Mertztown, PA Weather & Growing Conditions
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Northeast wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 64°F | Mostly Cloudy | 0 mph | 3% |
| Wednesday | 82°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph E | 60% |
| Wednesday Night | 70°F | Showers And Thunderstorms Likely | 0 to 5 mph SE | 55% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 0 to 10 mph S | 69% |
| Thursday Night | 71°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 69% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 52% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 52% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 41% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 41% |
| Sunday | 86°F | Mostly Sunny | 0 to 5 mph W | 11% |
| Sunday Night | 70°F | Mostly Clear | 0 to 5 mph SW | 11% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph W | 15% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 5 mph W | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mertztown, PA
Last spring frost
Apr 26
First fall frost
Oct 14
Growing season
171 days
Hardiness zone
6b
Explore more for Mertztown, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Rodale Rsch Ctr, Pa (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.