Mercer County, NJ: Current UV Index and Hourly Forecast

As of 4:13 PM EDT on July 22, 2025, out of 17 cities in Mercer County, NJ in our database, 11 cities (65%) have a UV Index reading of Low, while 6 cities (35%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Hopewell, NJ with a reading of 4.2.

Over the next 24 hours, the highest UV Index reading in Mercer County, NJ is expected to be 9.3 in Trenton between 1:00 PM - 2:00 PM EDT tomorrow.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Mercer County, NJ as of 4:13 PM EDT, July 22, 2025

Current UV Index in Cities in Mercer County, NJ

4:13 PM EDT, July 22, 2025