Forest Grove Weather in September

September in Forest Grove averages 25°C (77°F) during the day and 10°C (50°F) at night. The perfect conditions and moderate rainfall make it a solid month to visit.

Rainfall in Forest Grove in September

On average, there are about 8 days with rain during this month, averaging 35 mm (1.4 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Forest Grove in September

September is one of the better months to visit Forest Grove. Expect 25°C (77°F) during the day and 10°C (50°F) at night. Experience the summer season in September. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Forest Grove in September

Expect a lot of sunshine this month, with about 236 hours of sun. These sunny conditions add to the overall experience.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Forest Grove.

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• January
• February
• March
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• May
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• August

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• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Forest Grove's climate page.

Forest Grove Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 27%  

Precipitation 35 mm (1.4 in)  

Rainy days 8 days  

Humidity 69% *  

Sunshine 236 hours *  

Percentage Sunshine *  

* Data from: Portland, the United States of America (40 KM, 25 Miles).

What to Wear in Forest Grove in September

For Forest Grove in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Some rain is possible, so pack something to handle light showers. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Forest Grove in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

10/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Forest Grove's climate page.

More climate data for Forest Grove

Temperature Rainfall Sunshine Humidity

See the full Forest Grove climate overview or explore weather in the United States of America.