PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

4:55 AM EDT JUL 18, 2026
Overcast
59°F
Feels Like: 59°F
Dewpoint: 54°F
Rel. Hum.: 83%
Visibility: 10 miles
Wind: Calm
Pressure: 29.96 inches
Last 72 hours

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PORTSMOUTH, NH 03803
Weather Forecast

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TODAY
Partly sunny this morning, then mostly cloudy with a chance of showers and thunderstorms this afternoon. Areas of smoke this afternoon. Warm with highs in the mid 80s. Southwest winds 10 to 15 mph. Gusts up to 30 mph this afternoon. Chance of rain 50 percent.
TONIGHT
Mostly cloudy. Showers likely with a chance of thunderstorms in the evening. Areas of smoke in the evening. Humid with lows in the mid 60s. Southwest winds 10 to 15 mph. Gusts up to 30 mph in the evening. Chance of rain 70 percent.
SUNDAY
Mostly sunny. Less humid with highs around 80. Northwest winds 10 to 15 mph with gusts up to 25 mph.
SUNDAY NIGHT
Clear. Lows in the upper 50s. Northwest winds around 10 mph in the evening, becoming light and variable.
MONDAY
Mostly sunny. Highs in the lower 80s. Light and variable winds, becoming south around 10 mph in the afternoon.
MONDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 60s.
TUESDAY
Partly sunny in the morning, then mostly cloudy with a chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.
TUESDAY NIGHT
Showers. Lows in the mid 60s. Chance of rain 80 percent.
WEDNESDAY
Showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 80 percent.
WEDNESDAY NIGHT
Showers likely with a chance of thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the lower 60s. Chance of rain 70 percent.
THURSDAY
Partly sunny. A chance of showers in the morning. Highs in the lower 80s. Chance of rain 30 percent.
THURSDAY NIGHT
Partly cloudy. Lows in the lower 60s.
FRIDAY
Partly 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  7/17/2026
Saturday
18 JUL 2026
PORTSMOUTH, NH 03803 weather forecast Day 1, 0 hours 2 AM 61° 62° Mostly Cloudy 3%

0% Thunder
( 0% severe)
  CALM 70% 51°
Low 58° PORTSMOUTH, NH 03803 weather forecast Day 1, 3 hours 5 AM 59° 60° Mostly Cloudy   CALM 75% 51°
High 88° PORTSMOUTH, NH 03803 weather forecast Day 1, 6 hours 8 AM 67° 67° Partly Cloudy 4%

0% Thunder
( 2% severe)
SSW   1 65% 55°

Mostly Cloudy

Rain Likely

PORTSMOUTH, NH 03803 weather forecast Day 1, 9 hours 11 AM 80° 81° Mostly Cloudy S   10 49% 59°
PORTSMOUTH, NH 03803 weather forecast Day 1, 12 hours 2 PM 85° 86° Mostly Cloudy 60%
RAIN
>2 in
0% Thunder
( 31% severe)
SSW   16 48% 63°
PORTSMOUTH, NH 03803 weather forecast Day 1, 15 hours 5 PM 80° 82° Mostly Cloudy SSW   18 65% 67°
PORTSMOUTH, NH 03803 weather forecast Day 1, 18 hours 8 PM 75° 75° Mostly Cloudy 61%
RAIN
***
0% Thunder
( 25% severe)
SSW   14 82% 69°
PORTSMOUTH, NH 03803 weather forecast Day 1, 21 hours 11 PM 72° 72° Mostly Cloudy SW   12 97% 71°
Sunday
19 JUL 2026
PORTSMOUTH, NH 03803 weather forecast Day 2, 0 hours 2 AM 71° 71° Mostly Cloudy 2%

0% Thunder
( 3% severe)
WSW   10 97% 70°
Low 66° PORTSMOUTH, NH 03803 weather forecast Day 2, 3 hours 5 AM 67° 67° Mostly Cloudy W   12 90% 64°
High 81° PORTSMOUTH, NH 03803 weather forecast Day 2, 6 hours 8 AM 68° 68° Partly Cloudy 0%

0% Thunder
( 0% severe)
WNW   14 70% 58°

Clear



PORTSMOUTH, NH 03803 weather forecast Day 2, 9 hours 11 AM 75° 75° Clear NW   16 48% 54°
PORTSMOUTH, NH 03803 weather forecast Day 2, 12 hours 2 PM 79° 79° Clear 0%

0% Thunder
( 1% severe)
NW   16 41% 53°
PORTSMOUTH, NH 03803 weather forecast Day 2, 15 hours 5 PM 79° 79° Clear WNW   14 36% 50°
PORTSMOUTH, NH 03803 weather forecast Day 2, 18 hours 8 PM 72° 72° Clear 0%

0% Thunder
( 1% severe)
WNW   8 48% 51°
PORTSMOUTH, NH 03803 weather forecast Day 2, 21 hours 11 PM 65° 65° Clear WNW   7 60% 51°

PORTSMOUTH, NH extended weather forecast

Monday
20 JUL 2026
Tuesday
21 JUL 2026
Wednesday
22 JUL 2026
Thursday
23 JUL 2026
Friday
24 JUL 2026
Low 57° Low 62° Low 65° Low 63° Low 59°
High 83° High 78° High 83° High 78° High 75°
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
2% Rain
Mostly Cloudy
27% Rain
Overcast
79% Rain
Partly Cloudy
45% Rain
Partly Cloudy
27% Rain
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