Louisville, Kentucky Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Louisville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——82°59°—
- ThursdayJun 4Overcast——83°63°+1°
- FridayJun 5Overcast——86°65°+3°
- SaturdayJun 6Overcast10%—87°66°+1°
- SundayJun 7Light Showers25%—87°70°0°
- MondayJun 8Showers20%—86°70°-1°
- TuesdayJun 9Drizzle23%—78°69°-8°
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. AQI up 25 in the last 6 hours — air quality is degrading. Levels should ease through evening.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 500
- UV peak
- 1.5 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 500
PM × Wind × Precip
PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.83 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.83
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 3:27 AM
- Moonset
- 12:47 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Louisville at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 5 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July brings Louisville's warmest temperatures at around 78°F mean, while January delivers the coldest at roughly 34°F. Rainfall reaches its peak in May with 5.8 inches and drops to its lowest point in August at 3.3 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 34° | 3.8″ | 7 |
| February | 38° | 3.7″ | 7 |
| March | 47° | 5.1″ | 8 |
| April | 57° | 5.3″ | 9 |
| May | 66° | 5.8″ | 9 |
| June | 74° | 4.9″ | 8 |
| July | 78° | 4.7″ | 8 |
| August | 77° | 3.3″ | 6 |
| September | 70° | 3.8″ | 5 |
| October | 59° | 4.2″ | 6 |
| November | 47° | 3.9″ | 6 |
| December | 38° | 4.6″ | 8 |
Regional context
Louisville belongs to the humid subtropical climate region, sharing similar temperature ranges, seasonal patterns, and growing conditions with other nearby cities in this climate zone.
Similar climates: Lexington, KY, Bowling Green, KY, Elizabethtown, KY, Owensboro, KY, Covington, KY.
Naturalist notes
Late April often brings the distinctive call of wood thrushes returning to Louisville's woodlands as spring migration peaks.
Redbud trees typically bloom in early April, their purple-pink flowers appearing before the leaves emerge.
Frequently asked
- When does it freeze in Louisville?
- Spring's last frost typically occurs around mid-April in Louisville, while the first fall frost usually arrives around mid-November.
- What is the rainy season in Louisville?
- May stands as the wettest month, bringing about 5.8 inches of rain on average, while the city receives roughly 53 inches annually.
- What is the warmest month in Louisville?
- July typically records the warmest temperatures, averaging about 78°F.
- What is the coldest month in Louisville?
- January typically brings the coldest temperatures, averaging about 34°F.
- When can I start a vegetable garden in Louisville?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-April, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Louisville get?
- Louisville sees about 85 rainy days per year on average.
- What hardiness zone is Louisville?
- Louisville's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool using the city ZIP code provides the current zone designation.
Climate
Louisville, Kentucky experiences a humid subtropical climate zone. January temperatures hover near 34°F while July averages reach 78°F, creating a 43°F seasonal swing.
Annual precipitation totals about 53 inches across roughly 85 rainy days throughout the year.
Weather patterns here follow the city's latitude of 38.2°N, along with proximity to large water bodies and elevation. These factors determine what grows locally, frost timing, and daily weather conditions.