Lexington Weather
Lexington, Massachusetts, USA
- Clear
- 51.3°F / 10.7°C
-
46.0°F
-
82%
- Calm, 10-min avg: Calm, gust: None
- 10 miles
- 0.00 in
Current Conditions [‒] Current Conditions [+]
51.3°F
10.7°C
Cool
Clear
Today: Hi 65 °F
Tonight: Lo 47 °F
Dew Point:
46.0°F
Humidity:
82%
Barometer:
mb
Rain Rate: 0.00 in/hr
Rain Today: 0.00 in
Rain Friday: 0.00 in
Visibility: 10 miles
Wind:
Now: Calm
Avg: Calm
Gusts: 0 mph
Forecast [‒] Forecast [+]
NWS Weather Forecast -
Today,
Tonight,
&
Sunday
through
Friday Night
Issued by:
National Weather Service Boston / Norton, MA
Point Forecast Updated Sat Sep 19, 2026 7:40am EDT
Overview:
- Dry with fall-like temperatures today and tonight.
- Rain likely Sunday into Monday, although there still remains uncertainty in the exact amounts. Showers may linger through early next week. A coastal system is possible late week.
Today:
Mostly Sunny
Hi 65 °F
Mostly sunny, with a high near 65. Northeast wind around 5 mph.
Tonight:
Partly Cloudy
Lo 47 °F
Partly cloudy, with a low around 47. South wind 1 to 5 mph.
Sunday:
Mostly Cloudy then Rain Showers
Hi 63 °F
Rain showers between 1pm and 4pm, then rain showers and patchy fog. Mostly cloudy, with a high near 63. Southeast wind 2 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
Sunday Night:
Rain Showers
Lo 51 °F
Rain showers before 7pm, then rain showers and patchy fog. Cloudy, with a low around 51. Northeast wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday:
Partly Sunny
Hi 65 °F
Partly sunny, with a high near 65. Northeast wind 6 to 9 mph.
Monday Night:
Mostly Cloudy
Lo 48 °F
Mostly cloudy, with a low around 48. Northeast wind 2 to 7 mph.
Tuesday:
Partly Sunny
Hi 61 °F
Partly sunny, with a high near 61. Northeast wind around 9 mph.
Tuesday Night:
Mostly Cloudy
Lo 47 °F
Mostly cloudy, with a low around 47. Northeast wind 5 to 8 mph.
Wednesday:
Partly Sunny
Hi 62 °F
Partly sunny, with a high near 62. Northeast wind 8 to 14 mph, with gusts as high as 29 mph.
Wednesday Night:
Mostly Cloudy then Slight Chance Rain Showers
Lo 47 °F
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 47. Northeast wind 6 to 10 mph.
Thursday:
Chance Rain Showers
Hi 61 °F
A chance of rain showers. Mostly cloudy, with a high near 61. Northeast wind 9 to 13 mph, with gusts as high as 28 mph. Chance of precipitation is 30%.
Thursday Night:
Chance Rain Showers
Lo 48 °F
A chance of rain showers. Mostly cloudy, with a low around 48. Northeast wind 10 to 14 mph. Chance of precipitation is 40%.
Friday:
Chance Rain Showers
Hi 62 °F
A chance of rain showers. Partly sunny, with a high near 62. North wind around 14 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Friday Night:
Chance Rain Showers
Lo 49 °F
A chance of rain showers. Mostly cloudy, with a low around 49. Northeast wind 10 to 14 mph, with gusts as high as 26 mph.
