UV Index
UV Index
Today's UV index in Longueuil, Canada 
will be up to 7, indicating a high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-21
With Longueuil's UV index reaching 7, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours, especially between 10 a.m. and 4 p.m. when UV rays are strongest.
The UV index in Longueuil varies throughout the year, generally low in winter months and highest in summer, often reaching moderate to high levels around June and July. Seasonal patterns show cold, snowy winters with temperatures often below freezing, and warm, humid summers with temperatures typically in the 20s Celsius. Compared to other parts of Canada, Longueuil has milder winters than northern regions but colder than coastal areas. It shares similar weather patterns with nearby Montreal and has colder winters than southern U.S. cities but warmer summers than some northern Canadian areas.
See the UV index hour by hour for Longueuil, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.