Yosemite National Park is definitely worth a visit
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Castle Rock (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castle Rock.
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Climate overview of Castle Rock
The climate in Castle Rock, Washington State, United States of America, is marked by large temperature swings across the seasons, ranging from 26°C (79°F) in August to 7°C (45°F) in December.
The city has a wet climate, receiving around 1336 mm (53 in) of rain/snowfall per year. Despite the high annual total, it has distinct dry (July to August) and wet (November to January) seasons, with warm summers and cold winters. January is the wettest month. The sunniest month is July, with 11.0 hours of sunshine per day on average.
Castle Rock Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castle Rock - and find the best time to visit.
Monthly Temperature in Castle Rock
In Castle Rock, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 26°C (79°F) in August to a chilly 7°C (45°F) in December.
Nighttime temperatures range from 12°C (54°F) in August to 1°C (34°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castle Rock
Castle Rock experiences significant rain/snowfall throughout the year, averaging 1336 mm (53 in) of precipitation annually. The seasons in Castle Rock bring significant changes in precipitation. The wettest month, January, receives heavy rainfall, with an average of 207 mm (8.1 in) of precipitation. This rainfall is distributed across 21 rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 12 mm (0.5 in) over 5 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Castle Rock 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 Castle Rock
In Castle Rock, summer days are longer and more sunny, with daily sunshine hours peaking at 11.0 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 2.1 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Astoria, the United States of America (71 KM, 44 Miles).
Daily hours of sunshine
Data from: Astoria, the United States of America (71 KM, 44 Miles).
Best Time to Visit Castle Rock
The most comfortable overall weather for exploring Castle Rock 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
very wet
Feb
wet
Mar
wet
Apr
good
May
very good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
mixed
Nov
very wet
Dec
very 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: Distinct dry (July to August) and wet (November to January) seasons, with warm summers and cold winters
Frequently asked questions about the climate in Castle Rock
What is the best time to visit Castle Rock?
June, July, August and September typically offer the most optimal weather in Castle Rock. In contrast, January, February, March, November and December tend to have less optimal conditions. Castle Rock has distinct dry (July to August) and wet (November to January) seasons, with warm summers and cold winters.
What temperatures can I expect in Castle Rock?
Daytime highs range from 7°C (45°F) in December to 26°C (79°F) in August. Nighttime lows range from 1°C (34°F) to 12°C (54°F). Temperatures vary considerably through the year.
How much rain does Castle Rock get?
Annual rainfall is around 1336 mm (53 in). January is the wettest month with 207 mm (8.1 in), while July is the driest with 12 mm (0.5 in).
How sunny is Castle Rock?
Castle Rock receives around 2,342 hours of sunshine per year. July is the sunniest month with 330 hours, while December is the cloudiest with just 62 hours. Overall, Castle Rock enjoys abundant sunshine.
Castle Rock 3-Day Forecast
Castle Rock on the map
Castle Rock is highlighted - select any city to see its climate.
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