Louisville Heat Index Today
Updated planning preview · 7:00 PM forecast from WeatherAPI
Heat index
86°F
Moderate
Use normal heat precautions and take breaks.
Temperature
82°F
Humidity
64%
Estimated WBGT
26.1°C
UV index
0.5
Best outdoor window
7:00 PM–10:00 AM
Lowest combined heat and UV load in the available hourly preview.
Hourly heat risk
WBGT values are labeled as modeled estimates until a provider supplies measured readings.
| Time | Temperature | Heat index | Estimated WBGT | UV | Risk |
|---|---|---|---|---|---|
| 7 PM | 82°F | 86°F | 26.1°C | 0.5 | Moderate |
| 8 AM | 68°F | 68°F | 20.9°C | 0.3 | Low |
| 10 AM | 74°F | 77°F | 22.8°C | 2.5 | Low |
| 12 PM | 80°F | 83°F | 24.8°C | 6.5 | Moderate |
| 2 PM | 81°F | 84°F | 25.1°C | 8.1 | Moderate |
| 4 PM | 84°F | 87°F | 25.9°C | 5.4 | Moderate |
| 6 PM | 83°F | 85°F | 25.4°C | 1.4 | Moderate |
| 8 PM | 80°F | 83°F | 25.2°C | 0.0 | Moderate |
Today's outlook
In Louisville, the highest modeled heat burden in this preview occurs around 8:00 PM. The recommended window is selected from the lowest combined risk score, temperature, and UV—not from generic city copy.
Three-day forecast
Thursday
Heat index up to 96°F
88° / 68°
HighFriday
Heat index up to 87°F
84° / 68°
ModerateSaturday
Heat index up to 87°F
87° / 70°
ModerateToday in Louisville
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
87°F at 4:00 PM
The preview low is 68°F around 8:00 AM.
Feels-like difference
4°F above air temp
Current humidity is 64%, one input that changes evaporative cooling.
Peak UV
8.1 at 2:00 PM
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
9°F cooler tomorrow
Today's forecast range is 68–88°F.
Where these numbers come from
WeatherAPI supplies the forecast. HeatGuard calculates heat-index risk and models WBGT from forecast temperature, humidity and a daytime solar allowance. Modeled WBGT is not an on-site globe-thermometer reading.
Keep planning
Track Louisville in HeatGuard
Save this location and get alerts as conditions change.