Jamestown UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index12
- Avg Clouds92%
- Max Temp20 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in Jamestown, Saint Helena, Ascension and Tristan da Cunha 
will reach a high of 12 today. This means a extreme level of sun exposure. See our tips below to stay safe!
Last checked: 2025-10-22
Hourly Forecast Chart
Today's Safety Tips
Extreme danger! Avoid being in the sun, especially during midday. If you go out, cover up with clothing, a hat, and sunglasses, and use plenty of sunscreen.
Jamestown's UV Index
The UV index in Jamestown, Saint Helena is generally low to moderate throughout the year, rarely reaching extreme levels. Ascension Island experiences moderate to high UV levels, especially in the summer months. Tristan da Cunha has a low UV index due to its latitude and cooler climate.
Weather Seasons
Saint Helena has mild temperatures year-round with little variation between seasons, experiencing more rainfall during the winter months. Ascension sees a hot, dry season and a cooler, wetter period, with more sunshine. Tristan da Cunha is cool and windy year-round with some rainfall, showing less distinct seasonal changes.
Jamestown's Climate
Compared to other parts of the South Atlantic, Saint Helena and Tristan da Cunha have cooler, more temperate climates than many tropical islands. Ascension Island is hotter and drier than the others. Neighboring countries like South Africa have more extreme temperature swings and less consistent rainfall than these islands.
Hourly UV Index Trend
See the UV index hour by hour for Jamestown. When the level is high, it's smart to find some shade.
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