When to go · Monticello, Illinois
Monticello, Illinois in September
Great month. Inside Monticello, Illinois's best window: May–Oct (park and train season); late Sep–Oct for foliage.
Key facts
- Verdict
- Great
- Temperature
- 26°C79°F / 14°C57°F
- average high / low
- Rain days
- 8
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
GreatBest and avoid months for Monticello, Illinois
Inside Monticello, Illinois's best window: May–Oct (park and train season); late Sep–Oct for foliage.
Weather in September
- Monticello, IllinoisHighs around 26 °C, lows around 14 °C, rain on about 8 daysHighs around 79 °F, lows around 57 °F, rain on about 8 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.
What to pack
Nothing unusual for the weather this month.