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September Weather in Grayson Valley, United States

Last updated: June 24, 2025

In Grayson Valley, United States, the average temperature in September hovers around 25°C (77°F), offering a warm and inviting climate. However, temperatures can dip as low as 10°C (51°F) and soar up to a sweltering 37°C (98°F). Be prepared for a little rain, as 89 mm (3.5 in) of precipitation typically falls over 8 days, accompanied by an average humidity of 73%.

September Temperature in Grayson Valley

In September in Grayson Valley, the average temperature is 25°C (77°F). Maximum temperatures can reach 37°C (98°F), and the minimum can drop as low as 10°C (51°F). This makes for a pleasant time to explore and enjoy various outdoor activities.

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

The chart illustrates September temperature patterns in Grayson Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grayson 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 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec465157637277818076675249
Data source: Temperature data for Grayson 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 Grayson Valley

In Grayson Valley in September, the precipitation amount is 89 mm (3.5 in) over a span of 8 days.

September Precipitation Trends in Grayson Valley

The chart displays monthly precipitation patterns in Grayson 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 Grayson Valley, September typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec118180164154991341011168913181147
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grayson Valley

In Grayson 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 Grayson Valley

This chart illustrates the average monthly humidity levels in Grayson 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 Grayson 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 Grayson Valley

In Grayson 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 Grayson Valley.

Maximum UV Index Levels in Grayson Valley for September

The chart shows the monthly maximum UV Index (UVI) for Grayson 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 Grayson Valley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119764
Data source: Grayson 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 Grayson Valley Compares to Other Months

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

This table compares monthly weather conditions in Grayson Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (46°F)118 mm (4.6 inches)85%moderate
February Weather11°C (52°F)180 mm (7.1 inches)84%high
March Weather14°C (58°F)164 mm (6.5 inches)82%very high
April Weather17°C (63°F)154 mm (6.0 inches)82%very high
May Weather22°C (72°F)99 mm (3.9 inches)81%extreme
June Weather25°C (78°F)134 mm (5.3 inches)77%extreme
July Weather27°C (81°F)101 mm (4.0 inches)77%extreme
August Weather27°C (80°F)116 mm (4.6 inches)72%extreme
September Weather25°C (77°F)89 mm (3.5 inches)73%very high
October Weather19°C (67°F)131 mm (5.1 inches)73%high
November Weather11°C (53°F)81 mm (3.2 inches)85%high
December Weather9°C (49°F)147 mm (5.8 inches)88%moderate

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