Mifflintown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mifflintown, a borough in Juniata County, Pennsylvania.
Tonight
63°F
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a low around 63. Northeast wind 0 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Mifflintown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Rain Showers Likely | 0 to 5 mph NE | 67% |
| Sunday | 78°F | Rain Showers | 5 mph SW | 97% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely then Mostly Cloudy | 1 to 5 mph NW | 62% |
| Monday | 70°F | Partly Sunny then Chance Rain Showers | 5 mph NE | 28% |
| Monday Night | 53°F | Rain Showers Likely | 6 mph NE | 60% |
| Tuesday | 63°F | Rain Showers Likely | 6 mph E | 60% |
| Tuesday Night | 50°F | Chance Rain Showers | 7 mph E | 53% |
| Wednesday | 60°F | Chance Rain Showers | 7 mph E | 44% |
| Wednesday Night | 49°F | Chance Rain Showers | 7 mph E | 30% |
| Thursday | 62°F | Slight Chance Rain Showers | 3 to 7 mph NE | 18% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 3 mph NE | 23% |
| Friday | 67°F | Chance Rain Showers | 5 mph N | 25% |
| Friday Night | 49°F | Chance Rain Showers | 3 mph N | 25% |
| Saturday | 70°F | Slight Chance Rain Showers | 5 mph N | 16% |
Forecast source: National Weather Service (api.weather.gov) for Mifflintown (40.571, -77.395). Updated through the day.
Growing snapshot for Mifflintown
Last spring frost
Apr 21
First fall frost
Oct 24
Growing season
185 days
Hardiness zone
7a
More local growing data for Mifflintown: nearby ZIP 17059 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lewistown, Pa (9.4 mi from Mifflintown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.