Rehoboth Beach — Water Temperature in May

Water Temperature Range

8°C

minimum

15°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

22°C

Precipitation Amount per Month

92 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

9 hrs

Average Wind Speed

15 km/h

Average Humidity

72%

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.