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Coldest beach in California in September

404 coastal locations in California ranked by their typical September sea temperature. State-wide average in September: 16.9°C.

Coldest in September

Clear Lake

12.9°C

State September average

16.9°C

across 404 coastal locations in California

Vs annual mean

+2.4°C

above the year-round state average

What the California water feels like in September

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.

California monthly average 12.9°C to 16.9°C
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  • Warmest month September 16.9°C
  • Coldest month March 12.9°C
  • Annual mean 14.5°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the state pattern shown on the left. Browse a different month for a fresh ranking.

California sea temperature map (live)

Today's reading at every California beach we track. The list below uses the typical September mean from a decade of daily history.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 coldest California beaches in September

Sorted by typical September mean. Click any beach for the full location page.

# Location September mean
1 Blakes Landing, Tomales Bay California 15.1°C
2 Drakes Bay, Point Reyes California 15.1°C
3 Inverness, Tomales Bay California 15.1°C
4 Marshall, Tomales Bay California 15.1°C
5 Drakes Bay California 14.9°C
6 Inverness California 14.9°C
7 Point Reyes California 14.9°C
8 Tomales bay California 14.9°C
9 Mendocino, Mendocino Bay California 14.1°C
10 Noyo Harbor, Fort Bragg California 14.1°C
11 Noyo River California 14.1°C
12 Westport California 14.0°C
13 Fort Bragg California 13.7°C
14 Glass Beach California 13.7°C
15 Mendocino California 13.7°C
16 Bodega Bay California 13.7°C
17 Jenner California 13.7°C
18 Salmon Creek California 13.7°C
19 Trinidad Harbor California 13.6°C
20 Shelter Cove California 13.5°C
21 Pyramid Point, Smith River California 13.5°C
22 Requa Dock California 13.5°C
23 Arcata Wharf, Humboldt Bay California 13.5°C
24 Bucksport, Humboldt Bay California 13.5°C
25 Elk River Railroad Bridge, Humboldt Bay California 13.5°C
Show 25 more ▸
26 Eureka, Humboldt Bay California 13.5°C
27 Eureka Slough Bridge, Humboldt Bay California 13.5°C
28 Fields Landing, Humboldt Bay California 13.5°C
29 Hookton Slough, Humboldt Bay California 13.5°C
30 Mad River Slough, Arcata Bay, Humboldt Bay California 13.5°C
31 North Spit, Humboldt Bay California 13.5°C
32 Samoa, Humboldt Bay California 13.5°C
33 Shasta Lake California 13.5°C
34 Bayview California 13.4°C
35 Eureka California 13.4°C
36 Trinidad California 13.4°C
37 Bodega Harbor entrance California 13.4°C
38 Fort Ross California 13.4°C
39 Cockrobin Island Bridge, Eel River, San Francisco California 13.4°C
40 King Salmon California 13.3°C
41 Crescent City California 13.3°C
42 Sea Ranch California 13.2°C
43 Dillon Beach California 13.2°C
44 Lake Almanor California 13.2°C
45 Arena Cove California 13.2°C
46 Point Arena California 13.2°C
47 Green Cove California 12.9°C
48 Clear Lake California 12.9°C
49 Lake Sonoma California 12.9°C
50 Lakeport California 12.9°C

Warmest 10 in California in September

Same data flipped. The warmest spots in the state for this month.

# Location September mean
1 Baby Beach California 21.7°C
2 Capistrano Beach California 21.7°C
3 Dana Point California 21.7°C
4 Doheny Beach California 21.7°C
5 Salt Creek Beach California 21.7°C
6 San Clemente California 21.7°C
7 San Onofre Beach California 21.7°C
8 Trestles Beach California 21.7°C
9 Black's Beach California 21.6°C
10 Del Mar California 21.6°C

Other US states

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