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.
Sumner (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sumner.
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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, with warm summers and cold winters. 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
Data from: Tacoma, the United States of America (16 KM, 10 Miles).
Daily hours of sunshine
Data from: Tacoma, the United States of America (16 KM, 10 Miles).
Daily percentage of sunshine
Data from: Tacoma, the United States of America (16 KM, 10 Miles).
Best Time to Visit Sumner
The most comfortable overall weather for exploring Sumner is usually found in June, July, August and September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
wet
Feb
cold
Mar
wet
Apr
good
May
very good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
mixed
Nov
wet
Dec
wet
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: July and August
- Wettest months: January, February, March, October, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from July to August, with warm summers and cold winters
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, with warm summers and cold winters.
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 on the map
Sumner is highlighted - select any city to see its climate.
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