Lexington Weather
Lexington, Massachusetts, USA
- Clear
-
63.3°F / 17.4°C
-
56.3°F
-
78%
- Calm, 10-min avg: Calm, gust: 1 mph
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
63.3°F
17.4°C
Comfortable
Clear
Tonight: Lo 62 °F
Sunday: Hi 72 °F
Dew Point:
56.3°F
Humidity:
78%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Friday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 1 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Tonight,
Sunday,
&
Sunday Night
through
Saturday
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sat Sep 12, 2026 10:19pm EDT
Overview:
- Confidence continues for a period of torrential and a risk of flooding across much of Rhode Island and southeast Massachusetts.
- High pressure in control next week brings generally quiet weather. Brief bout of summer warmth and humidity expected Wed-Fri.
Tonight:
Mostly Cloudy
Lo 62 °F
Mostly cloudy, with a low around 62. South wind around 5 mph.
Sunday:
Showers And T-Storms
Hi 72 °F
A chance of rain showers between 7am and 10am, then showers and thunderstorms between 10am and 5pm. Some of the storms could produce heavy rain. Cloudy, with a high near 72. Southeast wind around 7 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night:
Mostly Cloudy then Chance Rain Showers
Lo 61 °F
A chance of rain showers after 2am. Mostly cloudy, with a low around 61. West wind 2 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Monday:
Slight Chance Rain Showers then Sunny
Hi 74 °F
A slight chance of rain showers before 8am. Sunny, with a high near 74. Northwest wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Monday Night:
Clear
Lo 46 °F
Clear, with a low around 46. North wind 3 to 13 mph.
Tuesday:
Sunny
Hi 66 °F
Sunny, with a high near 66. Southeast wind 3 to 9 mph.
Tuesday Night:
Mostly Clear
Lo 53 °F
Mostly clear, with a low around 53. South wind 2 to 9 mph.
Wednesday:
Sunny
Hi 78 °F
Sunny, with a high near 78. Southwest wind around 6 mph.
Wednesday Night:
Partly Cloudy
Lo 60 °F
Partly cloudy, with a low around 60. Southwest wind around 5 mph.
Thursday:
Mostly Sunny
Hi 80 °F
Mostly sunny, with a high near 80. South wind 3 to 7 mph.
Thursday Night:
Slight Chance Rain Showers
Lo 62 °F
A slight chance of rain showers. Partly cloudy, with a low around 62. Southwest wind around 7 mph.
Friday:
Slight Chance Rain Showers
Hi 77 °F
A slight chance of rain showers. Partly sunny, with a high near 77. Northwest wind around 8 mph.
Friday Night:
Slight Chance Rain Showers
Lo 56 °F
A slight chance of rain showers before 5am. Mostly cloudy, with a low around 56. North wind around 6 mph.
Saturday:
Mostly Sunny then Slight Chance Rain Showers
Hi 72 °F
A slight chance of rain showers after 3pm. Mostly sunny, with a high near 72. Northeast wind around 7 mph.
NWS Hourly Forecast -
Tonight 11pm through Mon 10am
Issued by:
National Weather Service Boston / Norton, MA
Updated Sat Sep 12, 2026 10:19pm EDT
11:00pm
Dew Pt 58°F
S 5 mphPrecip: 0%
12:00am
Dew Pt 58°F
S 5 mphPrecip: 0%
1:00am
Dew Pt 58°F
S 5 mphPrecip: 1%
2:00am
Dew Pt 59°F
S 5 mphPrecip: 1%
3:00am
Dew Pt 59°F
S 5 mphPrecip: 2%
4:00am
Dew Pt 59°F
S 5 mphPrecip: 5%
5:00am
Dew Pt 59°F
S 5 mphPrecip: 3%
6:00am
Dew Pt 60°F
S 6 mphPrecip: 14%
7:00am
Dew Pt 60°F
S 6 mphPrecip: 26%
8:00am
Dew Pt 62°F
S 7 mphPrecip: 37%
Rain: 0.06 in
9:00am
Dew Pt 64°F
S 7 mphPrecip: 54%
Rain: 0.09 in
10:00am
Dew Pt 65°F
SE 6 mphPrecip: 100%
Rain: 0.16 in
11:00am
Dew Pt 65°F
SE 6 mphPrecip: 100%
Rain: 0.16 in
12:00pm
Dew Pt 67°F
SE 6 mphPrecip: 100%
Rain: 0.16 in
1:00pm
Dew Pt 67°F
SE 7 mphPrecip: 100%
Rain: 0.16 in
2:00pm
Dew Pt 68°F
E 7 mphPrecip: 78%
Rain: 0.12 in
3:00pm
Dew Pt 68°F
E 7 mphPrecip: 65%
Rain: 0.1 in
4:00pm
Dew Pt 68°F
E 6 mphPrecip: 42%
Rain: 0.06 in
5:00pm
Dew Pt 67°F
E 6 mphPrecip: 12%
