New Hampshire · NWS GYX office

Portsmouth, NH weather

It is 31°F and clear at Pease Air Force Base / Portsmouth as of Oct 28, 4:55 AM EDT. Overnight: Mostly Clear, low near 27°F. Forecast from the National Weather Service, issued Oct 28, 2:31 AM EDT.

Updated Oct 28, 5:29 AM EDT (snapshot)

Current conditions

Temperature

31°F

Clear · feels like 25°F

Wind

NNW 6 mph

Humidity 76% · dew point 24°F

Pressure · visibility

30.46 inHg

Visibility 10 mi

Observed at Pease Air Force Base / Portsmouth (KPSM), Oct 28, 4:55 AM EDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Portsmouth forecast zone right now.

Around the NWS GYX forecast area

No active alerts in zones served by the GYX office near Portsmouth.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. No alerts are active anywhere in New Hampshire.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Portsmouth (local time)
TimeTempForecastPrecip. chanceWind
Wed 7 AM27°FSunny1%N 5 mph
Wed 8 AM29°FSunny1%N 5 mph
Wed 9 AM34°FMostly Sunny2% 0 mph
Wed 10 AM42°FMostly Sunny2% 0 mph
Wed 11 AM47°FMostly Sunny2% 0 mph
Wed 12 PM50°FMostly Sunny2% 0 mph
Wed 1 PM52°FMostly Sunny2% 0 mph
Wed 2 PM52°FPartly Sunny2% 0 mph
Wed 3 PM52°FPartly Sunny2%S 5 mph
Wed 4 PM53°FMostly Sunny3%S 5 mph
Wed 5 PM51°FMostly Sunny3%S 5 mph
Wed 6 PM48°FMostly Clear3% 0 mph
Wed 7 PM46°FMostly Clear2% 0 mph
Wed 8 PM43°FMostly Clear0% 0 mph
Wed 9 PM42°FMostly Clear0% 0 mph
Wed 10 PM41°FMostly Clear0%SW 5 mph
Wed 11 PM41°FMostly Clear0%SW 5 mph
Thu 12 AM40°FPartly Cloudy0%SW 5 mph
Thu 1 AM40°FPartly Cloudy0%SW 5 mph
Thu 2 AM40°FPartly Cloudy0%SW 5 mph
Thu 3 AM40°FPartly Cloudy0%SW 5 mph
Thu 4 AM40°FMostly Clear0%SW 5 mph
Thu 5 AM41°FMostly Clear0%SW 5 mph
Thu 6 AM41°FSunny0%SW 5 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Portsmouth can differ.

7-day forecast

Overnight

Low 27°F

Mostly clear, with a low around 27. North wind around 5 mph.

Wednesday

High 55°F·Low 40°F

Partly sunny, with a high near 55. East wind 0 to 5 mph.

Wednesday Night: Mostly clear, with a low around 40. Southwest wind 0 to 5 mph.

Thursday

High 67°F·Low 52°F

Sunny, with a high near 67. Southwest wind 5 to 10 mph.

Thursday Night: Mostly clear, with a low around 52. Southwest wind around 5 mph.

Friday

High 67°F·Low 35°F

Sunny, with a high near 67.

Friday Night: Mostly clear, with a low around 35.

Saturday

High 55°F·Low 29°F

Sunny, with a high near 55.

Saturday Night: Mostly clear, with a low around 29.

Sunday

High 60°F·Low 39°F

Sunny, with a high near 60.

Sunday Night: Partly cloudy, with a low around 39.

Monday

High 63°F·Low 40°F

A slight chance of rain showers after 1pm. Mostly sunny, with a high near 63.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 40. Chance of precipitation is 30%.

Tuesday

High 58°F

A chance of rain showers. Partly sunny, with a high near 58.

Nearby cities

Larger cities in the area

See every city we cover in New Hampshire, or check all active alerts.

About this forecast

Forecast office
Portsmouth is served by the National Weather Service GYX forecast office, forecast zone NHZ014, county zone NHC015.
Location used
The Census Bureau's internal point for Portsmouth (43.0606, -70.7803), in Rockingham County. Population: 22,938 (2024 estimate), number 7 of the 7 New Hampshire cities on this site.
Radar
Nearest NWS radar: KGYX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/43.0606,-70.7803 (forecast issued Oct 28, 2:31 AM EDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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