Buresh Blog: King tides... 90 degree days... November averages

This blog is written & updated weekly by *me* - Mike Buresh.

See & read updates on the tropics every day during the Atlantic hurricane season at “Talking the Tropics With Mike”.

The annual king tides have been especially high this month (Oct.) during the full moon. The higher than average tides were greatly augmented by strong onshore flow (winds out of the northeast) - “local” nor’easter conditions caused by strong high pressure to the north & lower pressure to the south.

King tides are an annual natural phenomenon that occur in Sept./Oct./Nov. when the earth, moon & sun are aligned (new/full moon cycles) at a time when the moon is in perigee (closest to the earth but still 226,434 miles away). The next 2 cycles will be with the Nov. new moon from the 7th - 9th & the full moon from the 23rd - 27th.

High tides near the Mayport Jetties:

It looks like we’re done with 90-degree days for the year as Jacksonville has never had a high temp. of 90+ beyond Halloween. We’ll end the year with 109 90-degree days - well above the average of 82 90-degree days & 4th most in a year on the all-time list. The last 3 years have all had more than 100 90-degree days (2024 - 102 days, 2025 - 113 days).

November averages for Jacksonville (the driest month of the year on average [had zero rainfall last year]):