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United States weather

Weather in Santa Catalina Island, California for September 2026

Your guide to Santa Catalina Island weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Santa Catalina Island at the beginning of September is 20.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 19.4 °F by the end of September.

    • Rain 🌧️

  • Precipitation in Santa Catalina Island during September is a rare event, with an average of fewer than 2 rainy days.

    • More

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Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/17°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
91 %
Avg humidity

Santa Catalina Island Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Fog
21°
2
Overcast
21°
3
Overcast
23°
4
Fog
20°
5
Fog
19°
6
Fog
19°
7
Fog
19°
8
Fog
20°
9
Overcast
19°
10
Overcast
19°
11
Overcast
20°
12
Mist
20°
13
Mist
19°
14
Fog
20°
15
Fog
20°
16
Fog
20°
17
Overcast
21°
18
Mist
22°
19
Fog
20°
20
Fog
19°
21
Fog
19°
22
Fog
21°
23
Fog
21°
24
Fog
20°
25
Fog
19°
26
Mist
19°
27
Overcast
20°
28
Mist
20°
29
Fog
19°
30
Fog
19°

Temperatures trend during September in Santa Catalina Island

See the weather trend as well as the moving average line

September weather in Santa Catalina Island day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Fog
Fog
 21° /18° 0 mm 3
Sept. 2 Overcast
Overcast
 21° /19° 0 mm 4
Sept. 3 Overcast
Overcast
 23° /19° 0 mm 6
Sept. 4 Fog
Fog
 20° /16° 0 mm 2
Sept. 5 Fog
Fog
 19° /14° 0 mm 3
Sept. 6 Fog
Fog
 19° /15° 0 mm 2
Sept. 7 Fog
Fog
 19° /15° 0 mm 3
Sept. 8 Fog
Fog
 20° /16° 0 mm 2
Sept. 9 Overcast
Overcast
 19° /17° 0 mm 2
Sept. 10 Overcast
Overcast
 19° /17° 0 mm 2
Sept. 11 Overcast
Overcast
 20° /17° 0 mm 2
Sept. 12 Mist
Mist
 20° /17° 0 mm 2
Sept. 13 Mist
Mist
 19° /17° 0 mm 2
Sept. 14 Fog
Fog
 20° /16° 0 mm 2
Sept. 15 Fog
Fog
 20° /18° 0 mm 2
Sept. 16 Fog
Fog
 20° /19° 0 mm 2
Sept. 17 Overcast
Overcast
 21° /19° 0 mm 3
Sept. 18 Mist
Mist
 22° /20° 5.6 mm 5
Sept. 19 Fog
Fog
 20° /17° 0 mm 2
Sept. 20 Fog
Fog
 19° /17° 0 mm 2
Sept. 21 Fog
Fog
 19° /16° 0 mm 1
Sept. 22 Fog
Fog
 21° /15° 0 mm 6
Sept. 23 Fog
Fog
 21° /19° 0 mm 2
Sept. 24 Fog
Fog
 20° /17° 0 mm 1
Sept. 25 Fog
Fog
 19° /17° 0 mm 1
Sept. 26 Mist
Mist
 19° /17° 0 mm 1
Sept. 27 Overcast
Overcast
 20° /17° 0 mm 3
Sept. 28 Mist
Mist
 20° /18° 0 mm 2
Sept. 29 Fog
Fog
 19° /16° 0 mm 1
Sept. 30 Fog
Fog
 19° /16° 0 mm 1
Next
Important Notice
Our weather forecast for Santa Catalina Island in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Santa Catalina Island forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Santa Catalina Island in September - FAQ

What are the expected maximum and minimum temperatures in Santa Catalina Island during September?

During September, expect a variety of temperatures with highs around 20° and lows near 17°, suitable for diverse activities and preferences.

How much rainfall should be expected in Santa Catalina Island during September?

Rainfall in Santa Catalina Island during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.

What are the typical wind conditions in Santa Catalina Island during September?

The average wind speed in Santa Catalina Island during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Santa Catalina Island

Explore the daily rainfall trends and prepare for Santa Catalina Islands September weather 💧
Typically, Santa Catalina Island has 1 rainy days in September with a total of 5.6 mm of rainfall.

UV exposure in Santa Catalina Island during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Santa Catalina Island?

Get accurate weather forecasts for Santa Catalina Island, located at latitude 33.383 and longitude -118.418. Stay updated with localized weather information tailored for Santa Catalina Island.

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