Lexington, Massachusetts, USA
35.1°F
1.7°C
Cold
Clear
Today: Hi 81 °F
Tonight: Lo 61 °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 Saturday: 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 Sun Jun 28, 2026 10:48am EDT
- Scattered showers this afternoon following morning fog.
- Warming trend takes hold, though could see dangerous heat Wednesday through Friday.
- Risk for showers and thunderstorms mid to late week.
Mostly Sunny then Isolated Rain Showers
Hi 81 °F
Isolated rain showers after 2pm. Mostly sunny, with a high near 81. Northeast wind 2 to 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Partly Cloudy
Lo 61 °F
Partly cloudy, with a low around 61. Southwest wind 2 to 6 mph.
Mostly Sunny
Hi 83 °F
Mostly sunny, with a high near 83. Northeast wind 3 to 7 mph.
Mostly Clear
Lo 64 °F
Mostly clear, with a low around 64. South wind around 6 mph.
Mostly Sunny then Slight Chance Showers And T-Storms
Hi 90 °F
A slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 90. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Chance Showers And T-Storms
Lo 68 °F
A chance of showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southwest wind around 10 mph. Chance of precipitation is 30%.
Slight Chance Showers And T-Storms then Mostly Sunny
Hi 96 °F
A slight chance of showers and thunderstorms before 8am. Mostly sunny, with a high near 96. Southwest wind around 9 mph.
Mostly Clear
Lo 74 °F
Mostly clear, with a low around 74. Southwest wind around 8 mph.
Sunny
Hi 102 °F
Sunny, with a high near 102. West wind 6 to 9 mph.
Mostly Clear
Lo 77 °F
Mostly clear, with a low around 77. West wind 5 to 8 mph.
Sunny then Slight Chance Showers And T-Storms
Hi 100 °F
A slight chance of showers and thunderstorms after 3pm. Sunny, with a high near 100. Northwest wind 5 to 9 mph.
Slight Chance Showers And T-Storms
Lo 72 °F
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and midnight, then a slight chance of showers and thunderstorms between midnight and 2am. Partly cloudy, with a low around 72. North wind around 6 mph. Chance of precipitation is 30%.
Partly Sunny then Chance Showers And T-Storms
Hi 92 °F
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 92. Northeast wind 3 to 8 mph. Chance of precipitation is 50%.
Chance Showers And T-Storms
Lo 67 °F
A chance of showers and thunderstorms before 5am. Mostly cloudy, with a low around 67. Northeast wind around 6 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Sun Jun 28, 2026 10:48am EDT

NE 3 mph
E 5 mph
E 6 mph
E 7 mph
E 7 mph
SE 6 mph
SE 6 mph
SE 5 mph
SE 5 mph
S 2 mph
S 2 mph
S 3 mph
SW 3 mph
SW 2 mph
SW 3 mph
W 3 mph
W 3 mph
NW 3 mph
N 5 mph
N 3 mph
NE 3 mph
NE 3 mph
E 5 mph
E 5 mph
E 6 mph
E 7 mph
E 7 mph
E 7 mph
E 7 mph
SE 6 mph
SE 5 mph
SE 5 mph
SE 3 mph
S 3 mph
S 5 mph
S 5 mph
000
FXUS61 KBOX 281113
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
713 AM EDT Sun Jun 28 2026
.WHAT HAS CHANGED...
No significant changes.
&&
.KEY MESSAGES...
- Scattered showers this afternoon following morning fog.
- Warming trend takes hold, though could see dangerous heat
Wednesday through Friday.
- Risk for showers and thunderstorms mid to late week.
&&
.DISCUSSION...
KEY MESSAGE 1...Scattered showers this afternoon following morning
fog.
Fog this morning that had been lurking over the waters and took hold
over much of the region this morning will likely stick around until
sunrise. Fog recedes, though cloudier skies will take a bit longer
to decrease. High pressure will start to take hold over the region,
keeping winds light. We do remain under some troughing aloft,
though, keeping the chance for some showers in play this afternoon.
The chance for scattered showers over southern New England makes a
return, yet the risk for these becoming thunderstorms remains low
- - much like yesterday. MLCAPE values will remain mostly below
500 J/kg and MUCAPE generally maxes out around 500 J/kg as well. So,
a rumble or two cannot be entirely ruled out, but is unlikely. Highs
today will be mostly in the 80s.
KEY MESSAGE 2...Warming trend takes hold, though could see dangerous
heat Wednesday through Friday.
A strong upper level ridge continues building in from the west to
start the week, which will be a key factor in this week's heat.
