Sydney in September
In September, Sydney averages 20°C (68°F) during the day and 11°C (52°F) at night, with around 9 days of rain (69 mm total).
High seasonConditions are comfortable for sightseeing without being sweltering. Occasional showers are likely but won't dominate.
September is a great month to visit Sydney: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Sydney
September is in the middle of the year for warmth in Sydney (8th of 12) and one of the driest months (12th of 12). Daytime temperature runs 2°C below the annual average (22°C). September runs 2°C warmer than August (18°C) and warms a further 2°C into October (22°C).
September sunrise & sunset in Sydney
Times shown for Sydney local time (Australia/Sydney), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Sydney — September
Golden-hour and blue-hour windows for the 15th of September, in Sydney's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Sydney in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Sydney's popularity.
Crowds & pricing — September in Sydney
This is a busy month in Sydney — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Sydney
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Sydney — September
Across the year Sydney's sea swings from 17.7°C (July) to 23.4°C (February) — September sits at 18.4°C.
Sydney in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 26°C / 79°F | 19°C / 66°F | 102 mm | 11 | — |
| February | 26°C / 79°F | 19°C / 66°F | 117 mm | 11 | — |
| March | 25°C / 77°F | 17°C / 63°F | 130 mm | 12 | — |
| April | 22°C / 72°F | 14°C / 57°F | 127 mm | 11 | — |
| May | 19°C / 66°F | 11°C / 52°F | 121 mm | 11 | — |
| June | 17°C / 63°F | 9°C / 48°F | 131 mm | 11 | — |
| July | 17°C / 63°F | 8°C / 46°F | 98 mm | 9 | — |
| August | 18°C / 64°F | 9°C / 48°F | 81 mm | 9 | — |
| September | 20°C / 68°F | 11°C / 52°F | 69 mm | 9 | — |
| October | 22°C / 72°F | 13°C / 55°F | 77 mm | 10 | — |
| November | 24°C / 75°F | 16°C / 61°F | 84 mm | 10 | — |
| December | 25°C / 77°F | 18°C / 64°F | 78 mm | 11 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Sydney in September →
Frequently asked questions
How hot is Sydney in September?
In September, Sydney averages a high of 20°C (68°F) and a low of 11°C (52°F) — generally mild and pleasant.
Does it rain a lot in Sydney in September?
September sees occasional rain in Sydney, with about 9 rainy days on average.
Is September a good time to visit Sydney?
September is mild and pleasant. It suits travelers who are comfortable with mild and pleasant weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Sydney in September?
Pack light layers for warm days and cooler evenings. See the full September packing list for Sydney for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.