Saint Helens (OR) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Saint Helens.
Climate overview of Saint Helens
Saint Helens, Oregon, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 28°C (82°F) in August, while winters cool to 7°C (45°F) in December.
Rain/snowfall is high, totalling around 1096 mm (43 in) per year. December is the wettest month and July the driest. The city also experiences a distinct dry season from June to August. The sunniest month is July, with 11.1 hours of sunshine per day on average.
Saint Helens Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Saint Helens — and find the best time to visit.
Monthly Temperature in Saint Helens
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 (82°F) in August, the warmest time of the year, to a chilly 7°C (45°F) during cooler months like December.
At night, you can expect temperatures ranging from 13°C (55°F) in August to around 1°C (34°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Saint Helens
Saint Helens has a relatively rain/snowy climate with high precipitation levels, averaging 1096 mm (43 in) of rain/snowfall annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives heavy rainfall, averaging 198 mm (7.8 in) of precipitation, recorded across 22 rainy days. In contrast, the driest month July brings less rainfall, with 12 mm (0.5 in) 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 Hours in Saint Helens
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
Humidity in Saint Helens by Month
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%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Saint Helens
Rainfall during this time ranges from 12 mm (0.5 in) in July to 67 mm (2.6 in) in May. This means you can expect a mix of sunny days and occasional showers.
The rainy season falls during November and December, bringing heavy precipitation. 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 Saint Helens
What is the best time to visit Saint Helens?
May, June, July, August and September typically offer the most optimal weather in Saint Helens. In contrast, January, February, March, November and December tend to have less optimal conditions. Saint Helens has a distinct dry season from June to August.
What temperatures can I expect in Saint Helens?
Daytime highs range from 7°C (45°F) in December to 28°C (82°F) in August. Nighttime lows range from 1°C (34°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Saint Helens get?
Annual rainfall is around 1096 mm (43 in). December is the wettest month with 198 mm (7.8 in), while July is the driest with 12 mm (0.5 in).
How sunny is Saint Helens?
Saint Helens receives around 2,341 hours of sunshine per year. July is the sunniest month with 332 hours, while December is the cloudiest with just 64 hours. Overall, Saint Helens enjoys abundant sunshine.
Saint Helens 3-Day Forecast
Saint Helens (OR) 3-Day Forecast
Saint Helens on the map
Saint Helens is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.