August 21 is generally a great time to visit Sao Paulo. While there is a slight chance of rain (15%), showers are usually brief. Expect comfortable 24°C weather. Lower tourist interest in Sao Paulo right now translates to better deals and a more local feel.
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Essential Travel Info for Sao Paulo
Currency
BRL
R$ Brazilian real
Language
Portuguese
Driving
Right side
Safety
Moderate Safety
GPI: 2.465
Sao Paulo Weather Forecast for August 21
"Mild & Comfortable. Expect average highs of 23.9°C. 15% chance of rain."
What to Wear in Sao Paulo in August
Based on historical data for August 21, Sao Paulo typically experiences temperatures between 13.2°C and 23.9°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (15% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Sao Paulo
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
23.9°C
Daytime Peak
Average Low
13.2°C
Nighttime Low
Feels Like
24.5°C
☀️ Feels accurate
Rain Chance
15%
Avg 0.6mm if it rains
Cloud Cover
50%
Overcast
Pressure
1019.6 hPa
Medium volatility
Sao Paulo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
~ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 42 min to burn
Type III-IV
🟡 63 min to burn
Type V-VI
🟢 105 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19°C
Noticeable
Heat Stress
Low
No heat warning
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Brazil
Flight Traffic
Quiet
28/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~452
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Sao Paulo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:28
☀️ Noon
12:11
🌇 Sunset
17:53
⏱️ Daylight
11h 24m
Wind Speed
16 km/h
Gentle breeze
Sunshine
8.3 hrs
Direct Sun (Cloud-free)
Humidity
74%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Sao Paulo
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Sao Paulo
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
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Sao Paulo on August 21 averages 23.9°C with a 15% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Sao Paulo Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (August 21) in other destinations
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📍 Is Sao Paulo Worth Visiting on August 21?
Planning a trip to Sao Paulo 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 23.9°C with a 15% historical precipitation risk.
✈️ Travel Logistics: Approximately 452 landing slots available daily during this period, indicating peak tourist activity.
💉 Health Advisory: 9 vaccinations are recommended for Brazil, including COVID-19.
📊 Historical Extremes: The hottest August 21 recorded in the last 30 years saw temperatures hit 30°C in 2025, while the coldest dropped to 8.5°C in 2020.