August 21 is generally a great time to visit Santiago. While there is a slight chance of rain (24%), showers are usually brief. Expect comfortable 16°C weather. It's a lively time to explore Santiago, with most attractions operating at full capacity.
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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 August 21
"Mild & Comfortable. Expect average highs of 15.7°C. 24% chance of rain."
What to Wear in Santiago in August
Based on historical data for August 21, Santiago typically experiences temperatures between 5.5°C and 15.7°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (24% 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
15.7°C
Daytime Peak
Average Low
5.5°C
Nighttime Low
Feels Like
15.7°C
🌤️ Feels accurate
Rain Chance
24%
Avg 1.6mm if it rains
Cloud Cover
53%
Overcast
Pressure
1018.3 hPa
Medium volatility
Santiago Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 88% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 47 min to burn
Type III-IV
🟡 71 min to burn
Type V-VI
🟢 118 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
10°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
Busy
73/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~175
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Santiago
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
08:15
☀️ Noon
13:47
🌇 Sunset
19:18
⏱️ Daylight
11h 3m
Wind Speed
8.9 km/h
Light breeze
Sunshine
8.2 hrs
Direct Sun (Cloud-free)
Humidity
69%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for Santiago
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Santiago
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🔴 Very Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
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 August 21 averages 15.7°C with a 24% precipitation probability. Wedding/Outdoor Event Score: 82/100."
— 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
August 27
17.1°C • 14% rain
Score
94
August 26
17.1°C • 12% rain
Score
93
August 25
16.7°C • 13% rain
Score
92
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (August 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Santiago Worth Visiting on August 21?
Planning a trip to Santiago on August 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 15.7°C with a 24% historical precipitation risk.
✈️ Travel Logistics: Approximately 175 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 August 21 recorded in the last 30 years saw temperatures hit 22.3°C in 2016, while the coldest dropped to 1.8°C in 2024.