UV Index
UV Index
Today's UV index in Portsmouth, United Kingdom 
will be up to 5.4, indicating a moderate level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-10
With a UV index reaching up to 5.4 in Portsmouth, 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.
The UV index in Portsmouth is usually low to moderate, ranging from 1 to 5 throughout the year, with higher values in summer months like June and July, often peaking around 5. Portsmouth's weather follows typical UK seasonal patterns: cool, wet winters and mild, sometimes rainy summers. Spring and autumn are transitional with moderate temperatures and variable rainfall. Winters can be chilly but not extreme, while summers remain relatively mild compared to hotter countries. Compared to other parts of the UK, Portsmouth is milder due to its coastal location, often experiencing less temperature variation. Neighboring countries like France and Belgium nearby generally have similar weather but can be slightly warmer or sunnier in summer.
See the UV index hour by hour for Portsmouth, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.