Alton, NH Weather & Growing Conditions
This Afternoon
60°F
Sunny
Sunny, with a high near 60. Northwest wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 60°F | Sunny | 0 mph | 0% |
| Tonight | 46°F | Partly Cloudy | 0 to 10 mph S | 0% |
| Sunday | 54°F | Mostly Cloudy then Rain | 5 to 10 mph S | 86% |
| Sunday Night | 47°F | Rain then Rain Showers Likely | 5 to 10 mph NE | 77% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph N | 2% |
| Monday Night | 44°F | Mostly Cloudy | 5 to 10 mph N | 0% |
| Tuesday | 56°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 43°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Wednesday | 57°F | Mostly Sunny | 10 mph NE | 0% |
| Wednesday Night | 43°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 56°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Thursday Night | 45°F | Chance Rain Showers | 5 to 15 mph NE | 32% |
| Friday | 58°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Friday Night | 47°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
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 (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.