Bethlehem, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bethlehem, a community in Grafton County, New Hampshire.
Overnight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. Southwest wind around 5 mph.
7-day forecast for Bethlehem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 5 mph SW | 2% |
| Wednesday | 71°F | Partly Sunny | 0 to 5 mph SW | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph S | 2% |
| Thursday | 65°F | Light Rain | 5 mph S | 85% |
| Thursday Night | 51°F | Light Rain | 0 to 5 mph SW | 80% |
| Friday | 64°F | Chance Light Rain then Mostly Cloudy | 0 mph | 45% |
| Friday Night | 46°F | Light Rain Likely | 0 mph | 61% |
| Saturday | 57°F | Chance Light Rain | 0 mph | 54% |
| Saturday Night | 37°F | Light Rain Likely | 0 to 5 mph N | 55% |
| Sunday | 49°F | Chance Light Rain | 0 to 5 mph NW | 40% |
| Sunday Night | 30°F | Mostly Cloudy then Slight Chance Light Rain | 0 to 5 mph W | 24% |
| Monday | 44°F | Chance Light Rain | 5 to 10 mph W | 36% |
| Monday Night | 27°F | Chance Light Rain then Mostly Cloudy | 5 mph W | 28% |
| Tuesday | 47°F | Partly Sunny then Chance Light Rain | 5 to 10 mph SW | 29% |
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 Nov 4, 2026.