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September Weather in La Union, Guatemala

Last updated: August 23, 2025

In La Union, Guatemala, the average temperature in September hovers around 24°C (76°F). You can expect a minimum temperature of 18°C (65°F) and a maximum of 33°C (92°F). During this month, precipitation totals approximately 275 mm (10.8 in) spread over 28 days, contributing to an average humidity of 71%.

September Temperature in La Union

In September in La Union, the average temperature is 24°C (76°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 18°C (65°F). It's the perfect time for travelers to enjoy pleasant weather while exploring all that La Union has to offer.

September Weather in La Union: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in La Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In La Union, September typically has an average temperature of 24°C (76°F), with highs reaching up to 33°C (92°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec697172777877757576757169
Data source: Temperature data for La Union 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 La Union

In La Union in September, the precipitation amount is 275 mm (10.8 in) over the course of 28 days.

September Precipitation Trends in La Union

The chart displays monthly precipitation patterns in La Union, 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 La Union, September typically receives around 275 mm (10.8 inches) of precipitation spread over approximately 28 days.
JanFebMarAprMayJunJulAugSepOctNovDec8675795621332324126627528618098
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in La Union

In La Union in September humidity is 71%. With an average temperature of 24°C (76°F), this humidity feels like a warm, tropical embrace, making it essential to stay hydrated while exploring, as the air is thick and can leave you feeling sticky and slightly tired after even short excursions.

September Average Humidity in La Union

This chart illustrates the average monthly humidity levels in La Union, 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 La Union is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%72%61%53%51%52%58%63%71%79%79%74%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in La Union

In La Union 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 La Union.

Maximum UV Index Levels in La Union for September

The chart shows the monthly maximum UV Index (UVI) for La Union 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 La Union typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec10121414141314141312109
Data source: La Union 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 La Union Compares to Other Months

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

This table compares monthly weather conditions in La Union, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (69°F)86 mm (3.4 inches)80%very high
February Weather22°C (71°F)75 mm (3.0 inches)72%extreme
March Weather22°C (73°F)78 mm (3.1 inches)61%extreme
April Weather25°C (77°F)56 mm (2.2 inches)53%extreme
May Weather25°C (78°F)213 mm (8.4 inches)51%extreme
June Weather25°C (77°F)323 mm (12.7 inches)52%extreme
July Weather24°C (75°F)241 mm (9.5 inches)58%extreme
August Weather24°C (76°F)266 mm (10.5 inches)63%extreme
September Weather24°C (76°F)275 mm (10.8 inches)71%extreme
October Weather24°C (75°F)286 mm (11.3 inches)79%extreme
November Weather22°C (71°F)180 mm (7.1 inches)79%very high
December Weather21°C (70°F)98 mm (3.8 inches)74%very high

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