Lexington Weather
Lexington, Massachusetts, USA
- Few Clouds
-
78.4°F / 25.8°C
-
57.7°F
-
49%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
78.4°F
25.8°C
Warm
Few Clouds
Today: Hi 83 °F
Tonight: Lo 57 °F
Dew Point:
57.7°F
Humidity:
49%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Thursday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Today,
Tonight,
&
Saturday
through
Thursday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Fri Aug 14, 2026 6:18am EDT
Overview:
- Seasonable, less humid, and mainly dry conditions today, though an isolated afternoon shower or thunderstorm is possible.
- Dry, seasonable, and comfortable weather continues through the weekend.
- Rain chances return late Sunday into Monday, followed by quieter weather through most of next week.
Today:
Mostly Sunny then Isolated Showers And T-Storms
Hi 83 °F
Isolated showers and thunderstorms between 2pm and 4pm, then scattered showers and thunderstorms. Mostly sunny, with a high near 83. Northwest wind around 9 mph. Chance of precipitation is 30%.
Tonight:
Scattered Showers And T-Storms then Partly Cloudy
Lo 57 °F
Scattered showers and thunderstorms before 7pm. Partly cloudy, with a low around 57. Northwest wind 2 to 7 mph. Chance of precipitation is 30%.
Saturday:
Sunny
Hi 80 °F
Sunny, with a high near 80. Northwest wind 3 to 8 mph.
Saturday Night:
Mostly Clear
Lo 55 °F
Mostly clear, with a low around 55. Northwest wind 2 to 7 mph.
Sunday:
Mostly Sunny
Hi 82 °F
Mostly sunny, with a high near 82. Southwest wind 2 to 8 mph.
Sunday Night:
Showers And T-Storms
Lo 63 °F
Rain showers likely between 8pm and 2am, then showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 9 mph. Chance of precipitation is 90%.
Monday:
Showers And T-Storms
Hi 81 °F
Showers and thunderstorms before 8am, then rain showers likely and patchy fog between 8am and 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 81. Southwest wind around 9 mph. Chance of precipitation is 80%.
Monday Night:
Chance Showers And T-Storms then Partly Cloudy
Lo 62 °F
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 9pm. Partly cloudy, with a low around 62. North wind around 6 mph. Chance of precipitation is 30%.
Tuesday:
Sunny
Hi 83 °F
Sunny, with a high near 83. North wind around 6 mph.
Tuesday Night:
Mostly Clear
Lo 61 °F
Mostly clear, with a low around 61. South wind around 5 mph.
Wednesday:
Sunny
Hi 85 °F
Sunny, with a high near 85. Southwest wind 3 to 7 mph.
Wednesday Night:
Partly Cloudy then Chance Rain Showers
Lo 66 °F
A chance of rain showers after 2am. Partly cloudy, with a low around 66. Southwest wind around 7 mph. Chance of precipitation is 30%.
Thursday:
Chance Rain Showers
Hi 83 °F
A chance of rain showers before 2pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 83. Southwest wind 6 to 9 mph. Chance of precipitation is 40%.
Thursday Night:
Chance Showers And T-Storms
Lo 62 °F
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 62. West wind around 7 mph.
NWS Hourly Forecast -
Today 12pm through Sat 11pm
Issued by:
National Weather Service Boston / Norton, MA
Updated Fri Aug 14, 2026 6:18am EDT
12:00pm
Dew Pt 53°F
NW 9 mphPrecip: 6%
1:00pm
Dew Pt 53°F
NW 9 mphPrecip: 11%
2:00pm
Dew Pt 53°F
NW 9 mphPrecip: 15%
3:00pm
Dew Pt 53°F
NW 9 mphPrecip: 21%
4:00pm
Dew Pt 54°F
W 9 mphPrecip: 26%
5:00pm
Dew Pt 54°F
W 8 mphPrecip: 29%
6:00pm
Dew Pt 55°F
W 7 mphPrecip: 26%
7:00pm
Dew Pt 57°F
W 6 mphPrecip: 20%
8:00pm
Dew Pt 58°F
W 5 mphPrecip: 14%
9:00pm
Dew Pt 58°F
NW 5 mphPrecip: 7%
10:00pm
Dew Pt 58°F
NW 5 mphPrecip: 1%
11:00pm
Dew Pt 57°F
NW 3 mphPrecip: 0%
12:00am
Dew Pt 57°F
NW 3 mphPrecip: 0%
1:00am
Dew Pt 56°F
N 3 mphPrecip: 0%
2:00am
Dew Pt 55°F
N 3 mphPrecip: 0%
3:00am
Dew Pt 54°F
N 3 mphPrecip: 0%
4:00am
Dew Pt 54°F
N 2 mphPrecip: 0%
5:00am
Dew Pt 52°F
N 2 mphPrecip: 0%
6:00am
Dew Pt 52°F
N 3 mphPrecip: 0%
7:00am
Dew Pt 53°F
NW 3 mphPrecip: 0%
8:00am
Dew Pt 53°F
NW 5 mphPrecip: 0%
9:00am
Dew Pt 52°F
NW 6 mphPrecip: 0%
10:00am
Dew Pt 51°F
