Harman US

Union, NH Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Union, a community in Strafford County, New Hampshire.

Overnight
45°F
Mostly Clear
Mostly clear, with a low around 45. Northeast wind around 0 mph.

7-day forecast for Union

WhenTempForecastWindPrecip
Overnight 45°F Mostly Clear 0 mph 0%
Saturday 65°F Sunny 0 to 5 mph N 0%
Saturday Night 45°F Partly Cloudy 0 to 5 mph S 0%
Sunday 58°F Mostly Cloudy then Rain 0 to 5 mph S 80%
Sunday Night 46°F Rain then Rain Showers Likely 0 to 5 mph NE 76%
Monday 65°F Mostly Sunny 5 to 10 mph N 3%
Monday Night 43°F Mostly Cloudy 5 mph N 0%
Tuesday 62°F Partly Sunny 5 mph NE 0%
Tuesday Night 42°F Partly Cloudy 0 to 5 mph NE 0%
Wednesday 62°F Mostly Sunny 5 to 10 mph NE 0%
Wednesday Night 41°F Mostly Cloudy 0 to 5 mph NE 5%
Thursday 60°F Chance Rain Showers 5 to 10 mph NE 30%
Thursday Night 44°F Chance Rain Showers 5 to 15 mph NE 33%
Friday 63°F Chance Rain Showers 10 to 15 mph N 33%

Forecast source: National Weather Service (api.weather.gov) for Union (43.491, -71.023). Updated through the day.

Growing snapshot for Union

Last spring frost
May 16
First fall frost
Sep 30
Growing season
136 days
Hardiness zone
5b

More local growing data for Union: nearby ZIP 03852 weather · frost dates · planting calendar · New Hampshire frost dates

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Climate data from the nearest NOAA station, Sanford 2 Nnw, Me (10.6 mi from Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.