Bethlehem, PA Weather & Growing Conditions
Today
73°F
Mostly Sunny
Mostly sunny, with a high near 73. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 0 to 5 mph S | 1% |
| Tonight | 57°F | Mostly Cloudy | 0 to 5 mph SE | 9% |
| Thursday | 71°F | Light Rain | 5 to 10 mph S | 75% |
| Thursday Night | 59°F | Light Rain | 0 to 5 mph SW | 80% |
| Friday | 69°F | Light Rain Likely | 0 mph | 55% |
| Friday Night | 48°F | Chance Light Rain | 0 mph | 41% |
| Saturday | 63°F | Mostly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Saturday Night | 40°F | Slight Chance Light Rain | 5 mph W | 19% |
| Sunday | 59°F | Mostly Sunny | 5 to 10 mph NW | 5% |
| Sunday Night | 36°F | Mostly Clear | 5 mph W | 4% |
| Monday | 58°F | Sunny | 5 to 15 mph W | 6% |
| Monday Night | 34°F | Mostly Clear | 5 mph W | 4% |
| Tuesday | 62°F | Sunny | 5 to 10 mph W | 3% |
| Tuesday Night | 35°F | Mostly Clear | 5 mph W | 0% |
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 (3.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.