Allentown, PA Weather & Growing Conditions
This Afternoon
74°F
Mostly Sunny
Mostly sunny, with a high near 74. East wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 0 to 5 mph E | 1% |
| Tonight | 58°F | Mostly Cloudy then Chance Rain Showers | 5 mph SE | 27% |
| Sunday | 71°F | Rain Showers | 5 mph S | 94% |
| Sunday Night | 56°F | Showers And Thunderstorms | 5 mph NW | 93% |
| Monday | 69°F | Partly Sunny | 5 to 10 mph NE | 12% |
| Monday Night | 49°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 34% |
| Tuesday Night | 48°F | Chance Rain Showers | 10 mph NE | 32% |
| Wednesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 25% |
| Wednesday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 10 mph NE | 33% |
| Friday | 66°F | Slight Chance Rain Showers | 10 mph N | 24% |
| Friday Night | 49°F | Slight Chance Rain Showers | 5 to 10 mph N | 23% |
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 Sep 19, 2026.