Weather in Fortaleza in September 2025
- September is usually the driest month of the year in Fortaleza
Average weather
Average temperature in Fortaleza in September
Going from a maximum of +31°C during the day to a minimum of +25°C during the night, the temperature in September averages around +30°C.
The average maximum temperature goes up 33% by the end of the month, compared with the beginning of the month, from +28°C to +30°C.
Is Fortaleza warm or cold in September?
Fortaleza is typically warm in September.
Maximum temperatures go up compared to the previous month from +29°C to +29°C. The minimum temperature also goes up from +25°C to +25°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Fortaleza:
Water temperature in Fortaleza in September
Water in Fortaleza in September is Warm. It varies from +26°C to +27°C, with an average of +27°C. This is almost similar to the air temperature, which averages +29°C.
The water temperature in September is one of the coldest of the entire year:
Can you swim in Fortaleza in September?
Climate in Fortaleza in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +29°C | +29°C | +29°C | ||||
| Min. temperature | ||||||
| +22°C | +23°C | +24°C | ||||
| Max. temperature | ||||||
| +33°C | +34°C | +35°C | ||||
| Rainfall | ||||||
| 4 mm | 2 mm | 3 mm | ||||
| Wind | ||||||
| 4 m/s | 5 m/s | 5 m/s | ||||
| Avg. water temperature | ||||||
| +27°C | +27°C | +27°C | ||||
| Humidity | ||||||
| 71% | 70% | 70% | ||||
| Air pressure | ||||||
| 1013 HPa | 1012 HPa | 1011 HPa | ||||
| Sunny days | ||||||
| 13 | 11 | 7 | ||||
| Cloudy days | ||||||
| 13 | 15 | 18 | ||||
| Rainy days | ||||||
| 5 | 4 | 6 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as great as in August. The temperature levels stay the same in the area of +29°C for average maximum temperature during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 4 mm to 2 mm. It feels drier, as humidity decreases from 71% to 70%. Winds are stronger in comparison to August, going up from 4 m/s to 5 m/s on average. The days becoming less sunny, going from 13 sunny days in August to 11 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 6 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Fortaleza is gradually increasing during September, going from 5 m/s to 7 m/s over the course of the month.
Rain
How was the weather last September in Fortaleza?
Climate Change over Years
The climate in Fortaleza in September has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+28°C) and the highest in 2020 (+31°C). The driest year was 1993 with only 236 mm of rainfall, and the wettest year was 2009 with 1739 mm.
FAQ
Is September a good time to visit Fortaleza?
Can you sunbathe in Fortaleza in September?
Can you swim in Fortaleza in September?
Is Fortaleza rainy in September?
Is it sunny in Fortaleza in September?
Other cities in Brazil
Monthly weather in Fortaleza
Source of the data
For this page, we’ve looked at the typical weather in Fortaleza, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.