Lexington, Massachusetts, USA
35.1°F
1.7°C
Cold
Light rain, Overcast
Tonight: Lo 34 °F
Monday: Hi 51 °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 Apr 19, 2026 1:41pm EDT
Rain Showers Likely then Partly Cloudy
Lo 34 °F
Rain showers likely and patchy fog before 8pm. Partly cloudy, with a low around 34. West wind 6 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
Mostly Sunny then Chance Rain Showers
Hi 51 °F
A chance of rain showers after 2pm. Mostly sunny, with a high near 51. West wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
Slight Chance Rain Showers then Mostly Cloudy
Lo 32 °F
A slight chance of rain showers before 8pm. Mostly cloudy, with a low around 32. Northwest wind around 7 mph. Chance of precipitation is 20%.
Mostly Sunny
Hi 50 °F
Mostly sunny, with a high near 50. Northeast wind around 6 mph.
Partly Cloudy then Chance Rain Showers
Lo 37 °F
A chance of rain showers after 2am. Partly cloudy, with a low around 37. South wind around 7 mph. Chance of precipitation is 30%.
Slight Chance Rain Showers then Mostly Cloudy
Hi 52 °F
A slight chance of rain showers before 8am. Mostly cloudy, with a high near 52. South wind around 8 mph. Chance of precipitation is 20%.
Mostly Cloudy
Lo 39 °F
Mostly cloudy, with a low around 39. Southwest wind around 7 mph.
Partly Sunny
Hi 61 °F
Partly sunny, with a high near 61. Northwest wind 5 to 8 mph.
Partly Cloudy
Lo 41 °F
Partly cloudy, with a low around 41. Northwest wind around 7 mph.
Mostly Sunny
Hi 59 °F
Mostly sunny, with a high near 59. North wind around 7 mph.
Slight Chance Rain Showers
Lo 41 °F
A slight chance of rain showers after 9pm. Partly cloudy, with a low around 41. Northeast wind 3 to 7 mph.
Chance Rain Showers
Hi 57 °F
A chance of rain showers. Partly sunny, with a high near 57. Northeast wind 5 to 8 mph. Chance of precipitation is 30%.
Chance Rain Showers
Lo 42 °F
A chance of rain showers. Mostly cloudy, with a low around 42. South wind 3 to 7 mph. Chance of precipitation is 40%.
Chance Rain Showers
Hi 59 °F
A chance of rain showers. Partly sunny, with a high near 59. Northeast wind 3 to 8 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Sun Apr 19, 2026 1:41pm EDT

NW 13 mph
NW 10 mph
W 10 mph
W 9 mph
W 7 mph
W 7 mph
W 7 mph
W 6 mph
W 7 mph
W 6 mph
W 6 mph
W 6 mph
W 6 mph
W 6 mph
W 6 mph
W 6 mph
W 6 mph
W 7 mph
W 7 mph
W 7 mph
W 7 mph
NW 7 mph
NW 7 mph
NW 6 mph
NW 6 mph
N 6 mph
N 6 mph
N 6 mph
N 6 mph
N 7 mph
N 7 mph
N 6 mph
N 6 mph
N 6 mph
N 6 mph
N 6 mph
000
FXUS61 KBOX 192334
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
734 PM EDT Sun Apr 19 2026
.WHAT HAS CHANGED...
Minor adjustments made to the aviation forecast, with respect
to flight categories, otherwise the core forecast is on track.
&&
.KEY MESSAGES...
- Isolated T-Showers and rain through this afternoon and then
clearing tonight. Becoming chilly for Monday morning.
- Cool with shower chances on Patriot's Day. Overnight turning
cold with subfreezing conditions across much of SNE.
- Cooler again for Tuesday before a return of seasonable
temperatures Wednesday and the rest of the week
&&
.DISCUSSION...
KEY MESSAGE 1...Isolated T-Showers and rain through this
afternoon and then clearing tonight. Becoming chilly for Monday
morning.
Ahead of an approaching cold front convective showers
developing in eastern MA and RI. While not severe, these showers
have a history of lightning and pea sized hail. Luckily, those
weak thunder showers are short-lived with a more stratiform
light rain associated with the cold front. The system is fairly
progressive, anticipating the rain will end from west to east
between 5pm and 8pm. As mentioned, cannot rule out a few wet
snowflakes mixing in the highest elevation of northern and
western MA. Otherwise, a brief period of gusty wind from the
W-WNW 20 to 30 mph with the frontal passage. Tonight, clear
skies and decreasing winds less than 10 mph. Chilly, lows fall
into the lower to mid-30s, with northern Worcester County and
the eastern slopes of the Berkshires in the upper 20s.
KEY MESSAGE 2...Cool with shower chances on Patriot's Day.
Overnight turning cold with subfreezing conditions across much
of SNE.
Patriot's Day is a chilly one, there is no doubt about that.
