Decatur weather in July 2025

Expect 88°F daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Decatur in July. Check more long-term weather averages for Decatur in July before you book your next holiday to Illinois in 2025/2026.

  • 88°F maximum daytime temperature in July in Decatur88
    88°F max day temperature
  • 10 hours of sunshine per day
  • 9 days with some rainfall in July in Decatur9
    9 days with some rainfall
  • 64°F minimum night-time temperature in July in Decatur64
    64°F min night temperature
  • 15 hours of daylight per day in July in Decatur15
    15 hours of daylight per day
  • High heat & humidity in July in DecaturH
    High heat & humidity
  • 4.2 inches monthly rainfall in July in Decatur4.2
    4.2 inches of monthly rainfall
  • UV (maximum) index 9 (Very High) in July in Decatur9
    9 (Very High) UV index

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The July weather guide for Illinois (Decatur) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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How hot is it in Decatur in July?

Daytime temperatures usually reach 88°F in Decatur in July with high heat and humidity, falling to 64°F at night.

How sunny is it in Decatur in July?

There are normally 10 hours of bright sunshine each day in Decatur in July - that's 70% of daylight hours.

Does it rain in Decatur in July?

There are usually 9 days with some rain in Decatur in July and the average monthly rainfall is 4.2 inches.

Decatur July sunrise & sunset times

Browse the sunrise and sunset times for Decatur in July 2025. Select a month to view Decatur sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st July 2025 04:31 19:28
Wednesday, 16th July 2025 04:41 19:22
Thursday, 31st July 2025 04:54 19:10

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