Key Biscayne temperatures will drop into the mid-60s Friday night, Nov. 13, after a cold front pushes through South Florida.

The National Weather Service point forecast for Key Biscayne calls for a Friday night low around 65°F and a Saturday night low around 69°F. Saturday's high tops out near 74°F, with mostly sunny skies and north winds of 13 to 18 mph gusting to 21 mph.

NBC Miami meteorologist Ryan Phillips forecast highs of 84°F on Wednesday and 85°F on Thursday before the front arrives. Friday's high drops to 79°F on the NWS Key Biscayne forecast.

Inland South Florida will feel the chill more. Phillips forecast overnight lows of 59°F Friday night into Saturday and 61°F Saturday night into Sunday. Key Biscayne Portal reported that the NWS expects Miami lows of 59°F Friday night into Saturday morning and 57°F Saturday night into Sunday morning.

The NWS Key Biscayne forecast shows lows of 65°F and 69°F for the same nights. That is 6 to 12 degrees warmer than the inland Miami figures, consistent with the island's coastal position.

Health risks

The Key Biscayne Portal reported that sudden temperature swings can affect older adults, young children, asthma patients and people with cardiovascular conditions. Cold air can irritate airways, worsen lung problems and raise blood pressure, the outlet reported. The outlet said weather authorities recommend dressing in layers, limiting time outdoors in the wind and protecting children, older adults and pets.

Key Biscayne weekend forecast

  • Friday, Nov. 13: High near 79°F, mostly cloudy, northwest wind around 10 mph.
  • Friday night: Low around 65°F, partly cloudy, breezy with north wind gusts to 21 mph.
  • Saturday, Nov. 14: High near 74°F, mostly sunny, breezy with gusts to 21 mph.
  • Saturday night: Low around 69°F, partly cloudy, northeast wind around 15 mph.
  • Sunday, Nov. 15: High near 79°F, partly sunny, breezy with gusts to 22 mph.

NBC Miami forecast a wetter pattern returning early next week.