When to go · Decatur, Illinois
Decatur, Illinois in August
Great month. Inside Decatur, Illinois's best window: May–Oct.
Key facts
- Verdict
- Great
- Temperature
- 31°C (88°F)88°F (31°C) / 21°C (70°F)70°F (21°C)
- average high / low
- Rain days
- 8
- Crowds
- High
- United States overall
- Prices
- High
- United States overall
Verdict
Inside Decatur, Illinois's best window: May–Oct.
Is another month better than August?
No other month rates higher than August for Decatur, Illinois in this guide.
Weather in August
- Decatur, IllinoisHighs around 31 °C (88 °F), lows around 21 °C (70 °F), rain on about 8 daysHighs around 88 °F (31 °C), lows around 70 °F (21 °C), rain on about 8 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 Decatur, Illinois, side by side.
Verdict
Aug: Great
May: Great
Daytime high
Aug: 31 °C (88 °F)88 °F (31 °C)
May: 24 °C (75 °F)75 °F (24 °C)
Night low
Aug: 21 °C (70 °F)70 °F (21 °C)
May: 12 °C (54 °F)54 °F (12 °C)
Rain days
Aug: 8
May: 7 (better)
Crowds
Aug: High
May: Medium
Prices
Aug: High
May: Medium
Festivals listed
Aug: 0
May: 1
August: Inside Decatur, Illinois's best window: May–Oct.
May: Inside Decatur, Illinois's best window: May–Oct.
Decatur, Illinois: figures are long-term averages from this guide, not a forecast.
What to pack
- Light, breathable clothes, a sun hat and sunscreen