Historic Record in Haapsalu: Estonia Measures Highest UV Index Ever

Estonia experienced an unprecedented surge in ultraviolet (UV) radiation levels at the end of June, with Haapsalu registering an absolute national record of 8.9 on the UV index on June 25, 2026. On the same day, Pärnu recorded a new peak of 7.7, according to reports.

Scientist Margit Aun explained that such exceptionally high UV values result from a confluence of specific atmospheric conditions. These include reflection from light clouds, an unusually clean air mass, and a notably thin ozone layer. This combination amplified the intensity of solar radiation reaching the surface.

The extreme UV index poses significant health risks, primarily to skin and eyes. Health authorities typically advise limiting sun exposure during peak hours, seeking shade, wearing protective clothing, hats, and sunglasses, and using sunscreen with a high SPF when UV levels are this high. The records set in Haapsalu and Pärnu underscore the importance of monitoring and adhering to UV safety guidelines, even in regions not typically associated with extreme solar radiation.

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According to scientist Margit Aun, such high UV values arise from the coincidence of several factors, such as reflection from light clouds, exceptionally clean air, and a thin ozone layer.