Weather in Sydney 🇦🇺
Monthly weather averages & travel planning
September
Avg Temp
19°C
Rain Days
6 days
Sun Hours
11 hrs
Humidity
70%
Oceania › 🇦🇺 Australia › Sydney
Updated: March 2026
Is September a Good Time to Visit Sydney?
7/10
Good
September is a good time to visit Sydney (7/10). With 11 daily sunshine hours and only 6 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 2nd sunniest of the year in Sydney. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak January without sacrificing all the good weather. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Sydney's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs August:17°C avg high
September sits at a particular moment in Sydney's seasonal arc. Temperatures average 19°C during the day, placing this month in a comfortable middle band, noticeably warmer than the depths of winter but without midsummer extremes. Against the seasonal backdrop, 6 rainy days and 11 sunshine hours per day help calibrate expectations for what actually awaits on the ground.
19°C
66°F
Avg High
11°C
52°F
Avg Low
6 days
41 mm total
Rain Days
11h
per day avg
Sunshine
70%
Moderate
Humidity
Temperature in Sydney in September
The 8°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 70%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 19 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 66°F average high, 52°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Sydney in September
Morning11°CBefore the day warms up
Afternoon19°CPeak daytime temperature
Evening14°CAfter sunset cools down
Packing for Sydney in September means dressing for 19°C days and 11°C evenings. A light cotton tee with a casual overshirt works well at 19°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 11°C, a modest 8°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues.
Local tip: Layers are more practical than a single heavy garment in Sydney. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.
Events in Sydney in September
September has no major festivals or public holidays in Sydney, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Sydney in September
Based on 19°C average highs and 6 rainy days
- Light jacket or cardigan for cooler evenings
- Mix of short and long-sleeve layers
- Comfortable walking shoes with good arch support
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Sydney in September
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 19°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)September is reliably dry enough for rural day trips without weather risk
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
- Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Sydney mild in September?
September marks the transition into warmer conditions in Sydney, as the sun angle climbs and day length extends. Temperatures averaging 19°C by day and 11°C overnight reflect a city shaking off winter: the morning air still carries a cool edge, but afternoons are noticeably warmer than even four weeks prior. At 34 degrees south latitude, spring is one of the most dynamic periods in the annual cycle, with weekly temperature changes that can be larger than the month-to-month shifts of summer. This volatility is part of the appeal: Sydney in September has a freshness and energy that peak-summer heat tends to mute. Layers remain essential, but there are reliable pockets of warmth that reward patience. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Sydney in September
In September, Sydney experiences average highs of 19°C (66°F) and lows of 11°C (52°F). Expect around 6 rainy days and 11 hours of sunshine per day, with humidity averaging 70%. The 8°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.
Sydney typically sees 6 rainy days in September, with total precipitation of around 41mm. This makes September one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Sydney typically sees 4-6 fewer rain days than September.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Sydney in September. Daytime temperatures of 19°C are pleasant, but the evening drop to 11°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 6 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, September is an excellent time to visit Sydney. With 11 daily sunshine hours and only 6 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 19°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Sydney in September is 19°C (66°F), and the average low is 11°C (52°F). The mean daily temperature is approximately 15°C (59°F). The day-to-night range of 8°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Sydney is generally January. January offers the most sunshine at 11 hours per day and only 9 rainy days. Average temperatures reach 26°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around January gives you the best chance of dry, bright weather.
September is shoulder or low season in Sydney, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 6 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In September, Sydney suits a range of activities thanks to mild temperatures around 19°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.
September ranks 2nd sunniest of the year in Sydney, with an average 11 daily sunshine hours. The driest months are August, July, and September. January is the hottest month (26°C avg high); June is the coolest (16°C). From here, temperatures rise 2°C into October. Compared to last month (August: 17°C high, 5 rain days), September is warmer and wetter. September is among the top three sunniest months to visit Sydney.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 26°C | 19°C | 9 | 11h | View |
| February | 25°C | 19°C | 10 | 10h | View |
| March | 24°C | 18°C | 10 | 10h | View |
| April | 21°C | 15°C | 8 | 10h | View |
| May | 19°C | 12°C | 7 | 9h | View |
| June | 16°C | 10°C | 8 | 8h | View |
| July | 16°C | 9°C | 6 | 9h | View |
| August | 17°C | 9°C | 5 | 9h | View |
| September | 19°C | 11°C | 6 | 11h | View |
| October | 21°C | 14°C | 8 | 11h | View |
| November | 23°C | 16°C | 9 | 11h | View |
| December | 24°C | 18°C | 9 | 11h | View |
January
9 rain days, 11h sun
26°19°
February
10 rain days, 10h sun
25°19°
March
10 rain days, 10h sun
24°18°
April
8 rain days, 10h sun
21°15°
May
7 rain days, 9h sun
19°12°
June
8 rain days, 8h sun
16°10°
July
6 rain days, 9h sun
16°9°
August
5 rain days, 9h sun
17°9°
September
6 rain days, 11h sun
19°11°
October
8 rain days, 11h sun
21°14°
November
9 rain days, 11h sun
23°16°
December
9 rain days, 11h sun
24°18°
Other Months in Sydney
Plan Your Trip to Sydney
Data Sources for Sydney
Climate normals represent 30-year averages (1991-2020). Individual years may vary.