Joliet, IL weather in July
Expect warm, often humid weather with some rain in Joliet in July, with highs near 84°F and lows near 64°F. Rain falls on about 9 days. It is one of the warmest months in Joliet.
- Normal high
- 84°F
- Normal low
- 64°F
- Wet days
- 9
- 4.5 in total
- Muggy days
- 12
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 83°F | 83°F |
| Normal low | 64°F | 64°F |
| Chance of a wet day | 31% | 30% |
| Sunrise / sunset | 5:22 am / 8:30 pm | 5:46 am / 8:11 pm |
| Daylight | 15.1 h | 14.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical July day
- 6 am71°Fdew point 63°F
- 9 am77°Fdew point 63°F
- Noon82°Fdew point 62°F
- 3 pm83°Fdew point 62°F
- 6 pm80°Fdew point 61°F
- 9 pm75°Fdew point 62°F
NOAA hourly normals (local standard time) from Chicago Midway Airport (25 mi away); average wind 9 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F6 of 31
- Hot dayshigh 90°F or more6 of 31
- Muggy daysdaily mean dew point 65°F or more12 of 31
- Wet daysat least 0.01 in of rain or melted snow9 of 31
- Notable rainat least 0.10 in6 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 4.5 in; a dry July brings about 2.4 in and a wet one about 5.3 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How July varies from year to year
- Warmest July, 1991-20202012: average high 91°F
- Coolest July2014: average high 78°F
- Wettest July1996: 17.4 in
- Driest July1991: 0.1 in
- Highest reading103°F (July 14, 1995)
- Lowest reading48°F (July 21, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 80°F | 84°F | 82°F |
| Normal low | 60°F | 64°F | 63°F |
| Wet days | 11 | 9 | 9 |
| Comfortable days | 10 | 6 | 7 |
| Daylight | 15.1 h | 14.8 h | 13.8 h |
Highs change by +4°F from June and -2°F into August.
Nearby alternatives in July
- Warmer: St. Louis, MO229 mi · high 90°F · 9 wet days
How Joliet ranks in July
- Normal high262nd warmest of 378 cities; 8th of 8 in Illinois
- Wet days186th driest of 378
- Comfortable days102nd most of 340
What to pack for Joliet in July
- A rain jacket or umbrella – rain on about 9 days
- Sunglasses and sunscreen – about 14.8 hours of daylight and highs near 84°F
Heating and cooling
July has 3 heating degree days and 278 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Joliet in July?
The normal high is 84°F and the normal low is 64°F. From 1991 to 2020 the hottest July reading was 103°F (July 14, 1995).
Does it rain a lot in Joliet in July?
About 9 days in July have at least 0.01 in of precipitation, and the normal total is 4.6 in. The wettest July in 1991-2020 was in 1996 (17.4 in); the driest was in 1991 (0.1 in).
Is July a good time to visit Joliet?
July ranks 7th of 12 months on our comfort score for Joliet (58 out of 100). It has about 6 comfortable days and about 6 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Joliet Brandon Rd Dam (USC00114530), 1.9 mi SW of the city center, 543 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Chicago Midway Airport (USW00014819), 25 mi NE of the city center, 612 ft (71 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Chicago Midway Intl Arpt (725340-14819), 25 mi NE of the city center, 610 ft (69 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).