When to go · Collinsville, Illinois
Collinsville, Illinois in August
Great month. Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
Key facts
- Verdict
- Great
- Temperature
- 32°C (90°F)90°F (32°C) / 70°C (158°F)158°F (70°C)
- average high / low
- Rain days
- 7
- Crowds
- High
- United States overall
- Prices
- High
- United States overall
Verdict
Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
Is another month better than August?
No other month rates higher than August for Collinsville, Illinois in this guide.
Weather in August
- Collinsville, IllinoisHighs around 32 °C (90 °F), lows around 70 °C (158 °F), rain on about 7 daysHighs around 90 °F (32 °C), lows around 158 °F (70 °C), rain on about 7 days
Crowds and prices
- Crowds · United States overall
- High
- Prices · United States overall
- High
United States overall: Hot and busy; wildfire smoke in the West, hurricane peak begins in the Southeast.
High-price month: see what to book ahead.
Compare two months
Weather, crowds and prices for any two months in Collinsville, Illinois, side by side.
Verdict
Aug: Great
May: Great
Daytime high
Aug: 32 °C (90 °F)90 °F (32 °C)
May: 20 °C (68 °F)68 °F (20 °C)
Night low
Aug: 70 °C (158 °F)158 °F (70 °C)
May: 55 °C (131 °F)131 °F (55 °C)
Rain days
Aug: 7
May: 5 (better)
Crowds
Aug: High
May: Medium
Prices
Aug: High
May: Medium
Festivals listed
Aug: 0
May: 1
August: Inside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).
May: 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
- Light, breathable clothes, a sun hat and sunscreen