Castle Rock (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castle Rock.
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. 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
Daily hours of sunshine
Best Time to Visit Castle Rock
Be prepared for heavier rainfall during January, March, November and December, the wettest period of the year. 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 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.
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 (WA) 3-Day Forecast
Castle Rock on the map
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