Pismo Beach — Water Temperature in May

Water Temperature Range

10°C

minimum

12°C

average

15°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

9°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

13 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

10 hrs

Average Wind Speed

17 km/h

Average Humidity

75%

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.