Oak Harbor — Water Temperature in May

Water Temperature Range

6°C

minimum

9°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

8°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

50 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

8 hrs

Average Wind Speed

12 km/h

Average Humidity

70%

At such water and air temperatures, swimming feels icy and can be a shock to the body. If you go in at all, keep it extremely short and warm up immediately afterward.