Lexington, Massachusetts, USA
35.1°F
1.7°C
Cold
Clear
This Afternoon: Hi 64 °F
Tonight: Lo 46 °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 Thursday: 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 Fri May 22, 2026 2:50pm EDT
- Steady light rains develop Saturday evening in western New England, leading to a soggy and cool Sunday with much needed rainfall. Cool daytime highs Sunday in the 40s to mid 50s but warming Sunday night into the upper 50s.
- A damp morning on Memorial Day but improving for the afternoon, followed by summer like warmth for the middle of next week before trending more seasonable with a few showers to end the week.
Partly Sunny
Hi 64 °F
Partly sunny, with a high near 64. Southeast wind around 8 mph.
Mostly Cloudy
Lo 46 °F
Mostly cloudy, with a low around 46. Southwest wind 1 to 6 mph.
Mostly Cloudy
Hi 64 °F
Mostly cloudy, with a high near 64. Northeast wind 1 to 9 mph.
Cloudy
Lo 47 °F
Cloudy, with a low around 47. East wind around 7 mph.
Light Rain
Hi 52 °F
Rain. Cloudy, with a high near 52. East wind 6 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.
Showers And T-Storms
Lo 52 °F
Rain before 9pm, then showers and thunderstorms. Cloudy, with a low around 52. Northeast wind 5 to 10 mph. Chance of precipitation is 100%.
Chance Rain Showers
Hi 71 °F
A chance of rain showers. Mostly cloudy, with a high near 71. Northwest wind around 6 mph. Chance of precipitation is 50%.
Slight Chance Rain Showers then Mostly Cloudy
Lo 54 °F
A slight chance of rain showers before 7pm. Mostly cloudy, with a low around 54. Southwest wind around 5 mph.
Partly Sunny
Hi 81 °F
Partly sunny, with a high near 81. West wind 2 to 7 mph.
Partly Cloudy
Lo 58 °F
Partly cloudy, with a low around 58. Southwest wind around 6 mph.
Mostly Sunny then Chance Rain Showers
Hi 82 °F
A chance of rain showers after 1pm. Mostly sunny, with a high near 82. West wind 5 to 10 mph. Chance of precipitation is 30%.
Slight Chance Rain Showers then Partly Cloudy
Lo 55 °F
A slight chance of rain showers before 8pm. Partly cloudy, with a low around 55. Northwest wind around 8 mph.
Mostly Sunny
Hi 71 °F
Mostly sunny, with a high near 71. North wind 6 to 9 mph.
Partly Cloudy
Lo 51 °F
Partly cloudy, with a low around 51. North wind 3 to 7 mph.
Issued by:
National Weather Service Boston / Norton, MA
Updated Fri May 22, 2026 2:50pm EDT

E 8 mph
E 8 mph
SE 7 mph
SE 6 mph
SE 5 mph
SE 5 mph
SE 3 mph
S 3 mph
S 3 mph
SW 2 mph
W 2 mph
W 1 mph
NW 1 mph
NW 1 mph
W 1 mph
NW 1 mph
N 1 mph
NE 2 mph
NE 5 mph
E 6 mph
E 7 mph
E 8 mph
E 8 mph
E 9 mph
E 8 mph
E 8 mph
E 8 mph
E 7 mph
E 7 mph
E 7 mph
E 6 mph
E 6 mph
SE 6 mph
SE 5 mph
SE 5 mph
SE 5 mph
000
FXUS61 KBOX 221848
AFDBOX
Area Forecast Discussion
National Weather Service Boston/Norton MA
248 PM EDT Fri May 22 2026
.WHAT HAS CHANGED...
Issued small craft advisories for the southern waters for
Saturday night and Sunday with southeast winds. Rain totals for
this weekend were increased as well.
&&
.KEY MESSAGES...
- Steady light rains develop Saturday evening in western New
England, leading to a soggy and cool Sunday with much needed
rainfall. Cool daytime highs Sunday in the 40s to mid 50s but
warming Sunday night into the upper 50s.
