Peak UV index by city
| City | Population | Peak UV | Exposure | UV 3+ hours |
|---|---|---|---|---|
| Fargo | 136,275 | 1 | Low | Below 3 all day |
| Bismarck | 77,963 | 2 | Low | Below 3 all day |
| Grand Forks | 60,365 | 1 | Low | Below 3 all day |
| Minot | 47,308 | 2 | Low | Below 3 all day |
| West Fargo | 41,175 | 1 | Low | Below 3 all day |
| Williston | 29,522 | 2 | Low | Below 3 all day |
| Dickinson | 25,870 | 2 | Low | Below 3 all day |
| Mandan | 25,061 | 2 | Low | Below 3 all day |
UV 3+ hours show the window from the first forecast hour at 3 or above to the end of the last. The EPA recommends sun protection at UV 3 and above. Open a city for its current-hour forecast and hourly chart. Forecast sources and limitations.
North Dakota water temperatures · North Dakota frost dates · Other states