When to go · Waterloo, Iowa
Waterloo, Iowa in September
Great month. Inside Waterloo, Iowa's best window: May–Oct.
Key facts
- Verdict
- Great
- Temperature
- 78°C (172°F)172°F (78°C) / 58°C (136°F)136°F (58°C)
- average high / low
- Rain days
- 5
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Waterloo, Iowa's best window: May–Oct.
Is another month better than September?
No other month rates higher than September for Waterloo, Iowa in this guide.
Weather in September
- Waterloo, IowaHighs around 78 °C (172 °F), lows around 58 °C (136 °F), rain on about 5 daysHighs around 172 °F (78 °C), lows around 136 °F (58 °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.
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.
Compare two months
Weather, crowds and prices for any two months in Waterloo, Iowa, side by side.
Verdict
Sep: Great
May: Great
Daytime high
Sep: 78 °C (172 °F)172 °F (78 °C)
May: 71 °C (160 °F)160 °F (71 °C)
Night low
Sep: 58 °C (136 °F)136 °F (58 °C)
May: 50 °C (122 °F)122 °F (50 °C)
Rain days
Sep: 5
May: 4 (better)
Crowds
Sep: Medium
May: Medium
Prices
Sep: Medium
May: Medium
Festivals listed
Sep: 1
May: 1
September: Inside Waterloo, Iowa's best window: May–Oct.
May: Inside Waterloo, Iowa's best window: May–Oct.
Waterloo, Iowa: figures are long-term averages from this guide, not a forecast.
What to pack
- Light, breathable clothes, a sun hat and sunscreen