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September Weather in Keizer, United States

Last updated: June 24, 2025

In September, the average temperature in Keizer, United States is a pleasant 18°C (65°F). However, expect fluctuations with minimums dipping to 5°C (41°F) and maximums soaring up to 36°C (97°F). The region typically experiences 53 mm (2.1 in) of precipitation over about 6 days, while humidity hovers at 71%, creating a uniquely vibrant climate.

September Temperature in Keizer

In September in Keizer, the average temperature is 18°C (65°F). Maximums can reach 36°C (97°F), and minimums can drop as low as 5°C (41°F). It's advisable to pack for both warm and cooler conditions while exploring this destination.

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

The chart illustrates September temperature patterns in Keizer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keizer, September typically has an average temperature of 18°C (65°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec434247525865717165544742
Data source: Temperature data for Keizer 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 Keizer

In Keizer in September, the precipitation amount is 53 mm (2.1 in) over a span of 6 days.

September Precipitation Trends in Keizer

The chart displays monthly precipitation patterns in Keizer, 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 Keizer, September typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1411601161014734345382124173
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Keizer

In Keizer in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.

September Average Humidity in Keizer

This chart illustrates the average monthly humidity levels in Keizer, 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 Keizer is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Keizer

In Keizer 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 Keizer.

Maximum UV Index Levels in Keizer for September

The chart shows the monthly maximum UV Index (UVI) for Keizer 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 Keizer typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec23579101097532
Data source: Keizer 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 Keizer Compares to Other Months

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

This table compares monthly weather conditions in Keizer, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)141 mm (5.5 inches)85%low
February Weather6°C (43°F)159 mm (6.3 inches)84%moderate
March Weather8°C (47°F)116 mm (4.6 inches)85%moderate
April Weather11°C (52°F)101 mm (4.0 inches)83%high
May Weather15°C (59°F)47 mm (1.9 inches)83%very high
June Weather18°C (65°F)33 mm (1.3 inches)83%very high
July Weather22°C (71°F)3 mm (0.1 inches)82%very high
August Weather22°C (72°F)4 mm (0.2 inches)74%very high
September Weather18°C (65°F)53 mm (2.1 inches)71%high
October Weather12°C (54°F)82 mm (3.2 inches)81%moderate
November Weather9°C (48°F)124 mm (4.9 inches)87%moderate
December Weather6°C (42°F)173 mm (6.8 inches)87%low

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