Union County, NJ: Current UV Index and Hourly Forecast

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As of 12:07 PM EDT on October 12, 2026, all 19 cities in Union County, NJ in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Rahway, NJ with a reading of 4.1.

Over the next 24 hours, the highest UV Index reading in Union County, NJ is expected to be 4.5 in Plainfield between 1:00 PM - 2:00 PM EDT today.

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Current UV Index in Cities in Union County, NJ

• Connecticut Farms - 4
• Cranford - 4
• Elizabeth - 4
• Fanwood - 4.1
• Garwood - 4
• Kean University - 4
• Kenilworth - 4
• Linden - 4
• Mountainside - 4
• New Providence - 4.1
• Plainfield - 4
• Rahway - 4.1
• Roselle - 4
• Roselle Park - 4
• Springfield - 4
• Summit - 4
• Union - 4
• Vauxhall - 4
• Westfield - 4