New York, NY 28° Los Angeles, CA 28° Chicago, IL 36° Houston, TX 31° Miami, FL 28° Phoenix, AZ 32° Seattle, WA 23° Denver, CO 33° Toronto, ON 24° Vancouver, BC 19°
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Portsmouth, NH Weather (03801)

ZIP codes: 03801 · 03802 · 03803 · 03804
Current WeatherPortsmouth · 7:23 PM EDT
28° | 17°
27°C
Feels like 27°
Sunny
WindW 2 mph · Gusts 3 mph
Precip75% · 1.05 in
Humidity51% · Dew point 16°
UV index6 High
Air Quality35 Good
Pressure29.74 inHg
Visibility6 mi
Sunrise / Sunset6:10 AM · 7:13 PM · 13h 3m

Weather map — Portsmouth

Full radar →
Now
27°
2%
2 mph
20:00
22°
4%
4 mph
21:00
21°
3%
6 mph
22:00
20°
5%
8 mph
23:00
19°
4%
8 mph
00:00
18°
18%
6 mph
01:00
19°
14%
6 mph
02:00
17°
9%
6 mph
03:00
16°
11%
7 mph
04:00
16°
15%
7 mph
05:00
16°
16%
8 mph
06:00
15°
17%
9 mph
07:00
16°
30%
8 mph
08:00
17°
31%
9 mph
09:00
17°
33%
8 mph
10:00
17°
29%
8 mph
11:00
17°
31%
7 mph
12:00
18°
24%
6 mph
13:00
18°
31%
5 mph
14:00
17°
35%
7 mph
15:00
17°
56%
9 mph
16:00
16°
49%
9 mph
17:00
16°
26%
5 mph
18:00
16°
31%
4 mph

Today · Fri 9/4

High 28°
75% / 1.05 in

Sunny. Winds E at 9 mph.

Tonight · Fri 9/4

Low 15°
3% / –

Sunny. Winds NW at 6 mph.

Tomorrow · Sat 9/5

19° | 15°
65% / 0.05 in

Showers. Winds N at 11 mph.

7-day trend

Portsmouth · temperature + precipitation

10-day forecast

Updated 7:23 PM

Details & indices

Wind
2 mph W
Gusts 3 mph
Humidity
51%
Dew point 16°
Pressure
29.74 inHg
Falling
UV index
6 — High
High today
Air Quality
Good
AQI 35 · US EPA
Allergy
Low
Ragweed
Visibility
6 mi
Clear view
Allergy — Portsmouth

🌿 Conditions right now

View all →
Birch
None
Grass
Low
Oak
None
Alder
None
Hazel
None
Mugwort
Low
Ragweed
Low

Sun & moon

Sunrise6:10 AM
Sunset7:13 PM
Length of day13h 3m
Moonrise11:16 PM
Moonset2:52 PM
Next full moonSep 26 Harvest Moon
Latitude43.0770°N
Longitude-70.7577°E

Water temps nearby

View all →
Hampton Beach (12 mi)68°
Old Orchard Beach (36 mi)66°
Revere Beach (47 mi)70°
🌤️No rain expected in the next 90 minutes
Now+30+60+90 min
Minute-by-minute precip · HRRR nowcast

Daily planner

computed from today's forecast
Laundry day
Fair
Line-drying weather
Grilling
Fair
Fire up the grill
Running
Poor
Lace up outside
Patio
Fair
Dinner outdoors
Data sources · Friday, September 4
Where the Portsmouth forecast comes from
This page blends NOAA/NWS model guidance with global ensembles for the 10-day outlook, air quality and alerts. Data refreshes every hour, current conditions every 15 minutes. Coordinates: 43.0770°N, -70.7577°.
NBM + global weather models
Updated: 7:23 PM
ZIP codes in Portsmouth
📮
03801
Portsmouth
📮
03802
Portsmouth
📮
03803
Portsmouth
📮
03804
Portsmouth
📮
03854
Kittery
Weather in Portsmouth
Over the next 10 days Portsmouth tops out around 28° (Friday) and dips to 8° on the coolest night (Saturday). About 1.5 in of precipitation is expected in total; the most likely wet day is Wednesday (90% chance). Expect a blustery spell — gusts near 37 mph on Wednesday. No active NWS alerts at the moment — quiet on the hazards front. Right now Portsmouth is running about 61° warmer than Springfield. Longer view: classic Northeast mix — nor'easters, humid spells and a glorious fall.
Portsmouth, NH · Elev 20 ft · 43.08°N, 70.76°W · New Hampshire · Forecast computed for these exact coordinates
Powered by NWS/NOAA guidance, multi-model forecasts and official environmental feeds · NOAA/NWS · EPA AirNow · MET Norway · global models
Updated: 7:23 PM