Mandurah — Water Temperature in December

Water Temperature Range

18°C

minimum

21°C

average

23°C

maximum

Water Temperature Chart for December

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

	2025	2024	2023	2022
DEC 1	20°C	21°C	19°C	21°C
DEC 2	20°C	20°C	20°C	21°C
DEC 3	20°C	20°C	20°C	21°C
DEC 4	20°C	20°C	20°C	21°C
DEC 5	20°C	20°C	20°C	21°C
DEC 6	21°C	20°C	20°C	22°C
DEC 7	20°C	21°C	20°C	21°C
DEC 8	21°C	20°C	20°C	22°C
DEC 9	21°C	21°C	20°C	20°C
DEC 10	21°C	20°C	20°C	20°C
DEC 11	21°C	20°C	21°C	22°C
DEC 12	21°C	20°C	21°C	21°C
DEC 13	21°C	21°C	21°C	21°C
DEC 14	21°C	21°C	20°C	21°C
DEC 15	21°C	21°C	21°C	22°C
DEC 16	21°C	21°C	21°C	21°C
DEC 17	21°C	21°C	21°C	22°C
DEC 18	21°C	23°C	21°C	21°C
DEC 19	21°C	22°C	21°C	21°C
DEC 20	21°C	22°C	22°C	21°C
DEC 21	22°C	22°C	22°C	22°C
DEC 22	21°C	22°C	22°C	22°C
DEC 23	21°C	21°C	21°C	21°C
DEC 24	21°C	21°C	22°C	21°C
DEC 25	22°C	21°C	22°C	22°C
DEC 26	22°C	22°C	22°C	22°C
DEC 27	22°C	22°C	22°C	22°C
DEC 28	22°C	22°C	22°C	21°C
DEC 29	22°C	22°C	21°C	21°C
DEC 30	21°C	21°C	21°C	21°C
DEC 31	21°C	22°C	21°C	21°C

Climate and Swimming Opportunities in Mandurah in December

Average Day Air Temperature

27°C

Average Night Air Temperature

16°C

Precipitation Amount per Month

9 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

11 hrs

Average Wind Speed

20 km/h

Average Humidity

44%

At such water and air temperatures, swimming is pleasant and refreshing rather than hot. After you get in, it feels comfortable, and you’ll warm up quickly when you come out.