Monthly climate guide
São Paulo weather in September
Expect hot weather in São Paulo in September: afternoons reach about 28°C (82°F), while nights drop to around 14°C (57°F). Around 53 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are 3°C warmer than August and about the same as October.
What stands out in September
- São Paulo is usually about 3°C warmer than Santos, 50 km away, in September.
- September is São Paulo's third warmest month.
- In São Paulo, September is early spring — the seasons are reversed south of the equator.
- Afternoons and nights feel like different seasons, roughly 14°C apart.
Avg high
28°C
82°F
Avg low
14°C
57°F
Rainfall
53 mm
some rain
Humidity
71%
relative
Sky
56%
cloud · often cloudy
São Paulo weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 28°C / 82°F | 19°C / 66°F | 203 mm | 82% | 74% |
| February | 28°C / 82°F | 19°C / 65°F | 172 mm | 81% | 68% |
| March | 27°C / 80°F | 18°C / 64°F | 144 mm | 85% | 69% |
| April | 26°C / 78°F | 16°C / 61°F | 74 mm | 83% | 58% |
| May | 23°C / 74°F | 13°C / 56°F | 57 mm | 83% | 59% |
| June | 22°C / 72°F | 12°C / 54°F | 78 mm | 82% | 58% |
| July | 23°C / 73°F | 11°C / 52°F | 45 mm | 78% | 47% |
| August | 25°C / 76°F | 12°C / 53°F | 36 mm | 74% | 48% |
| September | 28°C / 82°F | 14°C / 57°F | 53 mm | 71% | 56% |
| October | 29°C / 84°F | 16°C / 60°F | 89 mm | 73% | 69% |
| November | 27°C / 81°F | 16°C / 61°F | 137 mm | 77% | 75% |
| December | 28°C / 83°F | 18°C / 65°F | 150 mm | 78% | 75% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- A small travel umbrella, just in case
Is September a good time to visit São Paulo?
Our São Paulo guide recommends: April to June or August to September, in the milder, drier shoulder months.
São Paulo's food scene is considered one of the best in South America — it's worth building an itinerary around restaurants, not just sights.
Best time to visit São Paulo →Other Brazil cities in September
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São Paulo weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/brazil/sao-paulo/september
<a href="https://weathercompare.eu/weather/brazil/sao-paulo/september">São Paulo weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/brazil/sao-paulo" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="São Paulo weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/brazil/sao-paulo/september">São Paulo weather in September</a> – WeatherCompare</p>
São Paulo in September: quick answers
Is September a good time to visit São Paulo?
Yes. September is one of the best months for São Paulo, with highs around 28°C and about 53 mm of rain.
How warm is São Paulo in September?
Average highs are about 28°C (82°F) and average lows about 14°C (57°F), based on 10 years of daily data.
Does it rain a lot in São Paulo in September?
São Paulo typically gets around 53 mm of rain in September — some rain.
When is the best time to visit São Paulo?
April to June or August to September, in the milder, drier shoulder months.
Figures are long-term averages for the area around São Paulo (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.