Sydney, Australia — Weather in September 2026

Climate Overview

Sydney, Australia in September has mild conditions, with highs averaging 20°C (68°F) and noticeably cooler mornings. Sea temperature stays cool at 18.6°C (65°F).

This month falls at the beginning of Spring.

Temperatures remain fairly steady throughout September, with daily highs around 19°C (66°F).

September sees fairly even rainfall, totalling about 43 mm across the month.

Expect around 9.6h of sunshine at the start of September, increasing to 10.3h by the end.

The warmest days tend to fall around the 17th, averaging 21.3°C (70°F).

Compared to August, this month is about 3°C warmer with 0 fewer rainy days.

Monthly September Averages

Temperature

20°C / 12°C

Feels Like

19°C / 11°C

Rain

6 days · 43 mm

Sunshine

10h / day

Humidity

66% — Humid

Wind

18 km/h

Wind Direction

WNW (300°)

Gusts

41 km/h

Daylight

11.9 h

Cloud Cover

38%

Clear Sky Days

10.6

UV Index

6 — High

Sea Temperature

19°C

Dew Point

10°C — Dry

Moon Phase

Waxing Crescent · 11%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 05:57

Daylight 11.8h

Sunset 17:47

What to Expect

Daytime temperatures around 20°C (68°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

1 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January best	26°C / 20°C	29°C / 22°C	10days (79 mm) Wet	10.3h Excellent	75% Muggy	7.9 Very High	Excellent	View Details
February best	26°C / 20°C	28°C / 22°C	11days (88 mm) Wet	10.3h Excellent	74% Muggy	7.4 Very High	Excellent	View Details
March best	24°C / 19°C	26°C / 20°C	14days (129 mm) Wet	9.2h Good	76% Humid	6.6 High	Excellent	View Details
April best	22°C / 16°C	22°C / 16°C	8days (57 mm) Wet	9.2h Good	74% Muggy	5 Moderate	Excellent	View Details
May	19°C / 13°C	18°C / 12°C	7days (55 mm) Good	8.4h Good	72% Muggy	3.5 Moderate	Good	View Details
June	16°C / 10°C	15°C / 8°C	7days (54 mm) Good	7.8h Good	73% Muggy	3.1 Moderate	Good	View Details
July	16°C / 10°C	14°C / 7°C	6days (63 mm) Good	8.3h Good	70% Muggy	3.4 Moderate	Good	View Details
August	17°C / 10°C	15°C / 8°C	6days (48 mm) Good	9h Good	68% Muggy	4.2 Moderate	Good	View Details
September	20°C / 12°C	19°C / 11°C	6days (43 mm) Good	10h Excellent	66% Muggy	6 High	Good	View Details
October	22°C / 15°C	22°C / 14°C	9days (62 mm) Wet	10.3h Excellent	69% Muggy	7.2 Very High	Good	View Details
November best	23°C / 17°C	24°C / 17°C	8days (58 mm) Wet	10.9h Excellent	70% Muggy	7.7 Very High	Excellent	View Details
December	25°C / 19°C	27°C / 19°C	9days (58 mm) Wet	11.2h Excellent	71% Muggy	8.4 Very High	Excellent	View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaComfortable walking shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Sydney?

September is typically good for visiting Sydney, with average highs of 20°C (68°F) and around 6 rainy days. Sydney, Australia in September has mild conditions, with highs averaging 20°C (68°F) and noticeably cooler mornings. Sea

Does it rain a lot in Sydney in September?

Sydney typically sees around 6 rainy days in September with 43 mm (1.7 in) of total rainfall. An umbrella should suffice.

Does it get cold at night in Sydney in September?

Nights in Sydney during September are cool at around 12°C (54°F). Bring a jacket or sweater for evenings.

What should I pack for Sydney in September?

With highs of 20°C (68°F) and lows of 12°C (54°F) in September, we recommend: Umbrella, Comfortable walking shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Sydney?

September is not the most favourable month weather-wise in Sydney. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Sydney in September?

The average UV index in Sydney during September is 6 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.

How many hours of daylight are there in Sydney in September?

Sydney gets approximately 12 hours of daylight per day in September, with around 10 hours of sunshine.

Does it snow in Sydney in September?

Snow is uncommon in Sydney during September based on 10-year climate averages.

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