nomadseason

September Weather in Sterling, United States

Last updated: June 24, 2025

In September, the average temperature in Sterling, United States is a comfortable 17°C (63°F). However, be prepared for a temperature range that can swing from a chilly 1°C (34°F) to a warm 35°C (95°F). During this month, expect around 78 mm (3.1 in) of precipitation spread over 9 days, contributing to an overall average humidity of 80%.

September Temperature in Sterling

In September in Sterling, the average temperature is 17°C (63°F). Maximums can reach 35°C (95°F), while minimums can drop to as low as 1°C (34°F). This range makes it an ideal time for travelers to experience a variety of weather conditions, perfect for outdoor activities and exploring the local scenery.

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

The chart illustrates September temperature patterns in Sterling, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sterling, September typically has an average temperature of 17°C (63°F), with highs reaching up to 35°C (95°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec232433445768737063513730
Data source: Temperature data for Sterling generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Sterling

In Sterling in September, the precipitation amount is 78 mm (3.1 in) over the course of 9 days.

September Precipitation Trends in Sterling

The chart displays monthly precipitation patterns in Sterling, 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 Sterling, September typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec50505383105908596781185758
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Sterling

In Sterling in September humidity is 80%. With an average temperature of 17°C (63°F), this humidity feels like you're walking through a thick, warm blanket, making travel feel slightly stifling and requiring frequent breaks to stay comfortable.

September Average Humidity in Sterling

This chart illustrates the average monthly humidity levels in Sterling, 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 Sterling is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sterling

In Sterling in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Sterling.

Maximum UV Index Levels in Sterling for September

The chart shows the monthly maximum UV Index (UVI) for Sterling 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 Sterling typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Sterling 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 Sterling Compares to Other Months

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

This table compares monthly weather conditions in Sterling, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)50 mm (2.0 inches)88%low
February Weather-5°C (24°F)50 mm (2.0 inches)87%moderate
March Weather1°C (34°F)53 mm (2.1 inches)85%moderate
April Weather7°C (45°F)83 mm (3.3 inches)86%very high
May Weather14°C (58°F)105 mm (4.1 inches)80%very high
June Weather20°C (68°F)90 mm (3.6 inches)80%very high
July Weather23°C (74°F)85 mm (3.4 inches)80%very high
August Weather21°C (71°F)96 mm (3.8 inches)80%very high
September Weather17°C (63°F)78 mm (3.1 inches)80%high
October Weather11°C (52°F)118 mm (4.7 inches)84%moderate
November Weather3°C (37°F)57 mm (2.2 inches)89%moderate
December Weather-1°C (30°F)58 mm (2.3 inches)86%low

Compare Sterling's Climate with Cities Worldwide