NWS Forecast for Londonderry NH

National Weather Service Forecast for: Londonderry NH
Issued by: National Weather Service Gray/Portland, ME

Updated: 2:36 pm EDT Jun 22, 2025

Tonight Mostly Clear	Monday Hot	Monday Night Mostly Clear	Tuesday Hot	Tuesday Night Mostly Clear	Wednesday Sunny	Wednesday Night Partly Cloudy then Chance Showers	Thursday Chance Showers	Thursday Night Chance Showers
Lo 69 °F	Hi 93 °F	Lo 73 °F	Hi 99 °F	Lo 75 °F	Hi 88 °F	Lo 63 °F	Hi 75 °F	Lo 58 °F

Hazardous Weather Outlook
Heat Advisory
Heat Advisory
Extreme Heat Watch

Tonight	Mostly clear, with a low around 69. Northwest wind 5 to 10 mph becoming light in the evening. Winds could gust as high as 20 mph.
Monday	Sunny and hot, with a high near 93. Heat index values as high as 99. Calm wind becoming west around 5 mph.
Monday Night	Mostly clear, with a low around 73. South wind around 5 mph becoming west after midnight.
Tuesday	Sunny and hot, with a high near 99. Heat index values as high as 110. West wind 5 to 10 mph.
Tuesday Night	Mostly clear, with a low around 75. Northwest wind around 5 mph.
Wednesday	Sunny, with a high near 88.
Wednesday Night	A 30 percent chance of showers after 2am. Partly cloudy, with a low around 63.
Thursday	A 40 percent chance of showers. Mostly cloudy, with a high near 75.
Thursday Night	A 40 percent chance of showers. Mostly cloudy, with a low around 58.
Friday	A 50 percent chance of showers. Mostly cloudy, with a high near 69.
Friday Night	Showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Saturday	A 50 percent chance of showers. Mostly cloudy, with a high near 71.
Saturday Night	A 40 percent chance of showers. Mostly cloudy, with a low around 60.
Sunday	Mostly cloudy, with a high near 78.

Forecast from NOAA-NWS for Londonderry NH.