Washington (PA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Washington.
Climate overview of Washington
The climate in Washington, Pennsylvania, United States of America, is marked by large temperature swings across the seasons, ranging from 28°C (82°F) in July to 2°C (36°F) in January.
Annual rain/snowfall is moderate at around 992 mm (39 in), with June being the wettest month. The city also has warm summers and cold winters. The most sunshine falls in July, with an average of 8.5 hours of daily sunshine.
Washington Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Washington - and find the best time to visit.
Monthly Temperature in Washington
In Washington, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a comfortable 28°C (82°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 2°C (36°F).
At night, temperatures range from around 16°C (61°F) in July to -8°C (18°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Washington
On average, Washington receives a reasonable amount of rain/snowfall, with an annual precipitation of 992 mm (39 in). Washington experiences moderate seasonal variation in rainfall, with monthly averages ranging from 114 mm (4.5 in) in June, the wettest month, and 59 mm (2.3 in) in February, the driest month. For more details, please visit our Washington Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Washington
Washington can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 8.5 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.4 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Washington by Month
The relative humidity is high throughout the year in Washington.
The city experiences its highest humidity in September, reaching 72%. In April, the humidity drops to its lowest level at 59%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Washington
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, July, August and September
- Warmest weather: July and August
- Most sunshine: June and July
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -8°C (18°F).
Frequently asked questions about the climate in Washington
What is the best time to visit Washington?
May, July, August and September typically offer the most optimal weather in Washington. In contrast, January, February, March and December tend to have less optimal conditions. Washington has warm summers and cold winters.
What temperatures can I expect in Washington?
Daytime highs range from 2°C (36°F) in January to 28°C (82°F) in July. Nighttime lows range from -8°C (18°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Washington get?
Annual rainfall is around 992 mm (39 in). June is the wettest month with 114 mm (4.5 in), while February is the driest with 59 mm (2.3 in).
How sunny is Washington?
Washington receives around 2,029 hours of sunshine per year. July is the sunniest month with 255 hours, while December is the cloudiest with just 73 hours. Overall, Washington enjoys abundant sunshine.
Washington 3-Day Forecast
Washington on the map
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