Saint Petersburg — Water Temperature in December

Water Temperature Range

15°C

minimum

20°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

64 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

6 hrs

Average Wind Speed

13 km/h

Average Humidity

75%

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.