Grinnell Weather in September

With daytime temperatures of 24°C (75°F) and nighttime lows of 11°C (52°F), September in Grinnell brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 96 mm (3.8 in) falls on average.

Rainfall in Grinnell in September

Historically, the month has about 9 days of rain, averaging 96 mm (3.8 in) in total. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Grinnell in September

September tends to be one of the perfect months in Grinnell, with 24°C (75°F) in the afternoon and 11°C (52°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

If your ideal day consists of dry skies and pleasant temperatures, September typically offers the best circumstances for Grinnell.

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

Grinnell Temperature in September

Min Temperature 11°C (52°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 31%  

Precipitation 96 mm (3.8 in)  

Rainy days 9 days  

What to Wear in Grinnell in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes.

What To Do in Grinnell in September

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

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

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 Grinnell's climate page.

More climate data for Grinnell

Temperature Rainfall

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