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

75.1

°F

January 7, 22:35

Trend:

increasing

Yesterday:

75.1°F

Tomorrow:

75.3°F

Sunrise:

05:18

Sunset:

19:27

Day Length:

14 h. 9 min.

Perth in January

Minimum:

70.6°F

Average:

73.4°F

Maximum:

75.2°F

Sea water temperature in Perth today

As of now, in Perth, the water temperature is 75.1°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.5°F higher 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 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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 75.5°F on 2025, while the historical minimum was 71.7°F on 2017.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 75.6°F, with minimum temperature starting at 75.3°F, while the maximum might reach 75.7°F.

Daily water temperature in Perth

Date Current Year

actual* / forecast**

last year 10 years average
Jan 1 73.4°F 74.7°F 73.4°F
Jan 2 74.2°F 75.1°F 73.6°F
Jan 3 74.0°F 74.8°F 73.6°F
Jan 4 74.3°F 75.3°F 73.6°F
Jan 5 74.9°F 75.4°F 73.8°F
Jan 6 75.1°F 75.5°F 73.7°F
Jan 7 75.1°F 75.5°F 73.6°F
Jan 8 75.3°F 75.5°F 73.8°F
Jan 9 75.5°F 75.7°F 74.0°F
Jan 10 75.7°F 75.7°F 74.2°F
Jan 11 75.6°F 75.5°F 74.2°F
Jan 12 75.6°F 75.6°F 74.1°F
Jan 13 75.6°F 75.5°F 74.2°F
Jan 14 75.6°F 75.7°F 74.1°F
Dec 24 73.9°F 75.6°F 73.3°F
Dec 25 74.0°F 75.3°F 73.5°F
Dec 26 74.0°F 75.4°F 73.8°F
Dec 27 73.8°F 75.0°F 73.9°F
Dec 28 73.5°F 74.8°F 73.8°F
Dec 29 73.5°F 74.7°F 73.6°F
Dec 30 73.5°F 74.3°F 73.6°F
Dec 31 73.2°F 74.5°F 73.6°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 88 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, 70.8°F in Spring, 64.8°F in Summer, and 65.7°F in Autumn.