PORTSMOUTH, NH 03803 Weather Forecast & Current Conditions

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03803 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)

CURRENT WEATHER
PORTSMOUTH, NH Current Weather
9:55 AM EDT AUG 18, 2026
Overcast 70°F
Feels Like:	70°F
Dewpoint:	66°F
Rel. Hum.:	87%
Visibility:	7 miles
Wind:	E at 5 mph
Pressure:	29.87 inches
Last 72 hours
Local Area Snow Depth
New Hampshire Current Weather
New Hampshire MOS Forecast Weather

Weather Map

(Automated weather data from NWS/FAA)

03803 WEATHER FORECAST
10-Day model forecast maps 2026 Hurricanes	PORTSMOUTH, NH 03803 Weather Forecast	Snowfall Forecast pages Snow Depth pages

TODAY
Mostly cloudy this morning, then partly sunny with a slight chance of showers and thunderstorms this afternoon. Highs in the upper 70s. Light and variable winds. Chance of rain 20 percent.

TONIGHT
Partly cloudy in the evening, then becoming mostly cloudy. Patchy fog. Humid with lows in the lower 60s. Light and variable winds.

WEDNESDAY
Mostly cloudy in the morning, then clearing. Humid with highs in the mid 80s. Light and variable winds.

WEDNESDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s. Light and variable winds.

THURSDAY
Partly sunny. Highs in the lower 80s. Light and variable winds.

THURSDAY NIGHT
Partly cloudy. Lows in the lower 60s.

FRIDAY
Partly sunny. Highs in the upper 70s.

FRIDAY NIGHT
Mostly clear in the evening, then becoming partly cloudy. Lows around 60.

SATURDAY
Partly sunny. A chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 40 percent.

SATURDAY NIGHT
Partly cloudy with a chance of showers in the evening, then showers likely after midnight. Lows in the lower 60s. Chance of rain 60 percent.

SUNDAY
Showers likely. Highs in the upper 70s. Chance of rain 60 percent.

SUNDAY NIGHT
Partly cloudy with a 50 percent chance of showers. Lows around 60.

MONDAY
Partly sunny. A chance of showers in the afternoon. Highs around 80. Chance of rain 30 percent.

03803 WEATHER SATELLITE LOOPS

Visible Weather Satellite
PORTSMOUTH, NH 03803

Infrared Weather Satellite
PORTSMOUTH, NH 03803

03803 WEATHER RADAR LOOP

NEXRAD Weather Radar
PORTSMOUTH, NH 03803

MOS COMPUTER WEATHER FORECAST

PORTSMOUTH, NH 3 hourly weather forecast

weather forecast created 8:00 PM EDT 8/17/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

Tuesday
18 AUG 2026

2 AM

66°

66°

Mostly Cloudy

2%

0% Thunder
( 4% severe)

CALM

100%

66°

Low 65°

5 AM

66°

66°

Mostly Cloudy

CALM

100%

66°

High 80°

8 AM

68°

68°

Mostly Cloudy

6%

0% Thunder
( 7% severe)

CALM

97%

67°

Mostly Cloudy

Chance of Rain

11 AM

75°

75°

Mostly Cloudy

ENE 5

79%

68°

2 PM

77°

79°

Mostly Cloudy

33%
RAIN
1–2 in

0% Thunder
( 13% severe)

E 7

74%

68°

5 PM

76°

77°

Partly Cloudy

E 6

74%

67°

8 PM

70°

70°

Partly Cloudy

14%
RAIN
<.01 in

0% Thunder
( 6% severe)

SE 2

87%

66°

11 PM

66°

66°

Mostly Cloudy

CALM

100%

66°

Wednesday
19 AUG 2026

2 AM

66°

66°

Mostly Cloudy

10%
RAIN
<.01 in

0% Thunder
( 0% severe)

CALM

100%

66°

Low 64°

5 AM

64°

66°

Mostly Cloudy

CALM

100%

64°

High 85°

8 AM

67°

67°

Mostly Cloudy

0%

0% Thunder
( 2% severe)

CALM

93%

65°

Mostly Cloudy

11 AM

79°

81°

Mostly Cloudy

WSW 3

60%

64°

2 PM

82°

83°

Partly Cloudy

7%

0% Thunder
( 2% severe)

SSW 8

51%

62°

5 PM

82°

83°

Partly Cloudy

S 9

51%

62°

8 PM

74°

74°

Partly Cloudy

0%

0% Thunder
( 1% severe)

SSW 6

69%

63°

11 PM

69°

69°

Partly Cloudy

W 5

78%

62°


PORTSMOUTH, NH extended weather forecast
Thursday 20 AUG 2026	Friday 21 AUG 2026	Saturday 22 AUG 2026	Sunday 23 AUG 2026	Monday 24 AUG 2026
Low 64°	Low 56°	Low 56°	Low 58°	Low 57°
High 73°	High 78°	High 77°	High 70°	High 78°

Mostly Cloudy 81% Rain	Partly Cloudy 23% Rain	Partly Cloudy 22% Rain	Mostly Cloudy 70% Rain	Overcast 59% Rain

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