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September Weather in Bonney Lake, United States

Last updated: June 24, 2025

In September, the average temperature in Bonney Lake, United States is a comfortable 16°C (61°F). Daily highs can reach up to 29°C (84°F), while the nights may cool down to a minimum of 7°C (45°F). Expect 97 mm (3.8 in) of precipitation spread over 11 days, contributing to an average humidity of 62%.

September Temperature in Bonney Lake

In September in Bonney Lake, the average temperature is 16°C (61°F). The maximum can reach 29°C (84°F), and the minimum can be as low as 7°C (45°F). This pleasant climate makes Bonney Lake an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

September Weather in Bonney Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bonney Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bonney Lake, September typically has an average temperature of 16°C (61°F), with highs reaching up to 29°C (84°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec413944485560656660514541
Data source: Temperature data for Bonney Lake 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 Bonney Lake

In Bonney Lake in September, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.

September Precipitation Trends in Bonney Lake

The chart displays monthly precipitation patterns in Bonney Lake, 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 Bonney Lake, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec1871931381206964131697153193208
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bonney Lake

In Bonney Lake in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Bonney Lake

This chart illustrates the average monthly humidity levels in Bonney Lake, 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 Bonney Lake is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bonney Lake

In Bonney Lake 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 Bonney Lake.

Maximum UV Index Levels in Bonney Lake for September

The chart shows the monthly maximum UV Index (UVI) for Bonney Lake 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 Bonney Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Bonney Lake 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 Bonney Lake Compares to Other Months

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

This table compares monthly weather conditions in Bonney Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)187 mm (7.4 inches)86%low
February Weather4°C (40°F)193 mm (7.6 inches)86%moderate
March Weather6°C (44°F)138 mm (5.4 inches)87%moderate
April Weather9°C (48°F)120 mm (4.7 inches)84%high
May Weather13°C (55°F)69 mm (2.7 inches)81%very high
June Weather16°C (60°F)64 mm (2.5 inches)82%very high
July Weather18°C (65°F)13 mm (0.5 inches)79%very high
August Weather19°C (66°F)16 mm (0.6 inches)63%very high
September Weather16°C (61°F)97 mm (3.8 inches)62%high
October Weather10°C (51°F)153 mm (6.0 inches)83%moderate
November Weather7°C (46°F)193 mm (7.6 inches)89%moderate
December Weather5°C (41°F)208 mm (8.2 inches)88%low

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