Saint Helens (OR) Weather and Climate: A Comprehensive Guide
The temperature in Saint Helens can vary greatly throughout the year.
The temperatures shift from warm
to cold.
It also has a notably wet climate with much precipitation.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
Depending on the time of the year, temperatures range from comfortable to chilly in Saint Helens. Average maximum daytime temperatures range from a comfortable 28°C in August, the warmest time of the year, to a chilly 7°C during cooler months like December.
At night, temperatures typically drop to an average of around 1°C during these months. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Saint Helens has a relatively rain/snowy climate with high precipitation levels, averaging 1096 mm of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, December receives heavy rainfall, averaging 198 mm of precipitation, recorded across 22 rainy days. In contrast, the drier season, July brings less rainfall, with 12 mm over 4 rainy days. For more details, please visit our Saint Helens Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in Saint Helens. 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
Average humidity
The relative humidity is high throughout the year in Saint Helens.
The city experiences its highest humidity in December, reaching 83%. In July, the humidity drops to its lowest level at 63%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
overcast and heavy rain broken clouds and rain partly cloudy and rainForecast for Saint Helens (OR)
2 m/s
2 m/s
2 m/s
The best time of year to visit Saint Helens in the United States of America
During the months of May, June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Most rainfall (rainy season) is seen in January, November and December.
Yes, the months of July and August are very dry.
August has an average maximum temperature of 28°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 7°C.
December tops the wettest month list with 198 mm of rainfall.
July is the driest month with 12 mm of precipitation.
July is the sunniest month with an average of 332 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
