PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

1:55 AM EDT SEP 15, 2026
Clear
50°F
Feels Like: 50°F
Dewpoint: 45°F
Rel. Hum.: 83%
Visibility: 10 miles
Wind: Calm
Pressure: 30.25 inches
Last 72 hours

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PORTSMOUTH, NH 03803
Weather Forecast

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Snow Depth pages
REST OF TONIGHT
Clear. Lows in the upper 40s. Light and variable winds.
TUESDAY
Mostly sunny. Highs in the upper 60s. Light and variable winds.
TUESDAY NIGHT
Partly cloudy in the evening, then becoming mostly clear. Lows around 50. Light and variable winds.
WEDNESDAY
Partly sunny. Highs in the upper 70s. Light and variable winds.
WEDNESDAY NIGHT
Partly cloudy. Lows in the upper 50s. Light and variable winds.
THURSDAY
Partly sunny. Highs in the lower 70s.
THURSDAY NIGHT
Becoming mostly cloudy after midnight. Showers likely, mainly in the evening. Lows in the lower 60s. Chance of rain 60 percent.
FRIDAY
Partly sunny. Highs in the mid 70s.
FRIDAY NIGHT
Mostly clear. Lows around 50.
SATURDAY
Partly sunny. Highs in the mid 60s.
SATURDAY NIGHT
Partly cloudy in the evening, then mostly cloudy with a chance of showers after midnight. Lows in the lower 50s. Chance of rain 40 percent.
SUNDAY
Showers likely. Highs around 70. Chance of rain 60 percent.
SUNDAY NIGHT
Showers likely, mainly in the evening. Lows in the mid 50s. Chance of rain 60 percent.

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  9/14/2026
Tuesday
15 SEP 2026
PORTSMOUTH, NH 03803 weather forecast Day 1, 0 hours 2 AM 50° 49° Clear 0%

0% Thunder
( 0% severe)
NNW   3 83% 45°
Low 47° PORTSMOUTH, NH 03803 weather forecast Day 1, 3 hours 5 AM 48° 46° Clear N   5 89% 45°
High 68° PORTSMOUTH, NH 03803 weather forecast Day 1, 6 hours 8 AM 52° 52° Clear 0%

0% Thunder
( 0% severe)
N   3 77% 45°

Partly Cloudy



PORTSMOUTH, NH 03803 weather forecast Day 1, 9 hours 11 AM 63° 63° Clear E   6 50% 44°
PORTSMOUTH, NH 03803 weather forecast Day 1, 12 hours 2 PM 66° 66° Partly Cloudy 0%

0% Thunder
( 0% severe)
ESE   7 47% 45°
PORTSMOUTH, NH 03803 weather forecast Day 1, 15 hours 5 PM 64° 64° Partly Cloudy SE   8 50% 45°
PORTSMOUTH, NH 03803 weather forecast Day 1, 18 hours 8 PM 58° 57° Partly Cloudy 2%

0% Thunder
( 0% severe)
SSE   6 60% 44°
PORTSMOUTH, NH 03803 weather forecast Day 1, 21 hours 11 PM 54° 53° Partly Cloudy S   5 86% 50°
Wednesday
16 SEP 2026
PORTSMOUTH, NH 03803 weather forecast Day 2, 0 hours 2 AM 51° 50° Partly Cloudy 3%

0% Thunder
( 0% severe)
SW   3 96% 50°
Low 49° PORTSMOUTH, NH 03803 weather forecast Day 2, 3 hours 5 AM 50° 48° Partly Cloudy SW   5 100% 50°
High 78° PORTSMOUTH, NH 03803 weather forecast Day 2, 6 hours 8 AM 53° 51° Partly Cloudy 0%

0% Thunder
( 2% severe)
SW   7 90% 50°

Mostly Cloudy



PORTSMOUTH, NH 03803 weather forecast Day 2, 9 hours 11 AM 68° 68° Mostly Cloudy SSW   7 59% 53°
PORTSMOUTH, NH 03803 weather forecast Day 2, 12 hours 2 PM 75° 75° Mostly Cloudy 0%

0% Thunder
( 2% severe)
SSW   7 50% 55°
PORTSMOUTH, NH 03803 weather forecast Day 2, 15 hours 5 PM 75° 75° Mostly Cloudy S   8 54% 57°
PORTSMOUTH, NH 03803 weather forecast Day 2, 18 hours 8 PM 67° 67° Partly Cloudy 0%

0% Thunder
( 2% severe)
S   5 73% 58°
PORTSMOUTH, NH 03803 weather forecast Day 2, 21 hours 11 PM 63° 64° Partly Cloudy   CALM 90% 60°

PORTSMOUTH, NH extended weather forecast

Thursday
17 SEP 2026
Friday
18 SEP 2026
Saturday
19 SEP 2026
Sunday
20 SEP 2026
Monday
21 SEP 2026
Low 60° Low 57° Low 49° Low 52° Low 51°
High 68° High 75° High 66° High 65° High 67°
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
Overcast
66% Rain
Mostly Cloudy
46% Rain
Partly Cloudy
8% Rain
Overcast
56% Rain
Overcast
31% Rain
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