UV Index
UV Index
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Today's UV index in Jamestown, Saint Helena, Ascension and Tristan da Cunha 
will be up to 12.9, indicating a extreme level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
UV index at 12.9 in Jamestown means extreme risk; limit outdoor time from 10 a.m. to 4 p.m., use shade, protective clothing, SPF 30+ sunscreen, and sunglasses; watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Jamestown, Saint Helena typically ranges from low to moderate, with values rarely exceeding 6.
Jamestown has a tropical climate with two main seasons: the warm, wet season from January to April, and the cool, dry season from May to October.
Compared to its region and neighboring countries, Jamestown has a unique climate with milder temperatures and more consistent rainfall than other islands in the South Atlantic. It receives less rainfall and has cooler temperatures than nearby countries in tropical Africa.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Jamestown. It's designed to provide you with a better understanding of the yearly weather and sun exposure.