How this site works
Each island page gives a simple score out of 10 for the next morning and evening, so you can see your best time to run, walk, ride or swim at a glance.
The score
| Score | Means |
|---|---|
| 7–10 Go | Good conditions. Enjoy it. |
| 5–6 Take care | Fine with care: ease the pace, take water, check the tips. |
| 0–4 Skip it | Thunder, dangerous heat or rough seas. Choose another time or go indoors. |
Why this score lists what took points off, and the tiles that caused it are shaded on the card.
Time windows (local time on each island)
- Run & Ride: morning 4:30–7:00 AM, evening 4:30–6:30 PM.
- Swim: morning 5:30–8:00 AM (usually the calmest sea), evening 4:30–6:30 PM.
Run & Ride
Each window starts at 10 and loses points for heat, rain, thunderstorms, muggy heat, strong sun, gusty wind, wet roads after rain and poor air quality. Humidity only counts together with heat (80% from 28°C, 85% from 30°C), and humidity, dew point and heat stress share one penalty so they do not pile up. Thunderstorms or dangerous heat cap the score at 4. One score covers running, walking and riding.
Swim
Open water loses points for swell, rip-current risk, onshore wind, rain in the last 48 hours (runoff affects water quality) and very warm water. Thunder, seas over 1.5 m or a high rip risk cap it at 4. Pools lose points for thunder, heavy showers, heat on deck and strong sun.
Sea forecasts come from computer models. Always look at the water, and swim with a buddy.
Asthma and heart notes
When heat, humidity, air quality or Saharan dust could affect people with asthma or heart conditions, a separate note appears on the card. These notes never change the score. Follow your own doctor's advice.
Lightning watch
Live lightning is checked every 5 minutes from 4 AM to 9 PM (Jamaica time), currently around Jamaica only. Within 10 km it says to get indoors and wait 30 minutes after the last close strike; within 20 km, head back; within 40 km, keep watch. No detector catches every strike: if you hear thunder, you are close enough to be struck.
Updates
Forecasts are refreshed about four times a day: early morning before the first window, around midday, mid-afternoon before the evening window, and early evening for planning tomorrow. The time of the last update is shown next to "This week".
Islands
Jamaica, the Cayman Islands, Barbados, and Trinidad and Tobago each have their own page with their own places and local time. The links are at the bottom of every page.