Marietta, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marietta, a borough in Lancaster County, Pennsylvania.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Northeast wind 1 to 5 mph.
7-day forecast for Marietta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 1 to 5 mph NE | 0% |
| Tonight | 67°F | Mostly Cloudy then Patchy Fog | 1 to 5 mph SE | 6% |
| Wednesday | 85°F | Showers And Thunderstorms Likely | 2 to 6 mph E | 69% |
| Wednesday Night | 71°F | Showers And Thunderstorms Likely | 2 to 7 mph SE | 69% |
| Thursday | 90°F | Partly Sunny then Showers And Thunderstorms Likely | 3 to 9 mph S | 64% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely | 2 to 8 mph S | 64% |
| Friday | 90°F | Mostly Sunny then Showers And Thunderstorms Likely | 2 to 6 mph SW | 64% |
| Friday Night | 71°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph SW | 64% |
| Saturday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph W | 50% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 50% |
| Sunday | 89°F | Mostly Sunny | 2 to 6 mph W | 14% |
| Sunday Night | 71°F | Partly Cloudy | 2 to 6 mph SW | 14% |
| Monday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph W | 20% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 8 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov) for Marietta (40.057, -76.552). Updated through the day.
Growing snapshot for Marietta
Last spring frost
Apr 30
First fall frost
Oct 10
Growing season
162 days
Hardiness zone
7a
More local growing data for Marietta: nearby ZIP 17547 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Landisville 2 Nw, Pa (9 mi from Marietta). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.