Union, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Union, a community in Strafford County, New Hampshire.
Today
83°F
Sunny
Sunny, with a high near 83. West wind around 10 mph.
7-day forecast for Union
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 10 mph W | 0% |
| Tonight | 62°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 85°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 66°F | Mostly Cloudy | 0 to 5 mph SW | 5% |
| Thursday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 39% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 34% |
| Friday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 23% |
| Friday Night | 68°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 22% |
| Saturday | 85°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph W | 44% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 39% |
| Sunday | 86°F | Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 69°F | Mostly Clear | 5 mph W | 7% |
| Monday | 86°F | Sunny then Slight Chance Rain Showers | 5 to 10 mph W | 15% |
| Monday Night | 65°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 10 mph W | 15% |
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
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 Aug 4, 2026.