Weather in Grantham, NH
Updated 2026-09-26 10:00 local time · ZIP codes 03753
Light drizzle
No government weather alerts were returned for this location at the latest update.
Next hours
52°66% rain51°57% rain
53°29% rain54°42% rain53°49% rain
54°81% rain50°72% rain
50°76% rain52°57% rain
51°34% rain
52°72% rain52°62% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance reaches about 81% over the next 12 hours.
It feels like 47°F with winds near 11 mph.
53°F, 29% rain chance and 10 mph wind.
Visibility is around 1 mi; gusts may reach 35 mph.
Current temperature is 52°F, wind 11 mph, rain chance up to 81%.
UV index is 2.
Local weather characteristics in Grantham
New Hampshire has four distinct seasons, cold snowy winters and mild to warm summers. Mountain weather can be much colder and windier than nearby valleys.
Grantham is part of the Northeast weather region. The forecast point is near 43.49°N latitude and 72.14°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Grantham weather today
Light drizzle and 52°F in Grantham, NH. Today's high is 56°F with a 88% rain chance. Winds are around 11 mph with gusts near 29 mph. Relative humidity is 82%, pressure is 30.05 inHg, and visibility is about 1 miles.
Tonight and tomorrow in Grantham
Sunrise is at 06:40 AM and sunset is at 06:39 PM. Tomorrow's forecast calls for Light rain with a high near 51°F and a low near 49°F. The maximum rain chance is 94%.