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Ilha Grande Weather in September
September in Ilha Grande typically sees daytime highs of 24°C (75°F) and nighttime lows of 19°C (66°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Ilha Grande in September
Climate statistics over the past 30 years suggest around 11 days of rain, with 104 mm (4.1 in) average for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Ilha Grande in September
In September, Ilha Grande gets high temperatures, with highs of 24°C (75°F). Nights cool to around 19°C (66°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights drop to around 19°C (66°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.For Ilha Grande itself, May, June, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Ilha Grande Temperature in September
Min Temperature
19°C (66°F)
Max Temperature
24°C (75°F)
Chance of Rain
37%
Precipitation
104 mm (4.1 in)
Rainy days
11 days
Ilha Grande Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ilha Grande - and find the best time to visit.
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Ilha Grande typically stay consistent throughout September, with daily highs averaging around 24°C (75°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in September
Historical weather records for Ilha Grande in September
Browse day-by-day weather records for Ilha Grande spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ilha Grande historical weather extremes in September
Based on 22 years of weather observations in Ilha Grande between 2004 and 2026, these are the recorded extremes.
- The warmest day in September was on September 4, 2008, with a maximum of 39°C (102°F).
- On September 30, 2004, Ilha Grande saw its coldest September day with temperatures maxing out at 16°C (61°F).
- Ilha Grande registered its coldest September night on September 4, 2011, with temperatures dropping to 10°C (50°F).
Best Places in Brazil in September
Find out more about the weather in Brazil and which places have the best travel conditions in this month. See all of Brazil in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Ilha Grande in September
For Ilha Grande in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.
What To Do in Ilha Grande in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping6/10 -
Outdoor sports9/10
Ilha Grande 3-Day Forecast
More climate data for Ilha Grande
See the full Ilha Grande climate overview or explore weather in Brazil.
Popular in September
Where to go in September - average daytime high across popular destinations.
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