Lewistown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lewistown, a borough in Mifflin County, Pennsylvania.
This Afternoon
74°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 74. Southeast wind around 1 mph. Chance of precipitation is 20%.
7-day forecast for Lewistown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Slight Chance Rain Showers | 1 mph SE | 15% |
| Tonight | 62°F | Rain Showers Likely | 3 mph E | 66% |
| Sunday | 78°F | Rain Showers | 5 mph SW | 98% |
| Sunday Night | 53°F | Showers And Thunderstorms Likely then Mostly Cloudy | 5 mph NW | 64% |
| Monday | 71°F | Partly Sunny then Chance Rain Showers | 5 mph NE | 29% |
| Monday Night | 52°F | Rain Showers Likely | 6 mph NE | 61% |
| Tuesday | 64°F | Rain Showers Likely | 6 mph E | 61% |
| Tuesday Night | 49°F | Chance Rain Showers | 5 to 8 mph E | 54% |
| Wednesday | 61°F | Chance Rain Showers | 8 mph E | 45% |
| Wednesday Night | 48°F | Chance Rain Showers | 7 mph E | 29% |
| Thursday | 63°F | Slight Chance Rain Showers | 3 to 7 mph NE | 19% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 3 mph NE | 23% |
| Friday | 68°F | Chance Rain Showers | 5 mph N | 25% |
| Friday Night | 48°F | Chance Rain Showers | 5 mph N | 25% |
Forecast source: National Weather Service (api.weather.gov) for Lewistown (40.597, -77.572). Updated through the day.
Growing snapshot for Lewistown
Last spring frost
Apr 21
First fall frost
Oct 24
Growing season
185 days
Hardiness zone
7a
More local growing data for Lewistown: nearby ZIP 17044 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Lewistown, Pa (1.1 mi from Lewistown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.