Falling 500mb heights from a mid-level trough brings much colder
air into southern New England. 925mb temperatures Monday
afternoon are around 0C to -2C, thus afternoon temperatures
range between the low-50s and the upper-40s. Looking back at the
high temperature since 2020, the forecast high for tomorrow
lines up, of the six years, four of those years have had
temperatures in the low to mid-50s. For those curious minded
people, the highest temperatures on Patriot's Day occurred in
2012 with a high of 87F and coldest high of 38F in 1925 and
1926.
Sensible weather, scattered showers from a weak low pressure
passing south of New England's waters. However, would like to
reiterate not every town will experience showers due to the
scattered nature. Wind is from the W early in the morning, then
NW early afternoon at 10-15 mph. There is some uncertainty, but
wind could shift to the N by the evening which could drain
colder air down from northern New England and any lingering rain
showers could become a light snow shower. Have lower confidence
in this happening, though it is an outlying, albeit lower
chance.
Turning even colder Monday night into Tuesday with morning lows
in the low-30s to upper-20s across the entire region. While
early last week felt more like summer, it's not uncommon for
subfreezing conditions during mid to late April. In fact, per
climo, the average last freeze is at/or around May 1st for most
of southern New England. This is why Frost or Freeze headlines
have not been issued from our office, at this time. That said,
if you have already place sensitive plants outside. It would be
wise to cover or bring inside.
KEY MESSAGE 3...Cooler Tuesday before a return of seasonable
temperatures Wednesday and the rest of the week.
Sharply colder Tuesday morning after a night of effective
radiational cooling Monday night. Expecting lows in the lower to
mid 20s across the interior and closer to freezing along the
coast. A cool but otherwise pleasant day Tuesday. 925mb temps
struggle to warm above -5C, so highs will struggle to warm much
above 50 degrees for most locations. Some showers are possible
Wednesday morning as a weak boundary moves through the region.
Expecting mainly rain showers, but a few wet snowflakes are
possible across the interior. More seasonal temperatures make a
return Wednesday afternoon as the core of the upper trough moves
offshore. 925 mb temperatures recover to around 5C, supporting
more seasonable highs in the upper 50s/low 60s. NW flow makes a
return towards Thursday/Friday in the wake of another front
passing through sometime late Wednesday, and high pressure
builds back in as ridging approaches, which should keep the
region dry. Still seeing some disagreement with the west/east
positioning of a cutoff upper level trough over the Canadian
Maritimes Thursday and Friday. The placement of this feature
will strongly influence weather later this week. A closer
position brings much cooler and unsettled weather with a chance
for showers Thurs/Friday. Believe the NBM has a fairly good
handle and splits the difference with mostly cloudy skies and
highs in the lower to mid 60s. Next chance for rain arrives
Saturday with an approaching frontal system.
&&
.AVIATION /00Z MONDAY THROUGH FRIDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
00z TAF Update:
Through 06z: High Confidence.
VFR. Diminishing wind gusts. W wind 5-10 kts.
Monday...Moderate confidence.
Low-end VFR ceilings (040 to 060) along with sct'd showers. Cannot
rule out wet snow flakes mixing in after sunset. WNW to NW wind at
10-15 kts.
Monday Night...High confidence.
VFR. Skies becoming clear, NW wind becomes NNW to N 5-10 kts.
KBOS Terminal... Moderate Confidence in TAF.
Sct'd convective showers could produce an isolated lightning
strike near KBOS over the next 90 minutes, ending around 1830z.
Gusty W-WNW winds increase as well, gusting 25-30 knots through
00-02z. There after becoming VFR with a W wind around 8-10 kts.
KBDL Terminal... High Confidence in TAF.
Outlook /Monday Night through Friday/...
Tuesday: VFR.
Tuesday Night: Mainly VFR, with local MVFR possible. Slight
chance SHRA.
Wednesday: Mainly VFR, with local IFR possible.
Wednesday Night through Friday: VFR.
&&
.MARINE...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Monday Night: High Confidence.
Strong cold front brings SCA conditions and rain, seas 3-5
feet, and W-NW gust up to 30 knots for all of the waters this
evening and ending by early Monday morning. Winds shift NW and
ease following this frontal passage late tonight. Winds shift W
over the southern waters and more S over the E/NE waters Monday,
falling between 10-15 kts, eventually winds shift to the NNW/N
by Monday night. Lastly, seas settle to 2-3 ft.
Outlook /Monday Night through Friday/...
Tuesday: Winds less than 25 kt.
Tuesday Night: Winds less than 25 kt. Slight chance of rain
showers.
Wednesday: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers.
Wednesday Night through Friday: Winds less than 25 kt.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for
ANZ230>237-250-251.
Small Craft Advisory until 11 PM EDT this evening for
ANZ254>256.
&&
$$
DISCUSSION...Dooley/FT
AVIATION...Dooley/FT
MARINE...Dooley/FT
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 4 Medium
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
April:
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 Crescent (82%)
Moon set:
8:18am
Moon rise:
9:38pm