Portsmouth — Water Temperature in October

Water Temperature Range

9°C

minimum

14°C

average

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

October: Climate and Swimming Opportunities

Average Night Air Temperature

6°C

Average Day Air Temperature

17°C

Precipitation Amount per Month

105 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

6 hrs

Average Wind Speed

16 km/h

Average Humidity

70%

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.