The climate in Forest Grove during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Forest Grove and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 23°C (73°F), whilst at night 9°C (47°F) is normal.
Daytime temperature | 22.8°C 73°F |
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Nightly temperature | 8.5°C 47.2°F |
Average temperature | 15.6°C 60.1°F |
Daily sunshine | 8.3 hrs |
Avg rainfall | 40 mm 1.6 ins |
Rainy days | 9 days |
Sea temperature | 14.6°C 58.3°F |
Humidity | 72% |
Windspeed | 11.5kph 7 mph |
On average September is the 4th driest month of the year in Forest Grove with around 40mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.3 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Forest Grove in September 2024.
Best places to visit in September
Hottest month: | August | 25.1°C 77.2°F |
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Driest month: | July | 14mm 0.6ins |
Sunniest month: | July | 11.1hrs |
Coldest month: | January | 7.3°C 45.1°F |
Wettest month: | December | 207mm 8.1ins |