Bethlehem, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bethlehem, a community in Grafton County, New Hampshire.
Today
79°F
Sunny
Sunny, with a high near 79. West wind 5 to 10 mph.
7-day forecast for Bethlehem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 5 to 10 mph W | 0% |
| Tonight | 57°F | Mostly Clear | 0 to 5 mph S | 0% |
| Wednesday | 83°F | Mostly Sunny | 0 to 5 mph SW | 0% |
| Wednesday Night | 62°F | Partly Cloudy | 0 to 5 mph S | 5% |
| Thursday | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 35% |
| Thursday Night | 65°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 mph | 33% |
| Friday | 83°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph W | 46% |
| Friday Night | 63°F | Chance Showers And Thunderstorms | 0 mph | 44% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 0 mph | 50% |
| Saturday Night | 62°F | Chance Showers And Thunderstorms | 0 mph | 45% |
| Sunday | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 19% |
| Sunday Night | 62°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 23% |
| Monday | 82°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 50% |
| Monday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 49% |
Forecast source: National Weather Service (api.weather.gov) for Bethlehem (44.279, -71.689). Updated through the day.
Growing snapshot for Bethlehem
Last spring frost
May 24
First fall frost
Sep 18
Growing season
116 days
Hardiness zone
5a
More local growing data for Bethlehem: nearby ZIP 03574 weather · frost dates · planting calendar · New Hampshire frost dates
Nearby towns & communities
Ashland
Bristol
Canaan
Enfield
Lebanon
Lincoln
Lisbon
Littleton
Mountain Lakes
North Haverhill
North Woodstock
Plymouth
Woodsville
Climate data from the nearest NOAA station, Bethlehem 2, Nh (4 mi from Bethlehem). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.