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Johnson Keys, north end, Florida Sea Temperature in September

Florida, United States

August Johnson Keys, north end, Florida year-round → October

Average sea temperature for Johnson Keys, north end, Florida, United States across September, based on 10 years of daily readings.

Average

30.22° C

High

31.54° C

Low

27.65° C

Water at this temperature is very warm and you should look to bathe only. Avoid any kind of strenuous swimming as there is a real risk of heat stroke at this temperature.

September is the 3rd warmest of 12 months at Johnson Keys, north end, Florida. On average the water sits 3.5° than the year-round mean of 26.75° C.

Compared to August, September is 0.7° cooler than (30.87° C in August). By October the water is usually 28.36° C.

Johnson Keys, north end, Florida Day-by-Day Water Temperature in September

10-year low, average and high

27.0° C
28.4° C
29.8° C
31.1° C
32.5° C
1
5
10
15
20
25
30
Day-by-day low and high band with the 10-year daily average through September. Range Average

Each vertical bar above is one day of September. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Johnson Keys, north end, Florida.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

September Water Temperature Table for Johnson Keys, north end, Florida

10-year daily averages

Day Average Low High
September 1 30.47° C 29.8° C 31.13° C
September 2 30.47° C 29.78° C 31.22° C
September 3 30.47° C 29.84° C 31.1° C
September 4 30.5° C 29.85° C 31.06° C
September 5 30.41° C 29.68° C 31.07° C
September 6 30.37° C 29.77° C 31.02° C
September 7 30.4° C 29.94° C 31.15° C
September 8 30.45° C 29.94° C 31.11° C
September 9 30.52° C 30.12° C 30.9° C
September 10 30.52° C 30.19° C 30.86° C
September 11 30.52° C 29.82° C 30.93° C
September 12 30.49° C 29.4° C 31.02° C
September 13 30.53° C 29.29° C 31.18° C
September 14 30.49° C 29.11° C 31.4° C
September 15 30.46° C 29.39° C 31.46° C
September 16 30.49° C 29.67° C 31.54° C
September 17 30.39° C 29.52° C 31.53° C
September 18 30.27° C 29.55° C 31.39° C
September 19 30.21° C 29.36° C 31.35° C
September 20 30.11° C 28.73° C 31.3° C
September 21 30.05° C 28.54° C 31.06° C
September 22 29.95° C 28.16° C 30.95° C
September 23 29.93° C 27.94° C 30.91° C
September 24 29.9° C 27.76° C 30.87° C
September 25 29.89° C 27.65° C 30.86° C
September 26 29.87° C 27.75° C 30.69° C
September 27 29.8° C 27.68° C 30.66° C
September 28 29.63° C 27.8° C 30.38° C
September 29 29.56° C 28.04° C 30.22° C
September 30 29.45° C 27.99° C 30.04° C

Where September Sits in the Year

September highlighted

15.0° C
20.1° C
25.3° C
30.4° C
35.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
21.78° C
22.25° C
24.26° C
25.93° C
28.17° C
29.45° C
30.62° C
30.87° C
30.22° C
28.36° C
25.72° C
23.42° C
10-year monthly history for Johnson Keys, north end, Florida. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in September

Compare other United States water for the same month

Johnson Keys, north end, Florida Location

24.7667, -81.3233

24.76670, -81.32330 View on OpenStreetMap →

Johnson Keys, north end, Florida sits at 24.7667°N, 81.3233°W, on the coast of Florida, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Johnson Keys, north end, Florida