Harris County, TX: Current UV Index and Hourly Forecast

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As of 3:27 PM CDT on May 20, 2026, out of 37 cities in Harris County, TX in our database, 22 cities (59%) have a UV Index reading of Moderate, 14 cities (38%) have a UV Index reading of Low, while 1 city (3%) have a UV Index reading of High. The city with the highest UV Index reading right now is Katy, TX with a reading of 7.3.

Over the next 24 hours, the highest UV Index reading in Harris County, TX is expected to be 7.3 in Katy between 3:00 PM - 4:00 PM CDT today.

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Current UV Index in Cities in Harris County, TX

• Aldine - 3.9
• Atascocita - 1.5
• Barrett - 2.7
• Baytown - 2.7
• Bellaire - 4.6
• Bunker Hill Village - 4.6
• Channelview - 2.7
• Cloverleaf - 1
• Crosby - 4.5
• Deer Park - 2.7
• El Lago - 1.1
• Galena Park - 1
• Hedwig Village - 4.6
• Highlands - 2.7
• Hilshire Village - 4.6
• Houston - 4.6
• Humble - 1.5
• Hunters Creek Village - 4.6
• Jacinto City - 1
• Jersey Village - 3.9
• Katy - 7.3
• La Porte - 2.7
• Morgan's Point - 2.7
• Nassau Bay - 1.1
• Pasadena - 1
• Piney Point Village - 4.6
• Seabrook - 1.1
• Sheldon - 1
• Shoreacres - 1.1
• South Houston - 1
• Southside Place - 4.6
• Spring - 3.9
• Spring Valley Village - 4.6
• Taylor Lake Village - 1.1
• Tomball - 3.9
• Webster - 1.1
• West University Place - 4.6