Cascade Locks (OR) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to chilly in Cascade Locks. Average maximum daytime temperatures range from a comfortable 26°C (79°F) in August, the warmest time of the year, to a chilly 5°C (41°F) during cooler months like December.

At night, you can expect temperatures ranging from 13°C (55°F) in August to around -1°C (30°F) during December.

Check out our detailed temperature page for more information.

Temperature ranges by month

Cascade Locks has a relatively rain/snowy climate with high precipitation levels, averaging 2235 mm (88 in) of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives heavy snow/rainfall, averaging 388 mm (15 in) of precipitation, recorded across 24 snowy/rainy days. In contrast, the driest month July brings less rainfall, with 19 mm (0.7 in) over 4 rainy days. For more details, please visit our Cascade Locks Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Cascade Locks. While July receives considerable daily sunshine with up to 11.1 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.1 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Cascade Locks.

The city experiences its highest humidity in December, reaching 83%. In July, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year