NW 7 mphPrecip: 0%
11:00am
Dew Pt 50°F
NW 8 mphPrecip: 0%
12:00pm
Dew Pt 50°F
NW 8 mphPrecip: 0%
1:00pm
Dew Pt 50°F
NW 8 mphPrecip: 0%
2:00pm
Dew Pt 48°F
NW 7 mphPrecip: 0%
3:00pm
Dew Pt 49°F
N 8 mphPrecip: 0%
4:00pm
Dew Pt 49°F
N 8 mphPrecip: 0%
5:00pm
Dew Pt 50°F
N 8 mphPrecip: 0%
6:00pm
Dew Pt 51°F
NE 7 mphPrecip: 0%
7:00pm
Dew Pt 52°F
E 6 mphPrecip: 0%
8:00pm
Dew Pt 53°F
E 5 mphPrecip: 0%
9:00pm
Dew Pt 55°F
NE 2 mphPrecip: 0%
10:00pm
Dew Pt 56°F
NW 2 mphPrecip: 0%
11:00pm
Dew Pt 56°F
SW 2 mphPrecip: 0%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 141518
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
1118 AM EDT Fri Aug 14 2026
.WHAT HAS CHANGED...
Overall, little change to the forecast, with increasing confidence
that most of Sunday remains dry before rain chances increase Sunday
night into Monday.
&&
.KEY MESSAGES...
- Seasonable, less humid, and mainly dry conditions today,
though an isolated afternoon shower or thunderstorm is
possible.
- Dry, seasonable, and comfortable weather continues through the
weekend.
- Rain chances return late Sunday into Monday, followed by
quieter weather through most of next week.
&&
.DISCUSSION...
KEY MESSAGE 1...Seasonable, less humid, and mainly dry conditions
today, though an isolated afternoon shower or thunderstorm is
possible.
Overall, not much has changed with today's forecast. If kicking off
the weekend early this Friday, pleasant weather is expected in the
wake of yesterday's cold front. Mainly sunny skies and a well-mixed
boundary layer will allow temperatures to climb into the lower to
middle 80s, with periodic breezy northwest winds. A sea breeze may
develop along Boston's South Shore. Drier air continues to advect
into southern New England, with humidity lowering through the day. A
surface trough dropping south from northern New England this
afternoon may provide enough convergence for an isolated shower or
thunderstorm, though coverage is expected to remain very limited.
Any shower or storm that develops should move through quickly and
remain non-severe.
Despite the pleasant weather, a moderate risk for rip currents is
expected today and Saturday. Those heading to the beach should
remain aware of local conditions and check with lifeguards or beach
staff regarding rip current risks at their specific location.
Clear skies and light winds tonight will support effective
radiational cooling. Lows fall into the 50s across the cooler
outlying locations, while urban centers remain near 60 degrees.
KEY MESSAGE 2...Dry, seasonable, and comfortable weather continues
through the weekend.
Quiet weather is expected this weekend as high pressure originating
from northern Canada settles across the Northeast through the first
half of Sunday. PWATs lower to between 0.5 and 0.7 inches, resulting
in a notably dry airmass with little humidity. Temperatures remain
seasonable, with highs generally ranging from the upper 70s to lower
80s. Another cool night is expected Saturday night with clear skies
and light winds supporting effective radiational cooling. Lows fall
into the lower to middle 50s across the cooler outlying locations,
while urban centers remain near 60 degrees.
High pressure begins to shift offshore Sunday as a low pressure
system approaches from the Great Lakes. Increasing warm air
advection will bring increasing clouds through the afternoon, while
temperatures remain seasonable. Humidity will gradually increase as
dew points rise into the lower 60s.
KEY MESSAGE 3...Rain chances return late Sunday into Monday,
followed by quieter weather through most of next week.
The next opportunity for rainfall arrives during the second half of
Sunday, with the steadiest rain expected Sunday night into early
Monday. There is growing confidence that most, if not all, of the
daylight hours Sunday remain dry. Ensemble guidance generally keeps
the probability of measurable rainfall below 50 percent until around
00-06Z Monday, supporting a later onset to the rainfall.
