Port Phillip Bay Sea Temperature

Looking to find out what the sea water temperature in Port Phillip Bay is for today and the next few days? Below are data and charts that will give you information about sea temperatures in Port Phillip Bay and nearby locations.

Water temperature in Port Phillip Bay right now

Below is the current sea temperature for Port Phillip Bay, Australia on 18th March 2025.

21.92° C

(71.46° F)

yesterday: 21.69° C (71.04° F)
a week ago: 24.15° C (75.47° F)

Water at this temperature is very pleasant to swim in and if you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

The average sea temperature for Port Phillip Bay on March 18th over the last 10 years is 20.47° C (68.85° F), with a low temperature of 18.96° C (66.13° F) and a high of 21.84° C (71.31° F).

Analysis and forecast for Port Phillip Bay water temperatures

The water temperature in Port Phillip Bay today is higher than the average temperature of 20.47° C (68.85° F) and the temperature on this day last year, 18th March 2024, was 21.84° C (71.31° F).

The chart and table below shows the change in water temperature in Port Phillip Bay over the last 30 days:

Date	Temperature (Celsius)	Temperature (Fahrenheit)
March 18	21.92° C	71.46° F
March 17	21.69° C	71.04° F
March 16	23.18° C	73.72° F
March 15	24.36° C	75.85° F
March 14	22.81° C	73.06° F
March 13	22.68° C	72.82° F
March 12	23.65° C	74.57° F
March 11	24.15° C	75.47° F
March 10	23.54° C	74.37° F
March 9	23.06° C	73.51° F
March 8	22.31° C	72.16° F
March 7	21.79° C	71.22° F
March 6	21.69° C	71.04° F
March 5	22.04° C	71.67° F
March 4	21.85° C	71.33° F
March 3	21.58° C	70.84° F
March 2	21.72° C	71.1° F
March 1	21.8° C	71.24° F
February 28	21.63° C	70.93° F
February 27	21.65° C	70.97° F
February 26	21.66° C	70.99° F
February 25	21.48° C	70.66° F
February 24	21.26° C	70.27° F
February 23	21.26° C	70.27° F
February 22	21.22° C	70.2° F
February 21	21.01° C	69.82° F
February 20	20.89° C	69.6° F
February 19	20.99° C	69.78° F
February 18	21.2° C	70.16° F
February 17	21.83° C	71.29° F
February 16	22.32° C	72.18° F

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in Port Phillip Bay by month

The chart below shows the monthly average water temperature in Port Phillip Bay.

For more detailed information on how the sea temperature in Port Phillip Bay changes for each month of the year, choose from the months below.

January February March April May June July August September October November December

Port Phillip Bay map and nearby water temperatures