Honolulu Heat Index Today
Updated planning preview · 1:00 PM forecast from WeatherAPI
Heat index
86°F
Moderate
Use normal heat precautions and take breaks.
Temperature
81°F
Humidity
71%
Estimated WBGT
26.2°C
UV index
12.7
Best outdoor window
5:00 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 |
|---|---|---|---|---|---|
| 1 PM | 81°F | 86°F | 26.2°C | 12.7 | Moderate |
| 3 PM | 81°F | 86°F | 26.2°C | 7.4 | Moderate |
| 5 PM | 81°F | 86°F | 26.3°C | 1.5 | Moderate |
| 7 AM | 77°F | 81°F | 25.3°C | 0.3 | Moderate |
| 9 AM | 79°F | 83°F | 25.7°C | 4.0 | Moderate |
| 11 AM | 81°F | 85°F | 26.1°C | 10.7 | Moderate |
| 1 PM | 81°F | 86°F | 26.4°C | 12.7 | Moderate |
| 3 PM | 82°F | 87°F | 26.7°C | 7.0 | Moderate |
Today's outlook
In Honolulu, the highest modeled heat burden in this preview occurs around 3:00 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 86°F
81° / 76°
ModerateFriday
Heat index up to 87°F
82° / 76°
ModerateSaturday
Heat index up to 84°F
80° / 77°
ModerateToday in Honolulu
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
87°F at 3:00 PM
The preview low is 81°F around 7:00 AM.
Feels-like difference
4°F above air temp
Current humidity is 71%, one input that changes evaporative cooling.
Peak UV
12.7 at 1:00 PM
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
2°F hotter tomorrow
Today's forecast range is 76–81°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.
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