Grant County, WA: Current UV Index and Hourly Forecast

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As of 2:29 PM PDT on June 11, 2026, all 25 cities in Grant County, WA in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Mattawa, WA with a reading of 7.9.

Over the next 24 hours, the highest UV Index reading in Grant County, WA is expected to be 8.2 in Mattawa between 1:00 PM - 2:00 PM PDT tomorrow.

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Current UV Index in Cities in Grant County, WA

• Banks Lake South - 7.7
• Beverly - 7.9
• Cascade Valley - 7.7
• Coulee City - 7.7
• Crescent Bar - 7.8
• Desert Aire - 7.9
• Electric City - 7.5
• Ephrata - 7.8
• George - 7.8
• Grand Coulee - 7.5
• Hartline - 7.7
• Krupp - 7.7
• Lakeview - 7.8
• Marine View - 7.7
• Mattawa - 7.9
• Moses Lake - 7.7
• Moses Lake North - 7.7
• Quincy - 7.8
• Royal City - 7.7
• Schwana - 7.9
• Soap Lake - 7.8
• Sunland Estates - 7.9
• Warden - 7.7
• Wheeler - 7.7
• Wilson Creek - 7.7