Fullerton, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fullerton, a community in Lehigh County, Pennsylvania.
This Afternoon
82°F
Mostly Sunny
Mostly sunny, with a high near 82. North wind around 10 mph.
7-day forecast for Fullerton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 82°F | Mostly Sunny | 10 mph N | 0% |
| Tonight | 54°F | Mostly Clear | 5 to 10 mph N | 0% |
| Saturday | 72°F | Mostly Sunny | 5 mph E | 1% |
| Saturday Night | 59°F | Rain Showers Likely | 5 mph SE | 55% |
| 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 | 52°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 62°F | Chance Rain Showers | 10 mph NE | 37% |
| Tuesday Night | 49°F | Chance Rain Showers | 10 mph NE | 35% |
| Wednesday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Wednesday Night | 49°F | Chance Showers And Thunderstorms | 10 mph NE | 39% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 10 mph NE | 36% |
| Thursday Night | 50°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 32% |
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
Nearby towns & communities
Alburtis
Allentown
Ancient Oaks
Bethlehem
Breinigsville
Catasauqua
Cementon
Cetronia
Coopersburg
Coplay
DeSales University
Dorneyville
Egypt
Emmaus
Fountain Hill
Hokendauqua
Laurys Station
Macungie
New Tripoli
North Catasauqua
Schnecksville
Slatedale
Slatington
Stiles
Trexlertown
Wescosville
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 Sep 18, 2026.