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Inverness, Tomales Bay Sea Temperature in September

California, United States

August Inverness, Tomales Bay year-round → October

Average sea temperature for Inverness, Tomales Bay, United States across September, based on 10 years of daily readings.

Average

15.08° C

High

16.39° C

Low

13.17° C

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

September is the 1st warmest of 12 months at Inverness, Tomales Bay. On average the water sits 2.2° than the year-round mean of 12.88° C.

Compared to August, September is 0.5° warmer than (14.59° C in August). By October the water is usually 14.35° C.

Inverness, Tomales Bay Day-by-Day Water Temperature in September

10-year low, average and high

12.5° C
13.6° C
14.8° C
15.9° C
17.0° 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 Inverness, Tomales Bay.

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 Inverness, Tomales Bay

10-year daily averages

Day Average Low High
September 1 15.14° C 14.13° C 15.95° C
September 2 15.09° C 14.26° C 15.76° C
September 3 15.12° C 13.69° C 15.86° C
September 4 15.09° C 13.54° C 15.85° C
September 5 15° C 13.82° C 15.68° C
September 6 15.15° C 13.96° C 15.82° C
September 7 15.22° C 14.53° C 15.91° C
September 8 15.12° C 14.26° C 16.13° C
September 9 14.99° C 13.84° C 16.18° C
September 10 14.82° C 13.57° C 16.09° C
September 11 14.86° C 13.43° C 16.28° C
September 12 14.84° C 13.95° C 16.17° C
September 13 14.75° C 14.06° C 15.92° C
September 14 14.76° C 13.88° C 15.85° C
September 15 14.85° C 13.5° C 15.95° C
September 16 14.91° C 13.27° C 16.21° C
September 17 14.93° C 13.29° C 16.28° C
September 18 15.07° C 13.77° C 16.3° C
September 19 15.12° C 13.54° C 16.39° C
September 20 15.21° C 13.64° C 16.28° C
September 21 15.3° C 13.97° C 16.14° C
September 22 15.28° C 14.44° C 15.91° C
September 23 15.38° C 14.78° C 16.03° C
September 24 15.49° C 14.84° C 16.09° C
September 25 15.54° C 14.71° C 16.32° C
September 26 15.43° C 14.31° C 16.2° C
September 27 15.28° C 13.87° C 16.21° C
September 28 15.16° C 14.13° C 16.38° C
September 29 14.78° C 13.31° C 16.05° C
September 30 14.64° C 13.17° C 16.05° C

Where September Sits in the Year

September highlighted

8.0° C
10.6° C
13.3° C
15.9° C
18.5° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
12.12° C
12.05° C
11.75° C
11.67° C
11.44° C
12.47° C
13.59° C
14.59° C
15.08° C
14.35° C
13.11° C
12.3° C
10-year monthly history for Inverness, Tomales Bay. 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

Inverness, Tomales Bay Location

38.1133, -122.8680

38.11330, -122.86800 View on OpenStreetMap →

Inverness, Tomales Bay sits at 38.1133°N, 122.8680°W, on the coast of California, 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 Inverness, Tomales Bay