PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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PORTSMOUTH, NH
Current Weather

10:55 PM EDT MAY 18, 2026
Clear
55°F
Feels Like: 55°F
Dewpoint: 48°F
Rel. Hum.: 77%
Visibility: 10 miles
Wind: Calm
Pressure: 30.08 inches
Last 72 hours

Local Area Snow Depth

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PORTSMOUTH, NH 03803
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
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 in the upper 80s. Southwest winds around 10 mph. Chance of rain 20 percent.
TUESDAY NIGHT
Partly cloudy in the evening, then clearing. 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 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
WEDNESDAY NIGHT
Partly cloudy. A chance of showers in the evening. Lows around 50. Chance of rain 30 percent.
THURSDAY
Mostly sunny. Cooler with highs in the mid 60s.
THURSDAY NIGHT
Mostly clear. Lows in the mid 40s.
FRIDAY
Partly sunny. Highs in the mid 60s.
FRIDAY NIGHT
Partly cloudy. A chance of showers after midnight. Lows in the mid 40s. Chance of rain 30 percent.
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 around 60.

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  5/18/2026
Monday
18 MAY 2026
PORTSMOUTH, NH 03803 weather forecast Day 1, 12 hours 2 PM 63° 62° Partly Cloudy 1%

0% Thunder
( 5% severe)
SE   9 50% 44°
High 64° PORTSMOUTH, NH 03803 weather forecast Day 1, 15 hours 5 PM 62° 61° Partly Cloudy ESE   9 56% 46°
Partly Cloudy



PORTSMOUTH, NH 03803 weather forecast Day 1, 18 hours 8 PM 58° 58° Partly Cloudy 3%

0% Thunder
( 6% severe)
E   5 69% 48°
PORTSMOUTH, NH 03803 weather forecast Day 1, 21 hours 11 PM 58° 59° Partly Cloudy   CALM 80% 52°
Tuesday
19 MAY 2026
PORTSMOUTH, NH 03803 weather forecast Day 2, 0 hours 2 AM 58° 59° Partly Cloudy 2%

0% Thunder
( 4% severe)
S   1 83% 53°
Low 55° PORTSMOUTH, NH 03803 weather forecast Day 2, 3 hours 5 AM 60° 60° Partly Cloudy SW   5 87% 56°
High 91° PORTSMOUTH, NH 03803 weather forecast Day 2, 6 hours 8 AM 69° 69° Partly Cloudy 4%

0% Thunder
( 2% severe)
SW   5 76% 61°

Partly Cloudy

Chance of Rain

PORTSMOUTH, NH 03803 weather forecast Day 2, 9 hours 11 AM 83° 84° Partly Cloudy WSW   8 51% 63°
PORTSMOUTH, NH 03803 weather forecast Day 2, 12 hours 2 PM 88° 88° Partly Cloudy 21%
RAIN
.1–.25 in
0% Thunder
( 18% severe)
WSW   12 40% 61°
PORTSMOUTH, NH 03803 weather forecast Day 2, 15 hours 5 PM 86° 87° Partly Cloudy WSW   12 46% 63°
PORTSMOUTH, NH 03803 weather forecast Day 2, 18 hours 8 PM 79° 80° Partly Cloudy 2%

0% Thunder
( 9% severe)
WSW   8 56% 62°
PORTSMOUTH, NH 03803 weather forecast Day 2, 21 hours 11 PM 74° 74° Partly Cloudy SW   8 66% 62°
Wednesday
20 MAY 2026
PORTSMOUTH, NH 03803 weather forecast Day 3, 0 hours 2 AM 72° 72° Partly Cloudy 0%

0% Thunder
( 3% severe)
SW   8 68% 61°
Low 70° PORTSMOUTH, NH 03803 weather forecast Day 3, 3 hours 5 AM 71° 71° Partly Cloudy WSW   9 68% 60°
High 88° PORTSMOUTH, NH 03803 weather forecast Day 3, 6 hours 8 AM 75° 75° Partly Cloudy 10%
RAIN
<.01 in
0% Thunder
( 7% severe)
WSW   9 64% 62°

Partly Cloudy

Chance of Rain

PORTSMOUTH, NH 03803 weather forecast Day 3, 9 hours 11 AM 83° 84° Partly Cloudy WSW   13 51% 63°
PORTSMOUTH, NH 03803 weather forecast Day 3, 15 hours 2 PM 84° 84° Partly Cloudy 29%
RAIN
<.01 in
0% Thunder
( 16% severe)
W   15 46% 61°
PORTSMOUTH, NH 03803 weather forecast Day 3, 18 hours 5 PM 80° 81° Partly Cloudy W   14 51% 60°
PORTSMOUTH, NH 03803 weather forecast Day 3, 21 hours 8 PM 72° 72° Partly Cloudy     WNW   10 53% 54°

PORTSMOUTH, NH extended weather forecast

Thursday
21 MAY 2026
Friday
22 MAY 2026
Saturday
23 MAY 2026
Sunday
24 MAY 2026
Monday
25 MAY 2026
Low 51° Low 44° Low 48° Low 44° Low 46°
High 62° High 68° High 65° High 64° High 66°
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
Partly Cloudy
7% Rain
Partly Cloudy
7% Rain
Partly Cloudy
10% Rain
Overcast
18% Rain
Mostly Cloudy
30% Rain
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