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Wind & Coastal Weather Wellness Risk Checker
Enter the conditions at the coast and get an overall safety level for outdoor activity, with a separate assessment for each factor so you can see exactly what is driving the result.
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How it works
The heat index is calculated with the Rothfusz formula, which combines air temperature and relative humidity into a "feels like" temperature. In Fahrenheit, the formula is: −42.379 + 2.04901523T + 10.14333127R − 0.22475541TR − 0.00683783T² − 0.05481717R² + 0.00122874T²R + 0.00085282TR² − 0.00000199T²R², where T is temperature in Fahrenheit and R is relative humidity in percent. The standard low-humidity and high-humidity adjustments are applied where they belong, and the result is shown in both Celsius and Fahrenheit.
Each factor is then rated on its own. Heat index: below 28°C is Safe, 28–35°C is Caution, above 35°C is Avoid. Humidity: below 60% is Safe, 60–80% is Caution, above 80% is Caution with a stronger warning, because very humid air slows sweat evaporation and makes the heat index worse. Wind: below 20 km/h is Safe, 20–40 km/h is Caution (blowing sand, choppy water, harder balance), above 40 km/h is Avoid. UV: below 3 is Safe, 3–7 is Caution, 8 or above is Avoid for unprotected outdoor activity.
The overall level is simply the worst of the four factor ratings. That is deliberate: a single dangerous factor should not be averaged away by three comfortable ones. A hot, humid day with a gentle breeze can still be Avoid if the heat index is extreme, and a cool but very windy day can still be Avoid if the wind alone makes activity unsafe.
How to use your result
Safe means conditions suit normal outdoor activity, with the usual water, shade, and sun protection. Caution means shorten the session, stay near shade and water, slow down, and watch for dizziness, nausea, or unusual fatigue. Avoid means postpone hard outdoor activity, move it indoors or to a cooler, calmer time of day, and do not let a single comfortable factor overrule the warning. If anyone shows signs of heat illness — confusion, vomiting, hot dry skin, or fainting — stop activity, move to shade, cool them, and seek urgent help.
Related guides
- Exercising Safely in Coastal Wind and Humidity
- Reading a Beach Weather Forecast for Workouts
- Heat, Humidity and Wind: How They Affect Performance
Please note: this tool gives general information only, not medical advice. If you have a medical condition, talk to a clinician before changing your activity, sun exposure, fluids, or sleep routine.