Allentown, PA Weather & Growing Conditions
Today
73°F
Mostly Sunny
Mostly sunny, with a high near 73. South wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 0 to 10 mph S | 2% |
| Tonight | 57°F | Mostly Cloudy | 5 mph S | 11% |
| Thursday | 71°F | Light Rain Likely | 5 to 10 mph S | 73% |
| Thursday Night | 59°F | Light Rain | 0 to 5 mph SW | 79% |
| Friday | 69°F | Chance Light Rain | 0 mph | 53% |
| Friday Night | 48°F | Chance Light Rain then Partly Cloudy | 0 mph | 38% |
| Saturday | 63°F | Mostly Sunny then Slight Chance Light Rain | 5 to 10 mph W | 19% |
| Saturday Night | 41°F | Slight Chance Light Rain | 5 to 10 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 | 35°F | Mostly Clear | 5 mph W | 4% |
| Tuesday | 62°F | Sunny | 5 to 10 mph W | 3% |
| Tuesday Night | 36°F | Mostly Clear | 5 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Allentown, PA
Last spring frost
Apr 20
First fall frost
Oct 24
Growing season
184 days
Hardiness zone
7a
Explore more for Allentown, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Allentown Intl Ap, Pa (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.