Mount Gretna, PA Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 1 to 5 mph E | 0% |
| Tonight | 67°F | Mostly Cloudy | 5 mph SE | 5% |
| Wednesday | 83°F | Showers And Thunderstorms Likely | 3 to 7 mph E | 70% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 7 mph SE | 62% |
| Thursday | 88°F | Partly Sunny then Showers And Thunderstorms Likely | 5 to 9 mph S | 70% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely | 2 to 8 mph S | 70% |
| Friday | 88°F | Mostly Sunny then Showers And Thunderstorms Likely | 2 to 7 mph SW | 68% |
| Friday Night | 70°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 68% |
| Saturday | 86°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph W | 51% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 51% |
| Sunday | 88°F | Mostly Sunny | 2 to 7 mph W | 13% |
| Sunday Night | 71°F | Partly Cloudy | 6 mph SW | 13% |
| Monday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 10 mph W | 20% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Gretna, PA
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
185 days
Hardiness zone
7a
Explore more for Mount Gretna, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Lebanon 2 W, Pa (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.