October 21 is generally a great time to visit Sydney. While there is a slight chance of rain (19%), showers are usually brief. Expect comfortable 22°C weather. Take advantage of the off-peak calm in Sydney to see the sights without the usual crowds.
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Essential Travel Info for Sydney
Currency
AUD
$ Australian dollar
Language
English
Driving
Left side
Connect
See the Sydney district guides for local...
Safety
High Safety
GPI: 1.565
Sydney Weather Forecast for October 21
"Mild & Comfortable. Expect average highs of 22°C. 19% chance of rain."
What to Wear in Sydney in October
Based on historical data for October 21, Sydney typically experiences temperatures between 13.9°C and 22°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (19% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sydney
Smart Suitcase
- Light Jacket
- Long Pants
Average High
22°C
Daytime Peak
Average Low
13.9°C
Nighttime Low
Feels Like
22.3°C
☀️ Feels accurate
Rain Chance
19%
Avg 1.2mm if it rains
Cloud Cover
49%
Overcast
Pressure
1016.4 hPa
Medium volatility
Sydney Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 19:00
Type I-II
🔴 16 min to burn
Type III-IV
🟡 24 min to burn
Type V-VI
🟢 40 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.9°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Australia
Flight Traffic
Quiet
38/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~364
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sydney
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:08
☀️ Noon
12:41
🌇 Sunset
19:13
⏱️ Daylight
13h 5m
Wind Speed
21.8 km/h
Moderate wind
Sunshine
10.4 hrs
Direct Sun (Cloud-free)
Humidity
73%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sydney
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Sydney
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sydney on October 21 averages 22°C with a 19% precipitation probability. Wedding/Outdoor Event Score: 97/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sydney Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
October 28
22°C • 18% rain
Score
99
October 15
21.6°C • 19% rain
Score
98
October 16
21.6°C • 19% rain
Score
98
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (October 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Sydney Worth Visiting on October 21?
Planning a trip to Sydney on October 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 22°C with a 19% historical precipitation risk.
✈️ Travel Logistics: Approximately 364 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 6 vaccinations are recommended for Australia, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 19.5°C (refreshing tonic). Wave conditions are generally surfers only with heights around 1.44m.
📊 Historical Extremes: The hottest October 21 recorded in the last 30 years saw temperatures hit 25.4°C in 2016, while the coldest dropped to 9.6°C in 2019.