Mifflinburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mifflinburg, a borough in Union County, Pennsylvania.
Overnight
55°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 55. Northwest wind around 1 mph.
7-day forecast for Mifflinburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Patchy Fog | 1 mph NW | 0% |
| Tuesday | 82°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Tuesday Night | 63°F | Mostly Cloudy | 1 mph NE | 3% |
| Wednesday | 81°F | Slight Chance Rain Showers then Partly Sunny | 0 to 3 mph E | 19% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 0 to 3 mph E | 50% |
| Thursday | 86°F | Patchy Fog then Showers And Thunderstorms | 0 to 6 mph SW | 81% |
| Thursday Night | 69°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 mph SW | 81% |
| Friday | 85°F | Showers And Thunderstorms | 0 to 5 mph SW | 75% |
| Friday Night | 68°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 mph W | 75% |
| Saturday | 84°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph NW | 45% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 to 3 mph W | 45% |
| Sunday | 86°F | Mostly Sunny | 0 to 5 mph W | 11% |
| Sunday Night | 69°F | Partly Cloudy | 3 mph SW | 11% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 8 mph W | 23% |
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 Aug 4, 2026.