Mercer County, NJ: Current UV Index and Hourly Forecast

As of 12:10 AM EDT on September 3, 2025, all 17 cities in Mercer County, NJ in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in Mercer County, NJ is expected to be 7 in Hopewell between 1:00 PM - 2:00 PM EDT today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Mercer County, NJ as of 12:10 AM EDT, September 3, 2025

Current UV Index in Cities in Mercer County, NJ

12:10 AM EDT, September 3, 2025