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September Weather in Stanford, United States

Last updated: June 24, 2025

In September, the average temperature in Stanford, United States hovers around 14°C (58°F). Expect a minimum chill of -2°C (29°F) and a possible peak of 34°C (94°F). Rainfall averages 48 mm (1.9 in) over the course of 7 days, coupled with an average humidity of 68%.

September Temperature in Stanford

In September in Stanford, the average temperature is 14°C (58°F). Maximum temperatures can reach 34°C (94°F), while minimums can dip as low as -2°C (29°F). Travelers should be prepared for a wide range of weather conditions, from warm days to chilly nights.

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

The chart illustrates September temperature patterns in Stanford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Stanford, September typically has an average temperature of 14°C (58°F), with highs reaching up to 34°C (94°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec271933405161706858433629
Data source: Temperature data for Stanford 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 Stanford

In Stanford in September, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

September Precipitation Trends in Stanford

The chart displays monthly precipitation patterns in Stanford, 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 Stanford, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec224731797984273048493833
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Stanford

In Stanford in September, humidity is 68%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making it a bit challenging for traveling. The air feels heavy, and you may find yourself needing to take breaks more often as you explore the sights.

September Average Humidity in Stanford

This chart illustrates the average monthly humidity levels in Stanford, 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 Stanford is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Stanford

In Stanford 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 Stanford.

Maximum UV Index Levels in Stanford for September

The chart shows the monthly maximum UV Index (UVI) for Stanford 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 Stanford typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101098532
Data source: Stanford 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 Stanford Compares to Other Months

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

This table compares monthly weather conditions in Stanford, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)22 mm (0.9 inches)87%low
February Weather-7°C (19°F)47 mm (1.9 inches)88%moderate
March Weather1°C (33°F)31 mm (1.2 inches)83%moderate
April Weather4°C (40°F)79 mm (3.1 inches)78%very high
May Weather11°C (51°F)79 mm (3.1 inches)76%very high
June Weather16°C (62°F)84 mm (3.3 inches)78%very high
July Weather21°C (70°F)27 mm (1.1 inches)77%very high
August Weather20°C (68°F)30 mm (1.2 inches)71%very high
September Weather14°C (58°F)48 mm (1.9 inches)68%very high
October Weather6°C (43°F)49 mm (1.9 inches)72%moderate
November Weather2°C (36°F)38 mm (1.5 inches)84%moderate
December Weather-2°C (29°F)33 mm (1.3 inches)90%low

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