Weather in Sydney for September 2025
Until now, September 2025 in Sydney has been nearly identical to the historical average, with a temperature of 19.2 °C (showing only a slight deviation of -0.5 °C).
The forecast for the upcoming days in Sydney predicts a temperature of 21.8 °C, which is slightly above the historical average.
In general, the average temperature in Sydney at the beginning of September is 19.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 21.3 °C by the end of September.
Sydney in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 45.3 mm.
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Sydney Weather September
Temperatures trend during September in Sydney
September weather in Sydney day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 20° /11° | 0.9 mm | 6 | |
| 2 Sept. | Sunny | 19° /11° | 0.2 mm | 6 | |
| 3 Sept. | Sunny | 18° /11° | 1.6 mm | 6 | |
| 4 Sept. |  Partly cloudy | 20° /12° | 1.8 mm | 6 | |
| 5 Sept. |  Patchy rain possible | 19° /12° | 1.2 mm | 5 | |
| 6 Sept. | Sunny | 19° /11° | 0.3 mm | 6 | |
| 7 Sept. | Partly cloudy | 21° /11° | 0.3 mm | 6 | |
| 8 Sept. | Partly cloudy | 22° /13° | 1.5 mm | 6 | |
| 9 Sept. | Sunny | 21° /12° | 2.1 mm | 6 | |
| 10 Sept. | Patchy rain possible | 19° /11° | 5.5 mm | 5 | |
| 11 Sept. | Sunny | 20° /11° | 1.6 mm | 6 | |
| 12 Sept. | Sunny | 20° /11° | 0.8 mm | 6 | |
| 13 Sept. |  Moderate rain at times | 17° /11° | 0.9 mm | 5 | |
| 14 Sept. | Sunny | 18° /10° | 0.5 mm | 6 | |
| 15 Sept. | Sunny | 24° /12° | 0 mm | 1.5 | |
| 16 Sept. | Sunny | 25° /17° | 0 mm | 1.3 | |
| 17 Sept. | Sunny | 22° /15° | 0 mm | 1.5 | |
| 18 Sept. | Patchy rain possible | 19° /12° | 0.5 mm | 1.6 | |
| 19 Sept. | Sunny | 23° /12° | 0 mm | 6 | |
| 20 Sept. | Sunny | 22° /15° | 0 mm | 6 | |
| 21 Sept. | Sunny | 23° /12° | 0 mm | 6 | |
| 22 Sept. | Sunny | 21° /11° | 0 mm | 6 | |
| 23 Sept. | Sunny | 17° /12° | 0 mm | 5 | |
| 24 Sept. | Sunny | 21° /10° | 0 mm | 6 | |
| 25 Sept. | Sunny | 21° /13° | 0 mm | 6 | |
| 26 Sept. | Partly cloudy | 21° /13° | 0.1 mm | 6 | |
| 27 Sept. | Partly cloudy | 18° /13° | 0.1 mm | 6 | |
| 28 Sept. | Sunny | 28° /14° | 0 mm | 7 | |
| 29 Sept. |  Heavy rain at times | 20° /14° | 2.9 mm | 6 | |
| 30 Sept. | Patchy rain possible | 20° /14° | 3 mm | 6 | |
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Sydney in September - FAQ
Sydney water temperatures in September
The average water temperature of the Pacific Ocean near Sydney in September is 17.7 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Sydney in September?
- The average water temperature in Sydney in September is 17.7 °C.
- Can you swim in Sydney in September?
- Brisk: quick dips and active swimming are fine, but pack a 2–3 mm spring suit if you plan longer sessions or early-morning outings.
September rainfall patterns in Sydney
UV exposure in Sydney during September
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