St Marys Weather Forecast

Today 14 Dec
- 18
- 34
Partly cloudy
Mon 15 Dec
- 17
- 25
Shower or two
Tue 16 Dec
- 15
- 21
Shower or two
Wed 17 Dec
- 15
- 27
Cloudy
Thu 18 Dec
- 14
- 34
Sunny
Fri 19 Dec
- 18
- 37
Possible shower developing
Sat 20 Dec
- 19
- 33
Shower or two

Today 14 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Mon 15 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Tue 16 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Wed 17 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Thu 18 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Fri 19 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm
Sat 20 Dec
1. 2 am
2. 5 am
3. 8 am
4. 11 am
5. 2 pm
6. 5 pm
7. 8 pm
8. 11 pm

Today 14 Dec Sydney

Partly cloudy. Slight chance of a shower. Winds northwesterly 15 to 20 km/h shifting southerly 35 to 55 km/h in the late evening.

St Marys Temperature Statistics View More

December Temperature

Penrith Lakes (10km)

Lowest 20 July, 2025
-0.3 °C
Average 2025
18.1 °C
Highest 28 January, 2025
42.5 °C
Lowest 12 November, 2025
7.5 °C
Average November
21.4 °C
Highest 25 November, 2025
37.2 °C
Lowest 1 December, 2025
11.3 °C
Average December
22.7 °C
Highest 6 December, 2025
41.7 °C

Climate (2020–Present)

Penrith Lakes (10km)

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Average Low 2020–2025
12.5 °C
Average 2020–2025
17.7 °C
Average High 2020–2025
24.7 °C

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