- A damp morning on Memorial Day but improving for the
afternoon, followed by summer like warmth for the middle of
next week before trending more seasonable with a few showers
to end the week.
&&
.DISCUSSION...
KEY MESSAGE 1...Steady light rains develop Saturday evening in
western New England, leading to a soggy and cool Sunday with
much needed rainfall. Cool daytime highs Sunday in the 40s to
mid 50s but warming Sunday night into the upper 50s.
Most of the daytime hours Saturday are overcast with easterly
onshore breezes, but with generally dry weather and highs mid
50s east coast to the low to mid 60s interior. However we're
looking a damp and soggy Saturday evening and especially
Sunday/Sunday night, as a slow-moving warm front associated with
a anomalous burst of moisture moves NE through Southern New
England.
Initial burst of warm-frontal rain breaks out in western
sections of New England (Berkshires/CT Valley into Tolland
Hills) by Saturday night, but will struggle to advance east into
central/eastern MA and RI as antecedent sfc ridging maintains
itself. Most of the non-NAM- based guidance brings this rain
into eastern MA and RI by Sunday morning, while the NAM is
considerably slower and waits to bring it in Sunday afternoon.
NAM seems too dry so sided towards the non-NAM- based guidance,
which brings rain into eastern portions of Southern New England
by Sunday morning.
Buoyed by SE 925mb low level jet on the order of 40 kts, increasing
moisture advection Sunday allows for PWAT values to rise to around
1.3 to 1.6", in the 1.5 to 2 standard deviation range above late-May
climatology. Despite the favorable moisture/theta-e advection, am
skeptical about thunder prospects with poor lapse rates. I think
it's highly unlikely we'll be able to muster any surface-based
instability; but if we do, it's worth noting that low-level
hodographs are pretty curved in the warm advection and SE low-level
jet Sunday morning, particularly over the southern waters. It's way
too conditional to include in the forecast for now. Regardless, it
still looks like Sunday into Sunday night are a washout in most of
Southern New England with steady light to moderate rain, with some
downpours possible especially in southeast MA/RI where moisture
convergence appears maximized. Really, a beneficial and much-needed
widespread rain looks on tap, with storm total rainfall from
Saturday early evening through early Monday morning running upwards
of an inch in northern MA north of the Mass Pike, to 1.5-2 inches
south of the Mass Pike with the highest totals along the South
Coast, Cape and Islands. It also creates a scenario where the Sunday
maximum temperature occurs just prior to midnight Monday, with cool
Sunday daytime highs (upper 40s terrain to the low-mid 50s
elsewhere) then warming up through the night Sunday night (mid 50s
to near 60).
KEY MESSAGE 2...A damp morning on Memorial Day but improving
for the afternoon, followed by summer like warmth for the middle
of next week before trending more seasonable with a few showers
to end the week.
Latest model guidance not offering any significant changes in the
expected weather pattern next week, and the overall NBM guidance
looks pretty good. I'm optimistic that although Memorial Day Monday
will start damp, that by later in the day much of southern New
England will see better weather for the afternoon. The exception
would be the far eastern areas where clouds and light rain could
persist until late day. After that, models are in strong agreement
for a warmer and dry patter moving in for Tuesday and Wednesday.
925mb temperatures both days look to be in the 16-18C range, which
would support high temperatures solidly in the mid 80s.
Probabilities for reaching 90F are low, but does have a signal.
Currently it's about a 5% chance on Tuesday across the CT River
Valley. Wednesday is a higher chance, reaching 30% for
Springfield/Hartford area and some 10-15% chances across eastern CT
and northeast into the Boston area. That said, the latest GFS
deterministic run is a little warmer Tuesday and then a bit cooler
on Wednesday, so if that is the start of a model trend, then the
current probabilities may flip flop. Either way, it's high
confidence for warm weather. Humidity levels won't be too high, so
it's not looking like Heat headlines will be needed. As we go later
in the week, guidance is suggesting an upper low developing well to
our north. Primary "impacts" would be temperatures slightly cooling
closer to normal and perhaps a spot shower/t-storm in the
afternoons, but generally dry for most of the region.
