Climate averages 1991–2020
Louisville weather
in August.
A hot, moderately wet month: the 2nd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Louisville: daytime highs average 30.0°C and nights cool to about 20.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 71 mm of rain on roughly 9 days, which makes August a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 39 min on an average August day.
The nearest other city in this atlas is Lexington (116 km away). In August its highs average 29.1°C, 0.9°C cooler than Louisville, with 79 mm of rain.
Among the 498 cities listed in the United States, Louisville ranks joint 239th of 498 for the warmest August highs and joint 227th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Louisville is level with that mean.
From August to September, average highs fall by 3.5°C to 26.5°C, and monthly rainfall rises from 71 mm to 77 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Louisville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.2°C-2.9°C | -2.9°C | 91 | 9.7 | 9.810 h |
| February | 7.8°C-1.6°C | -1.6°C | 84 | 9.3 | 10.711 h |
| March | 13.0°C2.7°C | 2.7°C | 114 | 11.4 | 11.912 h |
| April | 19.1°C8.3°C | 8.3°C | 127 | 12.0 | 13.213 h |
| May | 23.9°C13.9°C | 13.9°C | 128 | 12.8 | 14.214 h |
| June | 28.5°C18.7°C | 18.7°C | 102 | 11.7 | 14.815 h |
| July | 30.4°C20.8°C | 20.8°C | 101 | 11.8 | 14.515 h |
| August, selected | 30.0°C20.2°C | 20.2°C | 71 | 9.1 | 13.614 h |
| September | 26.5°C16.5°C | 16.5°C | 77 | 7.7 | 12.512 h |
| October | 19.9°C10.2°C | 10.2°C | 85 | 8.1 | 11.211 h |
| November | 12.6°C4.0°C | 4.0°C | 89 | 9.3 | 10.110 h |
| December | 7.1°C-0.5°C | -0.5°C | 102 | 10.1 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Lexington in AugustUnited States · 116 kmHigh 29.1°C · Low 19.4°C · 79 mm rain
- Bloomington (Indiana), United States in AugustUnited States · 121 kmHigh 28.8°C · Low 19.3°C · 79 mm rain
- Cincinnati in AugustUnited States · 145 kmHigh 28.5°C · Low 18.9°C · 75 mm rain
- Evansville in AugustUnited States · 160 kmHigh 30.3°C · Low 21.4°C · 76 mm rain
- Indianapolis in AugustUnited States · 172 kmHigh 28.0°C · Low 18.9°C · 72 mm rain
- Fishers in AugustUnited States · 190 kmHigh 27.6°C · Low 18.4°C · 74 mm rain
- Carmel in AugustUnited States · 194 kmHigh 27.5°C · Low 18.5°C · 74 mm rain
- Dayton in AugustUnited States · 215 kmHigh 27.9°C · Low 18.9°C · 81 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Louisville) is explained once on the Louisville year overview and on the Sources, method and limits page.