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Shaded-relief atlas plate of Groton, Massachusetts: rivers, roads, the city limits and where the water drains.
MASSACHUSETTS · MIDDLESEX COUNTY

Groton

1,353 people, 310 ft above sea level in Middlesex County.

310 ftElevation, city center
1,353People, 2024 estimate
2 sq miLand area
Sunny 65°
Sunny now Dew point 57° · WNW 7 mph · high 65°
City of Groton River Interstate 2 miles
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The Groton plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Groton

NWS forecast and National Blend of Models · updated 2:00 PM EDT
RIGHT NOW Logan International Airport (KBOS) · 2:54 PM
Sunny
65° Sunny Feels like 65° · high of 65° near 3 PM
WindWNW 7 mphno gusts
Humidity76%rising to 93% by morning
Pressure29.94 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 57° · Comfortableabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Rain
Friday40% chance · showers
LIKELY AMOUNT—amounts come within 3 days
LAST RAINSept. 271.5 in · 2 dry days
ALERTS & OUTLOOKS
No watches or warnings for Middlesex County
NWS Norton and the Storm Prediction Center · checked 3:47 PM
SUN & MOON
↑ 6:40 AM6:32 PM ↓
11 h 51 m of daylight, 3 minutes less than yesterday
Waning gibbous, 89% lit. The Harvest Moon was full Saturday.
AIR & POLLEN
15
GOODAir quality index · ozone
Tomorrow: None, good. No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
TUESDAY, SEPT. 29
WEDNESDAY, SEPT. 30
THURSDAY, OCT. 1
FRIDAY, OCT. 2
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
3p
6p
9p
Mid
3a
6a
9a
Noon
mostly cloudy day
partly cloudy night
mostly cloudy night
mostly cloudy night
partly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
partly cloudy day
partly cloudy night
partly cloudy night
partly cloudy night
mostly cloudy night
partly cloudy day
partly cloudy day
mostly sunny
mostly sunny
partly cloudy night
partly cloudy night
mostly clear night
partly cloudy night
partly cloudy day
partly cloudy day
partly cloudy day
TEMPERATURE °F
65°
57°
66°
60°
74°
66°
CHANCE OF RAIN
50%
WIND, MPH
6
3
1
2
3
3
0
5
7
8
8
8
8
8
10
12
13
13
13
12
11
10
11
13
HOW IT FEELS · DEW POINT
Comfortable: dew points 55 to 61°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 68° / 53°
TUE Sept. 29 Mostly cloudy Mostly cloudy
65° 57°
0% rain — NW 5 A
WED Sept. 30 Partly cloudy Partly cloudy
69° 59°
0% rain — ESE 4 B
THU Oct. 1 Partly cloudy; warmer Partly cloudy; warmer
77° 66°
0% rain — SW 11 B
FRI Oct. 2 Chance of showers Chance of showers
80° 61°
40% rain up to 0.1″ WSW 14 C
SAT Oct. 3 Mostly sunny; cooler Mostly sunny; cooler
66° 52°
10% rain — E 6 B
SUN Oct. 4 Chance of showers Chance of showers
62° 52°
40% rain up to 0.8″ SE 10 C
MON Oct. 5 Mostly sunny Mostly sunny
63° 47°
10% rain — NW 14 C
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Groton about 5,000 feet above the ground was over the western Atlantic three days ago, about 2,020 miles back along its path. The nine paths traced from around the city fan out, so treat that as a best guess. Near the ground the air came from Quebec; at 10,000 feet, from the western Atlantic. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE7
ON THE NETWORK

Around Groton on the Forecast Network

Neighboring plates

Worcester MA · 27 MI 27 miles southwest Boston MA · 34 MI 34 miles southeast Providence RI · 55 MI 55 miles south Springfield MA · 60 MI 60 miles southwest Bridgeport CT · 129 MI 129 miles southwest Brookhaven NY · 141 MI 141 miles southwest
FORECASTCITY
Atlas plate of Groton, Massachusetts. Explore the plate
MASSACHUSETTS · MIDDLESEX

Groton

1,353 people, 310 ft above sea level in Middlesex County.

310 ftElevation
1,353People
2 sq miLand
Sunny 65°
SunnyDew point 57°
1

Today in Groton

NEXT 15 HOURS
Now partly cloudy day 65° 1%
6p partly cloudy day 64° 3%
9p mostly cloudy night 62° 3%
12a mostly cloudy night 61° 2%
3a partly cloudy night 59° 1%
6a partly cloudy night 57° 1%
Rain
NEXT RAINFriday · 40%
→
Tue0%
Mostly cloudy Mostly cloudy
57
65
A
Wed0%
Partly cloudy Partly cloudy
59
69
B
Thu0%
Partly cloudy; warmer Partly cloudy; warmer
66
77
B
Fri40%
Chance of showers Chance of showers
61
80
C
Sat10%
Mostly sunny; cooler Mostly sunny; cooler
52
66
B
Sun40%
Chance of showers Chance of showers
52
62
C
Mon10%
Mostly sunny Mostly sunny
47
63
C
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
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