Mercer County, NJ: Current UV Index and Hourly Forecast

• USA →
• New Jersey →
• Mercer County

As of 9:33 PM EDT on July 1, 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 9 in Twin Rivers between 12:00 PM - 1:00 PM EDT tomorrow.

Search Cities in Mercer County, NJ

Current UV Index in Cities in Mercer County, NJ

• Groveville - 0
• Hamilton Square - 0
• Hightstown - 0
• Hopewell - 0
• Lawrenceville - 0
• Mercerville - 0
• Pennington - 0
• Princeton - 0
• Princeton Junction - 0
• The College of New Jersey - 0
• Titusville - 0
• Trenton - 0
• Twin Rivers - 0
• Washington Crossing - 0
• White Horse - 0
• Windsor - 0
• Yardville - 0