Waukesha weather in August: Waukesha, Wisconsin: normal highs, lows, rain and records for August
Waukesha in August has a normal high of 80°F and a normal low of 59°F, a daily mean of 69°F, falling from 81°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 4.18 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 106 mm of precipitation in August.
- NOAA stationWaukesha Wastewater Treatment Plant
- Station IDUSC00478937
- Location43.01°N 88.25°W
- Elevation789 ft (241 m)
- Population71,461
- Jan 28° 12°
- Feb 32° 15°
- Mar 43° 24°
- Apr 55° 35°
- May 67° 46°
- Jun 77° 56°
- Jul 81° 60°
- Aug 80° 59°
- Sep 73° 51°
- Oct 60° 40°
- Nov 45° 28°
- Dec 33° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Waukesha in August?
The normal high is 80°F and the normal low 59°F, for a daily mean of 69.4°F. August is 1.5°F cooler than July and 7.4°F warmer than September. August is the 2nd warmest month of the year in Waukesha and the 2nd wettest. Across the month the normal high falls 3°F, from 81°F on August 1 to 78°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 72°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 60°F | 30% | 20% |
| August 8 | 81°F | 60°F | 29% | 20% |
| August 15 | 80°F | 59°F | 29% | 20% |
| August 22 | 80°F | 59°F | 29% | 21% |
| August 31 | 78°F | 57°F | 29% | 21% |
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 | 81°F | 60°F | 30% | 20% | 14 h 30 min |
| August 2 | 81°F | 60°F | 30% | 20% | 14 h 30 min |
| August 3 | 81°F | 60°F | 30% | 20% | 14 h 30 min |
| August 4 | 81°F | 60°F | 30% | 20% | 14 h 30 min |
| August 5 | 81°F | 60°F | 29% | 20% | 14 h 20 min |
| August 6 | 81°F | 60°F | 29% | 20% | 14 h 20 min |
| August 7 | 81°F | 60°F | 29% | 20% | 14 h 20 min |
| August 8 | 81°F | 60°F | 29% | 20% | 14 h 20 min |
| August 9 | 80°F | 60°F | 29% | 20% | 14 h 10 min |
| August 10 | 80°F | 60°F | 29% | 20% | 14 h 10 min |
| August 11 | 80°F | 60°F | 29% | 20% | 14 h 10 min |
| August 12 | 80°F | 60°F | 29% | 20% | 14 h 10 min |
| August 13 | 80°F | 60°F | 29% | 20% | 14 h |
| August 14 | 80°F | 59°F | 29% | 20% | 14 h |
| August 15 | 80°F | 59°F | 29% | 20% | 14 h |
| August 16 | 80°F | 59°F | 29% | 20% | 14 h |
| August 17 | 80°F | 59°F | 29% | 20% | 13 h 50 min |
| August 18 | 80°F | 59°F | 29% | 21% | 13 h 50 min |
| August 19 | 80°F | 59°F | 29% | 21% | 13 h 50 min |
| August 20 | 80°F | 59°F | 29% | 21% | 13 h 50 min |
| August 21 | 80°F | 59°F | 29% | 21% | 13 h 40 min |
| August 22 | 80°F | 59°F | 29% | 21% | 13 h 40 min |
| August 23 | 79°F | 58°F | 29% | 21% | 13 h 40 min |
| August 24 | 79°F | 58°F | 29% | 21% | 13 h 40 min |
| August 25 | 79°F | 58°F | 29% | 21% | 13 h 30 min |
| August 26 | 79°F | 58°F | 29% | 21% | 13 h 30 min |
| August 27 | 79°F | 58°F | 29% | 21% | 13 h 30 min |
| August 28 | 79°F | 57°F | 29% | 21% | 13 h 30 min |
| August 29 | 78°F | 57°F | 29% | 21% | 13 h 20 min |
| August 30 | 78°F | 57°F | 29% | 21% | 13 h 20 min |
| August 31 | 78°F | 57°F | 29% | 21% | 13 h 20 min |
- Normal high
- 80°FAugust average
- Normal low
- 59°FAugust average
- Precipitation
- 4.18 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 14 h 30 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 18
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00478937; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Waukesha in August?
On a given August day the chance of 0.01 inch or more is 29% on average, highest around August 1 (30%). In all, 4.18 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Waukesha, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00478937.
What are the records for August in Waukesha?
The warmest August temperature on this station's record (since 1894) is 102°F, on August 6, 1918; the coldest is 35°F, on August 28, 1915. The wettest August brought 10.83 in (1995).
The August mean against the 1991-2020 normal of 69.4°F: 2024 68.9°F (−0.5), 2025 68.1°F (−1.3), 2026 71.2°F (+1.8). 1 of 3 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2024 | 68.9°F | −0.5°F | 3.26 in |
| 2025 | 68.1°F | −1.3°F | 8.75 in |
| 2026 | 71.2°F | +1.8°F | 4.75 in |
Source: records: ACIS, station USC00478937; recent months: ACIS, station USC00478937. Records and recent months use complete months only.
How does August in Waukesha compare across Wisconsin?
Across the 165 places PlainClimate covers in Wisconsin, August normal highs run from 71°F in Laona to 83°F in Lake Geneva; Waukesha's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.