PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

6:55 AM EDT AUG 12, 2026
Few Clouds
66°F
Feels Like: 66°F
Dewpoint: 63°F
Rel. Hum.: 90%
Visibility: 10 miles
Wind: SW at 3 mph
Pressure: 29.77 inches
Last 72 hours

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PORTSMOUTH, NH 03803
Weather Forecast

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Snow Depth pages
TODAY
Mostly sunny. Highs in the lower 80s. Light and variable winds.
TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s. Light and variable winds.
THURSDAY
Partly sunny. A chance of showers with a slight chance of thunderstorms in the afternoon. Humid with highs in the lower 80s. Light and variable winds. Chance of rain 40 percent.
THURSDAY NIGHT
Partly cloudy in the evening, then clearing. Lows in the lower 60s. Light and variable winds.
FRIDAY
Mostly sunny. Highs in the lower 80s. Light and variable winds, becoming northwest around 10 mph in the afternoon.
FRIDAY NIGHT
Mostly clear. Lows in the upper 50s.
SATURDAY
Mostly sunny. Highs in the lower 80s.
SATURDAY NIGHT
Mostly clear. Lows in the upper 50s.
SUNDAY
Partly sunny. A chance of showers in the afternoon. Highs around 80. Chance of rain 30 percent.
SUNDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. A 50 percent chance of showers. Lows in the lower 60s.
MONDAY
Partly sunny with a chance of showers. Highs in the upper 70s. Chance of rain 50 percent.
MONDAY NIGHT
Partly cloudy. Lows in the lower 60s.
TUESDAY
Mostly sunny. Highs in the lower 80s.

Visible Weather Satellite
PORTSMOUTH, NH 03803
Infrared Weather Satellite
PORTSMOUTH, NH 03803
NEXRAD Weather Radar
PORTSMOUTH, NH 03803

PORTSMOUTH, NH 3 hourly weather forecast

weather forecast created  8:00 PM EDT  8/11/2026
Wednesday
12 AUG 2026
PORTSMOUTH, NH 03803 weather forecast Day 1, 0 hours 2 AM 66° 66° Partly Cloudy 1%

0% Thunder
( 0% severe)
W   3 75% 58°
Low 63° PORTSMOUTH, NH 03803 weather forecast Day 1, 3 hours 5 AM 64° 65° Partly Cloudy WNW   3 81% 58°
High 85° PORTSMOUTH, NH 03803 weather forecast Day 1, 6 hours 8 AM 69° 69° Clear 1%

0% Thunder
( 0% severe)
WNW   5 73% 60°

Partly Cloudy



PORTSMOUTH, NH 03803 weather forecast Day 1, 9 hours 11 AM 81° 81° Clear WNW   5 46% 58°
PORTSMOUTH, NH 03803 weather forecast Day 1, 12 hours 2 PM 83° 82° Partly Cloudy 7%

0% Thunder
( 12% severe)
W   6 40% 56°
PORTSMOUTH, NH 03803 weather forecast Day 1, 15 hours 5 PM 81° 81° Partly Cloudy S   8 44% 57°
PORTSMOUTH, NH 03803 weather forecast Day 1, 18 hours 8 PM 73° 73° Partly Cloudy 9%

0% Thunder
( 14% severe)
SSW   5 62% 59°
PORTSMOUTH, NH 03803 weather forecast Day 1, 21 hours 11 PM 68° 68° Partly Cloudy SW   3 76% 60°
Thursday
13 AUG 2026
PORTSMOUTH, NH 03803 weather forecast Day 2, 0 hours 2 AM 66° 66° Partly Cloudy 9%

0% Thunder
( 10% severe)
WNW   2 81% 60°
Low 63° PORTSMOUTH, NH 03803 weather forecast Day 2, 3 hours 5 AM 64° 65° Mostly Cloudy W   3 87% 60°
High 84° PORTSMOUTH, NH 03803 weather forecast Day 2, 6 hours 8 AM 68° 68° Mostly Cloudy 33%
RAIN
***
0% Thunder
( 6% severe)
WNW   3 81% 62°

Partly Cloudy

Chance of Rain

PORTSMOUTH, NH 03803 weather forecast Day 2, 9 hours 11 AM 79° 80° Partly Cloudy WSW   6 56% 62°
PORTSMOUTH, NH 03803 weather forecast Day 2, 12 hours 2 PM 82° 82° Partly Cloudy 13%
RAIN
<.01 in
0% Thunder
( 14% severe)
SSW   7 47% 60°
PORTSMOUTH, NH 03803 weather forecast Day 2, 15 hours 5 PM 80° 81° Partly Cloudy W   7 52% 61°
PORTSMOUTH, NH 03803 weather forecast Day 2, 18 hours 8 PM 73° 73° Mostly Cloudy 4%

0% Thunder
( 5% severe)
W   5 68% 62°
PORTSMOUTH, NH 03803 weather forecast Day 2, 21 hours 11 PM 68° 68° Clear WNW   6 78% 61°

PORTSMOUTH, NH extended weather forecast

Friday
14 AUG 2026
Saturday
15 AUG 2026
Sunday
16 AUG 2026
Monday
17 AUG 2026
Tuesday
18 AUG 2026
Low 61° Low 58° Low 59° Low 63° Low 59°
High 80° High 78° High 79° High 81° High 79°
PORTSMOUTH, NH 03803 weather forecast Day 3 PORTSMOUTH, NH 03803 weather forecast Day 4 PORTSMOUTH, NH 03803 weather forecast Day 5 PORTSMOUTH, NH 03803 weather forecast Day 6 PORTSMOUTH, NH 03803 weather forecast Day 7
Partly Cloudy
4% Rain
Clear
3% Rain
Mostly Cloudy
60% Rain
Mostly Cloudy
51% Rain
Partly Cloudy
16% Rain
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