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September Weather in Lacey, United States

Last updated: June 24, 2025

In Lacey, United States, the average temperature in September hovers around 16°C (62°F). Expect nighttime lows to dip to 6°C (43°F), while days can warm up to a pleasant 30°C (87°F). However, be prepared for some rain, as 85 mm (3.4 in) of precipitation typically falls over 10 days. With an average humidity of 74%, the air can feel quite muggy at times.

September Temperature in Lacey

In September in Lacey, the average temperature is 16°C (62°F). Maximums can reach 30°C (87°F) and minimums can be as low as 6°C (43°F). It's a perfect time to visit if you enjoy mild temperatures with a chance to experience warmer days!

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

The chart illustrates September temperature patterns in Lacey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lacey, September typically has an average temperature of 16°C (62°F), with highs reaching up to 30°C (87°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec424145505661656661524641
Data source: Temperature data for Lacey 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 Lacey

In Lacey in September, the precipitation amount is 85 mm (3.4 in) over the course of 10 days.

September Precipitation Trends in Lacey

The chart displays monthly precipitation patterns in Lacey, 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 Lacey, September typically receives around 85 mm (3.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec1851631311166252101385134182199
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lacey

In Lacey in September, humidity is 74%. With an average temperature of 16°C (62°F), this humidity feels like a warm, heavy blanket enveloping you, making it slightly uncomfortable for traveling as it can lead to a sticky sensation that may sap your energy during outdoor activities.

September Average Humidity in Lacey

This chart illustrates the average monthly humidity levels in Lacey, 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 Lacey is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lacey

In Lacey 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 Lacey.

Maximum UV Index Levels in Lacey for September

The chart shows the monthly maximum UV Index (UVI) for Lacey 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 Lacey typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987531
Data source: Lacey 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 Lacey Compares to Other Months

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

This table compares monthly weather conditions in Lacey, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)185 mm (7.3 inches)86%low
February Weather5°C (41°F)163 mm (6.4 inches)84%moderate
March Weather7°C (45°F)131 mm (5.2 inches)85%moderate
April Weather10°C (50°F)116 mm (4.6 inches)83%high
May Weather13°C (56°F)62 mm (2.5 inches)84%very high
June Weather16°C (61°F)52 mm (2.1 inches)84%very high
July Weather19°C (66°F)10 mm (0.4 inches)82%very high
August Weather19°C (66°F)13 mm (0.5 inches)73%very high
September Weather16°C (62°F)85 mm (3.4 inches)74%high
October Weather11°C (52°F)134 mm (5.3 inches)83%moderate
November Weather8°C (46°F)182 mm (7.2 inches)86%moderate
December Weather5°C (42°F)199 mm (7.8 inches)87%low

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