Grinnell Weather in August

Thinking of visiting Grinnell in August? Expect high temperatures reaching 28°C (82°F) during the day, dropping to 16°C (61°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Grinnell in August

You can typically expect 11 days of rain this month, averaging around 125 mm (4.9 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Grinnell in August

Expect highs of 28°C (82°F) in Grinnell in August, with nights dropping to around 16°C (61°F). August is in the summer season. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With lows of 16°C (61°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

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