St Marys Weather Forecast
- 13
- 28
Mostly clear
- 15
- 27
Sunny
- 9
- 25
Sunny
- 11
- 31
Possible shower
- 11
- 25
Sunny
- 8
- 24
Mostly sunny
- 11
- 22
Partly cloudy
Today 2 Sep Sydney
Mostly sunny. Winds northwesterly 25 to 35 km/h tending westerly 20 to 30 km/h in the early afternoon then becoming light in the evening.
St Marys Temperature Statistics View More
September Temperature
Penrith Lakes (10km)
Lowest 1 September, 2026
6.8 °CAverage September
12.1 °CHighest
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Climate (2021–2026)
Penrith Lakes (10km)
Average Low 2021–2026
12.7 °CAverage 2021–2026
17.9 °CAverage High 2021–2026
24.9 °C