Gresham (OR) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Gresham.
Climate overview of Gresham
Gresham, Oregon, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in August, while winters cool to 7°C (45°F) in December.
With around 1369 mm (54 in) of annual rain/snowfall, Gresham has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has distinct dry (July to August) and wet (November to January) seasons. The wettest month is December. Sunshine peaks in July, when the city sees around 11.1 hours of sunshine per day.
Gresham Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gresham — and find the best time to visit.
Monthly Temperature in Gresham
Depending on the time of the year, temperatures range from comfortable to chilly in Gresham. Average daytime temperatures reach a comfortable 27°C (81°F) in August. In December, the coolest month of the year, temperatures drop to a chilly 7°C (45°F).
At night, temperatures range from around 13°C (55°F) in August to 2°C (36°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Gresham
Gresham has a relatively rain/snowy climate with high precipitation levels, averaging 1369 mm (54 in) of rain/snowfall annually. Gresham can be quite wet during December, receiving approximately 219 mm (8.6 in) of precipitation over 23 rainy days.
In contrast, during the driest month (August), you will experience much drier conditions, with 14 mm (0.6 in) of precipitation spread across 5 rainy days days. For more details, please visit our Gresham 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 Gresham
Gresham can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 11.1 hours of sunshine daily. In contrast, the city experiences much darker days in December, 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 Gresham by Month
The relative humidity is high throughout the year in Gresham.
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
Wind Speed in Gresham
The mean wind speed varies between 2 m/s (4 knots) and 4 m/s (8 knots) throughout the year. It is lowest in September and October and highest during January. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Gresham
Rainfall during this time ranges from 14 mm (0.6 in) in August to 89 mm (3.5 in) in May. This means you can expect a mix of sunny days and occasional showers.
The rainy season falls during January, March, November and December, bringing heavy precipitation. Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.
Frequently asked questions about the climate in Gresham
What is the best time to visit Gresham?
May, June, July, August and September typically offer the most optimal weather in Gresham. In contrast, January, February, March, November and December tend to have less optimal conditions. Gresham has distinct dry (July to August) and wet (November to January) seasons.
What temperatures can I expect in Gresham?
Daytime highs range from 7°C (45°F) in December to 27°C (81°F) in August. Nighttime lows range from 2°C (36°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Gresham get?
Annual rainfall is around 1369 mm (54 in). December is the wettest month with 219 mm (8.6 in), while August is the driest with 14 mm (0.6 in).
How sunny is Gresham?
Gresham 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, Gresham enjoys abundant sunshine.
Gresham 3-Day Forecast
Gresham (OR) 3-Day Forecast
Gresham on the map
Gresham 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.