow [+]
72-Hour Snowfall Forecast
Trace of snow expected in Lexington.
Forecast [‒] Forecast [+]
NWS Weather Forecast -
This Afternoon,
Tonight,
&
Saturday
through
Thursday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Fri Mar 20, 2026 1:08pm EDT
This Afternoon:
Slight Chance Light Rain
Hi 55 °F
A slight chance of rain after 4pm. Partly sunny, with a high near 55. South wind 9 to 14 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Tonight:
Light Rain
Lo 41 °F
Rain before 1am, then a chance of rain and patchy fog between 1am and 3am, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 41. Southwest wind 6 to 13 mph, with gusts as high as 31 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Saturday:
Patchy Fog then Mostly Sunny
Hi 51 °F
Patchy fog before 9am. Mostly sunny, with a high near 51. Northwest wind 7 to 10 mph, with gusts as high as 21 mph.
Saturday Night:
Mostly Cloudy then Slight Chance Light Snow
Lo 36 °F
A slight chance of snow after 5am. Mostly cloudy, with a low around 36. West wind 2 to 7 mph. Chance of precipitation is 20%.
Sunday:
Chance Light Snow then Rain And Snow
Hi 51 °F
A chance of snow before 8am, then rain and snow. Cloudy, with a high near 51. South wind 5 to 9 mph. Chance of precipitation is 80%.
Sunday Night:
Light Rain Likely
Lo 34 °F
Rain likely. Cloudy, with a low around 34. North wind around 8 mph. Chance of precipitation is 70%.
Monday:
Chance Light Rain
Hi 42 °F
A chance of rain. Cloudy, with a high near 42. North wind around 10 mph. Chance of precipitation is 50%.
Monday Night:
Slight Chance Light Snow then Mostly Cloudy
Lo 28 °F
A slight chance of rain before 8pm, then a slight chance of snow between 8pm and 9pm. Mostly cloudy, with a low around 28. Northwest wind 6 to 9 mph.
Tuesday:
Mostly Sunny
Hi 44 °F
Mostly sunny, with a high near 44. Northwest wind around 7 mph.
Tuesday Night:
Mostly Cloudy then Slight Chance Light Snow
Lo 31 °F
A slight chance of snow after 5am. Mostly cloudy, with a low around 31. Southwest wind around 7 mph.
Wednesday:
Chance Rain And Snow
Hi 48 °F
A slight chance of snow before 7am, then a chance of rain and snow. Mostly cloudy, with a high near 48. West wind 7 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Wednesday Night:
Slight Chance Light Rain then Partly Cloudy
Lo 29 °F
A slight chance of rain before 9pm. Partly cloudy, with a low around 29. Northwest wind around 10 mph.
Thursday:
Mostly Sunny
Hi 47 °F
Mostly sunny, with a high near 47. West wind around 9 mph.
Thursday Night:
Light Rain Likely
Lo 35 °F
Rain likely after 8pm. Mostly cloudy, with a low around 35. Southwest wind around 10 mph.
NWS Hourly Forecast -
Today 2pm through Sun 1am
Issued by:
National Weather Service Boston / Norton, MA
Updated Fri Mar 20, 2026 1:08pm EDT
2:00pm
Dew Pt 34°F
S 10 mphPrecip: 6%
3:00pm
Dew Pt 35°F
S 12 mphPrecip: 8%
4:00pm
Dew Pt 35°F
S 13 mphPrecip: 16%
5:00pm
Dew Pt 34°F
S 14 mphPrecip: 24%
6:00pm
Dew Pt 34°F
S 13 mphPrecip: 41%
7:00pm
Dew Pt 34°F
Wind Chill: 46°F
S 12 mphPrecip: 58%
Rain: 0.01 in
8:00pm
Dew Pt 36°F
Wind Chill: 44°F
SW 12 mphPrecip: 75%
Rain: 0.02 in
9:00pm
Dew Pt 38°F
Wind Chill: 41°F
SW 10 mphPrecip: 79%
Rain: 0.02 in
10:00pm
Dew Pt 39°F
Wind Chill: 40°F
SW 10 mphPrecip: 83%
Rain: 0.02 in
11:00pm
Dew Pt 39°F
Wind Chill: 40°F
SW 10 mphPrecip: 86%
Rain: 0.02 in
12:00am
Dew Pt 40°F
Wind Chill: 40°F
SW 9 mphPrecip: 66%
Rain: 0.02 in
1:00am
Dew Pt 41°F
Wind Chill: 41°F
SW 8 mphPrecip: 45%
Rain: 0.01 in
2:00am
Dew Pt 40°F
Wind Chill: 40°F
SW 7 mphPrecip: 25%
Rain: 0.02 in
3:00am
Dew Pt 41°F
Wind Chill: 40°F
SW 6 mphPrecip: 21%
Rain: 0.01 in
4:00am
Dew Pt 41°F
Wind Chill: 40°F
SW 6 mphPrecip: 17%
Rain: 0.01 in
5:00am
Dew Pt 41°F
Wind Chill: 40°F
W 6 mphPrecip: 13%
6:00am
Dew Pt 40°F
Wind Chill: 38°F
W 7 mphPrecip: 11%
7:00am
Dew Pt 39°F
Wind Chill: 37°F
NW 7 mphPrecip: 9%
8:00am
