National Weather Service Forecast for: Portsmouth NH
Issued by: National Weather Service Gray/Portland, ME
Updated: 2:35 pm EDT Jul 28, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 75. Southeast wind around 10 mph.
Slight Chance
T-storms

 Tonight

Tonight: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 65. South wind around 5 mph.
Patchy Fog


 Wednesday

Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 75. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Slight Chance
T-storms and
Patchy Fog
then Showers
Likely
 Wednesday
Night
Wednesday Night: Showers. Low around 59. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Showers


 Thursday

Thursday: Showers. High near 72. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Showers


 Thursday
Night
Thursday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Showers
Likely then
Mostly Cloudy

 Friday

Friday: Mostly sunny, with a high near 79.
Mostly Sunny


 Friday
Night
Friday Night: Mostly clear, with a low around 60.
Mostly Clear


 Saturday

Saturday: Mostly sunny, with a high near 81.
Mostly Sunny
Hi 75 °F Lo 65 °F Hi 75 °F Lo 59 °F Hi 72 °F Lo 60 °F Hi 79 °F Lo 60 °F Hi 81 °F

 

This Afternoon
 
 A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 75. Southeast wind around 10 mph.
Tonight
 
 Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 65. South wind around 5 mph.
Wednesday
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 75. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
 
 Showers. Low around 59. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Thursday
 
 Showers. High near 72. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Thursday Night
 
 Showers likely, mainly before 8pm. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Friday
 
 Mostly sunny, with a high near 79.
Friday Night
 
 Mostly clear, with a low around 60.
Saturday
 
 Mostly sunny, with a high near 81.
Saturday Night
 
 Partly cloudy, with a low around 63.
Sunday
 
 Partly sunny, with a high near 83.
Sunday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 64.
Monday
 
 A 40 percent chance of showers. Partly sunny, with a high near 81.
Monday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 63.
Tuesday
 
 Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Portsmouth NH.