Hiroshima WBGT Today — Wet Bulb Globe Temperature
Updated planning preview · 12:00 forecast from WeatherAPI
Estimated WBGT
26.9°C
High
Shorten hard efforts and increase recovery time.
Temperature
28°C
Humidity
67%
Heat index
31°C
UV index
7.9
Best outdoor window
18:00–9:00
Lowest combined heat and UV load in the available hourly preview.
Hourly WBGT
WBGT values are labeled as modeled estimates until a provider supplies measured readings.
| Time | Temperature | Heat index | Estimated WBGT | UV | Risk |
|---|---|---|---|---|---|
| 12 | 28°C | 31°C | 26.9°C | 7.9 | Moderate |
| 14 | 28°C | 31°C | 26.8°C | 5.9 | Moderate |
| 16 | 27°C | 30°C | 26.5°C | 1.8 | Moderate |
| 18 | 24°C | 26°C | 25.1°C | 0.0 | Low |
| 7 | 23°C | 25°C | 24.2°C | 0.4 | Low |
| 9 | 25°C | 28°C | 25.5°C | 3.3 | Moderate |
| 11 | 27°C | 30°C | 26.2°C | 7.4 | Moderate |
| 13 | 28°C | 30°C | 26.3°C | 7.1 | Moderate |
Today's outlook
In Hiroshima, the highest modeled heat burden in this preview occurs around 13:00. The recommended window is selected from the lowest combined risk score, temperature, and UV—not from generic city copy.
Three-day forecast
Sunday
Heat index up to 31°C
28°C / 21°C
ModerateMonday
Heat index up to 30°C
28°C / 21°C
ModerateTuesday
Heat index up to 27°C
25°C / 19°C
ModerateToday in Hiroshima
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
31°C at 12:00
The preview low is 25°C around 7:00.
Feels-like difference
3°C above air temp
Current humidity is 67%, one input that changes evaporative cooling.
Peak UV
7.9 at 12:00
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
1°C cooler tomorrow
Today's forecast range is 21°C–28°C.
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 Hiroshima, Japan
Hiroshima's hot, humid summer conditions can keep heat stress elevated through outdoor work, travel and sport. Compare the hourly modeled trend with Japan's official WBGT observation and current heat-stroke alert.
Forecasts describe outdoor conditions, not an individual's medical risk. Workload, duration, shade, clothing, acclimatization and health can change the appropriate decision.
Check Japan Ministry of the Environment WBGT forecast ↗Nearby forecasts
Keep planning
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