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September Weather in Sidney, United States

Last updated: June 24, 2025

In September, the average temperature in Sidney, United States hovers around 20°C (69°F), with minimums dropping to 5°C (40°F) and maximums soaring to 34°C (93°F). Expect about 78 mm (3.1 in) of precipitation spread over 8 days, accompanied by an average humidity level of 78%. Prepare for what the weather brings!

September Temperature in Sidney

In September in Sidney, the average temperature is 20°C (69°F), with maximums reaching 34°C (93°F) and minimums dipping as low as 5°C (40°F). Be prepared for a range of weather conditions if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Sidney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sidney, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec303342516372767369574136
Data source: Temperature data for Sidney 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 Sidney

In Sidney in September, the total precipitation amount is 78 mm (3.1 in) over the course of 8 days.

September Precipitation Trends in Sidney

The chart displays monthly precipitation patterns in Sidney, 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 Sidney, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7297103101126121105100781018978
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sidney

In Sidney in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Sidney

This chart illustrates the average monthly humidity levels in Sidney, 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 Sidney is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sidney

In Sidney 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 Sidney.

Maximum UV Index Levels in Sidney for September

The chart shows the monthly maximum UV Index (UVI) for Sidney 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 Sidney typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Sidney 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 Sidney Compares to Other Months

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

This table compares monthly weather conditions in Sidney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)72 mm (2.8 inches)88%moderate
February Weather0°C (33°F)97 mm (3.8 inches)87%moderate
March Weather5°C (42°F)103 mm (4.0 inches)87%high
April Weather11°C (51°F)101 mm (4.0 inches)87%very high
May Weather17°C (63°F)125 mm (4.9 inches)81%very high
June Weather22°C (72°F)121 mm (4.8 inches)82%very high
July Weather24°C (76°F)105 mm (4.1 inches)81%very high
August Weather23°C (73°F)100 mm (3.9 inches)78%very high
September Weather20°C (69°F)78 mm (3.1 inches)78%very high
October Weather14°C (57°F)101 mm (4.0 inches)82%high
November Weather5°C (42°F)89 mm (3.5 inches)89%moderate
December Weather2°C (36°F)78 mm (3.1 inches)86%low

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