Lexington, Massachusetts, USA
81.0°F
27.2°C
Feels like 84°F
Hot
Clear
Tonight: Lo 69 °F
Tuesday: Hi 88 °F
Dew Point:
68.9°F
Humidity:
67%
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: 1 mph
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Mon Aug 10, 2026 5:25pm EDT
- Above normal temperatures and humidity continues through Tuesday. Relief from the heat & humidity comes late week and especially this weekend.
- Unsettled weather continues this week with shower and thunderstorms chances returning this evening as well as Wednesday night/Thursday morning.
Partly Cloudy
Lo 69 °F
Partly cloudy, with a low around 69. Southwest wind around 6 mph.
Sunny
Hi 88 °F
Sunny, with a high near 88. West wind 6 to 10 mph.
Partly Cloudy
Lo 64 °F
Partly cloudy, with a low around 64. West wind 3 to 8 mph.
Sunny
Hi 86 °F
Sunny, with a high near 86. Northwest wind around 5 mph.
Partly Cloudy
Lo 64 °F
Partly cloudy, with a low around 64. West wind around 5 mph.
Chance Rain Showers
Hi 85 °F
A chance of rain showers after 8am. Partly sunny, with a high near 85. West wind 3 to 9 mph. Chance of precipitation is 50%.
Chance Rain Showers
Lo 63 °F
A chance of rain showers. Mostly cloudy, with a low around 63. West wind 5 to 8 mph. Chance of precipitation is 40%.
Slight Chance Rain Showers then Mostly Sunny
Hi 81 °F
A slight chance of rain showers before 9am. Mostly sunny, with a high near 81. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Mostly Clear
Lo 58 °F
Mostly clear, with a low around 58. Northwest wind around 9 mph.
Sunny
Hi 81 °F
Sunny, with a high near 81. Northwest wind around 8 mph.
Mostly Clear
Lo 57 °F
Mostly clear, with a low around 57. Northwest wind around 6 mph.
Mostly Sunny then Slight Chance Rain Showers
Hi 81 °F
A slight chance of rain showers after 5pm. Mostly sunny, with a high near 81. Southwest wind 2 to 6 mph.
Chance Rain Showers
Lo 61 °F
A chance of rain showers. Mostly cloudy, with a low around 61. South wind around 6 mph. Chance of precipitation is 40%.
Chance Rain Showers
Hi 80 °F
A chance of rain showers. Partly sunny, with a high near 80. West wind 5 to 8 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Mon Aug 10, 2026 5:25pm EDT

SW 6 mph
SW 5 mph
SW 5 mph
SW 5 mph
SW 5 mph
SW 5 mph
SW 5 mph
SW 5 mph
SW 5 mph
W 5 mph
W 5 mph
W 5 mph
W 6 mph
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W 9 mph
W 9 mph
NW 9 mph
W 9 mph
W 10 mph
W 9 mph
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W 5 mph
NW 5 mph
NW 3 mph
NW 3 mph
W 3 mph
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000
FXUS61 KBOX 101847
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
247 PM EDT Mon Aug 10 2026
.WHAT HAS CHANGED...
Forecast remains on track.
&&
.KEY MESSAGES...
- Above normal temperatures and humidity continues through
Tuesday. Relief from the heat & humidity comes late week and
especially this weekend.
- Unsettled weather continues this week with shower and
thunderstorms chances returning this evening as well as Wednesday
night/Thursday morning.
&&
.DISCUSSION...
KEY MESSAGE 1...Above normal temperatures and humidity
continues through Tuesday. Relief from the heat & humidity comes
late week and especially this weekend.
A bit of a persistence temperature forecast to start the week as the
pattern is overall pretty zonal. Model soundings indicate mixing up
to near 850 mb where temperatures are/will be hovering around 16C
resulting in highs in the upper 80s, perhaps touching 90s in the
warmest spots today and Tuesday. We'll then see a gradual cooling
down through the work week and especially by the weekend. 850 mb
temps drop to near 13C by mid week leading to highs in the upper 70s
(high elevations) to mid 80s. The weekend, though, looks quite
comfortable as dewpoints which will be elevated at times through the
week but never oppressive, really drop by the weekend into the upper
40s to low 50s! This leads to the chance for some cooler nights in
the 50s while afternoon temps may not make it out of the 70s for
many locations.