Rain: 0.02 in
6:00pm
Dew Pt 66°F
NE 5 mphPrecip: 8%
Rain: 0.01 in
7:00pm
Dew Pt 66°F
N 3 mphPrecip: 6%
Rain: 0.01 in
8:00pm
Dew Pt 66°F
N 2 mphPrecip: 4%
9:00pm
Dew Pt 66°F
NW 2 mphPrecip: 3%
10:00pm
Dew Pt 66°F
W 2 mphPrecip: 2%
11:00pm
Dew Pt 66°F
W 2 mphPrecip: 1%
12:00am
Dew Pt 65°F
W 3 mphPrecip: 8%
1:00am
Dew Pt 65°F
W 3 mphPrecip: 14%
2:00am
Dew Pt 65°F
SW 5 mphPrecip: 21%
Rain: 0.02 in
3:00am
Dew Pt 64°F
W 6 mphPrecip: 24%
Rain: 0.02 in
4:00am
Dew Pt 63°F
W 6 mphPrecip: 28%
Rain: 0.02 in
5:00am
Dew Pt 61°F
W 7 mphPrecip: 31%
Rain: 0.02 in
6:00am
Dew Pt 59°F
W 8 mphPrecip: 24%
Rain: 0.02 in
7:00am
Dew Pt 58°F
W 9 mphPrecip: 16%
Rain: 0.01 in
8:00am
Dew Pt 57°F
W 10 mphPrecip: 9%
9:00am
Dew Pt 56°F
NW 12 mphPrecip: 7%
10:00am
Dew Pt 55°F
NW 14 mphPrecip: 5%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 122246
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
646 PM EDT Sat Sep 12 2026
.WHAT HAS CHANGED...
Expanded the Flood Watch to include Windham, Southern Worcester,
Suffolk, and Suffolk Counties. Monitoring a very low chance for
waterspouts and a weak tornado across the south coast. The risk for
any severe thunderstorms is dwarfed by the hydrologic risk, however.
&&
.KEY MESSAGES...
- Confidence continues for a period of torrential and a risk of flooding
across much of Rhode Island and southeast Massachusetts.
- High pressure in control next week brings generally quiet
weather. Brief bout of summer warmth and humidity expected
Wed-Fri.
&&
.DISCUSSION...
KEY MESSAGE 1...Confidence continues for a period of torrential and
a risk of flooding across much of Rhode Island and southeast
Massachusetts.
Main forecast focus for the next 48 hours continues to be on a
shortwave and warm front later tonight through much of the day on
Sunday. Aloft, the area will find itself in the right entrance
region of a 80-90 kt jet by 12z Sunday morning. So, synoptically,
there are plenty of jet and frontal dynamics at play to allow for a
heavy rain event. The thermodynamic environment certainly isn't
lacking either, with model soundings showing PWATs climbing to >2"
which is near the 99th percentile of climatology for September 13th.
These highly anomalous PWATs pair with a nearly saturated
atmospheric column and warm cloud heights of 12-14kft and allow for
efficient rainfall processes and areas of torrential rain. Taking
these conditions into account it makes sense that the 12z HREF shows
a 40-55% chance for 3 hour rainfall amounts to exceed flash flood
guidance covering an area from eastern Connecticut to Rhode Island
and SE Massachusetts. Additionally, there is still a strong (55-70%)
chance for 6-24 HR precipitation values to exceed the 5 year ARI and
a moderate (25-40%) chance of exceeding the 10 year ARI. The
greatest concern for areas of flash flooding is across the urban
corridor from Providence to interior SE MA. Still some uncertainty
with regards to the exact placement of the heaviest rain it will be
contingent upon the placement of a mesoscale low. Subtle
differences in deterministic guidance have this band as far south as
the south coast and as far north as northern Massachusetts. Think
the HREF and RRFS handle these differences best by centering
the highest rainfall totals along the I-95 corridor.
Given the uncertainty and the N jog in guidance, opted to expand the
Flood Watch to include Windham county in eastern Connecticut,
southern Worcester County, Norfolk county, and Suffolk County
including Boston. Elsewhere, a widespread 0.50" to 1.50" expected
across much of our region Within the watch there will likely be
localized narrow bands of 2"-4" of rain possible inside 3 hours. The
narrow but intense area of rainfall likely comes to an end from west
to east between 2 and 5 pm.
