Bethlehem, PA Weather & Growing Conditions
This Afternoon
69°F
Mostly Sunny
Mostly sunny, with a high near 69. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Mostly Sunny | 0 to 5 mph S | 2% |
| Tonight | 47°F | Patchy Fog | 0 mph | 2% |
| Wednesday | 73°F | Patchy Fog then Partly Sunny | 0 to 5 mph S | 2% |
| Wednesday Night | 56°F | Mostly Cloudy | 0 to 5 mph S | 11% |
| Thursday | 72°F | Light Rain Likely | 5 mph S | 71% |
| Thursday Night | 59°F | Light Rain Likely | 0 to 5 mph SW | 71% |
| Friday | 70°F | Light Rain Likely | 0 mph | 71% |
| Friday Night | 50°F | Light Rain Likely | 0 mph | 67% |
| Saturday | 66°F | Slight Chance Light Rain | 0 to 5 mph NW | 23% |
| Saturday Night | 42°F | Slight Chance Light Rain then Partly Cloudy | 0 to 5 mph NW | 20% |
| Sunday | 62°F | Mostly Sunny | 0 to 5 mph NW | 14% |
| Sunday Night | 39°F | Partly Cloudy then Slight Chance Light Rain | 0 mph | 24% |
| Monday | 58°F | Chance Light Rain | 0 to 10 mph NW | 34% |
| Monday Night | 39°F | Chance Light Rain | 5 mph W | 34% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bethlehem, PA
Last spring frost
Apr 20
First fall frost
Oct 24
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, Allentown Intl Ap, Pa (3.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.