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September Weather in Sterling, United States

Last updated: June 24, 2025

In September, the average temperature in Sterling, United States hovers around 22°C (71°F). Expect a minimum chill of 5°C (41°F) and a sweltering peak of 36°C (97°F). You'll likely experience 102 mm (4.0 in) of rainfall spread over 11 days, and the air will be fairly humid, averaging 68%. Get ready for a mix of warm days and occasional showers!

September Temperature in Sterling

In September in Sterling, the average temperature is 22°C (71°F). The maximum can reach 36°C (97°F), while the minimum can drop as low as 5°C (41°F). This wide range makes it essential for travelers to prepare for both warm and cool weather conditions.

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 22°C (71°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec364046566675807771614640
Data source: Temperature data for Sterling 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 Sterling

In Sterling in September, the precipitation amount is 102 mm (4.0 in) over the course of 11 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 102 mm (4.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec5997831001311101261371021058792
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sterling

In Sterling in September, humidity is 68%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making traveling quite pleasant yet slightly sticky as you explore the sights.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
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 Weather2°C (36°F)59 mm (2.3 inches)86%moderate
February Weather5°C (41°F)97 mm (3.8 inches)86%moderate
March Weather8°C (46°F)83 mm (3.3 inches)86%high
April Weather13°C (56°F)100 mm (3.9 inches)84%very high
May Weather19°C (66°F)131 mm (5.2 inches)78%very high
June Weather24°C (75°F)110 mm (4.3 inches)79%very high
July Weather27°C (80°F)126 mm (5.0 inches)70%very high
August Weather25°C (77°F)137 mm (5.4 inches)59%very high
September Weather22°C (71°F)102 mm (4.0 inches)68%very high
October Weather16°C (62°F)105 mm (4.1 inches)80%high
November Weather8°C (47°F)87 mm (3.4 inches)86%moderate
December Weather4°C (40°F)92 mm (3.6 inches)85%moderate

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