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September Weather in Valley, United States

Last updated: June 24, 2025

In Valley, United States, the month of September welcomes an average temperature of 25°C (77°F). Expect a range with minimums dipping to 12°C (54°F) and soaring to a maximum of 37°C (98°F). During this time, precipitation averages around 106 mm (4.2 in) spread over 9 days, contributing to an average humidity level of 73%.

September Temperature in Valley

In September in Valley, the average temperature is 25°C (77°F). Maximums can reach 37°C (98°F) and minimums can be as low as 12°C (54°F). It's an ideal time for travelers seeking warm weather while also enjoying some cooler evenings.

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

The chart illustrates September temperature patterns in Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valley, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec485459647278807977685551
Data source: Temperature data for Valley 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 Valley

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

September Precipitation Trends in Valley

The chart displays monthly precipitation patterns in Valley, 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 Valley, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec11713010411612312711313410611082144
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Valley

In Valley in September humidity is 73%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel a bit sticky but also vibrant and lively, as the air carries the rich scents of the surrounding environment.

September Average Humidity in Valley

This chart illustrates the average monthly humidity levels in Valley, 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 Valley is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Valley

In Valley 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 Valley.

Maximum UV Index Levels in Valley for September

The chart shows the monthly maximum UV Index (UVI) for Valley 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 Valley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Valley 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 Valley Compares to Other Months

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

This table compares monthly weather conditions in Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)117 mm (4.6 inches)85%moderate
February Weather12°C (54°F)130 mm (5.1 inches)84%high
March Weather15°C (59°F)104 mm (4.1 inches)82%very high
April Weather18°C (64°F)116 mm (4.6 inches)82%very high
May Weather22°C (73°F)123 mm (4.8 inches)81%extreme
June Weather25°C (78°F)127 mm (5.0 inches)77%extreme
July Weather27°C (80°F)113 mm (4.4 inches)77%extreme
August Weather26°C (80°F)134 mm (5.3 inches)72%extreme
September Weather25°C (77°F)106 mm (4.2 inches)73%very high
October Weather20°C (69°F)110 mm (4.3 inches)73%very high
November Weather13°C (55°F)82 mm (3.2 inches)85%high
December Weather10°C (51°F)144 mm (5.7 inches)88%moderate

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