Mertztown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mertztown, a community in Berks County, Pennsylvania.
This Afternoon
69°F
Mostly Sunny
Mostly sunny, with a high near 69. South wind around 5 mph.
7-day forecast for Mertztown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Mostly Sunny | 5 mph S | 2% |
| Tonight | 48°F | Partly Cloudy then Areas Of Fog | 0 to 5 mph S | 2% |
| Wednesday | 73°F | Areas Of Fog then Partly Sunny | 0 to 10 mph S | 2% |
| Wednesday Night | 57°F | Mostly Cloudy then Slight Chance Light Rain | 5 mph S | 15% |
| Thursday | 71°F | Light Rain Likely | 5 to 10 mph S | 73% |
| Thursday Night | 60°F | Light Rain Likely | 0 to 5 mph SW | 72% |
| Friday | 69°F | Light Rain Likely | 0 to 5 mph W | 72% |
| Friday Night | 51°F | Light Rain Likely | 0 to 5 mph NW | 63% |
| Saturday | 65°F | Slight Chance Light Rain | 0 to 5 mph NW | 19% |
| Saturday Night | 43°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 19% |
| Sunday | 61°F | Mostly Sunny | 5 mph NW | 14% |
| Sunday Night | 41°F | Partly Cloudy then Chance Light Rain | 0 to 5 mph W | 26% |
| Monday | 58°F | Chance Light Rain | 5 to 10 mph NW | 33% |
| Monday Night | 39°F | Chance Light Rain | 5 to 10 mph W | 33% |
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 Nov 3, 2026.