Lexington Weather
Lexington, Massachusetts, USA
- Clear
-
83.7°F / 28.7°C
-
61.9°F
- 84.4°F
-
48%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
83.7°F
28.7°C
Feels like 84.4°F
Hot
Clear
Today: Hi 84 °F
Tonight: Lo 64 °F
Dew Point:
61.9°F
Humidity:
48%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Sunday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Alerts / Advisories [‒] Alerts / Advisories [+]
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Today,
Tonight,
&
Tuesday
through
Sunday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Mon Jun 29, 2026 4:38am EDT
Overview:
- Warming trend takes hold. Confidence continues to increase in dangerous heat Wednesday through Friday.
- Showers and thunderstorms possible mid to late week.
Today:
Sunny
Hi 84 °F
Sunny, with a high near 84. Northeast wind around 7 mph.
Tonight:
Mostly Clear
Lo 64 °F
Mostly clear, with a low around 64. South wind 3 to 7 mph.
Tuesday:
Mostly Sunny
Hi 90 °F
Mostly sunny, with a high near 90. Southwest wind 5 to 9 mph.
Tuesday Night:
Chance Rain Showers
Lo 69 °F
A chance of rain showers after 7pm. Mostly cloudy, with a low around 69. Southwest wind around 9 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Wednesday:
Chance Rain Showers then Mostly Sunny
Hi 97 °F
A chance of rain showers before 9am. Mostly sunny, with a high near 97. Southwest wind around 9 mph. Chance of precipitation is 40%.
Wednesday Night:
Slight Chance Rain Showers
Lo 75 °F
A slight chance of rain showers between 7pm and 1am. Partly cloudy, with a low around 75. Southwest wind around 7 mph. Chance of precipitation is 20%.
Thursday:
Sunny
Hi 102 °F
Sunny, with a high near 102. West wind 6 to 9 mph.
Thursday Night:
Mostly Clear
Lo 79 °F
Mostly clear, with a low around 79. West wind 5 to 8 mph.
Friday:
Mostly Sunny then Chance Showers And T-Storms
Hi 100 °F
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 100. West wind 5 to 10 mph. Chance of precipitation is 30%.
Friday Night:
Chance Showers And T-Storms
Lo 73 °F
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. West wind 3 to 8 mph. Chance of precipitation is 30%.
Independence Day:
Mostly Sunny then Chance Showers And T-Storms
Hi 93 °F
A slight chance of rain showers between noon and 2pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 93. West wind 3 to 8 mph. Chance of precipitation is 40%.
Saturday Night:
Chance Showers And T-Storms
Lo 69 °F
A chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 10pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Southwest wind around 6 mph. Chance of precipitation is 40%.
Sunday:
Chance Showers And T-Storms
Hi 88 °F
A slight chance of rain showers before 8am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 88. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.
Sunday Night:
Chance Showers And T-Storms
Lo 66 °F
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Northeast wind 3 to 7 mph.
NWS Hourly Forecast -
Today 12pm through Tue 11pm
Issued by:
National Weather Service Boston / Norton, MA
Updated Mon Jun 29, 2026 4:38am EDT
12:00pm
Dew Pt 62°F
Heat Index: 82°F
NE 5 mphPrecip: 0%
1:00pm
Dew Pt 62°F
Heat Index: 82°F
NE 5 mphPrecip: 0%
2:00pm
Dew Pt 61°F
Heat Index: 82°F
E 6 mphPrecip: 0%
3:00pm
Dew Pt 62°F
Heat Index: 82°F
E 7 mphPrecip: 1%
4:00pm
Dew Pt 61°F
Heat Index: 81°F
E 7 mphPrecip: 1%
5:00pm
Dew Pt 61°F
Heat Index: 81°F
E 7 mphPrecip: 0%
6:00pm
Dew Pt 60°F
E 7 mphPrecip: 0%
7:00pm
Dew Pt 60°F
E 6 mphPrecip: 0%
8:00pm
Dew Pt 60°F
SE 5 mphPrecip: 0%
9:00pm
Dew Pt 60°F
SE 5 mphPrecip: 0%
10:00pm
Dew Pt 60°F
S 3 mphPrecip: 0%
11:00pm
Dew Pt 61°F
S 5 mphPrecip: 0%
12:00am
Dew Pt 61°F
S 5 mphPrecip: 0%
1:00am
Dew Pt 60°F
S 5 mphPrecip: 0%
2:00am
Dew Pt 60°F
S 5 mphPrecip: 0%
3:00am
Dew Pt 59°F
SW 5 mphPrecip: 0%
4:00am
Dew Pt 59°F
SW 5 mphPrecip: 0%
5:00am
Dew Pt 59°F
SW 6 mphPrecip: 0%
6:00am
Dew Pt 59°F
SW 6 mphPrecip: 0%
7:00am
Dew Pt 61°F
SW 6 mphPrecip: 1%
8:00am
Dew Pt 62°F
SW 5 mphPrecip: 1%
9:00am
Dew Pt 63°F
SW 5 mphPrecip: 1%
10:00am
Dew Pt 65°F
Heat Index: 83°F
SW 5 mphPrecip: 0%
11:00am
