Allentown, PA Weather & Growing Conditions
Today
74°F
Sunny
Sunny, with a high near 74. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Sunny | 0 to 5 mph S | 2% |
| Tonight | 58°F | Mostly Cloudy | 0 to 5 mph S | 9% |
| Thursday | 72°F | Light Rain Likely | 5 to 10 mph S | 72% |
| Thursday Night | 59°F | Light Rain | 0 to 5 mph SW | 81% |
| Friday | 70°F | Light Rain Likely | 0 mph | 55% |
| Friday Night | 48°F | Chance Light Rain then Partly Cloudy | 0 mph | 40% |
| Saturday | 64°F | Mostly Sunny then Slight Chance Light Rain | 0 to 10 mph W | 18% |
| Saturday Night | 41°F | Slight Chance Light Rain | 5 mph W | 18% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph NW | 5% |
| Sunday Night | 37°F | Partly Cloudy | 5 mph W | 4% |
| Monday | 58°F | Sunny | 5 to 10 mph W | 6% |
| Monday Night | 35°F | Mostly Clear | 5 mph W | 4% |
| Tuesday | 63°F | Sunny | 5 to 10 mph W | 3% |
| Tuesday Night | 37°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
Explore more for Allentown, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Allentown Intl Ap, Pa (3.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.