Portland Harbour Weather Forecast
- 11
- 16
Shower or two
- 7
- 17
Partly cloudy
- 9
- 17
Showers
- 9
- 17
Shower or two
- 9
- 17
Cloudy
- 8
- 17
Partly cloudy
- 8
- 17
Shower or two
Today 17 May South West
Cloudy. High chance of showers in the east, medium chance elsewhere. The chance of a thunderstorm in the late morning and afternoon. Light winds becoming south to southwesterly 15 to 20 km/h in the middle of the day then becoming light in the evening. Daytime maximum temperatures around 17.
West Victoria Coastal Waters
SA-Vic Border to Cape Otway- Wind
- Variable about 10 knots becoming southerly 10 to 15 knots in the middle of the day then decreasing to about 10 knots in the late evening.
- Seas
- Below 1 metre.
- 1st Swell
- Southwesterly 2.5 to 3 metres.
- Weather
- Cloudy. 80% chance of showers in the far east, 50% chance elsewhere.
- Weather Situation
- A high pressure ridge over the far east weakens as a slow moving trough approaches the western border. This trough will slowly cross over the state, reaching central parts late today and clearing eastwards into the Tasman by Monday afternoon. A new weak ridge develops in the west following the trough but is pushed over the north as a series of weak cold fronts cross to the south early next week. By the middle of the weak the high pressure ridge is expected to extend broadly across Victoria.
Portland Harbour Temperature Statistics View More
May Temperature
Cape Nelson Lighthouse (11km)
Lowest 7 May, 2026
6.7 °CAverage May
15.2 °CHighest 1 May, 2026
28.1 °C
Climate (2021–Present)
Cape Nelson Lighthouse (11km)
Average Low 2021–2026
11.8 °CAverage 2021–2026
14.3 °CAverage High 2021–2026
17.6 °C