Saudi Heat Index & Activity Safety

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Wet-bulb temperature is the critical metric: how much your body can cool by sweating. Above 32°C wet-bulb, even resting outdoors can cause heat stroke.
The Saudi General Directorate of Civil Defence uses a 2-hour outdoor work limit at high heat.
Heat stroke signs: confusion, slurred speech, hot body, no sweat. Call 997 immediately.

• Real wet-bulb requires humidity data; this tool uses typical averages. Humidity above 60% in coastal cities raises risk dramatically.

• Personal factors (medications, alcohol the night before, dehydration) amplify risk beyond this.

Is sunset safe?

Generally yes for coastal cities (humidity falls). Inland desert the air stays hot for 1–2 hours after sunset.

What about AC?

All Saudi buildings (including tourist sites) are heavily AC'd. Plan to retreat every 60–90 minutes in extreme heat.