Louisville, KY weather in August
Louisville is hot and often humid in August, with some rain: highs average 88°F and nights drop to about 70°F. There are about 8 days with rain. This is the peak of the warm season in Louisville.
- Normal high
- 88°F
- Normal low
- 70°F
- Wet days
- 8
- 3.7 in total
- Muggy days
- 18
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 89°F | 87°F |
| Normal low | 71°F | 67°F |
| Chance of a wet day | 29% | 26% |
| Sunrise / sunset | 6:45 am / 8:52 pm | 7:11 am / 8:14 pm |
| Daylight | 14.1 h | 13.1 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical August day
- 6 am70°Fdew point 65°F
- 9 am76°Fdew point 66°F
- Noon83°Fdew point 66°F
- 3 pm86°Fdew point 65°F
- 6 pm84°Fdew point 65°F
- 9 pm78°Fdew point 65°F
NOAA hourly normals (local standard time) from Louisville Intl Airport (5 mi away); average wind 6 mph; clear or few clouds in 58% of daytime hours, mostly cloudy or overcast in 29%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 31
- Hot dayshigh 90°F or more13 of 31
- Muggy daysdaily mean dew point 65°F or more18 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in5 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 3.7 in; a dry August brings about 2.2 in and a wet one about 5.5 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202007: average high 96°F
- Coolest August1992: average high 83°F
- Wettest August2018: 7.2 in
- Driest August2008: 0.6 in
- Highest reading105°F (August 16, 2007)
- Lowest reading53°F (August 29, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 89°F | 88°F | 82°F |
| Normal low | 71°F | 70°F | 62°F |
| Wet days | 10 | 8 | 8 |
| Comfortable days | 1 | 1 | 9 |
| Daylight | 14.5 h | 13.6 h | 12.4 h |
Highs change by -1°F from July and -6°F into September.
Nearby alternatives in August
- Cooler: Fishers, IN125 mi · high 82°F · 10 wet days
How Louisville ranks in August
- Normal high160th warmest of 378 cities; 2nd of 3 in Kentucky
- Wet days161st driest of 378
- Comfortable days189th most of 341
What to pack for Louisville in August
- Light, breathable clothing – highs near 88°F and about 18 muggy days
- A rain jacket or umbrella – rain on about 8 days
Heating and cooling
August has 0 heating degree days and 433 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is Louisville in August?
The normal high is 88°F and the normal low is 70°F. From 1991 to 2020 the hottest August reading was 105°F (August 16, 2007).
Does it rain a lot in Louisville in August?
About 8 days in August have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest August in 1991-2020 was in 2018 (7.2 in); the driest was in 2008 (0.6 in).
Is August a good time to visit Louisville?
August ranks 8th of 12 months on our comfort score for Louisville (46 out of 100). It has about 1 comfortable day and about 13 days at 90°F or hotter. The best months are April, May and October.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates and humidity and wind by hour: Louisville Intl Airport (USW00093821), 5.0 mi WNW of the city center, 488 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Louisville Bowman Fld (USW00013810), 4.3 mi N of the city center, 540 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Louisville Intl-Standiford Field Airport (724230-93821), 4.5 mi W of the city center, 480 ft . Hourly observations, 1991-2020.