Loudon, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Loudon, a community in Merrimack County, New Hampshire.
Today
84°F
Sunny
Sunny, with a high near 84. West wind 0 to 10 mph.
7-day forecast for Loudon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 0 to 10 mph W | 0% |
| Tonight | 57°F | Mostly Clear | 0 to 5 mph SW | 0% |
| Wednesday | 86°F | Mostly Sunny | 0 to 5 mph W | 0% |
| Wednesday Night | 64°F | Partly Cloudy | 0 to 5 mph SW | 6% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 41% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 35% |
| Friday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 22% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 21% |
| Saturday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 42% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 37% |
| Sunday | 88°F | Sunny | 0 to 5 mph W | 8% |
| Sunday Night | 66°F | Mostly Clear | 0 to 5 mph W | 7% |
| Monday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph W | 16% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph W | 16% |
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 Aug 4, 2026.