Fullerton, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fullerton, a community in Lehigh County, Pennsylvania.
This Afternoon
69°F
Mostly Sunny
Mostly sunny, with a high near 69. Southwest wind 0 to 5 mph.
7-day forecast for Fullerton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Tonight | 46°F | Areas Of Fog | 0 mph | 2% |
| Wednesday | 73°F | Patchy Fog then Partly Sunny | 0 to 5 mph S | 2% |
| Wednesday Night | 56°F | Mostly Cloudy | 0 to 5 mph S | 14% |
| Thursday | 71°F | Light Rain | 5 mph S | 75% |
| Thursday Night | 58°F | Light Rain Likely | 0 to 5 mph SW | 70% |
| Friday | 70°F | Light Rain Likely | 0 mph | 70% |
| Friday Night | 49°F | Light Rain Likely | 0 mph | 65% |
| Saturday | 66°F | Slight Chance Light Rain | 0 to 5 mph NW | 20% |
| Saturday Night | 41°F | Slight Chance Light Rain | 0 to 5 mph NW | 18% |
| Sunday | 61°F | Mostly Sunny | 0 to 5 mph NW | 13% |
| Sunday Night | 38°F | Partly Cloudy then Chance Light Rain | 0 to 5 mph W | 25% |
| Monday | 58°F | Chance Light Rain | 5 to 10 mph NW | 34% |
| Monday Night | 38°F | Chance Light Rain | 5 mph W | 34% |
Forecast source: National Weather Service (api.weather.gov) for Fullerton (40.631, -75.480). Updated through the day.
Growing snapshot for Fullerton
Last spring frost
Apr 20
First fall frost
Oct 24
Growing season
184 days
Hardiness zone
7a
More local growing data for Fullerton: nearby ZIP 18102 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Allentown Intl Ap, Pa (3.3 mi from Fullerton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.