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September Weather in Rio Vista, United States

Last updated: June 24, 2025

In Rio Vista, United States, the average temperature in September hovers around 26°C (80°F). Expect a range, with minimums dipping to 10°C (50°F) and highs soaring to 38°C (101°F). During this month, precipitation averages 71 mm (2.8 in) over about 8 days, and the air tends to be fairly humid, with an average humidity of 65%.

September Temperature in Rio Vista

In September in Rio Vista, the average temperature is 26°C (80°F). Maximum temperatures can reach 38°C (101°F), while minimums can drop as low as 10°C (50°F). Travelers should prepare for warm days and cooler evenings, making layered clothing a smart choice.

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

The chart illustrates September temperature patterns in Rio Vista, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rio Vista, September typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec485061667581858579685752
Data source: Temperature data for Rio Vista 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 Vista

In Rio Vista in September, the precipitation amount is 71 mm (2.8 in) over the course of 8 days.

September Precipitation Trends in Rio Vista

The chart displays monthly precipitation patterns in Rio Vista, 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 Vista, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec56908599174816298711344556
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rio Vista

In Rio Vista in September humidity is 65%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel less comfortable as you navigate the sights.

September Average Humidity in Rio Vista

This chart illustrates the average monthly humidity levels in Rio Vista, 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 Vista is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%79%78%78%81%78%73%66%65%72%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rio Vista

In Rio Vista in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Rio Vista.

Maximum UV Index Levels in Rio Vista for September

The chart shows the monthly maximum UV Index (UVI) for Rio Vista 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 Vista typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478101111111110864
Data source: Rio Vista 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 Vista Compares to Other Months

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

This table compares monthly weather conditions in Rio Vista, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)56 mm (2.2 inches)80%moderate
February Weather10°C (50°F)90 mm (3.5 inches)79%high
March Weather16°C (61°F)85 mm (3.4 inches)78%very high
April Weather19°C (66°F)99 mm (3.9 inches)78%very high
May Weather24°C (75°F)174 mm (6.9 inches)81%extreme
June Weather27°C (82°F)81 mm (3.2 inches)78%extreme
July Weather29°C (85°F)62 mm (2.5 inches)73%extreme
August Weather29°C (85°F)98 mm (3.9 inches)66%extreme
September Weather26°C (80°F)71 mm (2.8 inches)65%very high
October Weather20°C (69°F)134 mm (5.3 inches)72%very high
November Weather14°C (57°F)45 mm (1.8 inches)82%high
December Weather11°C (52°F)56 mm (2.2 inches)87%moderate

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