September weather forecast
Londrina, Brazil

September’s weather in Londrina exhibits indications of the approaching summer. The increase in maximum temperatures and daylight hours signal a return to the warmer and sunnier months. While increasing humidity is also notable, it does not yet reach levels observed at the year's outset. Rainfall begins to ascend again, but the number of rainfall days remains steady, reflecting scattered showers rather than prolonged periods of rain. An upsurge in wind speed accompanies transitioning weather and completes September's idyllic prelude to the characteristic summer of Londrina.

Temperature

The onset of September in Londrina manifests an average high-temperature of a still warm 27.7°C (81.9°F), demonstrating a minor variation from the preceding month. In Londrina, September nights cool down to an average of 15.8°C (60.4°F).

Heat index

The heat index value for September is estimated at a tropical 30°C (86°F). If one endures exposure and continues to be active, it might result in tiredness and heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.

Humidity

September is the least humid month in Londrina, Brazil, with an average relative humidity of 67%.

Rainfall

In Londrina, in September, during 9.9 rainfall days, 55mm (2.17") of precipitation is typically accumulated. In Londrina, during the entire year, the rain falls for 185.2 days and collects up to 1015mm (39.96") of precipitation.

Daylight

The average length of the day in September is 11h and 58min.
On the first day of September in Londrina, Brazil, sunrise is at 06:34 and sunset at 18:14. On the last day of the month, sunrise is at 06:05 and sunset at 18:23 -03.

Sunshine

In Londrina, the average sunshine in September is 9h.

UV index

January through March, August through December, with an average maximum UV index of 6, are months with the highest UV index in Londrina. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 6 translates into these guidelines:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.