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September Weather in Fremont, United States

Last updated: June 24, 2025

In September, the average temperature in Fremont, United States hovers around 20°C (68°F), offering a pleasant climate for outdoor activities. However, be prepared for fluctuations, as temperatures can dip to a chilly 5°C (41°F) or soar to a warm 34°C (93°F). With an average precipitation amount of 71 mm (2.8 in) over approximately 10 days, don't forget your umbrella! Additionally, enjoy the humid atmosphere with an average humidity level of 78%, perfect for that tropical feel.

September Temperature in Fremont

In September in Fremont, the average temperature is 20°C (68°F). Maximums can reach 34°C (93°F) and minimums can be as low as 5°C (41°F). Travelers should be prepared for warm days and cool nights, making layering essentials for this time of year.

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

The chart illustrates September temperature patterns in Fremont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fremont, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec293240506271757368574135
Data source: Temperature data for Fremont 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 Fremont

In Fremont in September, the precipitation amount is 71 mm (2.8 in) over a duration of 10 days.

September Precipitation Trends in Fremont

The chart displays monthly precipitation patterns in Fremont, 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 Fremont, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7081881051321251308771948867
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fremont

In Fremont in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Fremont

This chart illustrates the average monthly humidity levels in Fremont, 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 Fremont is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fremont

In Fremont 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 Fremont.

Maximum UV Index Levels in Fremont for September

The chart shows the monthly maximum UV Index (UVI) for Fremont 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 Fremont typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Fremont 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 Fremont Compares to Other Months

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

This table compares monthly weather conditions in Fremont, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)70 mm (2.8 inches)88%moderate
February Weather0°C (32°F)81 mm (3.2 inches)87%moderate
March Weather4°C (40°F)88 mm (3.5 inches)87%high
April Weather10°C (50°F)105 mm (4.1 inches)87%very high
May Weather17°C (62°F)132 mm (5.2 inches)81%very high
June Weather22°C (71°F)125 mm (4.9 inches)82%very high
July Weather24°C (75°F)130 mm (5.1 inches)81%very high
August Weather23°C (73°F)87 mm (3.4 inches)78%very high
September Weather20°C (68°F)71 mm (2.8 inches)78%very high
October Weather14°C (57°F)94 mm (3.7 inches)82%high
November Weather5°C (42°F)88 mm (3.5 inches)89%moderate
December Weather2°C (35°F)67 mm (2.6 inches)86%low

Compare Fremont's Climate with Cities Worldwide