KEY MESSAGE 2...Unsettled weather continues this week with shower
and thunderstorms chances returning this evening, as well as
some time from late Wednesday night into Thursday night.
Looking at a rather narrow time window for thunderstorms this
afternoon, pretty much from 5-9 PM. Most-unstable CAPE values peak
about 750-1,100 J/kg during this time, then quickly diminish after
sunset. There is just not enough synoptic forcing to maintain it
much longer. While a few thunderstorms are possible after sunset,
they should be weakening as they move across southern New England,
especially by the time they reach eastern MA. Anticipating the
majority of the stronger convection over PA and NY state to remain
mainly to our south and west. Will continue to monitor this though
as it could remain somewhat as potent moving into the CT River
valley.
Tuesday and Wednesday should remain dry and mostly sunny with more
comfortable humidity.
Complicated forecast from late Wednesday night into Thursday night.
Expecting a frontal boundary to meander across southern New England.
Thus, the timing is not well known. This front should provide a
trigger for some showers at times, but it should not be a washout. A
high pressure should finally get close enough on Friday to push this
front offshore, and return drier and cooler weather into early next
week.
&&
.AVIATION /18Z MONDAY THROUGH SATURDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update:
This afternoon: Generally high confidence, but moderate
confidence on timing/probability of TSRA.
VFR with hazy skies from high level smoke possible. Winds SW
5-10 kts. SHRA/TSRA look to develop late in the day, starting as
soon as 21z at BDL with the higher risk after 23Z. Confidence
decreases in TSRA as the activity moves E/ESE toward ORH and
further east terminals (00-05Z).
Tonight: High confidence.
VFR. Sea breeze at BOS kicks out 23-01Z with winds shifting to
SW. SW winds 5-10 kts shift to WSW/W overnight.
Tuesday: High confidence.
VFR. NW winds 10-15 kts.
Tuesday night:High confidence.
VFR. Winds light and variable.
KBOS Terminal...Moderate confidence in TAF.
Low probability for a SHRA/TSRA after 01-06Z. Too low to
include in TAF at this time.
KBDL Terminal...Moderate confidence in TAF. Wildfire smoke aloft possible.
Potential for scattered SHRA or a TSRA after 21z, but moreso
after 23Z. If any storms develop, a stronger storm is possible
with gusty winds, frequent lighting, and brief IFR visbys.
Outlook /Tuesday Night through Saturday/...
Wednesday through Wednesday Night: VFR.
Thursday: VFR. Breezy. Chance SHRA.
Thursday Night: Mainly VFR, with local IFR possible. Chance
SHRA.
Friday through Friday Night: VFR. Breezy.
Saturday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Tuesday night... High Confidence.
Winds becoming SW 10-15 kts. Becoming W after 06z. Local sea
breezes along the east coast of MA Monday. Seas 1 to 3 feet.
Outlook /Wednesday through Saturday/...
Wednesday through Wednesday Night: Winds less than 25 kt.
Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
Slight chance of rain showers.
Thursday Night: Winds less than 25 kt. Areas of seas
approaching 5 ft. Chance of rain showers.
Friday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
Friday Night: Winds less than 25 kt. Areas of seas approaching
5 ft.
Saturday: Winds less than 25 kt. Seas locally approaching 5 ft.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...None.
&&
$$
DISCUSSION...Belk/BW
AVIATION...Belk/BW
MARINE...Belk/BW
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 6 High
Current (Estimated): 1 Low
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:
1.46 in
August:
19.12 in
2026
2:59pm
84.4°F
High today:
6:42am
67.5°F
Low today:
2:19pm
87.3°F
High Sunday:
4:58am
70.3°F
Low Sunday:
12:13pm
70.9°F
High dew pt today:
11:50am
74.3°F
High dew pt Sunday:
2:30pm
87.5°F
High heat index today:
1:31pm
94.9°F
High heat index Sunday:
1:52pm
4 mph
Wind gust today:
2:26pm
7 mph
Wind gust Sunday:
No alerts/warnings active for Southeast Middlesex County.
First Light:
5:16am
Sunrise:
5:47am
Sunset:
7:54pm
Twilight ends:
8:24pm
Daylight length:
14 hours 7 minutes
Phase:
Waning Crescent (5%)
Moon rise:
2:45am
Moon set:
6:49pm