Forest Grove (OR) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Forest Grove.
Climate overview of Forest Grove
Forest Grove, Oregon, United States of America, sees big temperature differences between seasons, with August peaking at 28°C (82°F) and December dropping to 7°C (45°F).
With around 1111 mm (44 in) of annual rain/snowfall, Forest Grove has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has a distinct dry season from June to September, with warm summers and cold winters. The wettest month is December. The most sunshine falls in July, with an average of 11.1 hours of daily sunshine.
Forest Grove Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Forest Grove - and find the best time to visit.
Monthly Temperature in Forest Grove
Visitors to Forest Grove can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 28°C (82°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 1°C (34°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Forest Grove
Forest Grove is known for its substantial rain/snowfall, with annual precipitation reaching 1111 mm (44 in). Forest Grove can be quite wet during December, receiving approximately 216 mm (8.5 in) of precipitation over 21 rainy days.
In contrast, during the driest month (July), you will experience much drier conditions, with 8 mm (0.3 in) of precipitation spread across 3 rainy days. For more details, please visit our Forest Grove 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 Forest Grove
Forest Grove 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 Forest Grove by Month
The relative humidity is high throughout the year in Forest Grove.
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 Forest Grove
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: July and August
- Wettest months: January, February, March, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from June to September, with warm summers and cold winters
Frequently asked questions about the climate in Forest Grove
What is the best time to visit Forest Grove?
May, June, July, August and September typically offer the most optimal weather in Forest Grove. In contrast, January, February, March, November and December tend to have less optimal conditions. Forest Grove has a distinct dry season from June to September, with warm summers and cold winters.
What temperatures can I expect in Forest Grove?
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 Forest Grove get?
Annual rainfall is around 1111 mm (44 in). December is the wettest month with 216 mm (8.5 in), while July is the driest with 8 mm (0.3 in).
How sunny is Forest Grove?
Forest Grove 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, Forest Grove enjoys abundant sunshine.
Forest Grove 3-Day Forecast
Forest Grove on the map
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