nomadseason

September Weather in Roseville, United States

Last updated: June 24, 2025

In Roseville, United States, the average temperature in September hovers around 20°C (69°F), with minimums dipping to 5°C (42°F) and maximums soaring to 36°C (97°F). Expect some rain, as precipitation typically reaches 106 mm (4.2 in) over 9 days. With an average humidity of 73%, it's wise to prepare for a warm and occasionally damp atmosphere.

September Temperature in Roseville

In September in Roseville, the average temperature is 20°C (69°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 5°C (42°F). This wide range makes it a great time to pack for varying weather conditions while exploring the area.

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

The chart illustrates September temperature patterns in Roseville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roseville, September typically has an average temperature of 20°C (69°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec323643536471767369584337
Data source: Temperature data for Roseville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Roseville

In Roseville in September, the total precipitation amount is 106 mm (4.2 in), spread over the course of 9 days.

September Precipitation Trends in Roseville

The chart displays monthly precipitation patterns in Roseville, 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 Roseville, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec8811911713814117413311310610794110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Roseville

In Roseville in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Roseville

This chart illustrates the average monthly humidity levels in Roseville, 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 Roseville is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roseville

In Roseville in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Roseville.

Maximum UV Index Levels in Roseville for September

The chart shows the monthly maximum UV Index (UVI) for Roseville 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 Roseville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Roseville 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 Roseville Compares to Other Months

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

This table compares monthly weather conditions in Roseville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)88 mm (3.5 inches)88%moderate
February Weather2°C (36°F)119 mm (4.7 inches)88%moderate
March Weather6°C (44°F)117 mm (4.6 inches)88%high
April Weather12°C (53°F)138 mm (5.4 inches)86%very high
May Weather18°C (64°F)141 mm (5.5 inches)82%very high
June Weather22°C (72°F)174 mm (6.9 inches)84%very high
July Weather24°C (76°F)133 mm (5.2 inches)82%very high
August Weather23°C (74°F)113 mm (4.5 inches)73%very high
September Weather20°C (69°F)106 mm (4.2 inches)73%very high
October Weather15°C (58°F)107 mm (4.2 inches)81%high
November Weather6°C (43°F)94 mm (3.7 inches)89%moderate
December Weather3°C (38°F)110 mm (4.3 inches)86%moderate

Compare Roseville's Climate with Cities Worldwide