Dew Pt 66°F
Heat Index: 86°F
SW 6 mphPrecip: 0%
12:00pm
Dew Pt 65°F
Heat Index: 88°F
SW 7 mphPrecip: 1%
1:00pm
Dew Pt 65°F
Heat Index: 89°F
SW 7 mphPrecip: 1%
2:00pm
Dew Pt 65°F
Heat Index: 90°F
SW 8 mphPrecip: 5%
3:00pm
Dew Pt 65°F
Heat Index: 90°F
SW 8 mphPrecip: 2%
4:00pm
Dew Pt 66°F
Heat Index: 90°F
SW 8 mphPrecip: 2%
5:00pm
Dew Pt 67°F
Heat Index: 90°F
SW 9 mphPrecip: 5%
6:00pm
Dew Pt 67°F
Heat Index: 88°F
SW 9 mphPrecip: 13%
7:00pm
Dew Pt 66°F
Heat Index: 85°F
SW 9 mphPrecip: 16%
Rain: 0.01 in
8:00pm
Dew Pt 66°F
Heat Index: 82°F
SW 9 mphPrecip: 19%
9:00pm
Dew Pt 65°F
SW 8 mphPrecip: 24%
10:00pm
Dew Pt 64°F
SW 8 mphPrecip: 29%
11:00pm
Dew Pt 63°F
SW 8 mphPrecip: 35%
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 291117
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
717 AM EDT Mon Jun 29 2026
.WHAT HAS CHANGED...
No significant changes.
&&
.KEY MESSAGES...
- Warming trend takes hold. Confidence continues to increase in
dangerous heat Wednesday through Friday.
- Showers and thunderstorms possible mid to late week.
&&
.DISCUSSION...
KEY MESSAGE 1...Warming trend takes hold. Confidence continues to
increase in dangerous heat Wednesday through Friday.
Morning fog that developed along the south coast and parts of the
Cape (plus Martha's Vineyard) should erode away after sunrise this
morning. High pressure continues to exert its influence over the
region ahead of a strengthening upper level ridge to our west. Highs
today climb into the mid to upper 80s for most, staying a bit cooler
towards the coasts and over the Cape and Islands.
Not much has changed in the overall trends of the forecast
overnight. A strong upper level ridge continues building in from the
west, shifting over the northeast CONUS late this week. Ensembles
remain in strong agreement that we will see temperatures over 90-95
starting Wednesday and continuing through the rest of the week. The
highest probabilities of temperatures reaching and/or exceeding 100F
over urban areas and the river valleys, especially on Thursday, also
continue to increase. GEFS probabilities of 100F+ for Thursday
afternoon range now reach up to 60-70 percent with Canadian ensemble
probabilities peaking slightly higher at up to 80 percent. All
ensembles are in pretty good agreement having the highest
probabilities in the CT Valley and towards the Boston metro up into
the Merrimack Valley. The continued overall consensus across the
different guidance suite aids in increasing confidence in the risk
for this dangerous heat overall. Mean 850 mb temperatures across the
ensembles continue to reach 20-24C during this stretch, and 925 mb
temperatures in the deterministic guidance continue to key in on 25C
temperatures and higher, even to 30C. Notably, the GFS has the
highest 925 mb temperatures centered over CT and eastern MA. This is
all before dew points and overall moisture are being taken into
account. Considering dew points are expected to be in the upper 60s
and even into the low 70s, heat indices to 110F are not out of the
question for some areas. An Extreme Heat Watch will be in effect
from Wednesday morning through Friday evening for this reason, along
with limited overnight temperature recovery. Major (3/4) to Extreme
(4/4) HeatRisk impacts are very possible, with the Extreme impacts
more likely over urban areas and in river valleys.
As briefly highlighted above, another issue with these high daytime
temperatures is that not much relief is expected overnight. NBM has
low probabilities for temperatures getting below 70F overnight
between Wednesday and Friday, generally below 10 percent across much
of southern New England. It also has probabilities between 75-90
percent for early Thursday morning and early Friday morning
temperatures in eastern MA (especially Boston) remaining above 75F
from overnight. The other ensembles are equally pessimistic with
recovery; GEFS, ECMWF ENS, and the Canadian ensemble are all
essentially showing maximum probabilities that the region stays at
or above 70F overnight between Wednesday and Friday night.
