September Weather in Rio Vista, United States

Last updated: June 24, 2025

In Rio Vista, United States, the average temperature in September hovers around 22°C (72°F), creating a pleasant climate for outdoor activities. However, temperatures can vary significantly, with minimums dropping to 9°C (49°F) and maximums soaring to 42°C (108°F). Despite these fluctuations, precipitation is minimal at just 1 mm (0.0 in) over the entire month, contributing to an average humidity level of 44%. Enjoy the delightful weather!

September Temperature in Rio Vista

In September in Rio Vista, the average temperature is 22°C (72°F). Maximums can reach 42°C (108°F), while minimums can dip as low as 9°C (49°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack accordingly for both warm days and cooler nights.

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 22°C (72°F), with highs reaching up to 42°C (108°F) and lows dropping to around 9°C (49°F).

Data source: Temperature data for Rio Vista generated using information from the Copernicus Climate Change Service.

September Precipitation in Rio Vista

In Rio Vista in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 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 1 mm (0.0 inches) of precipitation spread over approximately 0 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Rio Vista

In Rio Vista in September, humidity is 44%. With an average temperature of 22°C (72°F), this humidity feels like a comfortable embrace, making it perfect for outdoor adventures and sightseeing without feeling too sticky or oppressive.

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 44%, offering insight into how humid the weather typically is during this month.

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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	116 mm (4.6 inches)	84%	moderate
February Weather	12°C (53°F)	99 mm (3.9 inches)	84%	moderate
March Weather	13°C (56°F)	76 mm (3.0 inches)	83%	high
April Weather	17°C (62°F)	33 mm (1.3 inches)	81%	very high
May Weather	19°C (67°F)	16 mm (0.6 inches)	74%	very high
June Weather	23°C (73°F)	2 mm (0.1 inches)	64%	extreme
July Weather	23°C (74°F)	0 mm (0.0 inches)	44%	extreme
August Weather	23°C (73°F)	0 mm (0.0 inches)	36%	very high
September Weather	22°C (72°F)	1 mm (0.0 inches)	44%	very high
October Weather	19°C (66°F)	31 mm (1.2 inches)	65%	high
November Weather	13°C (56°F)	40 mm (1.6 inches)	84%	moderate
December Weather	10°C (50°F)	90 mm (3.5 inches)	83%	moderate