Loudon, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Loudon, a community in Merrimack County, New Hampshire.
This Afternoon
69°F
Isolated Rain Showers
Isolated rain showers between 4pm and 5pm. Mostly cloudy. High near 69, with temperatures falling to around 63 in the afternoon. South wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Loudon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Isolated Rain Showers | 5 mph S | 16% |
| Tonight | 45°F | Mostly Cloudy | 0 mph | 8% |
| Wednesday | 75°F | Mostly Sunny | 0 to 5 mph SW | 5% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Thursday | 70°F | Scattered Rain Showers | 5 to 10 mph S | 44% |
| Thursday Night | 57°F | Isolated Rain Showers | 0 to 5 mph SW | 22% |
| Friday | 67°F | Light Rain Likely | 0 mph | 64% |
| Friday Night | 51°F | Light Rain | 0 to 5 mph NE | 80% |
| Saturday | 61°F | Light Rain Likely | 5 mph N | 69% |
| Saturday Night | 40°F | Chance Light Rain | 5 mph NW | 52% |
| Sunday | 57°F | Chance Light Rain | 5 to 10 mph W | 26% |
| Sunday Night | 33°F | Partly Cloudy | 5 mph W | 12% |
| Monday | 54°F | Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Monday Night | 31°F | Slight Chance Light Rain | 5 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Loudon (43.282, -71.465). Updated through the day.
Growing snapshot for Loudon
Last spring frost
May 8
First fall frost
Oct 3
Growing season
146 days
Hardiness zone
5b
More local growing data for Loudon: nearby ZIP 03307 weather · frost dates · planting calendar · New Hampshire frost dates
Nearby towns & communities
Bradford
Concord
Contoocook
Franklin
Henniker
Hooksett
New London
Pittsfield
Suncook
Tilton Northfield
Warner
Climate data from the nearest NOAA station, Concord Muni Ap, Nh (10 mi from Loudon). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.