Port Arthur Weather Forecast
- 10
- 21
Rain increasing
- 11
- 19
Showers easing
- 10
- 17
Shower or two
- 10
- 16
Showers. Windy
- 9
- 16
Showers. Windy
- 9
- 17
Shower or two
- 11
- 19
Sunny
Today 21 Dec South East
Partly cloudy. Very high chance of rain in the late afternoon and evening. Winds west to northwesterly 15 to 25 km/h tending northeast to southeasterly in the middle of the day then tending southeast to southwesterly 20 to 30 km/h in the evening. Overnight temperatures falling to between 7 and 11 with daytime temperatures reaching between 18 and 23.
South East Coastal Waters
Tasman Island to South East Cape- Wind
- Westerly 15 to 20 knots, reaching up to 25 knots offshore early in the morning. Winds shifting east to northeasterly 10 to 15 knots in the late morning and early afternoon then tending east to southeasterly 15 to 20 knots in the late evening.
- Seas
- 1.5 to 2.5 metres, decreasing to 1 metre during the morning.
- 1st Swell
- Southerly around 1 metre, increasing to 1 to 1.5 metres during the morning.
- Weather
- Cloudy. 80% chance of rain.
Port Arthur Temperature Statistics View More
December Temperature
Tasman Island (16km)
Lowest 7 December, 2025
5.4 °CAverage December
12.4 °CHighest 4 December, 2025
24.6 °C
Climate (2020–Present)
Tasman Island (16km)
Average Low 2020–2025
9.3 °CAverage 2020–2025
11.5 °CAverage High 2020–2025
14.5 °C