Londonderry — Water Temperature in May

Water Temperature Range

9°C

minimum

10°C

average

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

May: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

14°C

Precipitation Amount per Month

65 mm

Number of Rainy Days

Daylight per Day

16 hrs

Sunshine per Day

6 hrs

Average Wind Speed

17 km/h

Average Humidity

84%

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.