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September Weather in Upland, United States

Last updated: June 24, 2025

In September, the average temperature in Upland, United States is a pleasant 20°C (69°F). Visitors can expect a range that dips to a minimum of 4°C (40°F) and peaks at around 33°C (92°F). This month brings about 71 mm (2.8 in) of precipitation over 8 days, contributing to an average humidity level of 78%.

September Temperature in Upland

In September in Upland, the average temperature is 20°C (69°F). Maximums can reach 33°C (92°F), while minimums can drop as low as 4°C (40°F). This varied climate makes Upland an ideal destination for travelers seeking both warmth and cooler experiences.

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

The chart illustrates September temperature patterns in Upland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upland, September typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241516373767368574135
Data source: Temperature data for Upland 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 Upland

In Upland in September, the precipitation amount is 71 mm (2.8 in) over the course of 8 days.

September Precipitation Trends in Upland

The chart displays monthly precipitation patterns in Upland, 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 Upland, September typically receives around 71 mm (2.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec768610494133106107100711018368
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Upland

In Upland in September, humidity is 78%. With an average temperature of 20°C (69°F), this humidity feels like a warm, enveloping blanket, making travel somewhat uncomfortable as sweat clings to your skin and the air feels thick and heavy, urging you to seek out shaded areas and refreshing drinks.

September Average Humidity in Upland

This chart illustrates the average monthly humidity levels in Upland, 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 Upland is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Upland

In Upland 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 Upland.

Maximum UV Index Levels in Upland for September

The chart shows the monthly maximum UV Index (UVI) for Upland 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 Upland typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Upland 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 Upland Compares to Other Months

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

This table compares monthly weather conditions in Upland, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)76 mm (3.0 inches)85%moderate
February Weather0°C (32°F)86 mm (3.4 inches)85%moderate
March Weather5°C (42°F)104 mm (4.1 inches)86%high
April Weather10°C (51°F)94 mm (3.7 inches)87%very high
May Weather17°C (63°F)133 mm (5.3 inches)81%very high
June Weather23°C (73°F)106 mm (4.2 inches)82%extreme
July Weather24°C (76°F)106 mm (4.2 inches)81%very high
August Weather23°C (73°F)100 mm (3.9 inches)79%very high
September Weather20°C (69°F)71 mm (2.8 inches)78%very high
October Weather14°C (57°F)101 mm (4.0 inches)81%high
November Weather5°C (41°F)83 mm (3.3 inches)89%moderate
December Weather2°C (35°F)68 mm (2.7 inches)86%low

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