UV Index
UV Index
Today's UV index in Ottawa, Canada 
will be up to 6.5, 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: 2025-05-10
With Ottawa's UV index reaching 6.5, 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.
Ottawa's UV index varies seasonally, reaching its highest levels in summer, typically around 6 to 7, and dropping to very low levels, close to 0, during winter months. Seasonal patterns in Ottawa show cold, snowy winters with temperatures often below freezing and warm, humid summers with temperatures ranging from 20 to 30°C. Compared to other Canadian cities, Ottawa experiences more pronounced seasonal changes. It tends to have colder winters than cities like Toronto but milder winters than places further north. Neighboring cities in Quebec have similar weather patterns.
See the UV index hour by hour for Ottawa, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.