Alameda — Water Temperature in September

Water Temperature Range

11°C

minimum

16°C

average

19°C

maximum

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Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2025	2024	2023	2022
SEP 1	16°C	15°C	18°C	18°C
SEP 2	16°C	15°C	18°C	17°C
SEP 3	16°C	14°C	19°C	18°C
SEP 4	17°C	16°C	18°C	18°C
SEP 5	16°C	15°C	18°C	18°C
SEP 6	16°C	15°C	18°C	18°C
SEP 7	16°C	15°C	18°C	18°C
SEP 8	16°C	16°C	18°C	18°C
SEP 9	16°C	16°C	18°C	18°C
SEP 10	16°C	16°C	18°C	18°C
SEP 11	16°C	16°C	19°C	17°C
SEP 12	16°C	17°C	18°C	17°C
SEP 13	16°C	16°C	19°C	18°C
SEP 14	16°C	17°C	18°C	18°C
SEP 15	17°C	16°C	18°C	18°C
SEP 16	16°C	16°C	18°C	19°C
SEP 17	17°C	17°C	17°C	19°C
SEP 18	17°C	17°C	18°C	19°C
SEP 19	17°C	16°C	18°C	19°C
SEP 20	16°C	16°C	19°C	19°C
SEP 21	16°C	16°C	18°C	18°C
SEP 22	16°C	16°C	19°C	18°C
SEP 23	17°C	16°C	19°C	18°C
SEP 24	17°C	17°C	19°C	18°C
SEP 25	17°C	17°C	18°C	18°C
SEP 26	16°C	16°C	18°C	18°C
SEP 27	16°C	16°C	18°C	18°C
SEP 28	17°C	17°C	19°C	18°C
SEP 29	16°C	16°C	18°C	17°C
SEP 30	16°C	17°C	18°C	17°C

September: Climate and Swimming Opportunities

Average Night Air Temperature

23°C

Average Day Air Temperature

32°C

Precipitation Amount per Month

182 mm

Number of Rainy Days

Daylight per Day

12 hrs

Sunshine per Day

8 hrs

Average Wind Speed

12 km/h

Average Humidity

78%

With such a ratio between the average monthly temperatures of water and air, the swim feels brisk and very refreshing. The air is warm enough to make the cool water easy to handle, especially for short swims.