Climate Overview
The climate in Cascade Locks is cool. The average annual temperature is 9°C and approximately 1658mm of precipitation falls per year. Dicembre is the wettest month, receiving around 280mm of rainfall. Cascade Locks is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Agosto, Luglio, Giugno. The coldest months are Dicembre, Febbraio, Gennaio, when temperatures can drop to -2°C. Cascade Locks experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Cascade Locks vary considerably across the year, with a 29°C difference between the coldest and warmest months. The warmest month is Agosto, when average highs reach 27°C and the mean temperature sits around 19°C. The coldest month is Dicembre, when overnight lows fall to -2°C and the daily average is 1°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.
Precipitation
Cascade Locks is a fairly wet location, receiving approximately 1658mm of precipitation annually, which averages out to around 138mm per month. The wettest month is December, averaging 280mm of rainfall. January and November also tend to see above-average precipitation. The driest month is July, with just 11mm. That's 269mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Cascade Locks receives heavy snowfall, accumulating around 330cm annually from January through December. The snowiest month is February, with approximately 79cm. Winter travel should account for significant snow cover.
Wind
Cascade Locks is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
92 days until Summer
It is currently spring in Cascade Locks, which began on March 20, 2026. Cascade Locks is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in Agosto at around 27°C, while the coldest stretch bottoms out in Dicembre near -2°C. Summer is next, beginning on June 21, 2026 — 92 days from now.
Spring
Temperatures range from 0 to 18°C. Rainfall is heavy, totalling around 394mm across the season with a monthly average of 131mm. Winds are generally light, averaging 13km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 9 to 27°C. Rainfall is relatively light, with around 92mm over the season and a monthly average of 31mm. Winds are generally light, averaging 14km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 1 to 22°C. Rainfall is heavy, totalling around 424mm across the season with a monthly average of 141mm. Expect around 32cm of snow accumulation during this period. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -2 to 5°C. Rainfall is heavy, totalling around 747mm across the season with a monthly average of 249mm. Expect around 220cm of snow accumulation during this period. Winds are generally light, averaging 12km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Cascade Locks is during Luglio and Agosto, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 13mm per month. By contrast, Dicembre can be quite cold with temperatures dropping to -2°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Cascade Locks based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.