UV Index
UV Index
Today's UV index in Markham, Canada 
will be up to 7.2, 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: 2025-05-09
With Markham's UV index reaching 7.2, 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 Markham, Canada, varies throughout the year, typically reaching moderate levels in spring and fall and higher levels during summer months. In winter, the UV index is low due to less sunlight. The city experiences four distinct seasons: cold, snowy winters; warm, humid summers; and mild, often rainy spring and autumn. Snowfall is common in winter, while summer can bring thunderstorms. Daylight hours change significantly, with longer days in summer and shorter in winter. Markham's weather is influenced by its location in southern Ontario, near Lake Ontario. Compared to other parts of Canada, Markham has milder winters than northern regions but colder than coastal areas. It experiences more humidity and precipitation than western provinces. Neighboring cities like Toronto have very similar weather patterns due to their proximity.
See the UV index hour by hour for Markham, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.