Lexington Weather
Lexington, Massachusetts, USA
- Clear
-
70.9°F / 21.6°C
- 67.5°F
-
89%
- Calm, 10-min avg: Calm, gust: None
-
- 10 miles
- 0.00 in
National Weather Service Forecast for:
Lexington, MA
Issued by:
National Weather Service Boston / Norton, MA
Overnight through Thursday
Point Forecast Updated Fri Aug 28, 2026 12:30am EDT
Overview:
- A few stronger storms are possible, mainly west of the CT
River Valley today.
- Spot shower or thunderstorm possible Friday, otherwise a
mainly dry and pleasant late-summer day.
- Seasonable temperatures and dry weather this weekend.
- Cloudy and unsettled early to mid next week with several
opportunities for showers and storms, but the timing of them
is uncertain.
Overnight:
Patchy Fog
Lo 69 °F
Patchy fog after 5am. Cloudy, with a low around 69. Southwest wind around 5 mph.
Friday:
Slight Chance Showers And T-Storms
Hi 84 °F
Patchy fog before 8am, then a slight chance of showers and thunderstorms between 11am and 1pm, then a chance of showers and thunderstorms between 1pm and 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Southwest wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Friday Night:
Slight Chance Showers And T-Storms then Partly Cloudy
Lo 60 °F
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. Northwest wind around 6 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Saturday:
Sunny
Hi 79 °F
Sunny, with a high near 79. North wind around 6 mph.
Saturday Night:
Mostly Clear
Lo 56 °F
Mostly clear, with a low around 56. Southwest wind around 3 mph.
Sunday:
Sunny
Hi 86 °F
Sunny, with a high near 86. West wind 3 to 9 mph.
Sunday Night:
Partly Cloudy then Slight Chance Rain Showers
Lo 67 °F
A slight chance of rain showers after 2am. Partly cloudy, with a low around 67. West wind 3 to 7 mph.
Monday:
Slight Chance Rain Showers
Hi 81 °F
A slight chance of rain showers. Partly sunny, with a high near 81. North wind around 6 mph.
Monday Night:
Chance Rain Showers
Lo 64 °F
A chance of rain showers before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. East wind around 5 mph. Chance of precipitation is 40%.
Tuesday:
Chance Showers And T-Storms
Hi 78 °F
A chance of showers and thunderstorms. Partly sunny, with a high near 78. Northeast wind 2 to 7 mph. Chance of precipitation is 40%.
Tuesday Night:
Chance Showers And T-Storms
Lo 64 °F
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. East wind around 6 mph. Chance of precipitation is 50%.
Wednesday:
Chance Rain Showers
Hi 78 °F
A chance of rain showers. Mostly cloudy, with a high near 78. East wind 3 to 8 mph. Chance of precipitation is 40%.
Wednesday Night:
Chance Rain Showers
Lo 64 °F
A chance of rain showers. Mostly cloudy, with a low around 64. Northeast wind around 7 mph. Chance of precipitation is 40%.
Thursday:
Chance Rain Showers
Hi 78 °F
A chance of rain showers. Partly sunny, with a high near 78. Northeast wind around 8 mph.
Today 1am through Sat 12pm EDT
Updated Fri Aug 28, 2026 12:30am EDT
1:00am
Dew Pt 68°F
S 5 mphPrecip: 7%
2:00am
Dew Pt 68°F
S 3 mphPrecip: 5%
3:00am
Dew Pt 68°F
S 3 mphPrecip: 6%
4:00am
Dew Pt 68°F
SW 3 mphPrecip: 7%
5:00am
Dew Pt 68°F
S 3 mphPrecip: 6%
6:00am
Dew Pt 68°F
S 3 mphPrecip: 5%
7:00am
Dew Pt 68°F
S 3 mphPrecip: 5%
8:00am
Dew Pt 69°F
S 3 mphPrecip: 9%
9:00am
Dew Pt 70°F
SW 3 mphPrecip: 11%
10:00am
Dew Pt 70°F
SW 3 mphPrecip: 12%
11:00am
Dew Pt 70°F
SW 5 mphPrecip: 17%
12:00pm
Dew Pt 70°F
SW 5 mphPrecip: 22%
1:00pm
Dew Pt 70°F
Heat Index: 84°F
SW 5 mphPrecip: 25%
2:00pm
Dew Pt 70°F
Heat Index: 84°F
W 6 mphPrecip: 40%
Rain: 0.08 in
3:00pm
Dew Pt 70°F
Heat Index: 84°F
W 6 mphPrecip: 38%
Rain: 0.08 in
4:00pm
Dew Pt 70°F
Heat Index: 86°F
W 6 mphPrecip: 32%
Rain: 0.07 in
5:00pm
Dew Pt 69°F
Heat Index: 83°F
W 5 mphPrecip: 23%
Rain: 0.05 in
6:00pm
Dew Pt 69°F
W 5 mphPrecip: 17%
Rain: 0.04 in
7:00pm
Dew Pt 69°F
SW 5 mphPrecip: 11%
Rain: 0.02 in
8:00pm
Dew Pt 68°F
W 3 mphPrecip: 3%
9:00pm
Dew Pt 66°F
NW 5 mphPrecip: 2%
10:00pm
Dew Pt 65°F
NW 5 mphPrecip: 2%
11:00pm
Dew Pt 64°F
NW 6 mphPrecip: 1%
12:00am
Dew Pt 62°F
N 6 mphPrecip: 0%
1:00am
Dew Pt 60°F
N 6 mphPrecip: 0%
2:00am
Dew Pt 59°F
N 6 mphPrecip: 0%
3:00am
Dew Pt 57°F
NW 6 mphPrecip: 0%
4:00am
Dew Pt 56°F
N 6 mphPrecip: 0%
5:00am
Dew Pt 54°F
