Lexington, Massachusetts, USA
35.1°F
1.7°C
Cold
Clear
Today: Hi 66 °F
Tonight: Lo 34 °F
Dew Point:
32.4°F
Humidity: 90%
UV Index: 0.0 None
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.01 in
Rain Sunday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Mon Mar 9, 2026 2:49am EDT
Patchy Fog then Sunny
Hi 66 °F
Patchy fog before 8am. Sunny, with a high near 66. Southwest wind 5 to 9 mph, with gusts as high as 23 mph.
Clear then Patchy Fog
Lo 34 °F
Patchy fog after 2am. Clear, with a low around 34. Southwest wind around 8 mph.
Patchy Fog then Sunny
Hi 71 °F
Patchy fog before 8am. Sunny, with a high near 71. Southwest wind around 7 mph.
Partly Cloudy
Lo 42 °F
Partly cloudy, with a low around 42. Southwest wind around 6 mph.
Chance Light Rain
Hi 56 °F
A chance of rain after 10am. Mostly cloudy, with a high near 56. Southeast wind 5 to 9 mph. Chance of precipitation is 30%.
Chance Light Rain
Lo 49 °F
A chance of rain. Mostly cloudy, with a low around 49. South wind 8 to 12 mph. Chance of precipitation is 50%.
Light Rain Likely
Hi 57 °F
Rain likely. Mostly cloudy, with a high near 57. West wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Chance Light Snow
Lo 27 °F
A chance of rain before 8pm, then a chance of snow between 8pm and 2am. Partly cloudy, with a low around 27. Northwest wind 8 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.
Partly Sunny then Slight Chance Light Snow
Hi 43 °F
A slight chance of snow between 4pm and 5pm, then a slight chance of rain and snow. Partly sunny, with a high near 43. Southwest wind 6 to 10 mph.
Rain And Snow Likely
Lo 34 °F
Rain and snow likely. Mostly cloudy, with a low around 34. Southwest wind around 10 mph. Chance of precipitation is 60%. New snow accumulation of less than half an inch possible.
Chance Light Snow
Hi 46 °F
A chance of snow before 11am, then a slight chance of rain and snow between 11am and 3pm. Partly sunny, with a high near 46. West wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New snow accumulation of less than half an inch possible.
Partly Cloudy
Lo 29 °F
Partly cloudy, with a low around 29. West wind 5 to 10 mph.
Chance Rain And Snow
Hi 47 °F
A chance of rain and snow after 8am. Mostly cloudy, with a high near 47. Southwest wind 5 to 9 mph. Chance of precipitation is 30%.
Rain And Snow Likely
Lo 37 °F
Rain and snow likely. Cloudy, with a low around 37. South wind around 12 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Mon Mar 9, 2026 1:00pm EDT

S 8 mph
SW 9 mph
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SW 7 mph
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000
FXUS61 KBOX 091617
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
1217 PM EDT Mon Mar 9 2026
.WHAT HAS CHANGED...
No significant changes to the forecast. High confidence in near
record high temperatures on Tuesday.
&&
.KEY MESSAGES...
- Area of fog quickly dissipate by mid-morning.
Otherwise...sunshine returns today & Tue with well above
normal temps. Highs mainly in the 60s today & near record
highs Tue in the upper 60s to lower 70s away from parts of the
immediate coast.
- Trending more unsettled mid to late week with a round or two of
precipitation. Back to cool temperatures by Friday.
- Expecting significant snowmelt over the coming week. Minor
river flooding possible.
&&
.DISCUSSION...
KEY MESSAGE 1...Area of fog quickly dissipate by mid-morning.
Otherwise...sunshine returns today & Tue with well above normal
temps. Highs mainly in the 60s today & near record highs Tue in the
upper 60s to lower 70s away from parts of the immediate coast.
Areas of fog covered the region early this morning especially near
the south coast where it was locally dense. The fog will quickly
burn off after sunrise given a lot of dry air just above the
boundary layer.
Unlike the weekend...model soundings indicate lots of sunshine today
and Tue. This will allow that anomalous warmth in the 850/925 mb
layers to begin to mix down to the surface. 925T around +10C today
should allow many locations to see highs well into the 60s. Mainly
clear skies & light winds will still allow for another good night of
radiational cooling tonight. Low temps tonight should bottom out in
the upper 20s & 30s...but lower 40s in the Urban Heat Island of
Boston as well as Worcester airport given the anomalous warm air
aloft.
By Tue...925T near +14C should allow for near record high temps in
the upper 60s to the lower 70s! We feel that given the overall
setup...the NBM is significantly too cool with the high temps today
and Tue. Of course it will be noticeably cooler on the immediate
south coast, Cape and Islands given the modified marine airmass
given S-SW winds. We may also need to watch for a subtle sea breeze
potential on Tue on parts of the immediate eastern MA coast...but
that remains uncertain. All in all...well above normal
temps/springlike weather is on tap for the next two days with near
record highs possible on Tue.
