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September Weather in Day Valley, United States

Last updated: June 24, 2025

In September, the average temperature in Day Valley, United States hovers around 18°C (65°F), offering pleasant weather for exploration. However, be prepared for a range: temperatures can dip to a minimum of 8°C (47°F) and soar to a maximum of 37°C (98°F). With a mere 2 mm (0.1 in) of precipitation over 0 days, the chances of rain are low, allowing you to enjoy the outdoors. Finally, the average humidity stands at 55%, contributing to the comfortable atmosphere of this charming destination.

September Temperature in Day Valley

In September in Day Valley, the average temperature is 18°C (65°F), with maximums reaching up to 37°C (98°F) and minimums dropping as low as 8°C (47°F). This range makes it a great time to visit, as you can enjoy warm days while still having cooler evenings to relax.

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

The chart illustrates September temperature patterns in Day Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Day Valley, September typically has an average temperature of 18°C (65°F), with highs reaching up to 37°C (98°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec515254565862636465615551
Data source: Temperature data for Day 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 Day Valley

In Day Valley in September, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

September Precipitation Trends in Day Valley

The chart displays monthly precipitation patterns in Day 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 Day Valley, September typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec1221058832191112224292
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Day Valley

In Day Valley in September humidity is 55%. With an average temperature of 18°C (65°F), this humidity feels like a gentle embrace, creating a comfortable yet slightly sticky atmosphere that is perfect for leisurely strolls and outdoor adventures.

September Average Humidity in Day Valley

This chart illustrates the average monthly humidity levels in Day 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 Day Valley is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Day Valley

In Day 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 Day Valley.

Maximum UV Index Levels in Day Valley for September

The chart shows the monthly maximum UV Index (UVI) for Day 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 Day Valley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
Data source: Day 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 Day Valley Compares to Other Months

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

This table compares monthly weather conditions in Day Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)122 mm (4.8 inches)82%moderate
February Weather11°C (52°F)105 mm (4.1 inches)84%moderate
March Weather12°C (54°F)88 mm (3.5 inches)82%very high
April Weather13°C (57°F)32 mm (1.2 inches)78%very high
May Weather15°C (59°F)19 mm (0.7 inches)71%extreme
June Weather17°C (62°F)1 mm (0.1 inches)64%extreme
July Weather17°C (63°F)1 mm (0.0 inches)58%extreme
August Weather18°C (65°F)1 mm (0.0 inches)54%very high
September Weather18°C (65°F)2 mm (0.1 inches)55%very high
October Weather16°C (62°F)22 mm (0.9 inches)62%high
November Weather13°C (56°F)42 mm (1.7 inches)78%moderate
December Weather10°C (51°F)92 mm (3.6 inches)80%moderate

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