There remains uncertainty regarding rainfall amounts, however, as
the best forcing is associated with the surface low and differences
in its track make it difficult to determine where the greatest
rainfall will occur. Ensemble guidance continues to depict differing
solutions, with some members keeping the primary low farther north
while others track it closer to or across southern New England.
Regardless of the eventual track, rainfall appears increasingly
likely Sunday night, though uncertainty remains regarding how much
rain will fall.
Global guidance is in agreement that PWATs may exceed 2 inches,
supporting the potential for locally heavy rainfall. The ECMWF EFI
and Shift of Tails for QPF also highlight a signal across northern
New England, while a Marginal Risk (level 1 of 4) for excessive
rainfall remains in place for all of New England, with the exception
of northern Maine. Ensemble guidance continues to show considerable
spread in potential rainfall totals, with the ECMWF ensemble being
the more robust solution and the GFS and CMC ensembles generally
depicting lower totals.
The system appears progressive, with a cold front clearing east of
New England by Monday afternoon or evening. Drier air then advects
in from the northwest, leading to another dry stretch Tuesday
through Wednesday, and possibly into Thursday, as surface high
pressure builds back into the region. Temperatures remain
seasonable, with highs in the lower to middle 80s and tolerable
humidity as dew points remain in the lower 60s. Unsettled conditions
may return late next week.
&&
.AVIATION /15Z FRIDAY THROUGH TUESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
15z TAF Update:
Today: High confidence.
VFR generally governs. SCT low-topped SHRA/TS anticipated to
develop over upstate NY expected to move SE into Southern New
England after 18z through sundown, and these could bring MVFR-
IFR visby, small hail and localized strong wind gusts mainly for
BDL and ORH south and west, with less of a shot at PVD and BOS.
NW winds around 5-10 kt, with occasional sub-20 kt gusts.
Tonight...High confidence.
VFR outside of any widely scattered showers/isolated t-storm
risk that will dissipate by mid evening. Low risk for brief fog
patches toward daybreak in low-lying locations...but if that
would be extremely localized and short-lived.
Saturday...High confidence.
VFR. NW winds 6-12 knots outside sea breezes that will develop
along portions of coast by afternoon.
KBOS Terminal...High confidence in TAF. Main risk for a few
brief showers in the vicinity of the terminal will be after
21z/22z until about 02z. Low risk for a rumble of thunder too.
Odds favor sea breeze remaining offshore this afternoon...but
we do expect one to develop on Sat.
KBDL Terminal...High confidence in TAF. Better chance for TSRA
after 19z thru sundown.
Outlook /Saturday Night through Tuesday/...
Saturday Night: VFR.
Sunday: VFR. Breezy.
Sunday Night: MVFR/IFR conditions possible. Breezy. SHRA,
slight chance TSRA.
Monday: Mainly VFR, with local IFR possible. Breezy. Chance
SHRA, slight chance TSRA.
Monday Night through Tuesday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Saturday...High confidence.
Tranquil boating conditions are expected as high pressure settles in
from the north and remains in place through most of the weekend.
Most, if not all, of this period will remain dry, with only a low
probability of a spot shower this afternoon. Northwest winds early
this morning become southwesterly this afternoon, with wind speeds
generally less than 12 kt and seas between 2 and 3 ft. On Saturday,
wind direction becomes more variable as surface high pressure builds
overhead. Nearshore sea breezes may develop, with winds generally 10
to 15 kt.
Outlook /Saturday Night through Tuesday/...
Saturday Night through Sunday: Winds less than 25 kt.
Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Local rough seas. Chance of rain showers.
Monday: Moderate risk for Small Craft Advisory winds with local
gusts up to 30 kt. Areas of rough seas. Rain showers likely,
slight chance of thunderstorms.
Monday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Slight chance of rain showers.
Tuesday: Winds less than 25 kt.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Dooley
AVIATION...Frank/Loconto
MARINE...Dooley
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: 7 High
Current (Estimated): 7 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
Thursday:
1.46 in
August:
19.12 in
2026
Daily Extremes [‒] Daily Extremes [+]
12:45pm
79.5°F
High today:
7:01am
64.2°F
Low today:
3:28pm
82.4°F
High Thursday:
6:32am
68.4°F
Low Thursday:
12:35pm
62.1°F
High dew pt today:
10:53am
67.8°F
High dew pt Thursday:
1:54pm
83.9°F
High heat index Thursday:
10:45am
4 mph
Wind gust today:
4:49am
9 mph
Wind gust Thursday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
5:21am
Sunrise:
5:51am
Sunset:
7:48pm
Twilight ends:
8:18pm
Daylight length:
13 hours 57 minutes
Phase:
Waxing Crescent (5%)
Moon rise:
7:59am
Moon set:
8:43pm
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