With a UV index reaching up to 4.5 in Kathmandu, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
Read more here about the climate and sun exposure in and around Kathmandu.
The UV index in Kathmandu, Nepal varies throughout the year, reaching its highest levels in April and May. During these months, the UV index can often reach 10 or even higher, which is considered very high. It is important to take precautions such as wearing sunglasses, using sunscreen, and seeking shade during the peak UV hours of 10 am to 4 pm to protect against the harmful effects of the sun.
Kathmandu experiences four distinct seasons: spring, summer, autumn, and winter. Spring (March to May) brings mild temperatures, with average highs around 25 °C (77 °F) and lows around 10 °C (50 °F). Summer (June to August) is hot and humid, with temperatures rising to 30 °C (86 °F) or more. Autumn (September to November) is considered the best time to visit Kathmandu, with pleasant temperatures ranging from 20 °C (68 °F) to 25 °C (77 °F). Winter (December to February) can be chilly, with average highs around 12 °C (54 °F) and lows dropping to 2 °C (36 °F) or below.
Compared to other regions, Kathmandu experiences relatively high sun exposure due to its location in the Himalayas. The city is closer to the equator, resulting in higher solar radiation. Altitude also plays a role, as the thinner atmosphere at higher elevations allows more UV radiation to reach the surface. It is important for residents and visitors to be aware of these factors and take appropriate measures to protect themselves from the sun's harmful rays.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Kathmandu. It's designed to provide you with a better understanding of the yearly weather and sun exposure.