PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

12:55 PM EDT SEP 18, 2026
Few Clouds
77°F
Feels Like: 79°F
Dewpoint: 55°F
Rel. Hum.: 47%
Visibility: 10 miles
Wind: WNW at 9 mph
Pressure: 30.01 inches
Last 72 hours

Local Area Snow Depth

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PORTSMOUTH, NH 03803
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TODAY
Patchy fog this morning. Mostly sunny. Highs in the upper 70s. Northwest winds around 10 mph.
TONIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s. Northwest winds around 10 mph in the evening, becoming light and variable.
SATURDAY
Mostly sunny. Highs in the mid 60s. Light and variable winds.
SATURDAY NIGHT
Partly cloudy. Lows in the upper 40s. Light and variable winds.
SUNDAY
Partly sunny in the morning, then mostly cloudy with a chance of rain in the afternoon. Highs in the mid 60s. Light and variable winds, becoming south around 10 mph in the afternoon. Chance of rain 50 percent.
SUNDAY NIGHT
Rain likely. Lows in the lower 50s. Chance of rain 60 percent.
MONDAY
Partly sunny. A chance of rain in the morning. Highs in the mid 60s. Chance of rain 30 percent.
MONDAY NIGHT
Partly cloudy. Lows in the upper 40s.
TUESDAY
Mostly cloudy in the morning, then becoming partly sunny. Highs around 60.
TUESDAY NIGHT
Partly cloudy. Lows in the upper 40s.
WEDNESDAY
Partly sunny. Highs in the lower 60s.
WEDNESDAY NIGHT
Partly cloudy. Lows in the upper 40s.
THURSDAY
Partly sunny. A chance of showers in the afternoon. Highs in the lower 60s. Chance of rain 30 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 AM EDT  9/18/2026
Friday
18 SEP 2026
PORTSMOUTH, NH 03803 weather forecast Day 1, 12 hours 2 PM 76° 78° Clear 0%

0% Thunder
( 0% severe)
NW   12 46% 54°
High 77° PORTSMOUTH, NH 03803 weather forecast Day 1, 15 hours 5 PM 73° 73° Clear NW   13 43% 49°
Increasing Clouds



PORTSMOUTH, NH 03803 weather forecast Day 1, 18 hours 8 PM 64° 64° Partly Cloudy 0%

0% Thunder
( 0% severe)
NW   9 50% 45°
PORTSMOUTH, NH 03803 weather forecast Day 1, 21 hours 11 PM 56° 55° Mostly Cloudy NNW   6 66% 45°
Saturday
19 SEP 2026
PORTSMOUTH, NH 03803 weather forecast Day 2, 0 hours 2 AM 51° 49° Mostly Cloudy 0%

0% Thunder
( 0% severe)
N   6 74% 43°
Low 47° PORTSMOUTH, NH 03803 weather forecast Day 2, 3 hours 5 AM 48° 45° Partly Cloudy N   6 77% 41°
High 66° PORTSMOUTH, NH 03803 weather forecast Day 2, 6 hours 8 AM 50° 48° Clear 0%

0% Thunder
( 0% severe)
NA   6 68% 40°

Clear



PORTSMOUTH, NH 03803 weather forecast Day 2, 9 hours 11 AM 61° 62° Clear NNE   3 42% 38°
PORTSMOUTH, NH 03803 weather forecast Day 2, 12 hours 2 PM 64° 64° Clear 0%

0% Thunder
( 0% severe)
ESE   6 40% 39°
PORTSMOUTH, NH 03803 weather forecast Day 2, 15 hours 5 PM 62° 61° Partly Cloudy SSE   9 44% 40°
PORTSMOUTH, NH 03803 weather forecast Day 2, 18 hours 8 PM 56° 55° Partly Cloudy 0%

0% Thunder
( 0% severe)
SSE   6 59% 42°
PORTSMOUTH, NH 03803 weather forecast Day 2, 21 hours 11 PM 52° 52° Partly Cloudy S   3 77% 45°
Sunday
20 SEP 2026
PORTSMOUTH, NH 03803 weather forecast Day 3, 0 hours 2 AM 50° 50° Mostly Cloudy 0%

0% Thunder
( 0% severe)
  CALM 83% 45°
Low 48° PORTSMOUTH, NH 03803 weather forecast Day 3, 3 hours 5 AM 48° 47° Mostly Cloudy   CALM 89% 45°
High 65° PORTSMOUTH, NH 03803 weather forecast Day 3, 6 hours 8 AM 52° 52° Mostly Cloudy 4%

0% Thunder
( 3% severe)
  CALM 80% 46°

Mostly Cloudy

Chance of Rain

PORTSMOUTH, NH 03803 weather forecast Day 3, 9 hours 11 AM 61° 60° Mostly Cloudy S   8 58% 46°
PORTSMOUTH, NH 03803 weather forecast Day 3, 15 hours 2 PM 62° 61° Mostly Cloudy 50%
RAIN
***
0% Thunder
( 8% severe)
SSE   10 56% 46°
PORTSMOUTH, NH 03803 weather forecast Day 3, 18 hours 5 PM 60° 59° Mostly Cloudy SSE   8 62% 47°
PORTSMOUTH, NH 03803 weather forecast Day 3, 21 hours 8 PM 58° 57° Mostly Cloudy     SE   6 75% 50°

PORTSMOUTH, NH extended weather forecast

Monday
21 SEP 2026
Tuesday
22 SEP 2026
Wednesday
23 SEP 2026
Thursday
24 SEP 2026
Friday
25 SEP 2026
Low 49° Low 47° Low 45° Low 46° Low 47°
High 66° High 58° High 59° High 61° High 67°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Mostly Cloudy
67% Rain
Mostly Cloudy
25% Rain
Overcast
32% Rain
Overcast
48% Rain
Overcast
40% Rain
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