Bethlehem, PA Weather & Growing Conditions
Tonight
49°F
Mostly Clear
Mostly clear, with a low around 49. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Mostly Clear | 0 to 5 mph S | 2% |
| Wednesday | 74°F | Patchy Fog then Sunny | 0 to 10 mph SW | 3% |
| Wednesday Night | 59°F | Mostly Cloudy | 5 mph S | 9% |
| Thursday | 72°F | Light Rain Likely | 5 to 10 mph S | 68% |
| Thursday Night | 60°F | Light Rain Likely | 0 to 5 mph SW | 67% |
| Friday | 70°F | Light Rain Likely | 0 to 5 mph W | 67% |
| Friday Night | 50°F | Light Rain Likely | 0 to 5 mph NW | 63% |
| Saturday | 65°F | Slight Chance Light Rain | 5 to 10 mph NW | 23% |
| Saturday Night | 41°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 17% |
| Sunday | 60°F | Mostly Sunny | 5 mph W | 13% |
| Sunday Night | 38°F | Slight Chance Light Rain | 5 mph W | 19% |
| Monday | 60°F | Chance Light Rain | 5 to 15 mph NW | 25% |
| Monday Night | 37°F | Slight Chance Light Rain | 5 mph W | 20% |
| Tuesday | 62°F | Slight Chance Light Rain then Mostly Sunny | 5 to 15 mph W | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bethlehem, PA
Last spring frost
Apr 21
First fall frost
Oct 22
Growing season
184 days
Hardiness zone
7a
Explore more for Bethlehem, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Springtown 1 Nne, Pa (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.