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

69.1

°F

April 11, 22:35

Trend:

decreasing

Yesterday:

70.4°F

Tomorrow:

68.9°F

Sunrise:

06:34

Sunset:

18:01

Day Length:

11 h. 27 min.

Perth in April

Minimum:

71.0°F

Average:

73.6°F

Maximum:

75.3°F

Sea water temperature in Perth today

As of now, in Perth, the water temperature is 69.1°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 2.1°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 73.1°F on 2021, while the historical minimum was 68.7°F on 2017.

Over the last two weeks, the water temperature has stayed slightly lower than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 68.7°F, the minimum temperature may reach 68.5°F, and the maximum might stay at 69.0°F.

Daily water temperature in Perth

Date Current Year

actual* / forecast**

last year 10 years average
Mar 28 73.9°F 75.5°F 72.8°F
Mar 29 73.2°F 76.1°F 72.8°F
Mar 30 72.9°F 75.6°F 72.6°F
Mar 31 72.2°F 74.8°F 72.5°F
Apr 1 71.8°F 74.8°F 72.4°F
Apr 2 71.4°F 75.1°F 72.3°F
Apr 3 70.7°F 74.7°F 72.0°F
Apr 4 70.9°F 74.3°F 72.0°F
Apr 5 70.5°F 73.6°F 71.7°F
Apr 6 71.2°F 72.9°F 71.7°F
Apr 7 70.4°F 73.0°F 71.4°F
Apr 8 70.2°F 73.2°F 71.3°F
Apr 9 70.7°F 73.3°F 71.4°F
Apr 10 70.4°F 73.5°F 71.2°F
Apr 11 69.1°F 72.8°F 71.3°F
Apr 12 68.9°F 72.5°F 71.0°F
Apr 13 69.0°F 73.1°F 71.1°F
Apr 14 68.8°F 73.0°F 70.9°F
Apr 15 68.8°F 73.6°F 70.9°F
Apr 16 68.6°F 72.8°F 70.7°F
Apr 17 68.5°F 72.4°F 70.6°F
Apr 18 68.5°F 72.9°F 70.7°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 90 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 73.6°F in Winter, 70.9°F in Spring, 64.8°F in Summer, and 65.7°F in Autumn.