Joliet weather in July: Joliet, Illinois: normal highs, lows, rain and records for July
Joliet in July has a normal high of 84°F and a normal low of 64°F, a daily mean of 74°F, holding near 84°F all month. Measurable precipitation falls on 9 days in a normal July, 4.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 18°C, 116 mm of precipitation in July.
- NOAA stationJoliet Brandon Rd Dam
- Station IDUSC00114530
- Location41.50°N 88.10°W
- Elevation543 ft (166 m)
- Population151,837
- Jan 31° 17°
- Feb 35° 20°
- Mar 47° 29°
- Apr 60° 39°
- May 71° 49°
- Jun 80° 60°
- Jul 84° 64°
- Aug 82° 63°
- Sep 76° 55°
- Oct 63° 43°
- Nov 49° 32°
- Dec 36° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Joliet in July?
The normal high is 84°F and the normal low 64°F, for a daily mean of 73.9°F. July is 3.8°F warmer than June and 1.6°F warmer than August. July is the warmest month of the year in Joliet and the wettest. From one year to the next July's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Julys in three average between 71°F and 77°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 83°F | 64°F | 31% | 21% |
| July 8 | 84°F | 64°F | 30% | 21% |
| July 15 | 84°F | 64°F | 30% | 21% |
| July 22 | 84°F | 64°F | 30% | 21% |
| July 31 | 83°F | 64°F | 30% | 21% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 8, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 83°F | 64°F | 31% | 21% | 15 h 10 min |
| July 2 | 84°F | 64°F | 31% | 21% | 15 h 10 min |
| July 3 | 84°F | 64°F | 31% | 21% | 15 h 10 min |
| July 4 | 84°F | 64°F | 31% | 21% | 15 h 10 min |
| July 5 | 84°F | 64°F | 31% | 21% | 15 h 10 min |
| July 6 | 84°F | 64°F | 31% | 21% | 15 h |
| July 7 | 84°F | 64°F | 30% | 21% | 15 h |
| July 8 | 84°F | 64°F | 30% | 21% | 15 h |
| July 9 | 84°F | 64°F | 30% | 21% | 15 h |
| July 10 | 84°F | 64°F | 30% | 21% | 15 h |
| July 11 | 84°F | 64°F | 30% | 21% | 15 h |
| July 12 | 84°F | 64°F | 30% | 21% | 15 h |
| July 13 | 84°F | 64°F | 30% | 21% | 15 h |
| July 14 | 84°F | 64°F | 30% | 21% | 15 h |
| July 15 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 16 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 17 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 18 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 19 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 20 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 21 | 84°F | 64°F | 30% | 21% | 14 h 50 min |
| July 22 | 84°F | 64°F | 30% | 21% | 14 h 40 min |
| July 23 | 84°F | 64°F | 30% | 21% | 14 h 40 min |
| July 24 | 83°F | 64°F | 30% | 21% | 14 h 40 min |
| July 25 | 83°F | 64°F | 30% | 21% | 14 h 40 min |
| July 26 | 83°F | 64°F | 30% | 21% | 14 h 40 min |
| July 27 | 83°F | 64°F | 30% | 21% | 14 h 40 min |
| July 28 | 83°F | 64°F | 30% | 21% | 14 h 30 min |
| July 29 | 83°F | 64°F | 30% | 21% | 14 h 30 min |
| July 30 | 83°F | 64°F | 30% | 21% | 14 h 30 min |
| July 31 | 83°F | 64°F | 30% | 21% | 14 h 30 min |
- Normal high
- 84°FJuly average
- Normal low
- 64°FJuly average
- Precipitation
- 4.55 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 15 h 10 min to 14 h 30 minJuly 1 to July 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 24
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00114530; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Joliet in July?
On a given July day the chance of 0.01 inch or more is 30% on average, highest around July 1 (31%). In all, 4.55 in falls on 9 days of a normal July, 1 of them with an inch or more.
In a normal July in Joliet, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00114530.
What are the records for July in Joliet?
The warmest July temperature on this station's record (since 1975) is 103°F, on July 14, 1995; the coldest is 47°F, on July 6, 1983. The wettest July brought 17.37 in (1996).
The July mean against the 1991-2020 normal of 73.9°F: 2021 73.3°F (−0.6), 2022 73.7°F (−0.2), 2023 72.9°F (−1.0), 2024 71.3°F (−2.6), 2025 77.0°F (+3.0), 2026 75.9°F (+2.0). 2 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 73.3°F | −0.6°F | 3.32 in |
| 2022 | 73.7°F | −0.2°F | 4.77 in |
| 2023 | 72.9°F | −1.0°F | 6.25 in |
| 2024 | 71.3°F | −2.6°F | 4.23 in |
| 2025 | 77.0°F | +3.0°F | 4.87 in |
| 2026 | 75.9°F | +2.0°F | 5.07 in |
Source: records: ACIS, station USC00114530; recent months: ACIS, station USC00114530. Records and recent months use complete months only.
How does July in Joliet compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, July normal highs run from 81°F in Barrington to 90°F in Belleville; Joliet's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.