When to go · Grinnell
Grinnell in September
Great month. Inside Grinnell's best window: May–Oct (warm, low rain).
Key facts
- Verdict
- Great
- Temperature
- 84°C (183°F)183°F (84°C) / 64°C (147°F)147°F (64°C)
- average high / low
- Rain days
- 0
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Grinnell's best window: May–Oct (warm, low rain).
Is another month better than September?
No other month rates higher than September for Grinnell in this guide.
Weather in September
- GrinnellHighs around 84 °C (183 °F), lows around 64 °C (147 °F), rain on about 0 daysHighs around 183 °F (84 °C), lows around 147 °F (64 °C), rain on about 0 days
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Labor Day big impact
1st Monday of September · United States
End of summer; last big road-trip weekend.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: After Labor Day the crowds drop and parks stay open; Florida and the Gulf are at hurricane peak.
Compare two months
Weather, crowds and prices for any two months in Grinnell, side by side.
Verdict
Sep: Great
May: Great
Daytime high
Sep: 84 °C (183 °F)183 °F (84 °C)
May: 78 °C (172 °F)172 °F (78 °C)
Night low
Sep: 64 °C (147 °F)147 °F (64 °C)
May: 56 °C (133 °F)133 °F (56 °C)
Rain days
Sep: 0
May: 0
Crowds
Sep: Medium
May: Medium
Prices
Sep: Medium
May: Medium
Festivals listed
Sep: 1
May: 1
September: Inside Grinnell's best window: May–Oct (warm, low rain).
May: Inside Grinnell's best window: May–Oct (warm, low rain).
Grinnell: figures are long-term averages from this guide, not a forecast.
What to pack
- Light, breathable clothes, a sun hat and sunscreen