&&
.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update:
This Afternoon through Saturday: High confidence.
VFR; mainly BKN/OVC high clouds thru Sat morning, then lowering
to a midlevel cloud deck rest of Sat. Winds through this
afternoon are easterly around 8-12 kt (gusts 20 kt SE New
England), with seabreezes turning light/variable by 03z. Winds
Sat return to ENE to ESE around 10 kt.
Saturday Night: High confidence in trends but moderate on
timing.
Ceilings continue to lower in the VFR range, but rain and MVFR
ceilings/visbys develop towards BDL by early Saturday evening,
spreading east into ORH during the overnight. E to SE winds
increasing to around 10-15 kt.
KBOS...High confidence in TAF.
KBDL...High confidence in TAF.
Outlook /Saturday Night through Wednesday/...
Sunday: Mainly MVFR, with areas IFR possible. Windy with local
gusts up to 30 kt. RA.
Sunday Night: MVFR/IFR conditions possible. Breezy. Chance
SHRA, isolated TSRA.
Memorial Day: Mainly VFR, with local IFR possible. Chance SHRA.
Monday Night: VFR. Slight chance SHRA.
Tuesday: Mainly VFR, with local IFR possible.
Tuesday Night: VFR.
Wednesday: 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.
Sub-SCA conditons continue through Saturday afternoon, with easterly
winds around 10-15 kt and seas 4 ft or less.
A frontal system will bring enhanced southeast winds, building seas,
and steady rain for the waters Saturday early evening through
Sunday. Over the southern waters, SE winds increase to 25-30 kt by
Saturday night right through Sunday and seas building to 6 to 10 ft
over the through Sunday. For the eastern waters, winds become SE and
increase to 15-20 kt by Sunday morning and into the 20-25 kt range
thru Sunday, with around 4 to 6 ft seas over the eastern waters.
Given the holiday weekend and with stronger confidence, SCAs
have been hoisted for the southern waters. SCAs will need to be
considered for the eastern waters for Sunday. Rain, some heavy
at times Sunday, could reduce visibility as well.
Outlook /Saturday Night through Wednesday/...
Sunday: Moderate risk for Small Craft Advisory winds with gusts
up to 30 kt. Areas of rough seas. Rain, isolated thunderstorms.
Local visibility 1 to 3 nm.
Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of rough seas. Rain showers, slight
chance of thunderstorms.
Memorial Day: Winds less than 25 kt. Seas up to 5 ft. Chance of
rain showers.
Monday Night: Winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.
Tuesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Tuesday Night: Winds less than 25 kt.
Wednesday: Winds less than 25 kt. Slight chance of rain
showers.
&&
.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory from 5 AM Sunday to 2 AM EDT Monday for
ANZ231.
Small Craft Advisory from 2 AM Sunday to 5 AM EDT Monday for
ANZ232>235-237.
Small Craft Advisory from 8 PM Saturday to 5 AM EDT Monday for
ANZ254>256.
&&
$$
DISCUSSION...Loconto/Nash
AVIATION...Loconto/Nash
MARINE...Loconto/Nash
Radar images courtesy Weather Underground / Intellicast.
UV Index forecast high for today: 8 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
Thursday:
0.01 in
May:
1.26 in
2026
1:17pm
36.1°F
High today:
12:00am
25.2°F
Low today:
2:28pm
30.4°F
High Thursday:
7:11am
16.2°F
Low Thursday:
12:00am
25.2°F
Low wind chill today:
7:11am
16.2°F
Low wind chill Thursday:
1:17pm
33.3°F
High dew pt today:
11:56pm
20.7°F
High dew pt Thursday:
None
Wind gust today:
None
Wind gust Thursday:
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