Louisville, KY 40233 Weather

Jefferson County12:26 AM EDT38.19°N, 85.68°W
Special Weather Statement until 5:00 AM Wed

Current conditions

Clear
48°
Clear
Feels like 48°
High 72°·Low 45° tonight
WindCalm
Humidity93%
Dew point46°
Pressure30.29 inHg
Visibility10 mi
Cloud cover2%
UV index0 Low
Sunrise7:58 AM
Sunset6:58 PM

Observed at Louisville, Bowman Field Airport · 36 min ago

Forecast

10-day

  • Tonight

    Clear, with a low around 45. East wind around 2 mph.

  • Wednesday

    Sunny, with a high near 72. Northeast wind 0 to 5 mph.

  • Wednesday Night

    Patchy fog after 2am. Clear, with a low around 46. North wind 1 to 5 mph.

National Weather Service forecast updated 2 hrs ago.

Hourly

Hourly forecast
  1. Now Clear 52°
  2. 1 AM Clear 50°
  3. 2 AM Clear 49°
  4. 3 AM Clear 48°
  5. 4 AM Clear 47°
  6. 5 AM Clear 46°
  7. 6 AM Sunny 46°
  8. 7 AM Sunny 45°
  9. 8 AM Sunny 45°
  10. 9 AM Sunny 47°
  11. 10 AM Sunny 53°
  12. 11 AM Sunny 59°
  13. 12 PM Sunny 63°
  14. 1 PM Sunny 67°
  15. 2 PM Sunny 70°
  16. 3 PM Sunny 71°
  17. 4 PM Sunny 72°
  18. 5 PM Sunny 72°
  19. 6 PM Clear 70°
  20. 7 PM Clear 67°
  21. 8 PM Clear 62°
  22. 9 PM Clear 58°
  23. 10 PM Clear 55°
  24. 11 PM Clear 54°

10-day forecast

Details
  1. TonightOct 20 Clear Clear45°
  2. TodayOct 21 Sunny Sunny46°72°
  3. ThuOct 22 Patchy Fog then Sunny Patchy Fog then Sunny45°73°
  4. FriOct 23 Sunny Sunny45°70°
  5. SatOct 24 Sunny Sunny47°73°
  6. SunOct 25 Mostly Sunny Mostly Sunny48°75°
  7. MonOct 26 Mostly Sunny Mostly Sunny50°74°
  8. TueOct 27 Mostly Sunny Mostly Sunny68°
  9. WedOct 28 Cloudy Cloudy51°63°
  10. ThuOct 29 Sunny Sunny43°59°

Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.

Radar

Full map
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Weather news near Louisville

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Air quality

55
Moderate
Fine particles (PM2.5)

Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Forecast

  • WedModerate

Louisville, KY reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.

Sun & moon

Sunrise 7:58 AM
Sunset 6:58 PM
Daylight 11 h 0 min (−2 min 20 s tomorrow)
Waxing Gibbous · 74% lit
Moonrise 4:33 PM Moonset 3:05 AM
Full moon Oct 26 New moon Nov 9

Almanac

Monthly
Normal high / low68° / 48°
Record high88° (1953)
Record low24° (1952)
Wettest2.18 in (1929)
Month to date2.12 in (normal 2.48 in)

Louisville Area, records since 1872. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).

Nearby

Forecasters' discussion

From the National Weather Service office in LMK, issued 5 hrs ago

Key Messages

* Highs in the low 70s with lows in the 40s and isolated 30s will continue through the weekend.

* Patchy dense valley fog is expected to form again tonight and into the morning hours, slowly becoming patchier and isolated heading towards and west of I-65.

* Stubborn ridging promotes a prolonged dry period with pleasant afternoons through at least early next week.

Discussion

Issued at 225 PM EDT Tue Oct 20 2026

====== Dense River Valley Fog & Warm Afternoons =====

There is a mid to upper level low swinging through southern KY and can see the swirl on water vapor imagery. This is just bringing passing high level clouds in our SE. Light northeasterly flow is keeping temperatures mild in the upper 60s to low 70s across the area. Arguably, the most exciting thing to monitor would be dew points today and for the following days. This will determine how dry and comfortable each afternoon will feel, along with the chances of fog formation each morning as well. Relative humidity values are generally bottoming out in the low and mid 30s but will recover to near 100% overnight and into tomorrow morning.

Low temperatures tonight will reach the low to mid 40s and mid to upper 30s in our deepest, decoupled river valleys. Just as this morning, dense fog will likely form in river valleys in the east, becoming more patchy dense fog in valleys west of I-65. As we saw this morning, fog will dissipate by late morning, with the latest being near 10-11 AM EDT in eastern areas. Then by Wednesday afternoon, the locked in ridge pattern overhead will lock in sunny skies and generally light N-NE flow. As long as the deep low off the east coast and troughing over the western US continues, our pattern will remain the same.

We'll have to monitor the dew points tomorrow as well as this will alter fog chances for Thursday morning. Fog may become more prevalent by then, but this will be fine tuned between now and tomorrow night.

===== Stubborn Ridging and Next Potential Rain Chance =====

Aviation

Issued at 723 PM EDT Tue Oct 20 2026

VFR conditions are expected to continue through this TAF period. Light winds out of the northeast will continue before backing to the north Wednesday afternoon. Skies will remain clear through Wednesday. Fog will be possible in river valleys and patchy over southern Indiana.

Lmk Watches

KY...None. IN...None.

Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.