On a final note, while the main threat is areas of flash flooding,
there is a low albeit non-zero chance for isolated severe weather
across coastal RI and MA. CAMs show a narrow area of MLCAPE
approaching 300-500 J/kg across coastal areas. Paired with 0-1km
shear of ~20kts and curved hodographs there is a very low chance for
a spin up or a waterspout as the mesolow passes late tomorrow
morning into the afternoon. What's lacking is adequate instability
or lapse rates for deeper convection but worth keeping an eye on.
KEY MESSAGE 1...High pressure in control next week brings generally
quiet weather. Brief bout of summer warmth and humidity expected Wed-
Fri.
The start of the new work week starts with some lingering showers as
the cold front makes its way offshore. Rain comes to an end after
sunrise for western MA/CT while showers linger into the early-mid
afternoon across eastern MA/RI. Eventually dry NW post frontal flow
advects 40-50F dewpoints overhead which combined with highs in the
low to mid 70s Mon and Tue will make for a comfortable and
seasonable first half of the week. This, as high pressure is in
control at the surface through much of the week keeping us dry. As
the high shifts offshore Wednesday flow turns southerly bringing the
return of more summer-like temperatures and dewpoints in the upper
70s and mid 60s respectively. Uncertainty increases with regard to
the forecast for late week next weekend. Zonal mid level flow
continues into the weekend with potential for a low to cross
somewhere in the vicinity of southern New England; whether that
stays to our north or goes overhead is uncertain, but generally
looking at a better shot of unsettled weather late Thursday
onward.
&&
.AVIATION /00Z SUNDAY THROUGH THURSDAY/...
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. S winds. Ceilings remain VFR most of the night, though
area gradually lowering to low- end VFR between 08-12z.
Sunday...High confidence in trends, moderate confidence in timing.
Widespread showers and potentially a few embedded thunderstorms will
overspread the region from west to east roughly 09z-14z Sunday
morning. This will result in low-end MVFR to IFR conditions
developing with even brief LIFR conditions in narrow bands of
torrential rainfall. The bulk of the heaviest showers should be
exiting the southeast New England coast by 22z/23z. Winds will be
light from a S-SE direction. With eastern coastal MA going E. There
also may be a period of LLWS.
Sunday Night...High confidence.
Low-end VFR to MVFR ceilings. Wind shift to the NW behind the front.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Monday through Thursday/...
Monday through Monday Night: VFR. Breezy.
Tuesday through Thursday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today through Sunday...High confidence.
A warm front than approaches and crosses the waters on Sunday.
Surface gradient should remain weak enough to keep winds/seas
below small craft advisory thresholds through Sunday.
However...the main concern for mariners will be heavy showers
and potentially a few embedded thunderstorms on Sunday with
reduced visibility. There is a very low chance for a water spout
or two mainly across the near-shore waters along the S coast.
Outlook /Monday through Thursday/...
Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Chance of rain showers.
Monday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft.
Tuesday through Tuesday Night: Winds less than 25 kt. Areas of
seas approaching 5 ft.
Wednesday through Wednesday Night: Winds less than 25 kt. Seas
up to 5 ft.
Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Flood Watch from 5 AM EDT Sunday through Sunday afternoon for
CTZ004.
MA...Flood Watch from 5 AM EDT Sunday through Sunday afternoon for
MAZ012-013-015>024.
RI...Flood Watch from 5 AM EDT Sunday through Sunday afternoon for
RIZ001>008.
MARINE...None.
&&
$$
DISCUSSION...BW/FT
AVIATION...BW/Dooley
MARINE...FT
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: 1 Low
Current (Estimated): 0 None
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
Friday:
1.07 in
September:
20.97 in
2026
Daily Extremes [‒] Daily Extremes [+]
2:06pm
78.1°F
High today:
6:53am
52.5°F
Low today:
2:24pm
75.6°F
High Friday:
11:49pm
59.5°F
Low Friday:
6:32pm
59.7°F
High dew pt today:
11:36am
56.1°F
High dew pt Friday:
8:43pm
5 mph
Wind gust today:
4:43pm
5 mph
Wind gust Friday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
5:54am
Sunrise:
6:22am
Sunset:
7:00pm
Twilight ends:
7:29pm
Daylight length:
12 hours 38 minutes
Phase:
Waxing Crescent (5%)
Moon rise:
7:59am
Moon set:
7:27pm
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