N 6 mphPrecip: 0%
6:00am
Dew Pt 54°F
N 6 mphPrecip: 0%
7:00am
Dew Pt 54°F
N 6 mphPrecip: 0%
8:00am
Dew Pt 55°F
N 6 mphPrecip: 0%
9:00am
Dew Pt 56°F
N 5 mphPrecip: 0%
10:00am
Dew Pt 55°F
N 5 mphPrecip: 0%
11:00am
Dew Pt 55°F
N 3 mphPrecip: 0%
12:00pm
Dew Pt 55°F
N 3 mphPrecip: 0%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 272328
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
728 PM EDT Thu Aug 27 2026
.WHAT HAS CHANGED...
The overall threat for severe weather across southern New England
has decreased. However, a risk for strong to severe storms remains
for areas west of the Connecticut River through this evening.
&&
.KEY MESSAGES...
- A few stronger storms are possible, mainly west of the CT
River Valley today.
- Spot shower or thunderstorm possible Friday, otherwise a
mainly dry and pleasant late-summer day.
- Seasonable temperatures and dry weather this weekend.
- Cloudy and unsettled early to mid next week with several
opportunities for showers and storms, but the timing of them
is uncertain.
&&
.DISCUSSION...
KEY MESSAGE 1...A few stronger storms are possible, mainly west of
the CT River Valley today.
A seasonably warm and humid day is ongoing, helping fuel
thunderstorms from the Mid-Atlantic into the New York City metro.
However, the threat for severe storms across southern New England is
decreasing, albeit not zero. This is highlighted by the current
outlook, which indicates the greatest risk is mainly west of the
Connecticut River Valley, where a Marginal Risk (level 1 out of 5)
exists. The greatest concern is across the Berkshires and points
west, where a Slight Risk (level 2 out of 5) exists. Driving today's
weather is a mid-level closed low over southern Hudson Bay and a
neutral to slightly positively tilted trough. Dynamics are modest,
with 0-6 km bulk shear around 35 kt, CAPE values of 1,000-1,500 J/kg
west of the Connecticut River, and effective helicity of 50-100
m2/s2.
It is a tricky forecast, as there is sufficient instability across
southern New England, with the greatest CAPE values remaining west
of a Willimantic-Worcester-Fitchburg line. However, some high-res
guidance suggests ongoing convection from the Mid-Atlantic into the
NYC metro may work over the environment to our south, limiting the
northward transport of higher instability into southern New England
this afternoon. This could ultimately reduce the amount of
instability available for storms later today. Nevertheless, any
storms that do develop will have the potential for gusty winds,
which remain the primary concern given DCAPE values around 800 J/kg.
Small hail is also possible, and an isolated tornado cannot be ruled
out. We continue to feel the greatest risk for any stronger storms
is west of the Connecticut River Valley.
Today's 12z suite of guidance continues to support storm development
across New York State by mid-afternoon, reaching western New England
between 5-8 PM. The greatest risk for stronger storms will be during
the late afternoon and early evening, primarily west of the
Connecticut River Valley. Farther east, decreasing instability with
the loss of daytime heating, marginal mid-level lapse rates around
5.5-6.5 C/km, and limited moisture should result in a less favorable
environment. A few storms may survive eastward into central and
eastern southern New England, but coverage and intensity should
diminish.
Mild overnight with stratus advecting in from the south, which may
lead to low clouds and areas of fog mainly across RI into
southeastern MA.
KEY MESSAGE 2...Spot shower or thunderstorm possible Friday,
otherwise a mainly dry and pleasant late-summer day.
Clouds early to start Friday, followed by seasonably warm and humid
conditions. A cold front moves across the region during the morning
into early afternoon, providing a focus for isolated to scattered
showers and perhaps a garden-variety thunderstorm. Much of the day
should remain dry, with any shower or thunderstorm activity brief
and localized.
The cold front clears the coast Friday evening, with winds shifting
to the northwest behind it. A more comfortable and less humid air
mass arrives overnight into early Saturday.
KEY MESSAGE 3...Seasonable temperatures and dry weather this
weekend.
