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September Weather in Rio Hondo, United States

Last updated: June 24, 2025

In September, the average temperature in Rio Hondo, United States reaches a warm 28°C (83°F). Expect lows of 18°C (66°F) and highs soaring up to 36°C (98°F). With 104 mm (4.1 in) of precipitation spread over 15 days, the air is often laden with average humidity at 73%, creating a tropical feel in this vibrant locale.

September Temperature in Rio Hondo

In September in Rio Hondo, the average temperature is 28°C (83°F), with maximums reaching 36°C (98°F) and minimums dropping to as low as 18°C (66°F). It's an ideal time for travelers to enjoy warm weather while having the flexibility to experience cooler evenings.

September Weather in Rio Hondo: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rio Hondo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Hondo, September typically has an average temperature of 28°C (83°F), with highs reaching up to 36°C (98°F) and lows dropping to around 18°C (66°F).
JanFebMarAprMayJunJulAugSepOctNovDec626471768184858683776965
Data source: Temperature data for Rio Hondo 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 Rio Hondo

In Rio Hondo in September, the precipitation amount is 104 mm (4.1 in) over a span of 15 days.

September Precipitation Trends in Rio Hondo

The chart displays monthly precipitation patterns in Rio Hondo, 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 Rio Hondo, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec31214029808710029104643228
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rio Hondo

In Rio Hondo in September, humidity is 73%. With an average temperature of 28°C (83°F), this humidity feels like a thick blanket enveloping your skin, making travel feel heavy and stifling, often requiring frequent breaks in shaded or air-conditioned areas to stay comfortable.

September Average Humidity in Rio Hondo

This chart illustrates the average monthly humidity levels in Rio Hondo, 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 Rio Hondo is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%79%76%77%80%73%66%65%73%76%80%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rio Hondo

In Rio Hondo in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Rio Hondo.

Maximum UV Index Levels in Rio Hondo for September

The chart shows the monthly maximum UV Index (UVI) for Rio Hondo 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 Rio Hondo typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101112121212111076
Data source: Rio Hondo 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 Rio Hondo Compares to Other Months

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

This table compares monthly weather conditions in Rio Hondo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)31 mm (1.2 inches)83%high
February Weather18°C (65°F)21 mm (0.8 inches)79%very high
March Weather22°C (71°F)40 mm (1.6 inches)76%very high
April Weather24°C (76°F)29 mm (1.2 inches)77%extreme
May Weather27°C (81°F)80 mm (3.1 inches)80%extreme
June Weather29°C (84°F)86 mm (3.4 inches)73%extreme
July Weather29°C (85°F)100 mm (3.9 inches)66%extreme
August Weather30°C (86°F)29 mm (1.2 inches)65%extreme
September Weather28°C (83°F)104 mm (4.1 inches)73%extreme
October Weather25°C (77°F)64 mm (2.5 inches)76%very high
November Weather21°C (70°F)32 mm (1.3 inches)80%high
December Weather18°C (65°F)28 mm (1.1 inches)86%high

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