Washington (MO) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Washington.
Climate overview of Washington
Temperatures in Washington, Missouri, United States of America, vary greatly throughout the year. July is the hottest month at 31°C (88°F), while January is the coldest at 5°C (41°F).
The city has a wet climate, receiving around 1141 mm (45 in) of rain/snowfall per year. Despite the high annual total, it has very warm summers and cold winters. May is the wettest month. July is the sunniest month, averaging 10.4 hours of sunshine per day.
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
The climate in Washington is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 5°C (41°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Washington
Washington has a notably wet climate with abundant precipitation, recording 1141 mm (45 in) of rain/snowfall per year. The seasons in Washington bring significant changes in precipitation. The wettest month, May, receives high rainfall, with an average of 126 mm (5 in) of precipitation. This rainfall is distributed across 15 rainy days.
In contrast, the driest month, January, experiences much less snow/rainfall, totaling 49 mm (1.9 in) over 6 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. 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
In Washington, summer days are longer and more sunny, with daily sunshine hours peaking at 10.4 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.3 hours per average 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 December, reaching 74%. In April, the humidity drops to its lowest level at 63%. 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: October
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: January, August and November
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Washington
What is the best time to visit Washington?
October typically offers the most optimal weather in Washington. In contrast, January, February and December tend to have less optimal conditions. Washington has very warm summers and cold winters.
What temperatures can I expect in Washington?
Daytime highs range from 5°C (41°F) in January to 31°C (88°F) in July. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Washington get?
Annual rainfall is around 1141 mm (45 in). May is the wettest month with 126 mm (5 in), while January is the driest with 49 mm (1.9 in).
How sunny is Washington?
Washington receives around 2,594 hours of sunshine per year. July is the sunniest month with 311 hours, while December is the cloudiest with just 128 hours. Overall, Washington enjoys abundant sunshine.
Washington 3-Day Forecast
Washington (MO) 3-Day Forecast
Washington on the map
Washington is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.