NWS Hourly Forecast -
Today 8am through Sun 7pm
Issued by:
National Weather Service Boston / Norton, MA
Updated Sat Sep 19, 2026 7:18am EDT
8:00am
Dew Pt 42°F
N 5 mphPrecip: 0%
9:00am
Dew Pt 42°F
N 5 mphPrecip: 0%
10:00am
Dew Pt 42°F
NE 5 mphPrecip: 0%
11:00am
Dew Pt 41°F
NE 5 mphPrecip: 0%
12:00pm
Dew Pt 41°F
NE 5 mphPrecip: 0%
1:00pm
Dew Pt 41°F
NE 3 mphPrecip: 0%
2:00pm
Dew Pt 41°F
E 3 mphPrecip: 0%
3:00pm
Dew Pt 42°F
E 3 mphPrecip: 0%
4:00pm
Dew Pt 43°F
SE 5 mphPrecip: 0%
5:00pm
Dew Pt 43°F
SE 5 mphPrecip: 0%
6:00pm
Dew Pt 44°F
SE 5 mphPrecip: 0%
7:00pm
Dew Pt 44°F
SE 5 mphPrecip: 0%
8:00pm
Dew Pt 44°F
SE 5 mphPrecip: 0%
9:00pm
Dew Pt 44°F
SE 3 mphPrecip: 0%
10:00pm
Dew Pt 44°F
S 3 mphPrecip: 0%
11:00pm
Dew Pt 44°F
S 3 mphPrecip: 0%
12:00am
Dew Pt 44°F
S 2 mphPrecip: 0%
1:00am
Dew Pt 44°F
S 2 mphPrecip: 0%
2:00am
Dew Pt 44°F
S 2 mphPrecip: 0%
3:00am
Dew Pt 44°F
SW 2 mphPrecip: 0%
4:00am
Dew Pt 44°F
S 1 mphPrecip: 0%
5:00am
Dew Pt 44°F
S 1 mphPrecip: 0%
6:00am
Dew Pt 45°F
SE 2 mphPrecip: 0%
7:00am
Dew Pt 46°F
SE 2 mphPrecip: 0%
8:00am
Dew Pt 47°F
SE 3 mphPrecip: 5%
9:00am
Dew Pt 48°F
SE 3 mphPrecip: 6%
10:00am
Dew Pt 49°F
SE 5 mphPrecip: 6%
11:00am
Dew Pt 50°F
SE 6 mphPrecip: 7%
12:00pm
Dew Pt 51°F
SE 6 mphPrecip: 28%
1:00pm
Dew Pt 52°F
SE 6 mphPrecip: 49%
2:00pm
Dew Pt 53°F
SE 6 mphPrecip: 70%
Rain: 0.04 in
3:00pm
Dew Pt 55°F
SE 6 mphPrecip: 75%
Rain: 0.04 in
4:00pm
Dew Pt 56°F
SE 6 mphPrecip: 79%
Rain: 0.05 in
5:00pm
Dew Pt 56°F
E 6 mphPrecip: 83%
Rain: 0.05 in
6:00pm
Dew Pt 56°F
E 5 mphPrecip: 82%
Rain: 0.05 in
7:00pm
Dew Pt 57°F
E 5 mphPrecip: 81%
Rain: 0.05 in
FORECAST DISCUSSION
Area Forecast Discussion
for Boston / Norton, MA
000
FXUS61 KBOX 191109
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
709 AM EDT Sat Sep 19 2026
.WHAT HAS CHANGED...
No significant changes.
&&
.KEY MESSAGES...
- Dry with fall-like temperatures today and tonight.
- Rain likely Sunday into Monday, although there still remains
uncertainty in the exact amounts. Showers may linger through
early next week. A coastal system is possible late week.
&&
.DISCUSSION...
KEY MESSAGE 1...Dry with fall-like temperatures today and
tonight.
A cooler airmass settles over the region early this morning
resulting a cool start to the day today with temperatures in the 40s
and 50s this morning. Expect dry conditions today with surface high
pressure in place. The cooler airmass stays put with 850mb
temperatures 6-9C. This will support fall-like temperatures in the
mid 60s for most, flirting with 70 in the CT Valley. Northeast flow
with likely keep the immediate eastern coastal areas cooler in the
low 60s. Tonight, high pressure begins to shift offshore as our next
system approaches from the west. With cloud cover not increasing
until sunrise, there should be enough of a window with clear skies
and light winds to support efficient cooling tonight. Temperatures
likely fall into the 40s for a good part of southern New England. CT
and RI may end up a little warmer as WAA begins to push in after
2AM which would limit their window of cooling.
The extended period of NE winds will help develop a swell with
longer wave periods across the eastern waters for today. This will
increase the risk for rip currents for the east-facing beaches
including Nantucket today. If you plan on heading to the beach
despite the cooler temperatures, please use caution.
KEY MESSAGE 2...Rain likely Sunday into Monday, although there
still remains uncertainty in the exact amounts. Showers may
linger through early next week. A coastal system is possible
late week.
Model guidance continues to stay in general agreement to support
rainfall Sunday into Monday. A shortwave approaches from the
northwest coupled with an 850mb jet positioning over southern New
England allow advection of moisture from the south and increased
lift. PWATS increase to 1.2-1.8", around 160-180 percent of normal.
A low pressure system tracks east from the Great Lakes region Sunday
putting southern New England in the warm sector as its warm front
shifts northward. With its cold front trailing from the west, this
should provide sufficient convergence for widespread rainfall. Model
guidance has consistently been indicating lacking instability with
this system which would likely limit the rain rates and thus limit
the threat for heavy rain and flash flooding. There is still some
spread in expected totals liking owing to track differences,
but ensembles show a more likely range of a few tenths to around
1 inch. Some solutions such as the ECMWF/ensemble indicate
potential for greater than 1.0" with ensemble probabilities of
20-50% along the east slope of the Berkshires. Other solutions
lean lighter with amounts 0.25-0.50". 3 and 6 hour QPF doesn't
approach FFG, but some pockets of moderate or very brief heavy
rain are possible. In terms of timing, rain likely spreads from
west to east Sunday morning with widespread rain arriving by the
afternoon. Rain continues overnight into Monday.
