Louisville, Kentucky Weather
Thunder quiets the land. Day 93 of summer. Read this microseason across nine climate regions →
Louisville weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:30 AM EDT · Open-Meteo
- TodaySep 21Overcast later19%—89°70°—
- TuesdaySep 22Overcast10%—74°66°-15°
- WednesdaySep 23Overcast——73°65°-1°
- ThursdaySep 24Overcast——76°61°+3°
- FridaySep 25Overcast——78°59°+2°
- SaturdaySep 26Overcast——63°53°-15°
- SundaySep 27Overcast——78°60°+15°
Air quality now AQI 45 · Good
AQI 45 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.9 µg/m³ (AQI 44) with a 0.99 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 7.9 µg/m³ (AQI 44) with a 0.99 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.99
- Wind
- calm
- 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).
September dries up ditches or breaks down bridges.
- Moonrise
- 5:09 PM
- Moonset
- 2:09 AM
- In sign
- ♑︎ Capricorn
Thunder quiets the land
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Louisville at a glance
- Today vs. normal: Today averages 80°F (high 89°F, low 70°F), 11°F above the 69°F normal for Sep 21
- Last frost: April 6 (1991–2020 median, NOAA station 6 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Louisville
- Mon88°70°19%
- Tue74°66°10%
- Wed73°65°3%
- Thu76°61°1%
- Fri78°59°0%
- Sat63°53°1%
- Sun78°60°2%
- Mon81°55°5%
- Tue85°59°19%
- Wed83°64°22%
- Thu78°55°16%
- Fri80°54°13%
- Sat76°62°13%
- Sun85°64°19%
- Mon93°66°13%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Louisville
Interactive wind and temperature map centered on Louisville — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically November 1) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — Louisville
SPC includes Louisville in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Louisville
Louisville sits in Jefferson County, where the year’s longest day runs 14h 49m of daylight and its shortest just 9h 30m — a swing of +5h 19m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Louisville is the state’s largest city. The nearest town Louisville tracks is Lexington, roughly 65 miles to the E.
Air quality in Louisville
Air quality in Louisville’s county has held roughly steady since 2020; its cleanest year on record was 2025 (median AQI 49). See the full air-quality history for Louisville.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | beans, squash | lettuce, peas, spinach, beans, summer squash, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
In Louisville, July runs warmest near 79°F and January coldest around 35°F, while May is the wettest month (4.8 inches) and August the driest (3.3 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 35° | 3.5″ | 6 |
| February | 38° | 3.5″ | 6 |
| March | 47° | 4.5″ | 8 |
| April | 58° | 4.8″ | 8 |
| May | 68° | 4.8″ | 8 |
| June | 76° | 4.4″ | 8 |
| July | 79° | 3.5″ | 6 |
| August | 78° | 3.3″ | 6 |
| September | 72° | 3.9″ | 5 |
| October | 60° | 3.5″ | 5 |
| November | 47° | 3.8″ | 6 |
| December | 39° | 4.5″ | 7 |
Regional context
Similar climates Hollow Creek, KY, Spring Mill, KY, West Buechel, KY
Louisville swings from 35°F in January to 79°F in July (45°F) per NOAA NCEI 1991-2020 normals; precipitation in Louisville runs about 48 inches on roughly 79 measurable days.
Louisville's precipitation spreads evenly across the seasons: May peaks at 4.8 inches on 8.0 wet days, while August holds 3.3 inches over 5.5 — no season dominates Louisville's rain calendar. It is a balanced pattern Louisville shares with places like Hollow Creek, KY, Spring Mill, KY and West Buechel, KY.
Once Louisville passes April 6, freezes fade and Louisville's beds take peas, lettuce, spinach, and radishes. Tomatoes and peppers do best set out two weeks later in Louisville, once nights clear the mid-40s°F. By November 1, frost is back in Louisville — protect or harvest anything tender. That date is a median: Louisville freezes sooner in half of years.
Similar climates: Hollow Creek, KY, Spring Mill, KY, West Buechel, KY, Poplar Hills, KY, Watterson Park, KY.
Frequently asked
- When does it freeze in Louisville?
- Frost typically leaves Louisville by April 6 and returns to Louisville near November 1.
- What is the rainy season in Louisville?
- Rainfall in Louisville peaks in May near 4.8 inches, out of about 48 inches annually.
- What is the warmest month in Louisville?
- July is Louisville's warmest month, averaging about 79°F.
- What is the coldest month in Louisville?
- Louisville bottoms out in January, with a mean near 35°F.
- When can I start a vegetable garden in Louisville?
- Louisville's last frost (April 6) cues hardy greens; in Louisville, hold heat-lovers two weeks past.
- How many rainy days does Louisville get?
- Louisville records around 79 days of measurable precipitation annually.
- What hardiness zone is Louisville?
- Louisville sits in the USDA zone set by January lows near 35°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Louisville?
- Louisville's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Louisville?
- See this week's day-by-day rain chances for Louisville in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Louisville?
- Current conditions for Louisville and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Louisville forecast updated?
- The Louisville forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Louisville?
- Today's sunrise and sunset times for Louisville are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Louisville?
- The next few days in Louisville's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Louisville sits at 38.2°N; its climate zone is humid subtropical (Köppen approximation).
ZIP codes in Louisville
- 40018
- 40023
- 40027
- 40059
- 40118
- 40202
- 40203
- 40204
- 40205
- 40206
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- 40280
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- 40299