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September Weather in Riverdale, United States

Last updated: June 24, 2025

In Riverdale, United States, the average temperature in September hovers around 27°C (81°F). During this time, temperatures can range from a cool 11°C (53°F) to a scorching 43°C (109°F). Rainfall is minimal, with only 1 mm (0.0 in) expected over 0 days, and the average humidity sits at a comfortable 42%.

September Temperature in Riverdale

In September in Riverdale, the average temperature is 27°C (81°F). The maximum can reach 43°C (109°F), while the minimum can be as low as 11°C (53°F). Travelers should be prepared for a wide range of temperatures and plan accordingly.

September Weather in Riverdale: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Riverdale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverdale, September typically has an average temperature of 27°C (81°F), with highs reaching up to 43°C (109°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec515458667383898780685850
Data source: Temperature data for Riverdale 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 Riverdale

In Riverdale in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in Riverdale

The chart displays monthly precipitation patterns in Riverdale, 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 Riverdale, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec64547530201001112951
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Riverdale

In Riverdale in September, humidity is 42%. With an average temperature of 27°C (81°F), this humidity feels like a pleasant embrace, making outdoor activities enjoyable while keeping you comfortably refreshed throughout your travels.

September Average Humidity in Riverdale

This chart illustrates the average monthly humidity levels in Riverdale, 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 Riverdale is approximately 42%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%85%80%72%58%49%36%30%42%59%78%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Riverdale

In Riverdale 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 Riverdale.

Maximum UV Index Levels in Riverdale for September

The chart shows the monthly maximum UV Index (UVI) for Riverdale 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 Riverdale typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589101111109743
Data source: Riverdale 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 Riverdale Compares to Other Months

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

This table compares monthly weather conditions in Riverdale, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)64 mm (2.5 inches)82%moderate
February Weather12°C (54°F)54 mm (2.1 inches)85%moderate
March Weather15°C (58°F)75 mm (2.9 inches)80%very high
April Weather19°C (66°F)30 mm (1.2 inches)72%very high
May Weather23°C (74°F)20 mm (0.8 inches)58%very high
June Weather28°C (83°F)1 mm (0.0 inches)49%extreme
July Weather32°C (89°F)0 mm (0.0 inches)36%extreme
August Weather31°C (87°F)0 mm (0.0 inches)30%very high
September Weather27°C (81°F)1 mm (0.0 inches)42%very high
October Weather20°C (69°F)11 mm (0.4 inches)59%high
November Weather14°C (58°F)29 mm (1.1 inches)78%moderate
December Weather10°C (50°F)51 mm (2.0 inches)79%moderate

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