Carbondale weather in August: Carbondale, Illinois: normal highs, lows, rain and records for August
Carbondale in August has a normal high of 87°F and a normal low of 65°F, a daily mean of 76°F, falling from 88°F on the 1st to 85°F by the 31st. Measurable precipitation falls on 12 days in a normal August, 3.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 18°C, 77 mm of precipitation in August.
- NOAA stationCarbondale Southern Illinois Airport
- Station IDUSW00093810
- Location37.78°N 89.25°W
- Elevation406 ft (124 m)
- From the center4 miles
- Population22,223
- Jan 42° 25°
- Feb 47° 28°
- Mar 57° 36°
- Apr 68° 45°
- May 77° 55°
- Jun 86° 64°
- Jul 88° 68°
- Aug 87° 65°
- Sep 81° 56°
- Oct 70° 45°
- Nov 56° 35°
- Dec 46° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Carbondale in August?
The normal high is 87°F and the normal low 65°F, for a daily mean of 76.0°F. August is 2.0°F cooler than July and 7.7°F warmer than September. August is the 2nd warmest month of the year in Carbondale and the 9th wettest. Across the month the normal high falls 3°F, from 88°F on August 1 to 85°F on August 31. From one year to the next August's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 73°F and 79°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 88°F | 67°F | 40% | 19% |
| August 8 | 88°F | 66°F | 40% | 18% |
| August 15 | 88°F | 65°F | 39% | 18% |
| August 22 | 87°F | 64°F | 38% | 16% |
| August 31 | 85°F | 61°F | 37% | 15% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 88°F | 67°F | 40% | 19% | 14 h 10 min |
| August 2 | 88°F | 67°F | 40% | 19% | 14 h 10 min |
| August 3 | 88°F | 67°F | 40% | 19% | 14 h |
| August 4 | 88°F | 67°F | 40% | 19% | 14 h |
| August 5 | 88°F | 67°F | 40% | 19% | 14 h |
| August 6 | 88°F | 67°F | 40% | 19% | 14 h |
| August 7 | 88°F | 67°F | 40% | 19% | 14 h |
| August 8 | 88°F | 66°F | 40% | 18% | 13 h 50 min |
| August 9 | 88°F | 66°F | 39% | 18% | 13 h 50 min |
| August 10 | 88°F | 66°F | 39% | 18% | 13 h 50 min |
| August 11 | 88°F | 66°F | 39% | 18% | 13 h 50 min |
| August 12 | 88°F | 66°F | 39% | 18% | 13 h 50 min |
| August 13 | 88°F | 66°F | 39% | 18% | 13 h 40 min |
| August 14 | 88°F | 66°F | 39% | 18% | 13 h 40 min |
| August 15 | 88°F | 65°F | 39% | 18% | 13 h 40 min |
| August 16 | 88°F | 65°F | 39% | 18% | 13 h 40 min |
| August 17 | 87°F | 65°F | 39% | 18% | 13 h 40 min |
| August 18 | 87°F | 65°F | 38% | 17% | 13 h 30 min |
| August 19 | 87°F | 65°F | 38% | 17% | 13 h 30 min |
| August 20 | 87°F | 64°F | 38% | 17% | 13 h 30 min |
| August 21 | 87°F | 64°F | 38% | 17% | 13 h 30 min |
| August 22 | 87°F | 64°F | 38% | 16% | 13 h 20 min |
| August 23 | 87°F | 64°F | 38% | 16% | 13 h 20 min |
| August 24 | 86°F | 63°F | 38% | 16% | 13 h 20 min |
| August 25 | 86°F | 63°F | 37% | 16% | 13 h 20 min |
| August 26 | 86°F | 63°F | 37% | 16% | 13 h 20 min |
| August 27 | 86°F | 63°F | 37% | 16% | 13 h 10 min |
| August 28 | 86°F | 62°F | 37% | 15% | 13 h 10 min |
| August 29 | 86°F | 62°F | 37% | 15% | 13 h 10 min |
| August 30 | 85°F | 62°F | 37% | 15% | 13 h 10 min |
| August 31 | 85°F | 61°F | 37% | 15% | 13 h |
- Normal high
- 87°FAugust average
- Normal low
- 65°FAugust average
- Precipitation
- 3.05 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 14 h 10 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 29
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093810; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Carbondale in August?
On a given August day the chance of 0.01 inch or more is 39% on average, highest around August 1 (40%). In all, 3.05 in falls on 12 days of a normal August, 1 of them with an inch or more.
In a normal August in Carbondale, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093810.
What are the records for August in Carbondale?
The warmest August temperature on Carbondale's official record (since 1898) is 113°F, on August 9, 1930; the coldest is 41°F, on August 12, 1902. The wettest August brought 11.18 in (1932).
The August mean against the 1991-2020 normal of 76.0°F: 2021 77.3°F (+1.3), 2022 75.5°F (−0.5), 2023 76.5°F (+0.5), 2024 76.7°F (+0.7), 2025 75.1°F (−0.9), 2026 77.8°F (+1.8). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.3°F | +1.3°F | 2.04 in |
| 2022 | 75.5°F | −0.5°F | 2.61 in |
| 2023 | 76.5°F | +0.5°F | 5.63 in |
| 2024 | 76.7°F | +0.7°F | 0.69 in |
| 2025 | 75.1°F | −0.9°F | 0.02 in |
| 2026 | 77.8°F | +1.8°F | 2.54 in |
Source: records: ACIS, NWS threaded record MDHthr; recent months: ACIS, station USW00093810. Records and recent months use complete months only.
How does August in Carbondale compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, August normal highs run from 79°F in Barrington to 89°F in Anna; Carbondale's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.