Mertztown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mertztown, a community in Berks County, Pennsylvania.
Tonight
53°F
Mostly Clear
Mostly clear, with a low around 53. North wind 5 to 10 mph.
7-day forecast for Mertztown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Mostly Clear | 5 to 10 mph N | 0% |
| Saturday | 72°F | Mostly Sunny | 5 mph E | 2% |
| Saturday Night | 59°F | Chance Rain Showers | 5 mph SE | 51% |
| Sunday | 71°F | Rain Showers | 5 to 10 mph S | 92% |
| Sunday Night | 58°F | Patchy Fog | 5 to 10 mph W | 92% |
| Monday | 66°F | Chance Rain Showers | 10 mph NE | 35% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph NE | 37% |
| Tuesday Night | 50°F | Chance Rain Showers | 15 mph NE | 37% |
| Wednesday | 60°F | Chance Rain Showers | 15 mph NE | 35% |
| Wednesday Night | 49°F | Chance Showers And Thunderstorms | 15 mph NE | 40% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 37% |
| Thursday Night | 50°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 33% |
| Friday | 68°F | Slight Chance Rain Showers | 10 mph N | 21% |
Forecast source: National Weather Service (api.weather.gov) for Mertztown (40.502, -75.665). Updated through the day.
Growing snapshot for Mertztown
Last spring frost
Apr 26
First fall frost
Oct 14
Growing season
171 days
Hardiness zone
6b
More local growing data for Mertztown: nearby ZIP 19539 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Rodale Rsch Ctr, Pa (4.3 mi from Mertztown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.