Union, NH Weather & Growing Conditions
Tonight
53°F
Partly Cloudy
Partly cloudy, with a low around 53. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Partly Cloudy | 5 mph SW | 1% |
| Thursday | 67°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SW | 53% |
| Thursday Night | 58°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SW | 27% |
| Friday | 67°F | Chance Light Rain | 0 to 5 mph S | 49% |
| Friday Night | 52°F | Chance Light Rain | 0 to 5 mph NE | 52% |
| Saturday | 60°F | Chance Light Rain | 5 mph NE | 44% |
| Saturday Night | 44°F | Light Rain Likely | 5 to 10 mph N | 55% |
| Sunday | 54°F | Chance Light Rain | 10 to 15 mph NW | 46% |
| Sunday Night | 39°F | Partly Cloudy | 10 mph W | 7% |
| Monday | 51°F | Mostly Sunny | 10 to 15 mph W | 11% |
| Monday Night | 35°F | Partly Cloudy | 10 mph W | 8% |
| Tuesday | 54°F | Mostly Sunny | 10 to 15 mph W | 4% |
| Tuesday Night | 37°F | Partly Cloudy | 10 mph W | 2% |
| Veterans Day | 51°F | Mostly Sunny | 10 to 15 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Union, NH
Last spring frost
May 16
First fall frost
Sep 30
Growing season
136 days
Hardiness zone
5b
Explore more for Union, NH: full frost dates · planting calendar · New Hampshire frost dates
Climate data from the nearest NOAA station, Sanford 2 Nnw, Me (14.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.