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Town of Grantham, NHGrantham, NH 7-Day Night Weather Forecast
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Grantham, NH Weather Forecast
Grantham, NH Weather Forecast Date: 500 PM EDT Fri Oct 02 2026
The area/counties/county of: Sullivan, including the cities of: Claremont, Cornish, Unity, Croydon, Goshen, Grantham, Lempster, Newport, and Charlestown.or toggle through each period.
Tonight... Mostly cloudy with a chance of showers early, then mostly cloudy with a slight chance of showers this evening. Mostly clear after midnight. Patchy fog after midnight. Lows in the upper 40s. Northwest winds around 10 mph with gusts up to 25 mph this evening, becoming light and variable. Chance of rain 50%.
Saturday... Mostly sunny. Highs in the lower 60s. Light and variable winds.
Saturday Night... Clear. Patchy fog after midnight. Lows in the upper 30s. Light and variable winds.
Sunday... Partly sunny. Highs in the lower 60s. Light and variable winds, becoming southeast around 10 mph in the afternoon.
Sunday Night... Partly cloudy. Lows in the mid 40s. Light and variable winds.
Monday... Partly sunny. Highs around 60.
Monday Night... Mostly clear. Lows in the mid 30s.
Tuesday... Mostly sunny. Highs in the lower 50s.
Tuesday Night... Mostly clear. Lows in the lower 30s.
Wednesday... Mostly sunny. Highs in the upper 50s.
Wednesday Night... Mostly clear. Lows in the upper 30s.
Thursday... Partly sunny. Highs in the lower 60s.
Thursday Night... Partly cloudy. Lows in the lower 40s.
POP = Probability of Precipitation
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