Sumner (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sumner.
Climate overview of Sumner
Temperatures in Sumner, Washington State, United States of America, vary greatly throughout the year. August is the hottest month at 25°C (77°F), while December is the coldest at 8°C (46°F).
Rain/snowfall is high, totalling around 1119 mm (44 in) per year. November is the wettest month and July the driest. The city also experiences a distinct dry season from July to August. The sunniest month is July, with 10.4 hours of sunshine per day on average.
Sumner Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sumner — and find the best time to visit.
Monthly Temperature in Sumner
The climate in Sumner is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a comfortable 25°C (77°F) in August, the warmest time of the year, to a chilly 8°C (46°F) during cooler months like December.
At night, you can expect temperatures ranging from 13°C (55°F) in August to around 1°C (34°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sumner
Sumner has a notably wet climate with abundant precipitation, recording 1119 mm (44 in) of rain/snowfall per year. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, November it receives heavy rainfall, averaging 176 mm (6.9 in) of precipitation, recorded across 21 rainy days. In contrast, the driest month July brings less rainfall, with 18 mm (0.7 in) over 6 rainy days. For more details, please visit our Sumner 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 Sumner
Seasonal changes in sunshine hours are quite dramatic in Sumner. While July receives considerable daily sunshine with up to 10.4 hours, November marks the darkest time of the year, where sunshine is scarce with only 2.0 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
Best Time to Visit Sumner
The wettest months are November, when precipitation is at its highest. Looking for inspiration on where to travel this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
Frequently asked questions about the climate in Sumner
What is the best time to visit Sumner?
June, July, August and September typically offer the most optimal weather in Sumner. In contrast, January, February, March, November and December tend to have less optimal conditions. Sumner has a distinct dry season from July to August.
What temperatures can I expect in Sumner?
Daytime highs range from 8°C (46°F) in December to 25°C (77°F) in August. Nighttime lows range from 1°C (34°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Sumner get?
Annual rainfall is around 1119 mm (44 in). November is the wettest month with 176 mm (6.9 in), while July is the driest with 18 mm (0.7 in).
How sunny is Sumner?
Sumner receives around 2,172 hours of sunshine per year. July is the sunniest month with 312 hours, while November is the cloudiest with just 60 hours. Overall, Sumner enjoys abundant sunshine.
Sumner 3-Day Forecast
Sumner (WA) 3-Day Forecast
Sumner on the map
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