National Weather Service Forecast for: Portsmouth NH
Issued by: National Weather Service Gray/Portland, ME
Updated: 5:30 am EDT Jun 22, 2026
 
Today

Today: Showers likely, mainly after 5pm. Mostly cloudy, with a high near 76. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Mostly Cloudy
then Showers
Likely
 Tonight

Tonight: Rain and possibly a thunderstorm before 11pm, then showers likely and possibly a thunderstorm between 11pm and midnight, then rain and possibly a thunderstorm after midnight. Patchy fog between 4am and 5am. Low around 57. East wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and
Patchy Fog
 Tuesday

Tuesday: Rain before 11am, then showers likely, mainly between 11am and 1pm. High near 77. South wind around 5 mph becoming northwest in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Rain

 Tuesday
Night
Tuesday Night: Patchy fog between 9pm and 10pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 59. Calm wind becoming northwest around 5 mph.
Patchy Fog
then Mostly
Clear
 Wednesday

Wednesday: Sunny, with a high near 79. West wind around 5 mph.
Sunny

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

 Thursday

Thursday: Mostly sunny, with a high near 81.
Mostly Sunny

 Thursday
Night
Thursday Night: A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 61.
Mostly Cloudy
then Chance
Showers
 Friday

Friday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
Showers
Likely
Hi 76 °F Lo 57 °F Hi 77 °F Lo 59 °F Hi 79 °F Lo 60 °F Hi 81 °F Lo 61 °F Hi 80 °F

 

Today
 
 Showers likely, mainly after 5pm. Mostly cloudy, with a high near 76. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
 
 Rain and possibly a thunderstorm before 11pm, then showers likely and possibly a thunderstorm between 11pm and midnight, then rain and possibly a thunderstorm after midnight. Patchy fog between 4am and 5am. Low around 57. East wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
 
 Rain before 11am, then showers likely, mainly between 11am and 1pm. High near 77. South wind around 5 mph becoming northwest in the morning. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday Night
 
 Patchy fog between 9pm and 10pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 59. Calm wind becoming northwest around 5 mph.
Wednesday
 
 Sunny, with a high near 79. West wind around 5 mph.
Wednesday Night
 
 Mostly clear, with a low around 60.
Thursday
 
 Mostly sunny, with a high near 81.
Thursday Night
 
 A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 61.
Friday
 
 Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 50%.
Saturday
 
 Mostly sunny, with a high near 82.
Saturday Night
 
 Partly cloudy, with a low around 63.
Sunday
 
 Sunny, with a high near 83.

 

Forecast from NOAA-NWS for Portsmouth NH.