Mercer, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercer, a borough in Mercer County, Pennsylvania.
Overnight
52°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 52. East wind around 2 mph.
7-day forecast for Mercer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Patchy Fog | 2 mph E | 0% |
| Tuesday | 84°F | Patchy Fog then Sunny | 3 mph E | 0% |
| Tuesday Night | 63°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 86°F | Partly Sunny then Scattered Showers And Thunderstorms | 6 mph S | 47% |
| Wednesday Night | 66°F | Scattered Showers And Thunderstorms | 5 mph S | 50% |
| Thursday | 86°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 8 mph SW | 53% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 6 mph S | 57% |
| Friday | 83°F | Showers And Thunderstorms | 3 to 7 mph SW | 81% |
| Friday Night | 65°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 81% |
| Saturday | 84°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 8 mph SW | 37% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 37% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 9 mph SW | 22% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 8 mph SW | 30% |
| Monday | 86°F | Chance Rain Showers | 6 to 10 mph W | 44% |
Forecast source: National Weather Service (api.weather.gov) for Mercer (41.227, -80.236). Updated through the day.
Growing snapshot for Mercer
Last spring frost
May 15
First fall frost
Oct 3
Growing season
140 days
Hardiness zone
6a
More local growing data for Mercer: nearby ZIP 16137 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Clark
Farrell
Fredonia
Greenville
Grove City
Hermitage
Jackson Center
Lake Latonka
New Lebanon
Reynolds Heights
Sandy Lake
Sharon
Sharpsville
Sheakleyville
Stoneboro
West Middlesex
Wheatland
Climate data from the nearest NOAA station, Mercer, Pa (0.5 mi from Mercer). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.