National Weather Service Forecast for: Portsmouth NH
Issued by: National Weather Service Gray/Portland, ME
Updated: 7:24 am EDT May 4, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 69. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Sunny and
Breezy

 Tonight

Tonight: Mostly clear, with a low around 49. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.
Mostly Clear

 Tuesday

Tuesday: Mostly sunny, with a high near 75. South wind 10 to 15 mph, with gusts as high as 30 mph.
Mostly Sunny

 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 55. South wind around 10 mph, with gusts as high as 20 mph.
Mostly Cloudy

 Wednesday

Wednesday: Showers likely, mainly after 5pm. Mostly cloudy, with a high near 66. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Chance
Showers then
Showers
Likely
 Wednesday
Night
Wednesday Night: Showers, mainly before 2am. Low around 47. Chance of precipitation is 80%.
Showers

 Thursday

Thursday: A 40 percent chance of showers. Partly sunny, with a high near 60.
Chance
Showers

 Thursday
Night
Thursday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 44.
Chance
Showers

 Friday

Friday: Mostly sunny, with a high near 60.
Mostly Sunny
Hi 69 °F Lo 49 °F Hi 75 °F Lo 55 °F Hi 66 °F Lo 47 °F Hi 60 °F Lo 44 °F Hi 60 °F

 

This Afternoon
 
 Sunny, with a high near 69. Breezy, with a west wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
 
 Mostly clear, with a low around 49. Southwest wind 5 to 10 mph, with gusts as high as 25 mph.
Tuesday
 
 Mostly sunny, with a high near 75. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
 
 Mostly cloudy, with a low around 55. South wind around 10 mph, with gusts as high as 20 mph.
Wednesday
 
 Showers likely, mainly after 5pm. Mostly cloudy, with a high near 66. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday Night
 
 Showers, mainly before 2am. Low around 47. Chance of precipitation is 80%.
Thursday
 
 A 40 percent chance of showers. Partly sunny, with a high near 60.
Thursday Night
 
 A 40 percent chance of showers. Mostly cloudy, with a low around 44.
Friday
 
 Mostly sunny, with a high near 60.
Friday Night
 
 Mostly clear, with a low around 40.
Saturday
 
 Mostly sunny, with a high near 61.
Saturday Night
 
 Partly cloudy, with a low around 42.
Sunday
 
 A 30 percent chance of showers. Mostly sunny, with a high near 63.

 

Forecast from NOAA-NWS for Portsmouth NH.