Fortaleza weather in September
In September, Fortaleza has an average high of 30 °C85 °F and an average low of 25 °C76 °F, with about 3 mm0.1 in of precipitation. It is the 9th warmest month of the year and the driest.
How September compares with other months
Compared with August, September is about the same temperature and drier by 6 mm0.2 in. Compared with October, September is about the same temperature. Daylight lasts about 12.1 hours around the middle of the month. Average relative humidity is 72% and the average cloud amount 28%.
Is September a good time to visit Fortaleza?
Yes — September is one of the most comfortable months to visit Fortaleza by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in September
For Fortaleza in September, pack light summer clothes such as T-shirts, shorts or light dresses.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Fortaleza | 3085 | 2576 | 30.1 |
| Maracanaú | 3493 | 2272 | 40.2 |
| Itapipoca | 3392 | 2272 | 20.1 |
| Sobral | 3798 | 2272 | 10.0 |
| Mossoró | 3595 | 2272 | 30.1 |
| Parnaíba | 3596 | 2374 | 40.2 |
| Juazeiro do Norte | 3697 | 2069 | 60.2 |
| São Gonçalo do Amarante | 3289 | 2170 | 281.1 |
| Natal | 2781 | 2577 | 321.3 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Sobral, Mossoró, Parnaíba and Juazeiro do Norte; cooler: Natal.
Other months in Fortaleza
- January29 °C85 °F / 26 °C78 °F
- February29 °C84 °F / 26 °C79 °F
- March29 °C84 °F / 26 °C79 °F
- April28 °C83 °F / 26 °C79 °F
- May29 °C84 °F / 26 °C78 °F
- June28 °C83 °F / 25 °C77 °F
- July29 °C83 °F / 24 °C76 °F
- August29 °C84 °F / 24 °C76 °F
- September30 °C85 °F / 25 °C76 °F
- October30 °C86 °F / 25 °C77 °F
- November30 °C86 °F / 26 °C78 °F
- December30 °C86 °F / 26 °C79 °F
Frequently asked questions
How warm is Fortaleza in September?
In September the average high in Fortaleza is 30 °C (85 °F) and the average low is 25 °C (76 °F).
Does it rain a lot in Fortaleza in September?
On average about 3 mm (0.1 in) of precipitation falls in September; it ranks 12th of the 12 months.
Is September the warmest month in Fortaleza?
No. The warmest month in Fortaleza is November, with an average high of 30 °C (86 °F). The coldest month is August, with an average low of 24 °C (76 °F).
How long is the day in Fortaleza in September?
In the middle of September the day in Fortaleza lasts about 12.1 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Fortaleza in September?
The average relative humidity in September is about 72%. Combined with warm days, it can feel muggy.
How cloudy is Fortaleza in September?
On average about 28% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.