nomadseason

September Weather in Grand-Santi, French Guiana

Last updated: August 23, 2025

In September, the average temperature in Grand-Santi, French Guiana hovers around 28°C (82°F), offering a warm and inviting climate. Temperatures can vary, with a minimum of 21°C (69°F) and a maximum of 38°C (101°F) on the hottest days. During this period, expect about 76 mm (3.0 in) of precipitation spread across 12 days, contributing to an average humidity level of 62%. Perfect for outdoor adventures, just don’t forget your umbrella!

September Temperature in Grand-Santi

In September in Grand-Santi, the average temperature is 28°C (82°F). Maximums can reach 38°C (101°F), while minimums can dip to as low as 21°C (69°F). This climate makes Grand-Santi a great destination for travelers seeking warm weather and plenty of sunshine.

September Weather in Grand-Santi: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Grand-Santi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grand-Santi, September typically has an average temperature of 28°C (82°F), with highs reaching up to 38°C (101°F) and lows dropping to around 21°C (69°F).
JanFebMarAprMayJunJulAugSepOctNovDec777879787878788082828178
Data source: Temperature data for Grand-Santi generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Grand-Santi

In Grand-Santi in September, the total precipitation amount is 76 mm (3.0 in), occurring over the course of 12 days.

September Precipitation Trends in Grand-Santi

The chart displays monthly precipitation patterns in Grand-Santi, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Grand-Santi, September typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1381051292904613172481157638108213
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Grand-Santi

In Grand-Santi in September, humidity is 62%. With an average temperature of 28°C (82°F), this humidity feels like walking through a warm, dense fog, making outdoor activities a bit more challenging but still enjoyable for those who appreciate the tropical atmosphere.

September Average Humidity in Grand-Santi

This chart illustrates the average monthly humidity levels in Grand-Santi, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Grand-Santi is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%66%66%66%68%86%76%65%62%63%74%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grand-Santi

In Grand-Santi in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Grand-Santi.

Maximum UV Index Levels in Grand-Santi for September

The chart shows the monthly maximum UV Index (UVI) for Grand-Santi in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Grand-Santi typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131516161412121313131312
Data source: Grand-Santi September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Grand-Santi Compares to Other Months

Weather in Grand-Santi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grand-Santi, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Grand-Santi, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (78°F)137 mm (5.4 inches)70%extreme
February Weather25°C (78°F)105 mm (4.1 inches)66%extreme
March Weather26°C (79°F)129 mm (5.1 inches)66%extreme
April Weather26°C (78°F)290 mm (11.4 inches)66%extreme
May Weather25°C (78°F)461 mm (18.2 inches)68%extreme
June Weather26°C (78°F)317 mm (12.5 inches)86%extreme
July Weather26°C (79°F)248 mm (9.8 inches)76%extreme
August Weather27°C (80°F)115 mm (4.5 inches)65%extreme
September Weather28°C (82°F)76 mm (3.0 inches)62%extreme
October Weather28°C (83°F)38 mm (1.5 inches)63%extreme
November Weather27°C (81°F)108 mm (4.3 inches)74%extreme
December Weather26°C (78°F)213 mm (8.4 inches)79%extreme

Compare Grand-Santi's Climate with Cities Worldwide