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September Weather in Rio Grande, United States

Last updated: June 24, 2025

In Rio Grande, United States, the average temperature in September hovers around 22°C (72°F), creating a pleasant atmosphere. Expect the minimum to dip to 13°C (56°F) and the maximum to rise to 29°C (85°F). During this month, you're likely to encounter about 107 mm (4.2 in) of precipitation spread over 10 days, with average humidity levels sitting at a comfortable 75%.

September Temperature in Rio Grande

In September in Rio Grande, the average temperature is 22°C (72°F). Maximum temperatures can reach 29°C (85°F), while minimums can dip as low as 13°C (56°F). This mild and comfortable climate makes Rio Grande an ideal destination for travelers looking to explore and enjoy outdoor activities.

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 22°C (72°F), with highs reaching up to 29°C (85°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec384044536171787772645143
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 107 mm (4.2 in) accumulated over a period of 10 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 107 mm (4.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec74113111941257712911510714290118
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 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101010108743
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 Weather3°C (38°F)74 mm (2.9 inches)84%moderate
February Weather5°C (40°F)113 mm (4.4 inches)83%moderate
March Weather7°C (44°F)111 mm (4.4 inches)83%high
April Weather11°C (53°F)94 mm (3.7 inches)81%very high
May Weather16°C (61°F)125 mm (4.9 inches)78%very high
June Weather22°C (71°F)77 mm (3.0 inches)79%very high
July Weather25°C (78°F)129 mm (5.1 inches)74%very high
August Weather25°C (77°F)115 mm (4.5 inches)72%very high
September Weather22°C (72°F)107 mm (4.2 inches)75%very high
October Weather18°C (64°F)142 mm (5.6 inches)81%high
November Weather10°C (51°F)90 mm (3.5 inches)85%moderate
December Weather6°C (44°F)118 mm (4.6 inches)84%moderate

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