UV index today  UV Index

UV Index in Jamestown, SH

UV index


Cloud cover



00.0 ℃


Today's UV index in Jamestown, Saint Helena, Ascension and Tristan da Cunha 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.


Today's tips

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.

Jamestown Weather

Read more here about the climate and sun exposure in and around Jamestown.

UV Index in 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).

Weather Seasons

UV index

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).

Jamestown's Climate

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.

Annual Sun Radiation

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.


* This page's content about the UV index in Jamestown (Saint Helena, Ascension and Tristan da Cunha) is for educational and informational purposes only. The developers and data providers are not liable for the accuracy, reliability, or availability of the information. The information is not a substitute for professional medical advice, and the developers and data providers are not medical professionals. Seek advice from a qualified health provider for any medical concerns, and do not disregard medical advice or delay seeking it based on the information provided on this site.