CWS Forecast: Washington, PA

After a dry Saturday, this week will bring wet conditions to the Commonwealth. Saturday will bring high cloud cover, and cold dry air coming from the north, with rain beginning overnight. Sunday is expected to have steady rain across the state with possible thunderstorms overnight. Some model guidance points to continued rain on Monday throughout Southern Pennsylvania as well. Even more steady rain is expected on Tuesday and Wednesday with below average temperatures.

Today: Sunday, September 20th, 2026

Tonight: Sunday, September 20th, 2026

Tomorrow: Monday, September 21st, 2026

High: 75°F

Low: 60°F

High: 73°F

Warm and a bit humid with mostly cloudy conditions, clearing up in the afternoon.

Partly cloudy skies.

Partly cloudy throughout the day with a bit less humidity.

Day Two: Monday, September 21st, 2026

Mostly cloudy with rain and a possibility for thunder showers during the day. Overnight, skies are mostly cloudy.

High: 76°F 

Low: 66°F 

Day Three: Tuesday, September 22nd, 2026

Warm and humid with daytime rain and overnight mostly cloudy skies.

High: 75°F

Low: 62°F

Day Four: Wednesday, September 23rd, 2026

Mostly cloudy and mild with rain returning overnight.

High: 70°F

Low: 60°F

Day Five: Thursday, September 24th, 2026

Cooler with rain, clouds, and mist. Breezy winds are also expected.

High: 65°F

Low: 58°F

Last Updated on September 18, 2026 at 4:24 pm