Phoenix Heat Index Today
Updated planning preview · 2:00 PM forecast from WeatherAPI
Heat index
117°F
Very high
Reschedule strenuous activity when possible.
Temperature
112°F
Humidity
21%
Estimated WBGT
33.3°C
UV index
8.4
Best outdoor window
6:00 AM–10:00 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 |
|---|---|---|---|---|---|
| 2 PM | 112°F | 117°F | 33.3°C | 8.4 | Very high |
| 4 PM | 114°F | 121°F | 33.3°C | 3.5 | Very high |
| 6 PM | 111°F | 114°F | 30.4°C | 0.4 | Very high |
| 6 AM | 91°F | 90°F | 26.1°C | 0.0 | High |
| 8 AM | 93°F | 92°F | 26.5°C | 1.5 | High |
| 10 AM | 96°F | 95°F | 27.2°C | 6.3 | High |
| 12 PM | 100°F | 99°F | 28.4°C | 10.2 | High |
| 2 PM | 105°F | 105°F | 29.2°C | 8.7 | Very high |
Today's outlook
In Phoenix, the highest modeled heat burden in this preview occurs around 2:00 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 122°F
115° / 79°
Very highFriday
Heat index up to 109°F
107° / 89°
Very highSaturday
Heat index up to 109°F
107° / 92°
Very highToday in Phoenix
What changes across the day
Based on the available hourly WeatherAPI forecast
Peak heat index
121°F at 4:00 PM
The preview low is 90°F around 6:00 AM.
Feels-like difference
5°F above air temp
Current humidity is 21%, one input that changes evaporative cooling.
Peak UV
10.2 at 12:00 PM
UV and heat are separate hazards; the lowest-heat hour may still need sun protection.
Tomorrow's direction
13°F cooler tomorrow
Today's forecast range is 79–115°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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