Alton, NH Weather & Growing Conditions
This Afternoon
72°F
Mostly Sunny
Mostly sunny. High near 72, with temperatures falling to around 64 in the afternoon. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Sunny | 5 mph SW | 1% |
| Tonight | 52°F | Partly Cloudy | 5 mph SW | 1% |
| Thursday | 66°F | Rain Showers Likely | 5 to 10 mph SW | 55% |
| Thursday Night | 57°F | Chance Rain Showers | 0 to 10 mph SW | 30% |
| Friday | 66°F | Chance Light Rain | 0 to 5 mph SW | 48% |
| Friday Night | 51°F | Chance Light Rain | 0 to 5 mph NE | 50% |
| Saturday | 59°F | Chance Light Rain | 5 mph NE | 42% |
| Saturday Night | 43°F | Light Rain Likely | 5 to 10 mph N | 57% |
| Sunday | 53°F | Chance Light Rain | 10 to 15 mph NW | 47% |
| Sunday Night | 38°F | Partly Cloudy | 10 mph W | 7% |
| Monday | 49°F | Mostly Sunny | 10 to 15 mph W | 12% |
| Monday Night | 34°F | Partly Cloudy | 5 to 10 mph W | 7% |
| Tuesday | 54°F | Mostly Sunny | 10 to 15 mph W | 4% |
| Tuesday Night | 35°F | Partly Cloudy | 10 mph W | 2% |
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 Nov 5, 2026.