Louisville in Summer
In summer (June, July and August), Louisville sees average daytime highs around 77°F and overnight lows near 51°F, with 8.8 in of precipitation over about 44 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 70°F in early June to 76°F by late August. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels dry.
Summer is Louisville's best season of the year to visit on our travel score. For the whole year in context, see Louisville's year-round climate.
- Avg daytime high
- 77°F
- warmest season of the year
- Avg overnight low
- 51°F
- Precipitation
- 8.8 in
- 44 wet days
- Avg wind
- 4 mph
- Travel score
- 6.1
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Louisville in Summer
Over the season highs climb from about 70°F in early June to 76°F by late August.
A typical summer day in Louisville reaches about 77°F and drops to 51°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Louisville
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Louisville weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 37° / 14° | 0.9 | 5.7 | 5.5 | 9.5 | 0.0 |
| Feb | 39° / 16° | 1.0 | 6.7 | 7 | 10.4 | 0.0 |
| Mar | 48° / 22° | 2.0 | 8.8 | 7.2 | 11.7 | 1.7 |
| Apr | 54° / 29° | 3.1 | 11.1 | 7.9 | 13 | 3.1 |
| May | 63° / 38° | 4.0 | 14.9 | 3.5 | 14.2 | 4.8 |
| Jun | 74° / 47° | 3.0 | 14.3 | 0.3 | 14.8 | 6.2 |
| Jul | 80° / 53° | 3.0 | 14.8 | 0 | 14.5 | 6.0 |
| Aug | 78° / 52° | 2.8 | 14.9 | 0 | 13.6 | 6.2 |
| Sep | 71° / 44° | 2.1 | 9.7 | 0.9 | 12.3 | 6.8 |
| Oct | 58° / 33° | 1.9 | 7.4 | 3.9 | 10.9 | 4.9 |
| Nov | 46° / 22° | 1.3 | 6.4 | 5.7 | 9.8 | 1.4 |
| Dec | 37° / 15° | 0.9 | 5.3 | 5.4 | 9.2 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
Louisville gets around 8.8 in of rain and snow over 44 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 4 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 36 min in early June to 13 hours by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.1 kWh/m².
Hazard calendar for Louisville
In summer, Louisville overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Louisville's rainy season runs March–October, when most of the year's rain falls.
Is summer a good time to visit Louisville?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Louisville for sightseeing.
What to pack for Louisville in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Louisville sees daytime highs around 77°F and nights near 51°F. Pack rain gear and sun protection. Worth having: light clothes. About 44 days see rain.
UV index in Louisville in Summer
Clear-sky midday UV across summer averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Louisville peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 7 | 6 | 7 | 11 | 11 | 10 | 7 | 5 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 7 | High |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Louisville in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Louisville is worst in August — around 21 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (May, 13 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 17 | 15 | 16 | 13 | 13 | 14 | 14 | 21 | 13 | 15 | 15 | 16 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 15 | Moderate |
| Mar | 16 | Moderate |
| Apr | 13 | Moderate |
| May | 13 | Moderate |
| Jun | 14 | Moderate |
| Jul | 14 | Moderate |
| Aug | 21 | Moderate |
| Sep | 13 | Moderate |
| Oct | 15 | Moderate |
| Nov | 15 | Moderate |
| Dec | 16 | Moderate |
Where is Louisville?
Louisville sits at 40.0°N, 105.1°W, 5,335 ft above sea level, in United States. The nearest listed city is Lafayette, 2.5 mi away.
Topography around Louisville
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Louisville.
Within 2 miles, the terrain around Louisville has only modest variations in elevation — a maximum elevation change of 430 ft around an average of 5,377 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,547 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,682 ft.
The land around Louisville is covered by grassland (37%), artificial surfaces (30%) and trees (21%) within 2 miles, grassland (50%) and artificial surfaces (21%) within 10 miles, and grassland (38%) and trees (35%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Louisville (39.9778°, -105.1319°, elevation 5,335 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.