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September Weather in Grottoes, United States

Last updated: June 24, 2025

In September, the average temperature in Grottoes, United States hovers around 21°C (69°F). Expect a minimum of 3°C (38°F) and a maximum that can soar to 35°C (95°F). During this month, you can also anticipate about 102 mm (4.0 in) of precipitation spread over 9 days, with an average humidity level of 68%. Get ready for a mix of mild temperatures and occasional showers!

September Temperature in Grottoes

In September in Grottoes, the average temperature is 21°C (69°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 3°C (38°F). Be prepared for a wide range of temperatures when traveling to Grottoes this month!

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

The chart illustrates September temperature patterns in Grottoes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grottoes, September typically has an average temperature of 21°C (69°F), with highs reaching up to 35°C (95°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec354045556472777469594439
Data source: Temperature data for Grottoes 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 Grottoes

In Grottoes in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

September Precipitation Trends in Grottoes

The chart displays monthly precipitation patterns in Grottoes, 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 Grottoes, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec60876710811089591081021067684
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grottoes

In Grottoes in September humidity is 68%. With average temperature 21°C (69°F), this humidity feels like a warm embrace, making it essential for travelers to stay hydrated and take breaks in the shade while exploring the local sights.

September Average Humidity in Grottoes

This chart illustrates the average monthly humidity levels in Grottoes, 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 Grottoes is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grottoes

In Grottoes 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 Grottoes.

Maximum UV Index Levels in Grottoes for September

The chart shows the monthly maximum UV Index (UVI) for Grottoes 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 Grottoes typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111010109753
Data source: Grottoes 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 Grottoes Compares to Other Months

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

This table compares monthly weather conditions in Grottoes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)60 mm (2.4 inches)86%moderate
February Weather5°C (40°F)87 mm (3.4 inches)86%moderate
March Weather7°C (46°F)67 mm (2.6 inches)86%high
April Weather13°C (55°F)108 mm (4.2 inches)84%very high
May Weather18°C (65°F)110 mm (4.3 inches)78%extreme
June Weather22°C (72°F)89 mm (3.5 inches)79%very high
July Weather25°C (77°F)59 mm (2.3 inches)70%very high
August Weather24°C (75°F)108 mm (4.2 inches)59%very high
September Weather21°C (69°F)102 mm (4.0 inches)68%very high
October Weather15°C (60°F)106 mm (4.2 inches)80%high
November Weather7°C (44°F)76 mm (3.0 inches)86%moderate
December Weather4°C (39°F)84 mm (3.3 inches)85%moderate

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