West Middlesex, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Middlesex, a borough in Mercer County, Pennsylvania.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind 8 to 13 mph, with gusts as high as 23 mph.
7-day forecast for West Middlesex
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 8 to 13 mph S | 1% |
| Tonight | 55°F | Mostly Clear | 3 to 7 mph SE | 3% |
| Wednesday | 75°F | Partly Sunny then Chance Light Rain | 7 to 12 mph S | 36% |
| Wednesday Night | 59°F | Light Rain | 7 to 12 mph S | 100% |
| Thursday | 69°F | Mostly Sunny | 6 to 13 mph SW | 13% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 5 mph SW | 2% |
| Friday | 64°F | Partly Sunny then Slight Chance Light Rain | 0 to 6 mph W | 18% |
| Friday Night | 41°F | Chance Light Rain | 5 mph NW | 31% |
| Saturday | 55°F | Chance Light Rain | 5 to 10 mph W | 34% |
| Saturday Night | 34°F | Chance Light Rain then Mostly Cloudy | 2 to 7 mph W | 34% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 3 to 9 mph SW | 20% |
| Sunday Night | 32°F | Slight Chance Light Rain | 7 mph W | 20% |
| Monday | 57°F | Chance Light Rain | 7 to 12 mph W | 31% |
| Monday Night | 34°F | Chance Light Rain then Partly Cloudy | 8 mph SW | 31% |
Forecast source: National Weather Service (api.weather.gov) for West Middlesex (41.174, -80.456). Updated through the day.
Growing snapshot for West Middlesex
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
More local growing data for West Middlesex: nearby ZIP 16159 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Clark
Farrell
Fredonia
Greenville
Grove City
Hermitage
Jackson Center
Lake Latonka
Mercer
New Lebanon
Reynolds Heights
Sandy Lake
Sharon
Sharpsville
Sheakleyville
Stoneboro
Wheatland
Climate data from the nearest NOAA station, New Castle 1 N, Pa (11.1 mi from West Middlesex). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.