Dew Pt 38°F
Wind Chill: 37°F
NW 8 mphPrecip: 7%
9:00am
Dew Pt 37°F
Wind Chill: 37°F
NW 9 mphPrecip: 1%
10:00am
Dew Pt 34°F
Wind Chill: 40°F
NW 9 mphPrecip: 0%
11:00am
Dew Pt 33°F
Wind Chill: 42°F
NW 10 mphPrecip: 0%
12:00pm
Dew Pt 31°F
Wind Chill: 44°F
NW 10 mphPrecip: 0%
1:00pm
Dew Pt 29°F
Wind Chill: 45°F
NW 10 mphPrecip: 0%
2:00pm
Dew Pt 27°F
Wind Chill: 46°F
NW 10 mphPrecip: 0%
3:00pm
Dew Pt 26°F
Wind Chill: 46°F
NW 10 mphPrecip: 0%
4:00pm
Dew Pt 24°F
Wind Chill: 46°F
NW 9 mphPrecip: 0%
5:00pm
Dew Pt 23°F
Wind Chill: 46°F
NW 9 mphPrecip: 1%
6:00pm
Dew Pt 24°F
Wind Chill: 43°F
NW 7 mphPrecip: 1%
7:00pm
Dew Pt 24°F
Wind Chill: 42°F
N 6 mphPrecip: 2%
8:00pm
Dew Pt 25°F
Wind Chill: 40°F
NW 6 mphPrecip: 0%
9:00pm
Dew Pt 26°F
Wind Chill: 39°F
NW 5 mphPrecip: 0%
10:00pm
Dew Pt 26°F
Wind Chill: 39°F
N 3 mphPrecip: 0%
11:00pm
Dew Pt 26°F
Wind Chill: 38°F
N 3 mphPrecip: 1%
12:00am
Dew Pt 26°F
Wind Chill: 37°F
NW 3 mphPrecip: 3%
1:00am
Dew Pt 27°F
W 2 mphPrecip: 6%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 201725
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
125 PM EDT Fri Mar 20 2026
.WHAT HAS CHANGED...
No significant changes.
&&
.KEY MESSAGES...
- Windy with showers tonight but rainfall will not be
significant.
- Rain arrives Sunday which could start or end as some wet snow.
Minor accumulations possible especially in northern MA and in
higher elevations.
- Below average temperatures to start the work week then
moderating temperatures and some showers possible Wednesday
and Friday.
&&
.DISCUSSION...
KEY MESSAGE 1...Windy with showers tonight but rainfall will
not be significant.
Approaching cold front will bring a period of showers to much of
southern New England tonight, mainly in 6 pm to midnight time frame,
but a little later on Cape Cod and Islands. Not much in way of
dynamics or deep moisture present ahead of front, so rainfall is
expected to be light, mainly 0.25 to perhaps 0.75 inch.
Ahead of front, tightening pressure gradient and increasing low
level jet (as high as 45-55kt) will bring windy conditions to
much of region. Forecast soundings show shallow mixing layer
which will prevent strongest winds aloft from reaching surface,
but we should still see gusts on order of 25-35 mph and perhaps
up to 40 mph in a few locations. Looks like gusts will fall
short of Wind Advisory criteria. Winds diminish overnight as
front pushes through and low level jet heads offshore.
High pressure builds into New England Saturday. Expecting a breezy
day with gusts of 20-30 mph due to cold advection and deep mixing
aloft, but March sunshine should offset cold advection and help
highs get well into 40s and lower 50s.
KEY MESSAGE 2...Rain arrives Sunday which could start or end
as some wet snow. Minor accumulations possible especially in
northern MA and in higher elevations.
Timing is everything and in this case will determine whether or not
we see some wet snow Sunday morning (if precipitation begins early)
or as things wind down later Sunday night and Monday morning (if
enough cold air can sink southward sooner).
We're getting into window for high-res guidance and there are hints
that some scattered snow showers could sneak into southern New
England Sunday morning due to weak warm advection and enough cold
air still in place, especially north of Mass Pike (as seen on 3km
NAM and RRFS). That's something that will be resolved as we get
closer in time but at this point does not look to be impactful.
Overall, this looks to be a rain event for southern New England
with most of rain falling Sunday evening into early Monday
morning as frontal boundary lies just to our north, keeping us
in warm sector. Models do sag front southward later Sunday
night, allowing colder air to seep southward, but by then all of
the appreciable lift and deeper moisture should be exiting
region.
