UV Index in Saint John, United States

Last updated: August 1, 2025

In Saint John, United States, staying informed about the UV Index is crucial for safeguarding your skin and overall health. Understanding UV levels not only helps in preventing painful sunburns but also plays a vital role in reducing the long-term risks associated with skin damage and conditions such as skin cancer. With its Cfa climate presenting opportunities for outdoor activities, residents and visitors must remain vigilant about peak UV exposure times, especially when the index can soar to 11 between noon and early afternoon. Keep your eyes on the UV Index to enjoy the sun safely and protect your skin with the proper precautions!

Hourly UV Index in Saint John

At sunrise, the UV Index starts at a gentle 1 by 07:00, perfect for early risers enjoying the morning light. As the day progresses, it gradually climbs, reaching a moderate 3 by 09:00 and peaking at an intense 11 around 13:00 and 14:00. During these midday hours, the sun's rays are at their most powerful, making it crucial to seek shade or wear protective gear. Post-peak, the index begins to decline, descending to 5 by 17:00 and tapering off to 1 again by 19:00. This dynamic pattern highlights the importance of staying vigilant about sun protection, especially during peak hours!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:001low45 min
09:002low45 min
10:004moderate30 min
11:007high25 min
12:009very high15 min
13:0010very high15 min
14:0010very high15 min
15:009very high15 min
16:007high25 min
17:004moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Saint John

Throughout the year, UV levels fluctuate significantly, with the highest risk months occurring from April to August. During these months, particularly in June and July, the UV Index peaks at 11, falling into the extreme exposure category, where burn time is just 10 minutes. As a result, it's crucial for visitors and residents to take protective measures, such as wearing sunscreen, protective clothing, and seeking shade during peak hours. Notably, even in the spring months of March (UV Index 7) and April (UV Index 9), the risk is elevated, with burn times decreasing to 25 minutes and 15 minutes respectively. Conversely, the winter months of January (UV Index 4) through March present a moderate risk, allowing for longer exposure times of up to 30 minutes. Overall, awareness and protection against UV radiation are essential, especially during the high-risk season.

Monthly Maximum UV Index for Saint John, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Saint John. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec4579101111109753
Data source: Statistical UV Index data for Saint John, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare Saint John UV Index with Other United States Cities

The table above highlights how UV exposure in Saint John compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Saint John's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Saint John4579101111109753
Los Angeles UVI46891011111010754
Houston UVI589111112121110975