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September Weather in Sidney, United States

Last updated: June 24, 2025

In Sidney, United States, the average temperature in September hovers around 19°C (67°F), making it a pleasantly warm time of year. However, be prepared for a temperature swing where it can dip down to a chilly 1°C (34°F) or soar up to a blistering 38°C (101°F). Expect a moderate precipitation of 26 mm (1.0 in) spread over 4 days, and with an average humidity level of 75%, the atmosphere has a nice balance of comfort and moisture.

September Temperature in Sidney

In September in Sidney, the average temperature is 19°C (67°F), with maximums reaching 38°C (101°F) and minimums dropping as low as 1°C (34°F). This diverse range in temperatures makes it essential for travelers to pack both lightweight clothing for the heat and warmer layers for the cooler evenings.

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 19°C (67°F), with highs reaching up to 38°C (101°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec323041475771767367494235
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 26 mm (1.0 in) over the course of 4 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 26 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec1218635811651483126312114
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 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

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.
JanFebMarAprMayJunJulAugSepOctNovDec72%76%62%60%74%82%82%84%75%73%74%77%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
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 Weather0°C (32°F)12 mm (0.5 inches)72%moderate
February Weather-1°C (30°F)18 mm (0.7 inches)76%moderate
March Weather5°C (42°F)63 mm (2.5 inches)61%high
April Weather9°C (48°F)58 mm (2.3 inches)60%very high
May Weather14°C (57°F)116 mm (4.6 inches)74%very high
June Weather22°C (71°F)51 mm (2.0 inches)82%extreme
July Weather24°C (76°F)48 mm (1.9 inches)82%extreme
August Weather23°C (73°F)31 mm (1.2 inches)84%very high
September Weather19°C (67°F)26 mm (1.0 inches)75%very high
October Weather9°C (49°F)31 mm (1.2 inches)73%high
November Weather6°C (42°F)21 mm (0.8 inches)74%moderate
December Weather1°C (35°F)14 mm (0.6 inches)77%moderate

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