PORTSMOUTH, NH 03801 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

7:55 AM EDT MAY 18, 2026
Broken Clouds
63°F
Feels Like: 63°F
Dewpoint: 45°F
Rel. Hum.: 52%
Visibility: 10 miles
Wind: ESE at 7 mph
Pressure: 30.23 inches
Last 72 hours

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PORTSMOUTH, NH 03801
Weather Forecast

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TODAY
Partly sunny. Highs in the upper 60s. Light and variable winds, becoming southeast around 10 mph this afternoon.
TONIGHT
Mostly clear. Lows in the mid 50s. Light and variable winds.
TUESDAY
Partly sunny. A slight chance of showers in the afternoon. Warmer with highs around 90. Southwest winds around 10 mph with gusts up to 25 mph. Chance of rain 20 percent.
TUESDAY NIGHT
Mostly clear. Lows in the upper 60s. Southwest winds around 10 mph.
WEDNESDAY
Partly sunny. A chance of showers in the afternoon. Warm with highs in the mid 80s. West winds around 10 mph with gusts up to 25 mph. Chance of rain 50 percent.
WEDNESDAY NIGHT
Partly cloudy. A chance of showers in the evening. Lows in the lower 50s. Chance of rain 50 percent.
THURSDAY
Partly sunny. Cooler with highs in the mid 60s.
THURSDAY NIGHT
Mostly clear. Lows in the mid 40s.
FRIDAY
Partly sunny. Highs in the lower 60s.
FRIDAY NIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 40s.
SATURDAY
Mostly cloudy with a 50 percent chance of showers. Highs in the upper 50s.
SATURDAY NIGHT
Mostly cloudy with a 50 percent chance of showers. Lows in the mid 40s.
SUNDAY
Mostly cloudy with a 50 percent chance of showers. Highs in the lower 60s.

Visible Weather Satellite
PORTSMOUTH, NH 03801
Infrared Weather Satellite
PORTSMOUTH, NH 03801
NEXRAD Weather Radar
PORTSMOUTH, NH 03801

PORTSMOUTH, NH 3 hourly weather forecast

weather forecast created  8:00 PM EDT  5/17/2026
Monday
18 MAY 2026
PORTSMOUTH, NH 03801 weather forecast Day 1, 0 hours 2 AM 57° 58° Mostly Cloudy 1%

0% Thunder
( 1% severe)
  CALM 72% 48°
Low 52° PORTSMOUTH, NH 03801 weather forecast Day 1, 3 hours 5 AM 53° 53° Partly Cloudy   CALM 77% 46°
High 67° PORTSMOUTH, NH 03801 weather forecast Day 1, 6 hours 8 AM 58° 59° Mostly Cloudy 3%

0% Thunder
( 1% severe)
E   2 64% 46°

Mostly Cloudy



PORTSMOUTH, NH 03801 weather forecast Day 1, 9 hours 11 AM 62° 62° Mostly Cloudy ESE   7 50% 43°
PORTSMOUTH, NH 03801 weather forecast Day 1, 12 hours 2 PM 63° 62° Partly Cloudy 2%

0% Thunder
( 4% severe)
SE   10 48% 43°
PORTSMOUTH, NH 03801 weather forecast Day 1, 15 hours 5 PM 62° 61° Partly Cloudy SE   9 54% 45°
PORTSMOUTH, NH 03801 weather forecast Day 1, 18 hours 8 PM 58° 57° Partly Cloudy 3%

0% Thunder
( 7% severe)
ESE   6 69% 48°
PORTSMOUTH, NH 03801 weather forecast Day 1, 21 hours 11 PM 57° 58° Clear   CALM 80% 51°
Tuesday
19 MAY 2026
PORTSMOUTH, NH 03801 weather forecast Day 2, 0 hours 2 AM 58° 58° Partly Cloudy 3%

0% Thunder
( 7% severe)
SSW   3 83% 53°
Low 55° PORTSMOUTH, NH 03801 weather forecast Day 2, 3 hours 5 AM 60° 60° Partly Cloudy WSW   6 84% 55°
High 90° PORTSMOUTH, NH 03801 weather forecast Day 2, 6 hours 8 AM 68° 68° Partly Cloudy 1%

0% Thunder
( 3% severe)
WSW   5 73% 59°

Partly Cloudy



PORTSMOUTH, NH 03801 weather forecast Day 2, 9 hours 11 AM 82° 83° Partly Cloudy SW   8 53% 63°
PORTSMOUTH, NH 03801 weather forecast Day 2, 12 hours 2 PM 88° 88° Mostly Cloudy 13%
RAIN
<.01 in
0% Thunder
( 10% severe)
WSW   12 40% 61°
PORTSMOUTH, NH 03801 weather forecast Day 2, 15 hours 5 PM 86° 87° Partly Cloudy WSW   12 46% 63°
PORTSMOUTH, NH 03801 weather forecast Day 2, 18 hours 8 PM 79° 80° Partly Cloudy 3%

0% Thunder
( 5% severe)
WSW   8 54% 61°
PORTSMOUTH, NH 03801 weather forecast Day 2, 21 hours 11 PM 73° 73° Partly Cloudy SW   8 68% 62°

PORTSMOUTH, NH extended weather forecast

Wednesday
20 MAY 2026
Thursday
21 MAY 2026
Friday
22 MAY 2026
Saturday
23 MAY 2026
Sunday
24 MAY 2026
Low 67° Low 51° Low 44° Low 48° Low 44°
High 88° High 62° High 68° High 65° High 64°
PORTSMOUTH, NH 03801 weather forecast Day 3 PORTSMOUTH, NH 03801 weather forecast Day 4 PORTSMOUTH, NH 03801 weather forecast Day 5 PORTSMOUTH, NH 03801 weather forecast Day 6 PORTSMOUTH, NH 03801 weather forecast Day 7
Partly Cloudy
33% Rain
Partly Cloudy
7% Rain
Partly Cloudy
7% Rain
Partly Cloudy
10% Rain
Overcast
18% Rain
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