As of 1:59 PM MDT on April 1, 2025, out of 18 cities in Lewis and Clark County, MT in our database, 17 cities (94%) have a UV Index reading of Moderate, while 1 city (6%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Helena Valley West Central, MT with a reading of 3.5.
Over the next 24 hours, the highest UV Index reading in Lewis and Clark County, MT is expected to be 4.3 in Augusta between 12:00 PM - 1:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |