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September Weather in Lake Monticello, United States

Last updated: June 24, 2025

In Lake Monticello, United States, the average temperature for September is a pleasant 22°C (72°F). However, temperatures can fluctuate significantly, with minimums dipping to 5°C (42°F) and maximums soaring to 38°C (100°F). Expect some rain, as precipitation averages around 92 mm (3.6 in) spread over 10 days, and the average humidity hovers at a comfortable 75%.

September Temperature in Lake Monticello

In September in Lake Monticello, the average temperature is 22°C (72°F). Maximum temperatures can reach up to 38°C (100°F), while minimum temperatures can drop as low as 5°C (42°F). Overall, this weather offers a comfortable range for travelers looking to explore the area.

September Weather in Lake Monticello: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lake Monticello, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lake Monticello, September typically has an average temperature of 22°C (72°F), with highs reaching up to 38°C (100°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec384348586775817872634842
Data source: Temperature data for Lake Monticello 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 Lake Monticello

In Lake Monticello in September, the total precipitation amount is 92 mm (3.6 in), which falls over the course of 10 days.

September Precipitation Trends in Lake Monticello

The chart displays monthly precipitation patterns in Lake Monticello, 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 Lake Monticello, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6495681111089961123921107589
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lake Monticello

In Lake Monticello in September, humidity is 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

September Average Humidity in Lake Monticello

This chart illustrates the average monthly humidity levels in Lake Monticello, 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 Lake Monticello is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%84%82%83%83%79%77%75%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lake Monticello

In Lake Monticello 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 Lake Monticello.

Maximum UV Index Levels in Lake Monticello for September

The chart shows the monthly maximum UV Index (UVI) for Lake Monticello 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 Lake Monticello typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101010108753
Data source: Lake Monticello 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 Lake Monticello Compares to Other Months

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

This table compares monthly weather conditions in Lake Monticello, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)64 mm (2.5 inches)84%moderate
February Weather6°C (43°F)95 mm (3.8 inches)84%high
March Weather9°C (49°F)67 mm (2.7 inches)84%high
April Weather15°C (59°F)111 mm (4.4 inches)82%very high
May Weather20°C (68°F)108 mm (4.3 inches)82%very high
June Weather24°C (75°F)99 mm (3.9 inches)83%very high
July Weather27°C (81°F)61 mm (2.4 inches)79%very high
August Weather25°C (78°F)123 mm (4.8 inches)77%very high
September Weather22°C (72°F)92 mm (3.6 inches)75%very high
October Weather17°C (63°F)110 mm (4.3 inches)81%high
November Weather9°C (48°F)75 mm (3.0 inches)87%moderate
December Weather5°C (42°F)89 mm (3.5 inches)85%moderate

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