Bethlehem, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bethlehem, a community in Grafton County, New Hampshire.
Tonight
49°F
Cloudy
Cloudy, with a low around 49. Southwest wind around 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Bethlehem
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Cloudy | 5 mph SW | 14% |
| Wednesday | 71°F | Partly Sunny | 0 to 5 mph SW | 4% |
| Wednesday Night | 49°F | Partly Cloudy | 0 to 5 mph S | 2% |
| Thursday | 65°F | Light Rain Likely | 5 mph S | 73% |
| Thursday Night | 52°F | Light Rain Likely | 0 to 5 mph SW | 62% |
| Friday | 63°F | Chance Light Rain | 0 mph | 44% |
| Friday Night | 47°F | Light Rain Likely | 0 mph | 72% |
| Saturday | 57°F | Light Rain Likely | 0 mph | 67% |
| Saturday Night | 38°F | Light Rain Likely | 0 to 5 mph W | 64% |
| Sunday | 49°F | Chance Light Rain | 5 mph W | 40% |
| Sunday Night | 31°F | Slight Chance Light Rain | 0 to 5 mph W | 19% |
| Monday | 47°F | Chance Rain And Snow | 5 mph W | 36% |
| Monday Night | 29°F | Chance Rain And Snow | 5 mph W | 34% |
| Tuesday | 47°F | Chance Rain And Snow | 5 to 10 mph SW | 34% |
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.