KEY MESSAGE 2...Showers and thunderstorms possible mid to late week.
Shortwaves originating from a disturbance in central Canada will
track eastward and may impact southern New England before the upper
level ridge fully builds up over the region. These waves will track
along the eastern periphery, with one likely arriving Tuesday night
and another arriving once the ridge starts breaking down towards the
end of the week. Showers and storms are a possibility Tuesday night,
and some guidance is hinting at increased instability overnight that
could fuel any storms that do develop. CSU ML probs and other
guidance aren't showing much in the way of a severe signal at this
time, but we will continue to monitor for any risk that could
develop. With the ridge fully build up over the region Wednesday and
Thursday, chances for any showers or storms drop significantly.
Chances return as the ridge breaks down towards the end of the week,
and the risk for severe weather could be higher towards Friday and
Saturday. CIPS analogs are hinting at it particularly for western
and central MA. More refined details will come into the picture as
we get closer to both events.
&&
.AVIATION /12Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12Z TAF Update:
Today...High confidence.
Most areas have lifted to VFR, with some scattered areas of
BCFG lingering thru 13z along the south coast/Cape/Island
terminals. Light winds, with seabreezes developing at BOS by 15z
and PVD by 16-18z. Though, BOS could see onshore winds as early
as 12-13z.
Tonight...High confidence.
IFR likely to return with fog overnight across SE MA, RI, CT,
and the Cape and Islands. Winds mostly S, remaining light and
going calm from time to time.
Tuesday...High confidence.
VFR. Winds pick up in the afternoon from the SSW, gusting to 20
kt across much of SE MA, RI, and CT. Showers possible towards
the late evening hours.
KBOS Terminal...High Confidence in TAF.
KBDL Terminal...High Confidence in TAF.
Outlook /Tuesday Night through Friday/...
Tuesday Night: VFR. Breezy. Chance SHRA.
Wednesday through Wednesday Night: VFR. Breezy. Slight chance
SHRA.
Thursday through Thursday Night: VFR. Breezy.
Friday: VFR. Breezy. 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 Tuesday: High confidence.
Winds and seas remain below small craft advisory thresholds,
with light east/southeast winds through tonight and seas 3 ft
or less all waters. Winds near shore/port today could turn east
around 10 kt due to sea/bay breezes. Fog that erodes through the
day today may make a return tonight. Winds Tuesday could gust to
25 kt occasionally in the afternoon over the southern coastal
and eastern outer waters.
Outlook /Tuesday Night through Friday/...
Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft. Chance of
rain showers.
Wednesday: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain
showers.
Wednesday Night: Moderate risk for Small Craft Advisory winds
with gusts up to 25 kt. Seas up to 5 ft. Chance of rain
showers.
Thursday: Low risk for Small Craft Advisory winds with gusts up
to 20 kt. Areas of seas approaching 5 ft.
Thursday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft.
Friday: Winds less than 25 kt. Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Extreme Heat Watch from Wednesday morning through Friday
evening for CTZ002>004.
MA...Extreme Heat Watch from Wednesday morning through Friday
evening for MAZ002>021-026.
RI...Extreme Heat Watch from Wednesday morning through Friday
evening for RIZ001>007.
MARINE...None.
&&
$$
DISCUSSION...Hrencecin
AVIATION...McMinn
MARINE...Hrencecin
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: 9 Very High
Current (Estimated): 8 Very 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
Sunday:
1.94 in
June:
11.82 in
2026
51.1 in
Season Snow:
Daily Extremes [‒] Daily Extremes [+]
12:33pm
83.8°F
High today:
5:50am
64.2°F
Low today:
1:44pm
81.3°F
High Sunday:
4:18am
63.1°F
Low Sunday:
9:36am
67.8°F
High dew pt today:
1:19pm
70.3°F
High dew pt Sunday:
12:33pm
85.6°F
High heat index today:
1:43pm
84.7°F
High heat index Sunday:
10:47am
2 mph
Wind gust today:
9:20pm
9 mph
Wind gust Sunday:
Sun / Moon [‒] Sun / Moon [+]
First Light:
4:36am
Sunrise:
5:11am
Sunset:
8:26pm
Twilight ends:
9:01pm
Daylight length:
15 hours 15 minutes
Phase:
Full Moon (100%)
Moon set:
4:20am
Moon rise:
8:43pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
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