Ensembles and deterministic guidance suites are in good agreement
that this ridge will continue into the Ohio Valley to start the work
week, then continuing further east into the northeast CONUS. The
signals for intense heat heading into the middle of the week have
not changed too much from the previous forecast: ensembles continue
to keep the highest probabilities of highs reaching and/or exceeding
100F over urban areas and the river valleys, especially on Thursday.
GEFS probabilities for Thursday afternoon range generally between 20-
40 percent with Canadian ensemble probabilities slightly higher at
30-60 percent. This ensemble is also highlighting the CT River
Valley more aggressively than other aforementioned areas, with some
spots in the range of 60-70 percent. 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 20-23C, and 925 mb
temperatures in the deterministic guidance continue to key in on 25C
temperatures and higher, even to 30C(!). This is all before dew
points and overall moisture are being taken into account. With
ambient temperatures possibly reaching 100F, heat indices could soar
into the triple digits, lending to a Major (3/4) level Heat Risk.
Urban areas, the Merrimack Valley, and the CT River Valley could see
Extreme (4/4) Heat Risk impacts, especially on Thursday.
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 at 20 percent and lower). The other ensembles are
equally pessimistic; GEFS, ECMWF ENS, and the Canadian ensemble all
have probabilities generally higher than 60 percent for temperatures
staying above 70F overnight.
KEY MESSAGE 3...Risk for showers and thunderstorms mid to late week.
As the ridge builds in heading into the middle of the week, a few
shortwaves may track along the eastern edge. Some showers and/or
thunderstorms associated with them may move through the region
Tuesday, briefly bringing a little bit of relief from the heat. Once
the ridge has built up into southern New England for Wednesday and
Thursday, chances for showers and storms drop significantly. Chances
increase for the end of the week as the ridge breaks down. More
refined details will come into the picture as we get closer to both
events.
&&
.AVIATION /12Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12Z TAF Update...
Through this afternoon...High confidence in conditions.
Moderate confidence in timing.
IFR/LIFR ceilings and vsbys slowly improve to VFR after 15Z.
Some uncertainty in timing of improvements for BOS and
Cape/Islands with onshore flow possibly supporting IFR/MVFR
ceilings into the early afternoon.
Tonight...Moderate confidence.
IFR/MVFR returning tonight mostly around SE MA, Cape Cod, and
the Islands. Fog may develop in the river valleys as well. Winds
going light to calm will only help support this.
Monday...High confidence.
VFR. Fog banks near the coasts diminish and ceilings lift. Winds
remain mostly light and steadily shift more southerly from NE heading
into the evening.
KBOS Terminal...Moderate confidence in TAF. Onshore flow may
support lower ceilings around 1000 feet into the early afternoon
hours, but the expectation is for VFR conditions to return by
16-17Z.
KBDL Terminal...High confidence in TAF.
Outlook /Monday Night through Thursday/...
Monday Night: VFR.
Tuesday: VFR. Breezy. Slight chance SHRA, slight chance TSRA.
Tuesday Night: VFR. Breezy. Chance SHRA, slight chance TSRA.
Wednesday through Thursday: VFR. Breezy.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Monday...High confidence.
Fog and/or stratus continues to impact the waters. This should
erode a bit heading into this afternoon, though continued
onshore flow could limit the speed of improvement. Seas will
range from 2-3 ft. Winds remain quite light through Monday and
will generally keep an easterly component to them. Fog may once
again impact the waters tonight, though it should clear the
waters heading into Monday.
Outlook /Monday Night through Thursday/...
Monday Night through Tuesday: Winds less than 25 kt.
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, slight chance of thunderstorms.
Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Seas up to 5 ft.
Wednesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain
showers.
Thursday: Winds less than 25 kt. Areas of seas approaching
5 ft.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Hrencecin
AVIATION...Hrencecin/RM
MARINE...Hrencecin
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 9 Very High
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
Saturday:
0.01 in
June:
1.26 in
2026
1:17pm
36.1°F
High today:
12:00am
25.2°F
Low today:
2:28pm
30.4°F
High Saturday:
7:11am
16.2°F
Low Saturday:
12:00am
25.2°F
Low wind chill today:
7:11am
16.2°F
Low wind chill Saturday:
1:17pm
33.3°F
High dew pt today:
11:56pm
20.7°F
High dew pt Saturday:
None
Wind gust today:
None
Wind gust Saturday:
No alerts/warnings active for Southeast Middlesex County.
First Light:
6:11am
Sunrise:
6:39am
Sunset:
5:19pm
Twilight ends:
5:47pm
Daylight length:
10 hours 39 minutes
Phase:
Waxing Gibbous (82%)
Moon set:
8:18am
Moon rise:
9:38pm