KEY MESSAGE 2...Trending more unsettled mid to late week with a
round or two of precipitation. Back to cool temperatures by Friday.
After a dry and sunny few days Wednesday will be a transition day
between early week ridging and a shortwave trough that crosses the
region on Thursday. Ahead of said trough warm SW flow continues,
keeping temperatures elevated. However, increasing moisture moves
north as well so the clouds return keeping a check on temps, only
reaching the upper 50s to low 60s. A caveat is that in extreme
northeast MA a backdoor cold front may reduce temperatures further.
A weaker leading wave moves through on Wednesday increasing the
chance for scattered rain showers, mainly over the interior. It
isn't until Thursday that the main trough and robust cold front move
through. Favorable placement beneath the RRQ of a 150kt 300 mb jet
combined with a 65kt LLJ will work on a moist environment (PWATs
near 1.25") to produce widespread precipitation Thursday into
Thursday night. It likely starts as rain for all before
transitioning to snow on the back end for the high terrain.
Friday the post frontal airmass overhead means cooler temperatures,
in the 40s. Another disturbance passing to our north may bring some
scattered rain/high elevation snow showers around Friday night but
confidence is low in specifics on how the pattern evolves beyond
Thursday.
KEY MESSAGE 3...Expecting significant snowmelt over the coming week.
Minor river flooding possible.
Given the prolonged period of elevated temperatures/dewpoints,
combined with the significant melting we've seen the last few days,
snowmelt will increasingly contribute back to the watershed leading
to rises, potentially into minor flood stage. Guidance continues to
indicate the most likely spots to see flooding are along the
Connecticut River by next weekend with addition of S. RI rivers by
early next week.
&&
.AVIATION /16Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update: High confidence.
IFR/LIFR in fog should return quickly to Cape Cod and the
Islands by this evening and persist overnight. Elsewhere we
expect another night of patchy valley fog with more brief IFR
conditions. VFR Tue with S/SW flow. Conditions should improve
quickly Tue morning near Cape Cod and Islands.
Other concern is for a period of LLWS in central/eastern MA and
RI early tonight as SW winds at 2000 ft increase to 35-40kt.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Tuesday Night through Friday/...
Tuesday Night: VFR.
Wednesday: Mainly VFR, with local IFR possible. Breezy. Chance
RA.
Wednesday Night: MVFR/IFR conditions possible. Windy with local
gusts up to 30 kt. Chance RA.
Thursday: Mainly VFR, with local MVFR possible. Windy with
local gusts up to 30 kt. Chance RA.
Thursday Night: Windy with local gusts up to 30 kt. Slight
chance SN.
Friday: Breezy. Slight chance SN.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today through Tuesday...High confidence.
The last of the lingering small craft swell should finally drop
below criteria across our southern outer-waters by mid-late morning.
Otherwise...a weak pressure gradient will keep winds and seas below
small craft advisory thresholds through Tue. Areas of fog...some of
which will be dense at times will impact our southern waters during
the overnight and early morning hours. This will result in poor
vsbys for mariners at times.
Outlook /Tuesday through Friday/...
Monday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Patchy fog. Areas of visibility 1 nm or less.
Tuesday: Winds less than 25 kt. Patchy fog. Local visibility
1 nm or less.
Tuesday Night: Winds less than 25 kt.
Wednesday: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain.
Wednesday Night: Strong winds with gusts up to 35 kt. Areas of
rough seas. Chance of rain.
Thursday: Strong winds with gusts up to 30 kt. Rough seas up to
13 ft. Chance of rain.
Thursday Night: Strong winds with gusts up to 30 kt. Areas of
rough seas. Chance of rain, slight chance of snow.
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...Frank/BW
AVIATION...JWD
MARINE...Frank/BW
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 4 Medium
Current (Measured): 0.0 None
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:
0.01 in
Rain Today:
0.00 in
Sunday:
0.01 in
March:
1.26 in
2026
1:17pm
36.1°F
High today:
12:00am
25.2°F
Low today:
2:28pm
30.4°F
High Sunday:
7:11am
16.2°F
Low Sunday:
12:00am
25.2°F
Low wind chill today:
7:11am
16.2°F
Low wind chill Sunday:
1:17pm
33.3°F
High dew pt today:
11:56pm
20.7°F
High dew pt Sunday:
None
Wind gust today:
None
Wind gust Sunday:
No alerts/warnings active for Southeast Middlesex County.
No snow expected in Lexington.
First Light:
6:11am
Sunrise:
6:39am
Sunset:
5:19pm
Twilight ends:
5:47pm
Daylight length:
10 hours 39 minutes
Phase:
Waning Gibbous (82%)
Moon set:
8:18am
Moon rise:
9:38pm