Grant County, WA: Current UV Index and Hourly Forecast

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As of 12:11 PM PDT on May 22, 2026, all 25 cities in Grant County, WA in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Mattawa, WA with a reading of 7.

Over the next 24 hours, the highest UV Index reading in Grant County, WA is expected to be 7.4 in Mattawa between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Grant County, WA

• Banks Lake South - 6.2
• Beverly - 7
• Cascade Valley - 6.5
• Coulee City - 6.4
• Crescent Bar - 6.8
• Desert Aire - 7
• Electric City - 5.8
• Ephrata - 6.7
• George - 6.9
• Grand Coulee - 5.8
• Hartline - 6.1
• Krupp - 6.3
• Lakeview - 6.5
• Marine View - 6.8
• Mattawa - 7
• Moses Lake - 6.5
• Moses Lake North - 6.5
• Quincy - 6.7
• Royal City - 6.8
• Schwana - 7
• Soap Lake - 6.5
• Sunland Estates - 6.9
• Warden - 6.6
• Wheeler - 6.5
• Wilson Creek - 6.3