Gualala — Water Temperature in May

Water Temperature Range

8°C

minimum

11°C

average

15°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	2026	2025	2024	2023
MAY 1	-10°C	12°C	9°C	10°C
MAY 2	12°C	11°C	9°C	11°C
MAY 3	11°C	11°C	10°C	10°C
MAY 4	11°C	10°C	10°C	10°C
MAY 5	11°C	10°C	9°C	10°C
MAY 6	12°C	11°C	9°C	9°C
MAY 7	12°C	10°C	9°C	10°C
MAY 8	12°C	10°C	9°C	10°C
MAY 9	11°C	11°C	9°C	10°C
MAY 10	11°C	10°C	9°C	9°C
MAY 11	11°C	10°C	10°C	10°C
MAY 12	11°C	11°C	9°C	10°C
MAY 13	11°C	12°C	10°C	10°C
MAY 14	11°C	10°C	10°C	10°C
MAY 15	11°C	11°C	10°C	10°C
MAY 16	10°C	11°C	10°C	10°C
MAY 17	10°C	11°C	10°C	11°C
MAY 18	10°C	12°C	9°C	10°C
MAY 19	10°C	12°C	9°C	11°C
MAY 20	9°C	11°C	9°C	10°C
MAY 21	9°C	11°C	9°C	10°C
MAY 22	9°C	10°C	9°C	10°C
MAY 23	10°C	10°C	9°C	10°C
MAY 24	10°C	10°C	9°C	10°C
MAY 25	10°C	10°C	9°C	10°C
MAY 26	11°C	11°C	9°C	10°C
MAY 27	10°C	11°C	10°C	10°C
MAY 28	11°C	12°C	10°C	11°C
MAY 29	11°C	11°C	10°C	11°C
MAY 30	11°C	11°C	10°C	11°C
MAY 31	11°C	11°C	10°C	10°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

20°C

Average Day Air Temperature

31°C

Precipitation Amount per Month

62 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

10 hrs

Average Wind Speed

13 km/h

Average Humidity

71%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.