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September Weather in Marysville, United States

Last updated: June 24, 2025

In Marysville, United States, the average temperature in September is a pleasant 22°C (72°F). However, temperatures can fluctuate, with a minimum of 5°C (42°F) and a maximum soaring to 37°C (100°F). Expect about 63 mm (2.5 in) of precipitation over approximately 7 days, contributing to an average humidity of 71%. This month offers a diverse climate experience, making it an intriguing time to visit!

September Temperature in Marysville

In September, in Marysville, the average temperature is 22°C (72°F). Maximum can reach 37°C (100°F), and minimum can be as low as 5°C (42°F). This range makes it an ideal destination for travelers looking to enjoy both warm and mild weather.

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

The chart illustrates September temperature patterns in Marysville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Marysville, September typically has an average temperature of 22°C (72°F), with highs reaching up to 37°C (100°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec303045536577807672554335
Data source: Temperature data for Marysville 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 Marysville

In Marysville in September, the precipitation amount is 63 mm (2.5 in) over a span of 7 days.

September Precipitation Trends in Marysville

The chart displays monthly precipitation patterns in Marysville, 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 Marysville, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec282887692011029198631233326
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Marysville

In Marysville in September humidity is 71%. With an average temperature of 22°C (72°F), this humidity feels like the air is thick and slightly stifling, making outdoor activities require frequent breaks to stay hydrated and cool.

September Average Humidity in Marysville

This chart illustrates the average monthly humidity levels in Marysville, 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 Marysville is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Marysville

In Marysville 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 Marysville.

Maximum UV Index Levels in Marysville for September

The chart shows the monthly maximum UV Index (UVI) for Marysville 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 Marysville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Marysville 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 Marysville Compares to Other Months

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

This table compares monthly weather conditions in Marysville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)28 mm (1.1 inches)76%moderate
February Weather-1°C (30°F)28 mm (1.1 inches)77%moderate
March Weather7°C (45°F)87 mm (3.4 inches)70%high
April Weather12°C (53°F)69 mm (2.7 inches)73%very high
May Weather18°C (65°F)201 mm (7.9 inches)82%very high
June Weather25°C (78°F)102 mm (4.0 inches)82%extreme
July Weather27°C (81°F)91 mm (3.6 inches)81%extreme
August Weather25°C (77°F)98 mm (3.9 inches)78%very high
September Weather22°C (72°F)63 mm (2.5 inches)71%very high
October Weather13°C (55°F)123 mm (4.9 inches)71%high
November Weather6°C (43°F)33 mm (1.3 inches)81%moderate
December Weather2°C (36°F)26 mm (1.0 inches)84%moderate

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