How long the rain lingers Monday will depend on how progressive the
system/front is. There are difference across guidance in the speed
which has led to some uncertainty in how long showers linger around
on Monday. If showers were to linger, it would more likely effect
areas more south and east (Cape/Islands or south coast). Fall-like
temperatures are likely behind the front on Monday with breezy
northerly winds. There is potential for another system to brush
southern New England Tuesday bringing showers; however, this is
lower probability as there lacking agreement with how north this
system tracks at this time.
There is good agreement across model guidance with a fairly strong
surface high shifting over Quebec Tuesday into mid-week. This will
keep a cooler than normal airmass over the northeast supporting cool
more fall-like temperatures continuing through the week.
Deterministic and ensemble guidance continues to hint at the
potential for a coastal low pressure system sometime Thursday into
Friday. However, there is still a fair amount of uncertainty in the
details of the pattern that will influence the track of this low.
Some solutions feature a low track closer to southern New England
while others well off shore. Pretty low confidence at point, but
warrants monitoring as it would bring potential for stronger winds,
rough seas for the coastal waters and potentially another round of
rainfall.
&&
.AVIATION /12Z SATURDAY THROUGH WEDNESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12Z TAF Update:
Today...High confidence.
VFR. Light NE winds becoming E/ESE in the afternoon, except for
occasional 20 kt gusts in the morning across the Cape and
Islands. These are expected to drop off through the day today.
Tonight...High confidence.
VFR. Winds shift to the S in the evening less than 10 kts. Some
areas may go calm.
Sunday...Moderate confidence.
VFR to start, diminishing to MVFR and IFR in the afternoon as
rain moves into the region. LLWS could be a concern after 18z
as this system pushes through. Winds generally SE at 5-10 kt
towards the surface. Chances for TS are low to near zero.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Sunday Night through Wednesday/...
Sunday Night: MVFR/IFR conditions possible. Breezy. SHRA.
Monday: Mainly VFR, with local MVFR possible. Breezy.
Monday Night through Tuesday: VFR. Breezy.
Tuesday Night: VFR. Windy with local gusts up to 35 kt.
Wednesday: VFR. Strong winds with local gusts up to 40 kt.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Sunday...High confidence.
As high pressure builds into Quebec tonight, expect a period of
N wind gusts 20-25 kts through mid to late morning. Otherwise
winds decrease through the day out of the NE/E. Seas 2-4 feet,
approaching 5 ft for the far outer coastal waters.
Next chance for SCA conditions Sunday night and Monday,
potentially continuing into Tuesday. We are currently monitoring
potential for a coastal low pressure later next week (Thu-Fri).
There is uncertainty in the track of the low this far out and
thus the potential impacts. A closer track would raise the
threat for strong winds and rough seas. Stay tuned.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Rain showers.
Monday: Moderate risk for Small Craft Advisory winds with gusts
up to 30 kt. Areas of seas approaching 5 ft. Slight chance of
rain showers.
Monday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Local rough seas. Slight chance of rain
showers.
Tuesday: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Rough seas up to 10 ft. Slight chance of
rain showers.
Tuesday Night: Strong winds with gusts up to 40 kt. Rough seas
up to 11 ft. Slight chance of rain showers.
Wednesday: Strong winds with local gusts up to 45 kt. Rough
seas up to 13 ft. Slight chance of rain showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...High Risk for Rip Currents through this evening for MAZ007-015-016-
019-022-024.
RI...None.
MARINE...Small Craft Advisory until noon EDT today for ANZ231-232-250-
251-254>256.
&&
$$
DISCUSSION...Mensch
AVIATION...Hrencecin/Mensch
MARINE...Mensch
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: 6 High
Current (Estimated): 0 None
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
Friday:
1.98 in
September:
21.88 in
2026
Daily Extremes [‒] Daily Extremes [+]
12:00am
61.7°F
High today:
7:16am
51.1°F
Low today:
1:41pm
79.5°F
High Friday:
11:59pm
61.5°F
Low Friday:
12:04am
48.7°F
High dew pt today:
12:10am
67.6°F
High dew pt Friday:
12:18am
2 mph
Wind gust today:
12:02am
10 mph
Wind gust Friday:
Alerts / Advisories [‒] Alerts / Advisories [+]
No alerts/warnings active for Southeast Middlesex County.
Sun / Moon [‒] Sun / Moon [+]
First Light:
6:01am
Sunrise:
6:29am
Sunset:
6:48pm
Twilight ends:
7:16pm
Daylight length:
12 hours 19 minutes
Phase:
Waxing Gibbous (56%)
Moon rise:
3:16pm
Moon set:
11:49pm
Social Media - Mastodon [‒] Social Media - Mastodon [+]
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