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

64.5

°F

September 17, 10:06

Trend:

increasing

Yesterday:

64.3°F

Tomorrow:

64.6°F

Sunrise:

06:14

Sunset:

18:09

Day Length:

11 h. 55 min.

Perth in September

Minimum:

71.7°F

Average:

74.1°F

Maximum:

75.7°F

Sea water temperature in Perth today

As of now, in Perth, the water temperature is 64.5°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 1.0°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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 65.5°F on 2019, while the historical minimum was 60.9°F on 2018.

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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 64.5°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
Sep 3 61.8°F 61.3°F 62.4°F
Sep 4 62.9°F 61.7°F 62.5°F
Sep 5 62.9°F 62.0°F 62.5°F
Sep 6 63.2°F 62.1°F 62.4°F
Sep 7 62.6°F 62.0°F 62.3°F
Sep 8 62.6°F 62.2°F 62.4°F
Sep 9 62.8°F 61.5°F 62.5°F
Sep 10 62.6°F 61.0°F 62.5°F
Sep 11 62.7°F 60.6°F 62.6°F
Sep 12 63.2°F 60.9°F 62.9°F
Sep 13 63.6°F 61.3°F 63.1°F
Sep 14 63.8°F 61.6°F 63.2°F
Sep 15 63.9°F 61.9°F 63.3°F
Sep 16 64.3°F 62.2°F 63.3°F
Sep 17 64.5°F 62.3°F 63.4°F
Sep 18 64.6°F 62.4°F 63.6°F
Sep 19 64.8°F 62.8°F 63.7°F
Sep 20 64.6°F 62.4°F 63.5°F
Sep 21 64.4°F 62.6°F 63.4°F
Sep 22 64.4°F 62.8°F 63.3°F
Sep 23 64.5°F 63.4°F 63.4°F
Sep 24 64.4°F 63.3°F 63.4°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 August 16, 2026, dipping to 59.8°F. The average readings by season are 73.6°F in Winter, 70.8°F in Spring, 64.7°F in Summer, and 65.7°F in Autumn.