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.