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Warmest 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.

Warmest in September

Baby Beach

21.7°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 warmest California beaches in September

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

# 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
11 La Jolla Cove California 21.6°C
12 La Jolla Shores California 21.6°C
13 La Jolla California 21.6°C
14 Mission Beach California 21.6°C
15 Scripps Pier California 21.6°C
16 Solana Beach California 21.6°C
17 La Jolla (Scripps Institution Wharf) California 21.6°C
18 Cardiff California 21.5°C
19 Carlsbad California 21.5°C
20 Encinitas California 21.5°C
21 Moonlight Beach California 21.5°C
22 Oceanside California 21.5°C
23 Big Bear Lake California 21.5°C
24 Laguna Niguel California 21.5°C
25 Lake Arrowhead California 21.5°C
Show 25 more ▸
26 Balboa Island California 21.3°C
27 Corona Del Mar California 21.3°C
28 Crystal Cove California 21.3°C
29 Huntington Beach California 21.3°C
30 Irvine California 21.3°C
31 Laguna Beach California 21.3°C
32 Newport Beach California 21.3°C
33 Orange County California 21.3°C
34 Bolsa Chica California 21.2°C
35 Seal Beach California 21.2°C
36 Sunset Beach California 21.2°C
37 San Clemente Island California 21.1°C
38 Avalon, Santa Catalina Island California 21.1°C
39 Catalina Harbor, Santa Catalina Island California 20.9°C
40 Fontana California 20.9°C
41 Alamitos Bay California 20.9°C
42 Long Beach California 20.9°C
43 Balboa Pier, Newport Beach California 20.9°C
44 Newport Beach, Newport Bay Entrance, Corona del Mar California 20.9°C
45 Santa Ana River entrance (Inside) California 20.9°C
46 Long Beach, Inner Harbor California 20.9°C
47 Long Beach, Terminal Island California 20.9°C
48 Los Patos (Highway Bridge) California 20.9°C
49 Avalon California 20.9°C
50 Carson California 20.9°C

Coldest 10 in California in September

Same data the other way.

# Location September mean
1 Clear Lake California 12.9°C
2 Lake Sonoma California 12.9°C
3 Lakeport California 12.9°C
4 Green Cove California 12.9°C
5 Arena Cove California 13.2°C
6 Point Arena California 13.2°C
7 Dillon Beach California 13.2°C
8 Lake Almanor California 13.2°C
9 Sea Ranch California 13.2°C
10 Crescent City California 13.3°C

Other US states

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