Nice weekend shaping up for Southern New England as large high
pressure cell centered over southeast Ontario early Sat shifts
southeastward through Long Island and offshore by Sunday. Expect
full sun and good mixing helping to temper dewpoints/humidity levels
to tolerable levels. Seasonable highs in the upper 70s to low 80s
with good radiational cooling both Sat and Sun nights supporting
lows in the upper 50s to low 60s. Enjoy the weather this weekend as
we turn more active and unsettled starting Monday - more on that to
follow below.
KEY MESSAGE 4...Cloudy and unsettled early to mid next week
with several opportunities for showers and storms, but the
timing of them is uncertain.
Our weather pattern then turns more unsettled starting Monday into
midweek, as the northern mid-Atlantic and Southern New England
remains entrenched between cooler northerly flow over northeast New
England and a strong surge of warm, humid air on southwest flow over
the Ohio Valley and Upper Midwest. Quasi-stationary/backdoor sfc
frontal boundary looks to be draped in vicinity of Southern New
England Monday thru Wednesday, with embedded hard-to-time shortwaves
in a fast NW flow in mid-levels, atop the stalled frontal boundary,
favoring several opportunities for showers and thunderstorms along
its extent.
Other than it being a pattern which favors cloud cover and periods
of showers and storms, given the coarser-resolution ensemble
guidance available at this point, confidence in the timing of
showers/storms is lower than average. The position of the quasi-
stationary front will also affect the timing and placement of where
showers and storms are more favored day-by day; as we move though
time, the initial lean is for the frontal boundary to adjust
southwestward, but will wait to see incoming guidance before
adjusting PoPs beyond NBM. Expect a narrower range in high/low temps
Monday through Wednesday, with highs running a little cooler than
normal and lows slightly milder than normal.
&&
.AVIATION /00Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
00z TAF Update:
Through Tonight...Moderate confidence.
Low risk for TSRA at BDL thru 03z. VFR should otherwise govern
through 03z, although stratus with MVFR-IFR ceilings works its
way from south to north thereafter. South winds around 5-10 kt,
decresing to 5 kt or less overnight.
Friday...High confidence in trends, lower confidence in storm
coverage.
Conditions improve to VFR with ceilings 050-080 after 14-16z. Pop-up
TSRA possible between 18-00z, which may result in brief MVFR/IFR
conditions. Light W/SW winds become WNW by late afternoon.
Friday Night...High confidence.
VFR ceilings for most, though MVFR possible along the immediate
south coasts of RI/MA, Cape Cod, and the Islands. Light NW winds.
KBOS Terminal...Moderate confidence. VFR/dry early tonight.
Stratus looks to return northward late tonight and overnight at
MVFR levels with TEMPO IFR pre-dawn. VFR return early Friday
morning. Possible SHRA/TS Fri aftn between 19z Fri-00z Sat but
confidence too low for TAF mention.
KBDL Terminal...Moderate confidence. Still a low chance for TSRA
before 03z. VFR otherwise then deteriorates to MVFR-IFR ceilings
overnight until early Fri AM.
Outlook /Saturday through Tuesday/...
Saturday through Saturday Night: VFR.
Sunday: VFR. Breezy.
Sunday Night: VFR. Slight chance SHRA.
Monday: VFR. Slight chance SHRA, slight chance TSRA.
Monday Night: VFR. Chance SHRA, slight chance TSRA.
Tuesday: Mainly VFR, with local IFR possible. Slight chance
SHRA, slight chance TSRA.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Friday Night...High confidence.
Chances for showers and thunderstorms increase tonight, mainly south
of the Islands. Southerly winds remain less than 20 kt, with seas 3
to 4 ft across the southern waters and 2 to 3 ft across the eastern
waters. Another round of scattered showers and thunderstorms is
possible nearshore Friday afternoon with the passage of a cold
front. Winds shift to the west behind the front Friday afternoon,
then become northerly Friday night into Saturday morning.
Outlook /Saturday through Tuesday/...
Saturday: Winds less than 25 kt. Seas locally approaching 5 ft.
Saturday Night through Sunday: Winds less than 25 kt.
Sunday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.
Slight chance of rain showers, slight chance of thunderstorms.
Monday Night: Winds less than 25 kt. Chance of rain showers,
slight chance of thunderstorms.
Tuesday: Winds less than 25 kt. Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Loconto/Dooley
AVIATION...Loconto/Dooley
MARINE...Loconto/Dooley
Meta data
Point forecast:
https://api.weather.gov/gridpoints/BOX/65,104/forecast
Zone forecast:
https://api.weather.gov/zones/forecast/MAZ014/forecast
Hourly forecast:
https://api.weather.gov/gridpoints/BOX/65,104/forecast/hourly
Hourly detail:
https://api.weather.gov/gridpoints/BOX/65,104
Point detail:
https://api.weather.gov/points/42.4399,-71.2405
Alerts:
https://api.weather.gov/alerts?status=actual&point=42.4399,-71.2405
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