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September Weather in Stanford, United States

Last updated: June 24, 2025

The average temperature in Stanford, United States during September is a pleasant 22°C (71°F), with minimums dipping to 8°C (47°F) and maximums soaring to 35°C (96°F). Expect around 128 mm (5.0 in) of precipitation over 9 days, accompanied by an average humidity of 67%. Stay prepared for a mix of warmth and refreshing rain!

September Temperature in Stanford

In September in Stanford, the average temperature is 22°C (71°F). Maximum temperatures can reach 35°C (96°F), while minimums can dip as low as 8°C (47°F). This mild climate makes Stanford an ideal destination for travelers seeking comfortable weather and outdoor adventures.

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 22°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec374249566773777671614642
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 precipitation amount is 128 mm (5.0 in) over a span of 9 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 128 mm (5.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec10016914314413816411211812812087144
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 67%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet slightly uncomfortable, as the air hangs thick, reminding travelers to stay hydrated and seek shade during the midday sun.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
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 Weather3°C (37°F)100 mm (3.9 inches)88%moderate
February Weather5°C (42°F)169 mm (6.6 inches)88%high
March Weather9°C (49°F)143 mm (5.6 inches)87%high
April Weather13°C (56°F)144 mm (5.7 inches)84%very high
May Weather20°C (67°F)138 mm (5.4 inches)84%very high
June Weather23°C (74°F)164 mm (6.4 inches)83%extreme
July Weather25°C (78°F)112 mm (4.4 inches)79%extreme
August Weather24°C (76°F)118 mm (4.6 inches)66%very high
September Weather22°C (71°F)128 mm (5.0 inches)67%very high
October Weather16°C (61°F)120 mm (4.7 inches)76%high
November Weather8°C (46°F)87 mm (3.4 inches)89%moderate
December Weather5°C (42°F)144 mm (5.7 inches)88%moderate

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