UV Index
UV Index
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Today's UV index in Ottawa, Canada 
will be up to 4.6, indicating a moderate level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 4.6 in Ottawa, 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 Ottawa, Canada can reach high levels during the summer months, with a maximum index of 9. In the winter, the UV index is much lower, usually staying below 2.
Ottawa has four distinct seasons. Spring brings mild temperatures and blooming flowers, while summer is warm with occasional heatwaves. Autumn sees falling leaves and cooler weather, and winter is cold with snow and ice, often leading to below freezing temperatures.
Compared to its region and neighboring countries, Ottawa's weather is relatively mild. While nearby cities in northern Canada experience extremely cold winters, Ottawa's winters are moderated by its southern location and proximity to the Great Lakes. Similarly, Ottawa's summers are cooler than many cities in the United States and southern Canada.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Ottawa. It's designed to provide you with a better understanding of the yearly weather and sun exposure.