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.

Tonight
45°F
Mostly Clear
Mostly clear, with a low around 45. North wind 0 to 5 mph.

7-day forecast for Union

WhenTempForecastWindPrecip
Tonight 45°F Mostly Clear 0 to 5 mph N 0%
Saturday 65°F Sunny 0 to 5 mph N 0%
Saturday Night 46°F Partly Cloudy 0 mph 0%
Sunday 59°F Rain Showers 0 to 5 mph S 75%
Sunday Night 50°F Rain Showers Likely 0 to 5 mph NE 73%
Monday 65°F Mostly Sunny 5 to 10 mph N 5%
Monday Night 46°F Partly Cloudy 0 to 5 mph NE 1%
Tuesday 60°F Partly Sunny 5 to 10 mph NE 1%
Tuesday Night 44°F Mostly Cloudy 0 to 10 mph NE 1%
Wednesday 60°F Mostly Sunny 10 mph NE 1%
Wednesday Night 44°F Partly Cloudy 0 to 5 mph NE 7%
Thursday 60°F Chance Rain Showers 5 to 10 mph NE 25%
Thursday Night 47°F Chance Rain Showers 0 to 10 mph NE 25%
Friday 63°F Chance Rain Showers 10 mph N 29%

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

Nearby towns & communities

All New Hampshire locations ›

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.