Union, NH Weather & Growing Conditions
This Afternoon
65°F
Sunny
Sunny, with a high near 65. Southwest wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 65°F | Sunny | 0 mph | 0% |
| Tonight | 46°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 56°F | Rain | 0 to 5 mph S | 89% |
| Sunday Night | 48°F | Rain | 0 to 5 mph NE | 75% |
| Monday | 66°F | Mostly Sunny | 5 to 10 mph N | 0% |
| Monday Night | 40°F | Mostly Cloudy | 5 mph N | 0% |
| Tuesday | 62°F | Mostly Sunny | 5 mph NE | 0% |
| Tuesday Night | 43°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Wednesday | 61°F | Mostly Sunny | 10 mph NE | 1% |
| Wednesday Night | 42°F | Partly Cloudy | 0 to 5 mph NE | 2% |
| Thursday | 61°F | Slight Chance Rain Showers | 5 to 10 mph NE | 16% |
| Thursday Night | 46°F | Chance Rain Showers | 0 to 15 mph NE | 29% |
| Friday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Friday Night | 49°F | Chance Rain Showers | 10 to 20 mph N | 39% |
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 Sep 20, 2026.