Sao Paulo Weather in September

🇧🇷 Brazil

24°C

High

15°C

Low

Rain Days

Sunshine

78%

Humidity

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

Avg High

15°C

Avg Low

10 days

Rain Days

Sunshine

78%

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 in September

Monthly Precipitation (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.

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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

Other Months in Sao Paulo

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Sao Paulo

Best Time to Visit Sao Paulo Sao Paulo vs Rio de Janeiro in September

Data Sources for Sao Paulo

Sao Paulo on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.