Normal weather in August: Normal, Illinois: normal highs, lows, rain and records for August
Normal in August has a normal high of 84°F and a normal low of 61°F, a daily mean of 73°F, falling from 85°F on the 1st to 83°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 16°C, 97 mm of precipitation in August.
- NOAA stationNormal (4 mi NE)
- Station IDUSC00116200
- Location40.55°N 88.95°W
- Elevation790 ft (241 m)
- Population53,304
- Jan 33° 16°
- Feb 38° 19°
- Mar 50° 28°
- Apr 63° 38°
- May 74° 50°
- Jun 83° 60°
- Jul 86° 63°
- Aug 84° 61°
- Sep 79° 53°
- Oct 66° 42°
- Nov 50° 31°
- Dec 38° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Normal in August?
The normal high is 84°F and the normal low 61°F, for a daily mean of 72.6°F. August is 1.9°F cooler than July and 6.7°F warmer than September. August is the 2nd warmest month of the year in Normal and the 4th wettest. Across the month the normal high falls 2°F, from 85°F on August 1 to 83°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 70°F and 75°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 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 85°F | 62°F | 28% | 20% |
| August 8 | 85°F | 62°F | 29% | 20% |
| August 15 | 85°F | 61°F | 29% | 20% |
| August 22 | 84°F | 60°F | 29% | 21% |
| August 31 | 83°F | 58°F | 28% | 20% |
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 | 85°F | 62°F | 28% | 20% | 14 h 20 min |
| August 2 | 85°F | 62°F | 28% | 20% | 14 h 20 min |
| August 3 | 85°F | 62°F | 28% | 20% | 14 h 20 min |
| August 4 | 85°F | 62°F | 28% | 20% | 14 h 10 min |
| August 5 | 85°F | 62°F | 28% | 20% | 14 h 10 min |
| August 6 | 85°F | 62°F | 28% | 20% | 14 h 10 min |
| August 7 | 85°F | 62°F | 29% | 20% | 14 h 10 min |
| August 8 | 85°F | 62°F | 29% | 20% | 14 h 10 min |
| August 9 | 85°F | 62°F | 29% | 20% | 14 h |
| August 10 | 85°F | 62°F | 29% | 20% | 14 h |
| August 11 | 85°F | 62°F | 29% | 20% | 14 h |
| August 12 | 85°F | 62°F | 29% | 20% | 14 h |
| August 13 | 85°F | 61°F | 29% | 20% | 13 h 50 min |
| August 14 | 85°F | 61°F | 29% | 20% | 13 h 50 min |
| August 15 | 85°F | 61°F | 29% | 20% | 13 h 50 min |
| August 16 | 85°F | 61°F | 29% | 20% | 13 h 50 min |
| August 17 | 85°F | 61°F | 29% | 20% | 13 h 50 min |
| August 18 | 84°F | 61°F | 29% | 21% | 13 h 40 min |
| August 19 | 84°F | 61°F | 29% | 21% | 13 h 40 min |
| August 20 | 84°F | 61°F | 29% | 21% | 13 h 40 min |
| August 21 | 84°F | 60°F | 29% | 21% | 13 h 40 min |
| August 22 | 84°F | 60°F | 29% | 21% | 13 h 30 min |
| August 23 | 84°F | 60°F | 28% | 21% | 13 h 30 min |
| August 24 | 84°F | 60°F | 28% | 21% | 13 h 30 min |
| August 25 | 84°F | 60°F | 28% | 21% | 13 h 30 min |
| August 26 | 84°F | 60°F | 28% | 20% | 13 h 20 min |
| August 27 | 84°F | 59°F | 28% | 20% | 13 h 20 min |
| August 28 | 83°F | 59°F | 28% | 20% | 13 h 20 min |
| August 29 | 83°F | 59°F | 28% | 20% | 13 h 20 min |
| August 30 | 83°F | 59°F | 28% | 20% | 13 h 10 min |
| August 31 | 83°F | 58°F | 28% | 20% | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 61°FAugust average
- Precipitation
- 3.83 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 25
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00116200; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Normal in August?
On a given August day the chance of 0.01 inch or more is 28% on average, highest around August 17 (29%). In all, 3.83 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Normal, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00116200.
What are the records for August in Normal?
The warmest August temperature on this station's record (since 1893) is 105°F, on August 5, 1918; the coldest is 38°F, on August 31, 1915. The wettest August brought 12.76 in (1924).
The August mean against the 1991-2020 normal of 72.6°F: 2021 74.6°F (+2.0), 2022 72.6°F (at normal), 2023 72.7°F (+0.1), 2024 72.7°F (+0.1), 2025 72.1°F (−0.5), 2026 73.4°F (+0.8). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 74.6°F | +2.0°F | 5.08 in |
| 2022 | 72.6°F | at normal | 3.49 in |
| 2023 | 72.7°F | +0.1°F | 3.95 in |
| 2024 | 72.7°F | +0.1°F | 4.49 in |
| 2025 | 72.1°F | −0.5°F | 0.99 in |
| 2026 | 73.4°F | +0.8°F | 9.41 in |
Source: records: ACIS, station USC00116200; recent months: ACIS, station USC00116200. Records and recent months use complete months only.
How does August in Normal 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; Normal's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.