Snoqualmie Pass (WA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Snoqualmie Pass.
Climate overview of Snoqualmie Pass
Snoqualmie Pass, in Washington State, experiences a warm-summer Mediterranean climate with moderate seasonal temperature variation due to its high elevation in the Cascade Mountains. The area has mild summers with temperatures reaching 20°C (68°F) in July and cold winters dropping to 1°C (34°F) in December, with the region receiving exceptionally high precipitation totaling around 2753 mm (108 in) annually. The area experiences a distinct rainy season from October to May, with November being the wettest month, while July offers the most sunshine with 10.4 hours daily on average.
This mountain pass attracts many tourists as one of Washington's premier ski destinations with multiple ski resorts and excellent winter sports facilities. Let's now guide you through the climate details for a complete overview on the best time to visit.
Snoqualmie Pass Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Snoqualmie Pass - and find the best time to visit.
Monthly Temperature in Snoqualmie Pass
Visitors to Snoqualmie Pass can expect significant temperature changes throughout the year. On average, daytime temperatures range from a pleasant 20°C (68°F) in July to a very cold 1°C (34°F) in December.
Nighttime temperatures range from 10°C (50°F) in July to -3°C (27°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Snoqualmie Pass
Snoqualmie Pass is known for its substantial rain/snowfall, with annual precipitation reaching 2753 mm (108 in). The seasons in Snoqualmie Pass bring significant changes in precipitation. The wettest month, November, receives heavy snow/rainfall, with an average of 434 mm (17 in) of precipitation. This snow/rainfall is distributed across 25 snowy/rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 27 mm (1.1 in) over 7 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Snoqualmie Pass 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 Snoqualmie Pass
In Snoqualmie Pass, 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 1.8 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 Snoqualmie Pass by Month
The relative humidity is high throughout the year in Snoqualmie Pass.
The city experiences its highest humidity in December, reaching 80%. In July, the humidity drops to its lowest level at 65%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Snoqualmie Pass
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July and August
- 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 rainy season from October to April, with pleasant summers and very cold winters
- Coldest conditions: December, with freezing nights around -3°C (27°F).
Frequently asked questions about the climate in Snoqualmie Pass
What is the best time to visit Snoqualmie Pass?
July and August typically offer the most optimal weather in Snoqualmie Pass. In contrast, January, February, March, April, May, October, November and December tend to have less optimal conditions. Snoqualmie Pass has a distinct rainy season from October to April, with pleasant summers and very cold winters.
What temperatures can I expect in Snoqualmie Pass?
Daytime highs range from 1°C (34°F) in December to 20°C (68°F) in July. Nighttime lows range from -3°C (27°F) to 10°C (50°F). Temperatures vary considerably through the year.
How much rain does Snoqualmie Pass get?
Annual rainfall is around 2753 mm (108 in). November is the wettest month with 434 mm (17 in), while July is the driest with 27 mm (1.1 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Snoqualmie Pass?
Snoqualmie Pass receives around 2,171 hours of sunshine per year. July is the sunniest month with 312 hours, while December is the cloudiest with just 54 hours. Overall, Snoqualmie Pass enjoys abundant sunshine.
Snoqualmie Pass 3-Day Forecast
Snoqualmie Pass (WA) 3-Day Forecast
Snoqualmie Pass on the map
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