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September Weather in Rio Grande, United States

Last updated: June 24, 2025

In September, the average temperature in Rio Grande, United States is a comfortable 21°C (71°F). Expect minimums dipping to 6°C (43°F) and maximums soaring up to 36°C (98°F). With an average humidity of 73%, you might feel that warmth a bit more. Be prepared for some rain, as 101 mm (4.0 in) of precipitation can fall over just 8 days throughout the month.

September Temperature in Rio Grande

In September in Rio Grande, the average temperature is 21°C (71°F). Maximums can reach 36°C (98°F) and minimums can be as low as 6°C (43°F). This mild climate makes Rio Grande an ideal destination for travelers seeking a pleasant getaway.

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

The chart illustrates September temperature patterns in Rio Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Grande, September typically has an average temperature of 21°C (71°F), with highs reaching up to 36°C (98°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec343946556573787570594539
Data source: Temperature data for Rio Grande 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 Grande

In Rio Grande in September, the precipitation amount is 101 mm (4.0 in) spread over 8 days.

September Precipitation Trends in Rio Grande

The chart displays monthly precipitation patterns in Rio Grande, 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 Grande, September typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec8712711113312914311011910110881117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rio Grande

In Rio Grande in September humidity is 73%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities a bit uncomfortable, but with proper hydration and breaks in the shade, it’s still manageable for traveling.

September Average Humidity in Rio Grande

This chart illustrates the average monthly humidity levels in Rio Grande, 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 Grande is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rio Grande

In Rio Grande in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Rio Grande.

Maximum UV Index Levels in Rio Grande for September

The chart shows the monthly maximum UV Index (UVI) for Rio Grande 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 Grande typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Rio Grande 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 Grande Compares to Other Months

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

This table compares monthly weather conditions in Rio Grande, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)87 mm (3.4 inches)88%moderate
February Weather4°C (39°F)127 mm (5.0 inches)88%moderate
March Weather8°C (46°F)111 mm (4.4 inches)87%high
April Weather13°C (55°F)133 mm (5.2 inches)85%very high
May Weather19°C (66°F)128 mm (5.1 inches)81%very high
June Weather23°C (73°F)143 mm (5.6 inches)82%very high
July Weather25°C (78°F)109 mm (4.3 inches)81%very high
August Weather24°C (75°F)119 mm (4.7 inches)73%very high
September Weather21°C (71°F)101 mm (4.0 inches)73%very high
October Weather15°C (60°F)108 mm (4.3 inches)78%high
November Weather7°C (45°F)81 mm (3.2 inches)89%moderate
December Weather4°C (39°F)117 mm (4.6 inches)87%moderate

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