When to go · Collinsville, Illinois
Collinsville, Illinois in May
Great month. Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
Key facts
- Verdict
- Great
- Temperature
- 20°C (68°F)68°F (20°C) / 55°C (131°F)131°F (55°C)
- average high / low
- Rain days
- 5
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
Is another month better than May?
No other month rates higher than May for Collinsville, Illinois in this guide.
Weather in May
- Collinsville, IllinoisHighs around 20 °C (68 °F), lows around 55 °C (131 °F), rain on about 5 daysHighs around 68 °F (20 °C), lows around 131 °F (55 °C), rain on about 5 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 Collinsville, Illinois, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 20 °C (68 °F)68 °F (20 °C)
Jun: 30 °C (86 °F)86 °F (30 °C)
Night low
May: 55 °C (131 °F)131 °F (55 °C)
Jun: 65 °C (149 °F)149 °F (65 °C)
Rain days
May: 5 (better)
Jun: 8
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
June: Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
Collinsville, Illinois: figures are long-term averages from this guide, not a forecast.
What to pack
Nothing unusual for the weather this month.