Butler County, PA: Current UV Index and Hourly Forecast

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As of 4:44 PM EDT on May 22, 2026, all 32 cities in Butler County, PA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Eau Claire, PA with a reading of 2.

Over the next 24 hours, the highest UV Index reading in Butler County, PA is expected to be 5.5 in Zelienople between 3:00 PM - 4:00 PM EDT tomorrow.

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Current UV Index in Cities in Butler County, PA

• Bruin - 1.8
• Butler - 1.4
• Callery - 1.4
• Cherry Valley - 2
• Chicora - 1.8
• East Butler - 1.8
• Eau Claire - 2
• Evans City - 1.4
• Fairview - 1.8
• Harmony - 1.4
• Harrisville - 1.9
• Homeacre-Lyndora - 1.4
• Karns City - 1.8
• Lake Arthur Estates - 1
• Mars - 1.4
• Meadowood - 1.4
• Meridian - 1.4
• Nixon - 1.4
• Oak Hills - 1.4
• Petrolia - 1.8
• Portersville - 1
• Prospect - 1.3
• Saxonburg - 1.3
• Seven Fields - 1.4
• Shanor-Northvue - 1.3
• Slippery Rock - 1.3
• Slippery Rock University - 1.3
• Unionville - 1.3
• Valencia - 1.4
• West Liberty - 1.3
• West Sunbury - 1.3
• Zelienople - 1.5