All data are in degrees Fahrenheit

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Water temperature in Perth

Detailed information about the current water temperature in Perth. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Perth now

73.9

°F

December 24, 16:48

Trend:

increasing

Yesterday:

73.4°F

Tomorrow:

74.1°F

Sunrise:

05:09

Sunset:

19:23

Day Length:

14 h. 14 min.

Perth in December

Minimum:

71.7°F

Average:

73.9°F

Maximum:

76.0°F

Sea water temperature in Perth today

As of now, in Perth, the water temperature is 73.9°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.9°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 75.6°F on 2024, while the historical minimum was 71.3°F on 2015.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 74.3°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Perth

Date Current Year

actual* / forecast**

last year 10 years average
Dec 10 71.9°F 72.6°F 71.2°F
Dec 11 71.9°F 72.5°F 71.3°F
Dec 12 72.1°F 72.6°F 71.3°F
Dec 13 72.3°F 73.1°F 71.6°F
Dec 14 72.7°F 72.9°F 71.5°F
Dec 15 72.7°F 73.1°F 71.5°F
Dec 16 73.1°F 73.0°F 71.7°F
Dec 17 73.5°F 73.2°F 71.8°F
Dec 18 73.6°F 73.3°F 72.0°F
Dec 19 73.7°F 73.4°F 72.0°F
Dec 20 73.8°F 73.8°F 71.9°F
Dec 21 73.1°F 74.5°F 72.1°F
Dec 22 72.9°F 74.9°F 72.5°F
Dec 23 73.4°F 75.3°F 72.8°F
Dec 24 73.9°F 75.6°F 73.0°F
Dec 25 74.1°F 75.3°F 73.2°F
Dec 26 74.3°F 75.4°F 73.4°F
Dec 27 74.5°F 75.0°F 73.6°F
Dec 28 74.4°F 74.8°F 73.5°F
Dec 29 74.3°F 74.7°F 73.4°F
Dec 30 74.2°F 74.3°F 73.3°F
Dec 31 74.2°F 74.5°F 73.3°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Perth by month

In Perth, the months January through March offer comfortable swimming conditions, which amounts to 81 swimming days.
The warmest water in Perth was recorded on February 8, 2025, reaching a 78.6°F. While the coldest temperature occurred on September 11, 2025, dipping to 60.6°F. The average readings by season are 73.4°F in Winter, 70.8°F in Spring, 64.8°F in Summer, and 65.8°F in Autumn.