Mifflinburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mifflinburg, a borough in Union County, Pennsylvania.
This Afternoon
71°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 71. Southeast wind around 2 mph. Chance of precipitation is 20%.
7-day forecast for Mifflinburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Slight Chance Rain Showers | 2 mph SE | 15% |
| Tonight | 61°F | Rain Showers | 1 to 7 mph SE | 90% |
| Sunday | 73°F | Rain Showers | 3 to 8 mph S | 99% |
| Sunday Night | 53°F | Showers And Thunderstorms Likely then Mostly Cloudy | 3 to 8 mph NW | 65% |
| Monday | 68°F | Partly Sunny then Slight Chance Rain Showers | 8 mph N | 19% |
| Monday Night | 51°F | Rain Showers Likely | 6 mph NE | 56% |
| Tuesday | 62°F | Rain Showers Likely | 6 mph NE | 56% |
| Tuesday Night | 48°F | Chance Rain Showers | 6 mph NE | 43% |
| Wednesday | 60°F | Chance Rain Showers | 7 mph E | 27% |
| Wednesday Night | 48°F | Slight Chance Rain Showers | 6 mph E | 18% |
| Thursday | 61°F | Slight Chance Rain Showers | 6 mph NE | 18% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 3 mph NE | 22% |
| Friday | 65°F | Chance Rain Showers | 3 to 8 mph N | 25% |
| Friday Night | 49°F | Slight Chance Rain Showers | 3 to 8 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov) for Mifflinburg (40.920, -77.047). Updated through the day.
Growing snapshot for Mifflinburg
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
175 days
Hardiness zone
6b
More local growing data for Mifflinburg: nearby ZIP 17844 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Laurelton Ctr, Pa (7.8 mi from Mifflinburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.