Alton, NH Weather & Growing Conditions
Today
82°F
Sunny
Sunny, with a high near 82. West wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Sunny | 5 to 10 mph W | 0% |
| Tonight | 61°F | Mostly Clear | 0 to 5 mph W | 0% |
| Wednesday | 84°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 66°F | Mostly Cloudy | 0 to 5 mph SW | 5% |
| Thursday | 85°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 43% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 38% |
| Friday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 23% |
| Friday Night | 68°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 22% |
| Saturday | 84°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph W | 44% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 39% |
| Sunday | 85°F | Sunny | 5 to 10 mph W | 8% |
| Sunday Night | 67°F | Mostly Clear | 5 mph W | 7% |
| Monday | 85°F | Sunny then Slight Chance Rain Showers | 5 to 10 mph W | 16% |
| Monday Night | 65°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 10 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Alton, NH
Last spring frost
Apr 30
First fall frost
Oct 18
Growing season
170 days
Hardiness zone
5b
Explore more for Alton, NH: full frost dates · planting calendar · New Hampshire frost dates
Climate data from the nearest NOAA station, Lakeport 2, Nh (16.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.