Stamford — Water Temperature in May

Water Temperature Range

8°C

minimum

12°C

average

17°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	2025	2024	2023	2022
MAY 1	9°C	10°C	11°C	8°C
MAY 2	9°C	9°C	11°C	8°C
MAY 3	9°C	9°C	11°C	8°C
MAY 4	10°C	10°C	11°C	9°C
MAY 5	10°C	11°C	11°C	9°C
MAY 6	11°C	11°C	12°C	9°C
MAY 7	11°C	11°C	12°C	10°C
MAY 8	11°C	12°C	12°C	10°C
MAY 9	11°C	12°C	12°C	10°C
MAY 10	11°C	11°C	12°C	9°C
MAY 11	11°C	12°C	12°C	9°C
MAY 12	11°C	11°C	11°C	9°C
MAY 13	11°C	11°C	12°C	9°C
MAY 14	11°C	11°C	12°C	10°C
MAY 15	12°C	12°C	12°C	10°C
MAY 16	12°C	13°C	13°C	10°C
MAY 17	13°C	13°C	14°C	10°C
MAY 18	13°C	14°C	14°C	10°C
MAY 19	13°C	14°C	14°C	11°C
MAY 20	13°C	13°C	15°C	11°C
MAY 21	13°C	13°C	15°C	11°C
MAY 22	14°C	14°C	16°C	11°C
MAY 23	14°C	14°C	15°C	11°C
MAY 24	14°C	12°C	16°C	11°C
MAY 25	14°C	12°C	16°C	11°C
MAY 26	14°C	12°C	17°C	12°C
MAY 27	14°C	12°C	17°C	12°C
MAY 28	14°C	13°C	17°C	11°C
MAY 29	14°C	12°C	16°C	13°C
MAY 30	15°C	13°C	15°C	13°C
MAY 31	15°C	13°C	15°C	13°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

11°C

Average Day Air Temperature

20°C

Precipitation Amount per Month

103 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

8 hrs

Average Wind Speed

14 km/h

Average Humidity

65%

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.