UV Index
UV Index
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Today's UV index in Washington, D.C., United States 
will be up to 4.7, 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 4.7 in Washington, D.C., 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 Washington, D.C. can reach a high of 9 during summer months, while in winter it averages around 2. This variation is due to the city's humid subtropical climate.
Washington, D.C. experiences four distinct seasons. Spring brings pleasant temperatures and blooming cherry blossoms. Summers are hot and humid, with temperatures often exceeding 32°C. Autumn sees cooler weather and vibrant fall foliage. Winters are cold, with occasional snowfall.
Compared to its region and neighboring countries, Washington, D.C.'s weather is mild. The city is warmer than northern states in the US during winter, but cooler than southern states. It's also warmer than cities in southern Canada during summer months, but cooler than many cities in Mexico.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Washington, D.C.. It's designed to provide you with a better understanding of the yearly weather and sun exposure.