Santa Casa Beach Weather Forecast
- 12
- 18
Storm
- 10
- 20
Cloudy
- 12
- 19
Shower
- 11
- 20
Shower
- 11
- 17
Windy
- 11
- 18
Cloudy
- 11
- 23
Sunny
Today 21 Dec Central
Cloudy. The chance of fog in the east in the early morning. Very high chance of rain. The chance of a thunderstorm in the morning and afternoon. Winds northeast to southeasterly 15 to 20 km/h tending south to southeasterly in the middle of the day then turning southwesterly 20 to 30 km/h in the early afternoon. Overnight temperatures falling to between 9 and 12 with daytime temperatures reaching between 19 and 23.
Port Phillip Local Waters
- Wind
- East to southeasterly 10 to 15 knots shifting southwesterly 15 to 25 knots in the late afternoon. Winds reaching up to 30 knots in the south in the evening.
- Seas
- Below 0.5 metres, increasing to around 1 metre around midday.
- Weather
- Cloudy. 90% chance of rain. The chance of a thunderstorm this afternoon.
- Weather Situation
- A low pressure system south of the Bight will move east and combine with a broad trough over western Victoria early Sunday. The low pressure system will then deepen and slowly move southeast across the State during Sunday to clear into eastern Bass Strait late Sunday. A high pressure ridge then builds across Victoria and Bass Strait during Monday. A weak cold front crosses Bass Strait during late Monday and early Tuesday with the ridge re-establishing itself from Tuesday to Thursday.
Santa Casa Beach Temperature Statistics View More
December Temperature
Avalon Airport (31km)
Lowest 7 December, 2025
6.6 °CAverage December
17.2 °CHighest 18 December, 2025
39.5 °C
Climate (2020–Present)
Avalon Airport (31km)
Average Low 2020–2025
9.6 °CAverage 2020–2025
14.5 °CAverage High 2020–2025
20.4 °C