Portsmouth — Water Temperature in October

Water Temperature Range

16°C

minimum

21°C

average

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

October: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

20°C

Precipitation Amount per Month

84 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

7 hrs

Average Wind Speed

14 km/h

Average Humidity

73%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.