Cape Northumberland Weather Forecast
- 12
- 18
Shower
- 10
- 24
Shower
- 10
- 16
Partly cloudy
- 10
- 14
Shower
- 9
- 15
Cloudy
- 7
- 17
Partly cloudy
- 8
- 20
Cloudy
Today 10 Oct Lower South East
Partly cloudy. Medium chance of showers, becoming less likely in the evening. Winds northwesterly 25 to 40 km/h decreasing to 15 to 25 km/h in the evening then becoming light in the late evening. Daytime maximum temperatures around 19.
Lower South East Coastal Waters
Cape Jaffa to SA-Vic Border- Wind
- Northwesterly 15 to 25 knots, reaching up to 30 knots south of Beachport in the late morning and early afternoon. Winds decreasing to 10 to 15 knots in the evening.
- Seas
- 1.5 to 2.5 metres, decreasing to 1 to 1.5 metres by early evening, then decreasing to 1 metre later in the evening.
- 1st Swell
- Westerly 3 to 4 metres.
- Weather
- Partly cloudy. 50% chance of showers.
- Weather Situation
- A high pressure system briefly establishes in the north today. Another series of troughs and cold fronts are expected to enter western SA early on Sunday, crossing the state and then clearing in the east by the end of Monday. A ridge of high pressure will then push into western SA on Monday before the associated high moves into waters south on Tuesday. A trough over the WA/NT border will also extend into SA at times from Monday.
Cape Northumberland Temperature Statistics View More
October Temperature
Mount Gambier Airport (36 km)
Lowest 7 October, 2026
2.8 °CAverage October
13 °CHighest 8 October, 2026
25 °C
Climate (2021–2026)
Mount Gambier Airport (36 km)
Average Low 2021–2026
8.9 °CAverage 2021–2026
13.7 °CAverage High 2021–2026
20.1 °C