What is the long range weather forecast for West Chester, PA?

The Old Farmer's Almanac provides a 60-day extended weather forecast for West Chester, PA. This includes temperature trends, precipitation predictions, and seasonal weather patterns based on our traditional forecasting methods combined with modern meteorological science.

How accurate is the Almanac long range weather forecast?

The Old Farmer's Almanac claims an 80% accuracy rate for its long range forecasts. Our forecasting method uses a secret formula that considers sunspot activity, tidal action, and other factors along with current meteorological conditions.

For daily wit & wisdom, get the Almanac newsletter.

Long-Range Weather Forecast for West Chester, PA

Location West Chester, PA

60-Day Weather Forecast

July 2026 Long Range Weather Forecast for Atlantic Corridor
Dates	Weather Conditions
Jul 1-14	Isolated t-storms, hot
Jul 15-18	Sunny north, t-storms south; cooler
Jul 19-26	T-storms, then sunny; warm
Jul 27-31	Scattered t-storms, warm
July	temperature 78° (1° above avg.) precipitation 3.5" (0.5" below avg.)

August 2026 Long Range Weather Forecast for Atlantic Corridor
Dates	Weather Conditions
Aug 1-14	Scattered t-storms, then sunny; warm
Aug 15-16	Sunny north, tropical storm threat south; warm north, cool south
Aug 17-20	Sunny, warm
Aug 21-31	Sunny north, isolated t-storms south; cooler
August	temperature 75° (avg.) precipitation 2" (2" below avg.)

Map showing Old Farmer's Almanac long range weather region number 2

12-Month Long-Range Weather Outlook

November 2025 to October 2026

Winter temperatures will be above normal, while precipitation and snowfall will be below normal. The coldest periods will occur in mid- to late December and early and late January. The snowiest periods will be in late December, early January, and late February. April and May will end up warmer and drier than usual. Summer will be hotter and drier than normal. The hottest periods will be in early June and early and mid-July. Watch for tropical storms in late June and mid-August. September and October temperatures and precipitation will be below normal.

See the complete 12-month weather forecast in The Old Farmer’s Almanac..

Weather Trend Graph

November 2025 to October 2026