Bethlehem, PA Weather & Growing Conditions
Tonight
54°F
Mostly Clear
Mostly clear, with a low around 54. Northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Mostly Clear | 5 mph NE | 0% |
| Saturday | 73°F | Mostly Sunny | 5 mph E | 1% |
| Saturday Night | 59°F | Slight Chance Rain Showers then Patchy Fog | 5 mph SE | 52% |
| Sunday | 71°F | Rain Showers | 5 to 10 mph S | 93% |
| Sunday Night | 58°F | Patchy Fog | 0 to 5 mph W | 93% |
| Monday | 67°F | Chance Rain Showers | 5 to 10 mph NE | 34% |
| Monday Night | 53°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday Night | 51°F | Chance Rain Showers | 10 mph NE | 35% |
| Wednesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Wednesday Night | 50°F | Chance Rain Showers | 10 mph NE | 39% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 10 mph NE | 36% |
| Thursday Night | 51°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 32% |
| Friday | 69°F | Slight Chance Rain Showers | 5 to 10 mph N | 21% |
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 Sep 19, 2026.