September 12 is statistically one of the best days of the year in Santiago. With minimal rain risk (11%) and pleasant highs of 18°C, it's ideal for outdoor adventures. Take advantage of the off-peak calm in Santiago to see the sights without the usual crowds.
View the full calendar
Essential Travel Info for Santiago
Currency
CLP
$ Chilean peso
Language
Spanish
Driving
Right side
Connect
If you wish to mail a letter or postcard...
Safety
High Safety
GPI: 1.84
Santiago Weather Forecast for September 12
"Mild & Comfortable. Expect average highs of 18°C. 11% chance of rain."
What to Wear in Santiago in September
Based on historical data for September 12, Santiago typically experiences temperatures between 6.5°C and 18°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (11% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Santiago
Smart Suitcase
- Light Jacket
- Long Pants
Average High
18°C
Daytime Peak
Average Low
6.5°C
Nighttime Low
Feels Like
18°C
🌤️ Feels accurate
Rain Chance
11%
Avg 0.5mm if it rains
Cloud Cover
42%
Overcast
Pressure
1018.3 hPa
Low volatility
Santiago Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 75% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
07:00 - 10:00
16:00 - 19:00
Type I-II
🔴 22 min to burn
Type III-IV
🟡 33 min to burn
Type V-VI
🟢 55 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
11.8°C
Pleasant
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Chile
Flight Traffic
Quiet
36/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~86
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Santiago
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:47
☀️ Noon
13:40
🌇 Sunset
19:33
⏱️ Daylight
11h 45m
Wind Speed
9.8 km/h
Light breeze
Sunshine
9.8 hrs
Direct Sun (Cloud-free)
Humidity
67%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Santiago
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 Santiago
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Santiago on September 12 averages 18°C with a 11% precipitation probability. Wedding/Outdoor Event Score: 96/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Santiago Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 15
18.9°C • 10% rain
Score
99
September 16
19°C • 12% rain
Score
99
September 14
18.7°C • 9% rain
Score
98
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 12) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Santiago Worth Visiting on September 12?
Planning a trip to Santiago on September 12? 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 18°C with a 11% historical precipitation risk.
✈️ Travel Logistics: Approximately 86 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Chile, including COVID-19.
📊 Historical Extremes: The hottest September 12 recorded in the last 30 years saw temperatures hit 24.6°C in 2025, while the coldest dropped to 6.3°C in 2017.