National Weather Service Forecast for: Windham NH
Issued by: National Weather Service Gray/Portland, ME
Updated: 2:25 am EDT Aug 20, 2026
 
Today

Today: Increasing clouds, with a high near 85. Calm wind becoming northwest around 5 mph.
Increasing
Clouds
 Tonight

Tonight: A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 58. West wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers then
Mostly Cloudy
 Friday

Friday: A 30 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 78. Northeast wind around 5 mph. New precipitation amounts of less than a tenth of an inch possible.
Chance
Showers
 Friday
Night
Friday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 57. East wind around 5 mph becoming calm.
Partly Cloudy
then Chance
Showers
 Saturday

Saturday: Showers, mainly after 9am. High near 72. East wind around 5 mph. Chance of precipitation is 80%.
Showers

 Saturday
Night
Saturday Night: Showers, mainly before 1am. Low around 58. Chance of precipitation is 80%.
Showers

 Sunday

Sunday: A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 80.
Mostly Cloudy
then Chance
Showers
 Sunday
Night
Sunday Night: A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 59.
Chance
Showers then
Mostly Cloudy
 Monday

Monday: Mostly sunny, with a high near 81.
Mostly Sunny
Hi 85 °F Lo 58 °F Hi 78 °F Lo 57 °F Hi 72 °F Lo 58 °F Hi 80 °F Lo 59 °F Hi 81 °F

 

Today
 
 Increasing clouds, with a high near 85. Calm wind becoming northwest around 5 mph.
Tonight
 
 A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 58. West wind around 5 mph becoming calm. New precipitation amounts of less than a tenth of an inch possible.
Friday
 
 A 30 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 78. Northeast wind around 5 mph. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
 
 A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 57. East wind around 5 mph becoming calm.
Saturday
 
 Showers, mainly after 9am. High near 72. East wind around 5 mph. Chance of precipitation is 80%.
Saturday Night
 
 Showers, mainly before 1am. Low around 58. Chance of precipitation is 80%.
Sunday
 
 A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 80.
Sunday Night
 
 A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 59.
Monday
 
 Mostly sunny, with a high near 81.
Monday Night
 
 Mostly clear, with a low around 55.
Tuesday
 
 Sunny, with a high near 80.
Tuesday Night
 
 Mostly clear, with a low around 55.
Wednesday
 
 Sunny, with a high near 82.

 

Forecast from NOAA-NWS for Windham NH.