Honolulu Heat Index Today
Updated planning preview · 5:00 PM forecast from WeatherAPI
Heat index
81°F
Moderate
Use normal heat precautions and take breaks.
Temperature
78°F
Humidity
70%
Estimated WBGT
24.5°C
UV index
0.9
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 |
|---|---|---|---|---|---|
| 5 PM | 78°F | 81°F | 24.5°C | 0.9 | Moderate |
| 7 AM | 76°F | 79°F | 24.2°C | 0.0 | Low |
| 9 AM | 78°F | 81°F | 24.6°C | 2.6 | Moderate |
| 11 AM | 79°F | 82°F | 24.9°C | 8.3 | Moderate |
| 1 PM | 79°F | 82°F | 25.0°C | 9.9 | Moderate |
| 3 PM | 79°F | 82°F | 24.9°C | 5.3 | Moderate |
| 5 PM | 78°F | 81°F | 24.6°C | 0.7 | Moderate |
| 7 AM | 76°F | 79°F | 24.0°C | 0.0 | Low |
Today's outlook
In Honolulu, 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
Monday
Heat index up to 82°F
79°F / 76°F
ModerateTuesday
Heat index up to 82°F
79°F / 75°F
ModerateWednesday
Heat index up to 83°F
79°F / 76°F
ModerateToday in Honolulu
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
82°F at 1:00 PM
The preview low is 79°F around 7:00 AM.
Feels-like difference
3°F above air temp
Current humidity is 70%, one input that changes evaporative cooling.
Peak UV
9.9 at 1:00 PM
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
about steady tomorrow
Today's forecast range is 76°F–79°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.
Local planning context
Planning for heat in Honolulu, HI
Honolulu conditions can vary with marine influence, elevation, cloud cover and distance from the coast. Use this city forecast as a planning reference and check a more local official forecast when the activity takes place in a different microclimate.
Forecasts describe outdoor conditions, not an individual's medical risk. Workload, duration, shade, clothing, acclimatization and health can change the appropriate decision.
Nearby forecasts
Keep planning
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