American Beach Weather Forecast
- 13
- 21
Shower
- 13
- 21
Rain
- 12
- 21
Cloudy
- 13
- 19
Cloudy
- 13
- 20
Cloudy
- 13
- 19
Cloudy
- 13
- 22
Partly cloudy
Today 20 Dec Kangaroo Island
Partly cloudy. Medium chance of showers in the evening. The chance of a thunderstorm at night. Winds southeasterly 15 to 25 km/h turning easterly in the late evening. Daytime maximum temperatures in the low to mid 20s.
Investigator Strait Coastal Waters
- Wind
- East to southeasterly 10 to 15 knots tending south to southeasterly 15 to 20 knots in the early afternoon then tending east to southeasterly 10 to 15 knots in the late evening.
- Seas
- Below 1 metre, increasing to 1 to 1.5 metres by early evening.
- 1st Swell
- Southerly around 1 metre through the Backstairs Passage.
- Weather
- Mostly sunny day. 60% chance of showers in the evening. The chance of a thunderstorm at night.
- Weather Situation
- A broad trough of low pressure lies over east and northern parts of the State. This area of low pressure is expected to linger over the northeast today before moving east Sunday with the next low pressure system that develops south of the bight. A high pressure ridge then extends over the west and south during Sunday, and throughout by Monday. A persistent high pressure ridge remains over the State and Coastal Waters during Tuesday and Wednesday.
American Beach Temperature Statistics View More
December Temperature
Cape Willoughby (24km)
Lowest 2 December, 2025
10.7 °CAverage December
17.6 °CHighest 18 December, 2025
35.9 °C
Climate (2020–Present)
Cape Willoughby (24km)
Average Low 2020–2025
13.3 °CAverage 2020–2025
15.3 °CAverage High 2020–2025
18.4 °C