Should front drop south sooner, however, we would see an earlier
changeover to snow and would see some minor snow accumulations,
especially north of Mass Pike and in higher elevations. Latest
ensembles continue to show low chances (20-30%) of 1" or more of
snow for those locations, but it would not take much of a shift
southward to bring a little more snow. Elsewhere, even if it snows,
little or no accumulation is expected. Model snow depth change maps
will give best depiction in this case but we've seen 12z NAM which
is definitely an outlier right now. It closes off 850 low near Cape
Cod which brings stronger lift and deepens colder air quickly Monday
morning, something not supported by majority of guidance which
favors a more progressive system. Something to watch though.
One other thing to mention is we are in a period of high
astronomical tides through the weekend. The early Monday morning
high tide (2-4 am) along E MA coast is one we are keeping an eye on
since the astronomical tide is 11.0 ft at Boston and 3.8 ft at
Nantucket. Right now the higher-end scenario with a surge of 1.0
feet keeps both below flood stage but with increasing N/NE winds
around the time of high tide (depending on how fast the front drops
south), the surge could end up being a little higher. Worst case
right now looks to be splashover or lower-end minor coastal flooding.
KEY MESSAGE 3...Below average temperatures to start the work
week then moderating temperatures and some showers possible
Wednesday and Friday.
High pressure brings dry weather Monday and Tuesday along with
seasonable temperatures for late March, although it looks like we're
in for a couple of cold mornings both days. Upper pattern shows
fairly rapid west to east flow aloft which makes it difficult to
time short waves moving through, but it does appear we could see
some showers Wednesday and again Friday as a series of weak lows
cross the region. We should also see a moderating trend in
temperatures but it may be cold enough initially both days for some
wet snow at onset across interior.
&&
.AVIATION /16Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update: High confidence (60%).
VFR conditions this afternoon give way to MVFR and eventually IFR as
a band of showers moves through southern New England, starting
around 21z in western MA, reaching BDL-ORH-BED around 23z, BOS-PVD
around 00z, and FMH/HYA/ACK 02-03z. Showers last about 6 hours and
leave IFR cigs/vsbys in their wake, before improvement to VFR Sat
morning as winds shift to NW.
Main concern is wind, especially through early tonight with S/SW
winds gusting to 20-30kt and LLWS with 020 winds 190/40-50kt. Winds
subside later tonight and become W, then NW Sat morning, as
front moves offshore. A few 20kt gusts expected into early Sat
afternoon.
KBOS Terminal...High confidence in TAF. Peak gusts expected just
before 00z Sat with brief 35kt gusts possible.
KBDL Terminal...High confidence in TAF.
Outlook /Sunday through Tuesday/...
Sunday: Mainly VFR, with areas MVFR possible. Breezy. Chance
RA, chance SN.
Sunday Night: Mainly MVFR, with areas IFR possible. Breezy. RA
likely, chance SN.
Monday: Mainly VFR, with local IFR possible. Breezy. Chance RA,
chance SN.
Monday Night through Tuesday: VFR. Breezy.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
High confidence through the weekend.
SCAs remain posted through tonight for increasing S/SW winds gusting
as high as 30kt. It's possible a few gusts reach marginal Gale force
(34kt) but we don't think that will be widespread or last more than
an hour or two at most. Showers move through waters tonight and
should exit waters east of Cape Cod overnight.
NW winds behind front Saturday should remain below SCA but it will
remain in place for outer waters where seas will take awhile longer
to fall below 5 ft.
Cold front dropping south across waters Monday may be accompanied by
period of 20-25kt N/NE winds.
Outlook /Sunday through Tuesday/...
Sunday: Winds less than 25 kt. Chance of rain.
Sunday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Rain likely.
Monday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Areas of rough seas. Chance of rain.
Monday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Rough seas up to 9 ft.
Tuesday: Winds less than 25 kt. Areas of rough seas.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 AM EDT Saturday for ANZ230-236.
Small Craft Advisory until 5 AM EDT Saturday for ANZ231>235-
237-251.
Small Craft Advisory until 8 PM EDT Saturday for ANZ250-
254>256.
&&
$$
DISCUSSION...JWD
AVIATION...JWD
MARINE...JWD
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: 3 Medium
Current (Estimated): 3 Medium
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
Thursday:
2.88 in
March:
4.59 in
2026
50.9 in
Season Snow:
4 snow days in March
Daily Extremes [‒] Daily Extremes [+]
1:40pm
57.6°F
High today:
6:46am
31.6°F
Low today:
3:56pm
39.7°F
High Thursday:
1:38am
27.0°F
Low Thursday:
3:36am
30.9°F
Low wind chill today:
9:44am
26.8°F
Low wind chill Thursday:
2:07pm
39.0°F
High dew pt today:
11:32pm
30.0°F
High dew pt Thursday:
1:12pm
15 mph
Wind gust today:
1:53pm
8 mph
Wind gust Thursday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
6:20am
Sunrise:
6:48am
Sunset:
6:57pm
Twilight ends:
7:25pm
Daylight length:
12 hours 9 minutes
Phase:
Waxing Crescent (4%)
Moon rise:
7:18am
Moon set:
9:17pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
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