Jacksonville Heat Index Today
Updated planning preview · 7:00 PM forecast from WeatherAPI
Heat index
102°F
High
Reduce prolonged exertion and plan extra recovery.
Temperature
92°F
Humidity
55%
Estimated WBGT
30.0°C
UV index
0.1
Best outdoor window
7:00 PM–9:00 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 | 92°F | 102°F | 30.0°C | 0.1 | High |
| 7 AM | 78°F | 81°F | 25.1°C | 0.0 | Moderate |
| 9 AM | 81°F | 85°F | 26.0°C | 0.8 | Moderate |
| 11 AM | 90°F | 95°F | 28.1°C | 5.3 | High |
| 1 PM | 96°F | 101°F | 29.6°C | 8.4 | High |
| 3 PM | 96°F | 100°F | 29.3°C | 6.5 | High |
| 5 PM | 90°F | 94°F | 27.9°C | 1.1 | High |
| 7 PM | 82°F | 86°F | 26.2°C | 0.2 | Moderate |
Today's outlook
In Jacksonville, the highest modeled heat burden in this preview occurs around 5:00 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 121°F
100° / 75°
Very highFriday
Heat index up to 103°F
98° / 77°
HighSaturday
Heat index up to 102°F
95° / 76°
HighToday in Jacksonville
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
102°F at 7:00 PM
The preview low is 81°F around 7:00 AM.
Feels-like difference
10°F above air temp
Current humidity is 55%, one input that changes evaporative cooling.
Peak UV
8.4 at 1:00 PM
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
19°F cooler tomorrow
Today's forecast range is 75–100°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
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