Weather in Sao Paulo 🇧🇷
Monthly weather averages & travel planning
September
Avg Temp
24°C
Rain Days
10 days
Sun Hours
9 hrs
Humidity
78%
South America › 🇧🇷 Brazil › Sao Paulo
Updated: March 2026
Is September a Good Time to Visit Sao Paulo?
6/10
Good
September is a good time to visit Sao Paulo (6/10). With 9 daily sunshine hours and only 10 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 7th sunniest of the year in Sao Paulo. Culture-focused travellers and those who prefer lighter crowds will find September a practical choice, with prices running lower than peak February without sacrificing all the good weather. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Sao Paulo'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:23°C avg high
The single most important thing to know about visiting Sao Paulo in September: conditions are genuinely cooperative, with 24°C highs and only 10 wet days making this one of the more straightforward months to plan around. Precipitation totals 83mm for the month, spread across roughly 10 days, and 9 sunshine hours per day give you a reliable window for outdoor plans.
24°C
75°F
Avg High
15°C
59°F
Avg Low
10 days
83 mm total
Rain Days
9h
per day avg
Sunshine
78%
Humid
Humidity
Temperature in Sao Paulo in September
The 9°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. At 78% humidity, the 24°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 18 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 75°F average high, 59°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 Sao Paulo in September
Morning15°CBefore the day warms up
Afternoon24°CPeak daytime temperature
Evening18°CAfter sunset cools down
Packing for Sao Paulo in September means dressing for 24°C days and 15°C evenings. A light cotton tee with a casual overshirt works well at 24°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 15°C, a modest 9°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 10 potential rainy days. At 78% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.
Local tip: Layers are more practical than a single heavy garment in Sao Paulo. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.
Events in Sao Paulo in September
September has no major festivals or public holidays in Sao Paulo, 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 Sao Paulo in September
Based on 24°C average highs and 10 rainy days
- Light layers for morning and evening
- Breathable T-shirts and comfortable trousers
- UV-protective sunglasses
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- SPF 30+ sunscreen
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Sao Paulo in September
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 24°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 Sao Paulo mild in September?
September marks the transition into warmer conditions in Sao Paulo, as the sun angle climbs and day length extends. Temperatures averaging 24°C by day and 15°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 24 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: Sao Paulo in September has a freshness and energy that peak-summer heat tends to mute. The warmth is sufficient for outdoor dining and long walking days. 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
Sao Paulo in September
In September, Sao Paulo experiences average highs of 24°C (75°F) and lows of 15°C (59°F). Expect around 10 rainy days and 9 hours of sunshine per day, with humidity averaging 78%. The 9°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.
Sao Paulo typically sees 10 rainy days in September, with total precipitation of around 83mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Sao Paulo typically sees 4-6 fewer rain days than September.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Sao Paulo in September. Daytime temperatures of 24°C are pleasant, but the evening drop to 15°C means a jacket is essential if you plan to be out after dark. With 10 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, September is an excellent time to visit Sao Paulo. With 9 daily sunshine hours and only 10 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 24°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 Sao Paulo in September is 24°C (75°F), and the average low is 15°C (59°F). The mean daily temperature is approximately 20°C (67°F). The day-to-night range of 9°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 Sao Paulo is generally April. April offers the most sunshine at 9 hours per day and only 10 rainy days. Average temperatures reach 24°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around April gives you the best chance of dry, bright weather.
September is shoulder or low season in Sao Paulo, meaning fewer tourists and generally lower prices than peak months. With 9 sunshine hours and 10 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, Sao Paulo suits a range of activities thanks to mild temperatures around 24°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 9 hours of sunshine, parks and waterfront walks are particularly enjoyable.
September ranks 7th sunniest of the year in Sao Paulo, with an average 9 daily sunshine hours. The driest months are June, July, and August. February is the hottest month (27°C avg high); May is the coolest (22°C). From here, temperatures rise 1°C into October. Compared to last month (August: 23°C high, 5 rain days), September is warmer and wetter. September sits in the middle of the annual sunshine ranking for Sao Paulo, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 26°C | 19°C | 23 | 9h | View |
| February | 27°C | 19°C | 20 | 10h | View |
| March | 26°C | 19°C | 20 | 9h | View |
| April | 24°C | 17°C | 10 | 9h | View |
| May | 22°C | 14°C | 8 | 8h | View |
| June | 22°C | 13°C | 5 | 8h | View |
| July | 22°C | 12°C | 5 | 8h | View |
| August | 23°C | 13°C | 5 | 9h | View |
| September | 24°C | 15°C | 10 | 9h | View |
| October | 25°C | 16°C | 14 | 9h | View |
| November | 25°C | 17°C | 16 | 9h | View |
| December | 26°C | 18°C | 20 | 10h | View |
January
23 rain days, 9h sun
26°19°
February
20 rain days, 10h sun
27°19°
March
20 rain days, 9h sun
26°19°
April
10 rain days, 9h sun
24°17°
May
8 rain days, 8h sun
22°14°
June
5 rain days, 8h sun
22°13°
July
5 rain days, 8h sun
22°12°
August
5 rain days, 9h sun
23°13°
September
10 rain days, 9h sun
24°15°
October
14 rain days, 9h sun
25°16°
November
16 rain days, 9h sun
25°17°
December
20 rain days, 10h sun
26°18°
Other Months in Sao Paulo
Plan Your Trip to Sao Paulo
Data Sources for Sao Paulo
Climate normals represent 30-year averages (1991-2020). Individual years may vary.