When to go · Grinnell
Grinnell in May
Great month. Inside Grinnell's best window: May–Oct (warm, low rain).
Key facts
- Verdict
- Great
- Temperature
- 78°C (172°F)172°F (78°C) / 56°C (133°F)133°F (56°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 May?
No other month rates higher than May for Grinnell in this guide.
Weather in May
- GrinnellHighs around 78 °C (172 °F), lows around 56 °C (133 °F), rain on about 0 daysHighs around 172 °F (78 °C), lows around 133 °F (56 °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.
Memorial Day big impact
Last Monday of May · United States
Start of summer; roads and beaches full.
Crowds and prices
- Crowds · United States overall
- Medium
- Prices · United States overall
- Medium
United States overall: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.
Compare two months
Weather, crowds and prices for any two months in Grinnell, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 78 °C (172 °F)172 °F (78 °C)
Jun: 86 °C (187 °F)187 °F (86 °C)
Night low
May: 56 °C (133 °F)133 °F (56 °C)
Jun: 64 °C (147 °F)147 °F (64 °C)
Rain days
May: 0
Jun: 0
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside Grinnell's best window: May–Oct (warm, low rain).
June: 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