Historical weather data, all-time temperature records, and monthly climate averages for Washington, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Washington, PA is a classic shoulder-season wildcard — averaging a mild 61° high, but with a 71-degree range in the historical record. Temperatures have swung from a bitter 14° in 2013 to a shirt-sleeve 85° in 2010, all on this same date. There's nearly a 60% chance of rain, so don't leave the umbrella behind.
Washington, PA earns its place in western Pennsylvania's reputation for weather extremes — the thermometer has ranged a jaw-dropping 127 degrees between its all-time records. The mercury hit 102° in July 1988 and crashed to -25° in January 1963, while a single February storm in 2003 dumped 18.8 inches of snow in one day.
Summer is the sweet spot here, with highs peaking around 84-85° in mid-to-late July and the wettest stretch of the year arriving right on summer's heels. If you're avoiding the cold, steer clear of mid-January, when average highs scrape just 36°. Spring and fall offer comfortable temperatures in the 50s-60s, though rain is a near-constant companion.