When to go · Collinsville, Illinois
Collinsville, Illinois, month by month
The best months for Collinsville, Illinois: May, Jun, Jul, Aug, Sep, Oct. Months to avoid: Jan, Feb.
Month by month
- JanuaryAvoidListed as a month to avoid: Jan–Feb (cold, occasional snow).-6 °C (21 °F) / -18 °C (0 °F), 5 rain days21 °F (-6 °C) / 0 °F (-18 °C), 5 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Jan–Feb (cold, occasional snow).-6 °C (21 °F) / -18 °C (0 °F), 5 rain days21 °F (-6 °C) / 0 °F (-18 °C), 5 rain daysCrowds: Low · 1 festival or holiday
- MarchGoodOutside the best window (May–Oct (festivals, warm weather)). Across United States: Spring break fills Florida beaches and parks; the desert parks come into season.10 °C (50 °F) / 30 °C (86 °F), 6 rain days50 °F (10 °C) / 86 °F (30 °C), 6 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGoodOutside the best window (May–Oct (festivals, warm weather)). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.15 °C (59 °F) / 40 °C (104 °F), 5 rain days59 °F (15 °C) / 104 °F (40 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).20 °C (68 °F) / 55 °C (131 °F), 5 rain days68 °F (20 °C) / 131 °F (55 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- JuneGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).30 °C (86 °F) / 65 °C (149 °F), 8 rain days86 °F (30 °C) / 149 °F (65 °C), 8 rain daysCrowds: High
- JulyGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).32 °C (90 °F) / 70 °C (158 °F), 8 rain days90 °F (32 °C) / 158 °F (70 °C), 8 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).32 °C (90 °F) / 70 °C (158 °F), 7 rain days90 °F (32 °C) / 158 °F (70 °C), 7 rain daysCrowds: High
- SeptemberGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).27 °C (81 °F) / 60 °C (140 °F), 5 rain days81 °F (27 °C) / 140 °F (60 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGreatInside Collinsville, Illinois's best window: May–Oct (festivals, warm weather).20 °C (68 °F) / 45 °C (113 °F), 5 rain days68 °F (20 °C) / 113 °F (45 °C), 5 rain daysCrowds: Medium
- NovemberMixedOutside the best window (May–Oct (festivals, warm weather)). Across United States: Quiet between holidays; Thanksgiving week is the busiest travel period of the year.10 °C (50 °F) / 30 °C (86 °F), 5 rain days50 °F (10 °C) / 86 °F (30 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- DecemberMixedOutside the best window (May–Oct (festivals, warm weather)). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.-2 °C (28 °F) / 20 °C (68 °F), 5 rain days28 °F (-2 °C) / 68 °F (20 °C), 5 rain daysCrowds: High · 1 festival or holiday
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.