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September Weather in Belen, Bolivia

Last updated: August 22, 2025

In September, the average temperature in Belen, Bolivia hovers around 7°C (45°F), with fluctuations that can dip to a chilly -5°C (24°F) and peak at a pleasant 19°C (66°F). Expect about 33 mm (1.3 in) of precipitation spread over 9 days, contributing to an average humidity of 70%. Whether you’re exploring the outdoors or cozying up inside, be prepared for the characteristic charm of this season!

September Temperature in Belen

In September in Belen, the average temperature is 7°C (45°F). Maximums can reach 19°C (66°F), while minimums can drop to as low as -5°C (24°F). This variability means travelers should be prepared for both mild days and chilly nights.

September Weather in Belen: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Belen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belen, September typically has an average temperature of 7°C (45°F), with highs reaching up to 19°C (66°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec474746464441414345474948
Data source: Temperature data for Belen generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Belen

In Belen in September, the precipitation amount is 33 mm (1.3 in) over the course of 9 days.

September Precipitation Trends in Belen

The chart displays monthly precipitation patterns in Belen, 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 Belen, September typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec117155121432213916335362140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Belen

In Belen in September, humidity is 70%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making travel feel more uncomfortable as the cool air mixes with the moisture, creating a heavy atmosphere that can leave you feeling sluggish and weary.

September Average Humidity in Belen

This chart illustrates the average monthly humidity levels in Belen, 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 Belen is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%91%89%87%79%64%62%70%75%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Belen

In Belen in September, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Belen.

Maximum UV Index Levels in Belen for September

The chart shows the monthly maximum UV Index (UVI) for Belen 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 Belen typically reaches 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec182117161310111416181919
Data source: Belen 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 Belen Compares to Other Months

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

This table compares monthly weather conditions in Belen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)117 mm (4.6 inches)91%extreme
February Weather8°C (47°F)155 mm (6.1 inches)91%extreme
March Weather8°C (46°F)121 mm (4.7 inches)91%extreme
April Weather8°C (46°F)43 mm (1.7 inches)88%extreme
May Weather6°C (44°F)22 mm (0.9 inches)87%extreme
June Weather5°C (41°F)13 mm (0.5 inches)79%very high
July Weather5°C (41°F)9 mm (0.3 inches)64%extreme
August Weather6°C (43°F)16 mm (0.6 inches)62%extreme
September Weather7°C (45°F)33 mm (1.3 inches)70%extreme
October Weather8°C (48°F)53 mm (2.1 inches)75%extreme
November Weather10°C (50°F)62 mm (2.5 inches)84%extreme
December Weather9°C (48°F)140 mm (5.5 inches)87%extreme

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