Bay City — Water Temperature in May

Water Temperature Range

9°C

minimum

12°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

16°C

Precipitation Amount per Month

117 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

8 hrs

Average Wind Speed

14 km/h

Average Humidity

78%

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.