National Weather Service Forecast for: Portsmouth NH
Issued by: National Weather Service Gray/Portland, ME
Updated: 9:57 pm EDT Jul 9, 2025
 
Tonight

Tonight: Showers likely, mainly after 5am.  Patchy fog.  Otherwise, cloudy, with a low around 63. Calm wind.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Showers
Likely and
Patchy Fog

Thursday

Thursday: Showers likely, with thunderstorms also possible after 2pm.  Areas of fog before 9am.  Otherwise, cloudy, with a high near 70. East wind around 5 mph.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely and
Areas Fog
then Chance
Showers
Thursday
Night
Thursday Night: Cloudy, with a low around 62. Northeast wind around 5 mph becoming calm.
Cloudy


Friday

Friday: Partly sunny, with a high near 76. Calm wind becoming east around 5 mph.
Partly Sunny


Friday
Night
Friday Night: Mostly cloudy, with a low around 63. Calm wind.
Mostly Cloudy


Saturday

Saturday: Partly sunny, with a high near 79.
Partly Sunny


Saturday
Night
Saturday Night: Partly cloudy, with a low around 64.
Partly Cloudy


Sunday

Sunday: Partly sunny, with a high near 80.
Partly Sunny


Sunday
Night
Sunday Night: Mostly cloudy, with a low around 66.
Mostly Cloudy


Lo 63 °F Hi 70 °F Lo 62 °F Hi 76 °F Lo 63 °F Hi 79 °F Lo 64 °F Hi 80 °F Lo 66 °F

 

Tonight
 
Showers likely, mainly after 5am. Patchy fog. Otherwise, cloudy, with a low around 63. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
 
Showers likely, with thunderstorms also possible after 2pm. Areas of fog before 9am. Otherwise, cloudy, with a high near 70. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
Cloudy, with a low around 62. Northeast wind around 5 mph becoming calm.
Friday
 
Partly sunny, with a high near 76. Calm wind becoming east around 5 mph.
Friday Night
 
Mostly cloudy, with a low around 63. Calm wind.
Saturday
 
Partly sunny, with a high near 79.
Saturday Night
 
Partly cloudy, with a low around 64.
Sunday
 
Partly sunny, with a high near 80.
Sunday Night
 
Mostly cloudy, with a low around 66.
Monday
 
Partly sunny, with a high near 85.
Monday Night
 
Mostly cloudy, with a low around 67.
Tuesday
 
Partly sunny, with a high near 86.
Tuesday Night
 
Partly cloudy, with a low around 67.
Wednesday
 
Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Portsmouth NH.