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September Weather in Sidney, United States

Last updated: June 24, 2025

In September, the average temperature in Sidney, United States is a pleasant 21°C (71°F). Visitors can expect a minimum of 6°C (43°F) and a maximum of 36°C (97°F) during this time. However, be prepared for some rain, as 95 mm (3.7 in) of precipitation is likely over 9 days. With an average humidity of 75%, it's advisable to stay hydrated and enjoy the unique climate!

September Temperature in Sidney

In September in Sidney, the average temperature is 21°C (71°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 6°C (43°F). Be prepared for a range of temperatures to ensure a comfortable and enjoyable travel experience.

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 21°C (71°F), with highs reaching up to 36°C (97°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec262743526477797570544133
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 precipitation amount is 95 mm (3.7 in) over the course of 9 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 95 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3432946214711191102951512934
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 75%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel slightly uncomfortable but offering a lush, vibrant atmosphere that invites exploration at a leisurely pace.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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-3°C (26°F)34 mm (1.3 inches)76%moderate
February Weather-3°C (27°F)32 mm (1.3 inches)80%moderate
March Weather6°C (43°F)94 mm (3.7 inches)73%high
April Weather11°C (52°F)62 mm (2.4 inches)74%very high
May Weather18°C (64°F)147 mm (5.8 inches)78%very high
June Weather25°C (77°F)111 mm (4.4 inches)82%very high
July Weather26°C (79°F)91 mm (3.6 inches)83%very high
August Weather24°C (76°F)102 mm (4.0 inches)80%very high
September Weather21°C (71°F)95 mm (3.7 inches)75%very high
October Weather12°C (54°F)151 mm (5.9 inches)75%high
November Weather5°C (41°F)29 mm (1.2 inches)82%moderate
December Weather0°C (33°F)34 mm (1.3 inches)83%moderate

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