Portland Offshore Weather Forecast
- 14
- 20
Light rain increasing
- 12
- 17
Showers
- 10
- 14
Showers increasing
- 9
- 15
Shower or two
- 8
- 15
Cloudy
- 7
- 16
Shower or two
- 9
- 15
Shower or two
Today 30 Sep South West
Cloudy. High chance of rain, most likely in the afternoon and evening. Mostly light falls. The chance of a thunderstorm in the late morning and afternoon. Winds north to northwesterly 15 to 25 km/h tending west to northwesterly 15 to 20 km/h in the evening then becoming light in the late evening. Daytime maximum temperatures in the low 20s.
West Victoria Coastal Waters
SA-Vic Border to Cape Otway- Wind
- West to northwesterly 10 to 15 knots decreasing to about 10 knots in the late afternoon.
- Seas
- Around 1 metre.
- 1st Swell
- Southwesterly 2 to 2.5 metres.
- Weather
- Cloudy. 90% chance of light rain. The chance of a thunderstorm inshore in the late afternoon and evening.
- Weather Situation
- A high pressure system over the Tasman Sea is directing a warm northerly airstream across Victoria as a low pressure trough crosses the Bight. The trough is expected to move over western Victoria late on Wednesday before moving slowly across central Victoria during Thursday. The trough is forecast to deepen over eastern Victoria throughout Friday before moving over the Tasman Sea during Saturday as a high pressure system approaches Tasmania.
Portland Offshore Temperature Statistics View More
September Temperature
Cape Nelson Lighthouse (9km)
Lowest 8 September, 2026
3.5 °CAverage September
13.2 °CHighest 20 September, 2026
25.5 °C
Climate (2021–2026)
Cape Nelson Lighthouse (9km)
Average Low 2021–2026
11.9 °CAverage 2021–2026
14.4 °CAverage High 2021–2026
17.6 °C