Perth WBGT Today — Wet Bulb Globe Temperature
Updated planning preview · 11:00 am forecast from WeatherAPI
Estimated WBGT
15.5°C
Low
Typical activity may proceed with routine hydration.
Temperature
16°C
Humidity
66%
Heat index
16°C
UV index
4.3
Best outdoor window
5:00 pm–9:00 am
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 |
|---|---|---|---|---|---|
| 11 am | 16°C | 16°C | 15.5°C | 4.3 | Low |
| 1 pm | 17°C | 17°C | 15.8°C | 5.2 | Low |
| 3 pm | 17°C | 17°C | 15.9°C | 2.9 | Low |
| 5 pm | 17°C | 17°C | 16.0°C | 0.4 | Low |
| 7 am | 15°C | 15°C | 14.0°C | 0.2 | Low |
| 9 am | 17°C | 17°C | 14.9°C | 2.5 | Low |
| 11 am | 19°C | 19°C | 16.8°C | 6.6 | Low |
| 1 pm | 20°C | 20°C | 17.4°C | 7.4 | Low |
Today's outlook
In Perth, the highest modeled heat burden in this preview occurs around 1:00 pm. 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 17°C
17°C / 15°C
LowMonday
Heat index up to 20°C
20°C / 15°C
LowTuesday
Heat index up to 25°C
22°C / 15°C
LowToday in Perth
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
20°C at 1:00 pm
The preview low is 15°C around 7:00 am.
Feels-like difference
Matches air temp
Current humidity is 66%, one input that changes evaporative cooling.
Peak UV
7.4 at 1:00 pm
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
3°C hotter tomorrow
Today's forecast range is 15°C–17°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 Perth, Australia
Perth's dry summer heat and intense solar exposure can push sun-exposed WBGT above what shaded air temperature suggests. Compare the hourly modeled trend with Western Australia's official thermal-comfort observations before strenuous sport or outdoor work.
Forecasts describe outdoor conditions, not an individual's medical risk. Workload, duration, shade, clothing, acclimatization and health can change the appropriate decision.
Check Australian Bureau of Meteorology Western Australia thermal comfort observations ↗Nearby forecasts
Keep planning
Track Perth in HeatGuard
Save this location and get alerts as conditions change.