Water temperature in St Thomas Bay in December

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Is it warm enough to swim in St Thomas Bay in December? Average water temperature in St Thomas Bay in December is 18.5°C and therefore is not suitable for comfortable swimming. The warmest sea in St Thomas Bay in December is 21.5°C, and the coldest is 16.4°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in St Thomas Bay

Changes water temperature in St Thomas Bay in December 2025, 2024

To get an accurate forecast for the water temperature in St Thomas Bay for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in St Thomas Bay, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of December.

Sea temperature

Sea state

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 December	19.6°C	21.4°C	18.9°C	21.4°C
2 December	19.5°C	21.5°C	18.9°C	21.5°C
3 December		21.2°C	18.7°C	21.2°C
4 December		21.2°C	18.9°C	21.2°C
5 December		20.9°C	18.7°C	20.9°C
6 December		21.3°C	18.3°C	21.3°C
7 December		21.1°C	18.2°C	21.1°C
8 December		20.7°C	18.1°C	20.7°C
9 December		20.6°C	18°C	20.6°C
10 December		20.7°C	17.9°C	20.7°C
11 December		20.4°C	17.9°C	20.4°C
12 December		20.6°C	17.4°C	20.6°C
13 December		20.4°C	18.3°C	20.4°C
14 December		20.5°C	17.4°C	20.5°C
15 December		20.2°C	17.2°C	20.2°C

Day	2024	Min	Max
16 December	20.3°C	17.1°C	20.3°C
17 December	20.1°C	17.4°C	20.1°C
18 December	19.6°C	17.4°C	19.6°C
19 December	19.6°C	16.8°C	19.6°C
20 December	19.4°C	17.3°C	19.4°C
21 December	19.1°C	17.5°C	19.1°C
22 December	19°C	16.7°C	19°C
23 December	18.8°C	17.3°C	18.9°C
24 December	18.3°C	16.8°C	18.6°C
25 December	18.3°C	17.2°C	18.3°C
26 December	18.3°C	16.7°C	18.4°C
27 December	18.2°C	16.7°C	18.7°C
28 December	18°C	16.6°C	18.2°C
29 December	18°C	16.9°C	18°C
30 December	17.9°C	16.4°C	18.3°C
31 December	18°C	16.5°C	18.7°C

St Thomas Bay water temp chart in December

Average water temperature in St Thomas Bay in December over a decade

2015	2016	2017	2018	2019
18.3°C	18.7°C	18.1°C	18.4°C	18.1°C

2020	2021	2022	2023	2024
19.2°C	17.5°C	18.7°C	19.2°C	19.8°C

St Thomas Bay water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

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Our report for St Thomas Bay is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

Region

Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature