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 13.1, indicating extreme risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
UV index at 13.1 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.
Read more here about the climate and sun exposure in and around Jamestown.
The UV index in Jamestown, a British Overseas Territory in Saint Helena, Ascension and Tristan da Cunha, can range from moderate to high throughout the year. In the summer (December to February), the UV index can reach levels of 8 (very high) during midday, which means that sun protection is crucial to avoid sunburn. In the other seasons, the UV index is slightly lower, ranging between 6 and 7 (high).
Jamestown experiences two main weather seasons: the wet season and the dry season. The wet season lasts from October to April, with December and January being the rainiest months. During this period, rainfall is quite common, and temperatures range from about 18 °C (64 °F) to 26 °C (79 °F). The dry season, on the other hand, occurs from May to September, with minimal rainfall and average temperatures ranging from 16 °C (61 °F) to 24 °C (75 °F).
Compared to its region, Jamestown receives a higher amount of sun exposure due to its location. Saint Helena is considered one of the sunniest places in the South Atlantic Ocean. The UV index in Jamestown is generally higher than in other parts of the region, making it important for residents and visitors to take precautions like wearing sunscreen, protective clothing, and sunglasses, especially during the summer months. It's crucial to stay hydrated and seek shade during the hottest times of the day when the sun's rays are strongest.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Jamestown. It's designed to provide you with a better understanding of the yearly weather and sun exposure.