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September Weather in Sterling, United States

Last updated: June 24, 2025

In September, the average temperature in Sterling, United States sits at a pleasant 24°C (76°F). Expect a range where temperatures can dip to a cool 8°C (47°F) or soar up to a sizzling 38°C (101°F). During this time, precipitation averages around 95 mm (3.7 in) over 6 days, while the air maintains a moderate humidity level of 64%.

September Temperature in Sterling

In September in Sterling, the average temperature is 24°C (76°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 8°C (47°F). Be prepared for warm days and cool evenings, making it ideal for both outdoor activities and cozy nights.

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 24°C (76°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec414255617180848276635145
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 95 mm (3.7 in) spread over a period of 6 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 95 mm (3.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec40428412014962365595932237
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 64%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace, making travel slightly uncomfortable but still enjoyable, as you may find yourself yearning for a refreshing breeze or a quick dip in the water.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%70%72%82%82%80%72%64%71%81%84%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110754
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 Weather5°C (41°F)40 mm (1.6 inches)76%moderate
February Weather6°C (42°F)42 mm (1.6 inches)76%high
March Weather13°C (55°F)84 mm (3.3 inches)70%very high
April Weather16°C (61°F)120 mm (4.7 inches)72%very high
May Weather21°C (71°F)149 mm (5.9 inches)82%extreme
June Weather26°C (80°F)62 mm (2.4 inches)82%extreme
July Weather29°C (84°F)36 mm (1.4 inches)80%extreme
August Weather28°C (83°F)55 mm (2.2 inches)72%extreme
September Weather24°C (76°F)95 mm (3.7 inches)64%very high
October Weather17°C (63°F)93 mm (3.7 inches)71%high
November Weather11°C (51°F)22 mm (0.9 inches)81%moderate
December Weather7°C (45°F)37 mm (1.5 inches)84%moderate

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