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September Weather in Centralia, United States

Last updated: June 24, 2025

In Centralia, United States, the average temperature in September hovers around 23°C (73°F), creating a pleasant climate for exploration. Expect nighttime temperatures to dip to a chilly 8°C (46°F), while daytime highs can reach a sizzling 34°C (94°F). With an average humidity of 79%, the atmosphere feels warm and inviting. However, be prepared for 62 mm (2.5 in) of precipitation spread across 6 days, ensuring you stay refreshed throughout your adventures!

September Temperature in Centralia

In September in Centralia, the average temperature is 23°C (73°F). Maximums can reach 34°C (94°F) and minimums can be as low as 8°C (46°F). This makes it a great time to explore Centralia, but be sure to pack for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Centralia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Centralia, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec333747566877807773604540
Data source: Temperature data for Centralia 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 Centralia

In Centralia in September, the precipitation amount is 62 mm (2.5 in) over the course of 6 days.

September Precipitation Trends in Centralia

The chart displays monthly precipitation patterns in Centralia, 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 Centralia, September typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec859514112617610694100631218580
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Centralia

In Centralia in September humidity is 79%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that clings to the skin, making travel feel both invigorating and slightly exhausting as the air wraps around you like a damp blanket.

September Average Humidity in Centralia

This chart illustrates the average monthly humidity levels in Centralia, 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 Centralia is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Centralia

In Centralia 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 Centralia.

Maximum UV Index Levels in Centralia for September

The chart shows the monthly maximum UV Index (UVI) for Centralia 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 Centralia typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111110109753
Data source: Centralia 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 Centralia Compares to Other Months

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

This table compares monthly weather conditions in Centralia, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)85 mm (3.3 inches)84%moderate
February Weather3°C (37°F)95 mm (3.7 inches)82%moderate
March Weather9°C (48°F)141 mm (5.6 inches)84%high
April Weather13°C (56°F)126 mm (5.0 inches)83%very high
May Weather20°C (68°F)176 mm (6.9 inches)80%extreme
June Weather25°C (77°F)106 mm (4.2 inches)83%extreme
July Weather27°C (80°F)94 mm (3.7 inches)82%very high
August Weather25°C (77°F)100 mm (3.9 inches)82%very high
September Weather23°C (73°F)62 mm (2.5 inches)79%very high
October Weather15°C (60°F)121 mm (4.8 inches)79%high
November Weather7°C (45°F)84 mm (3.3 inches)88%moderate
December Weather4°C (40°F)80 mm (3.2 inches)87%moderate

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