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September Weather in Monticello, Italy

Last updated: August 23, 2025

In Monticello, Italy, the average temperature in September hovers around 18°C (65°F). However, be prepared for fluctuations, as it can dip to a cool 7°C (45°F) at its lowest and soar to a warm 28°C (83°F) at its peak. Expect a total precipitation of 149 mm (5.8 in) spread over 12 days, with an average humidity level of 74%.

September Temperature in Monticello

In September in Monticello, the average temperature is 18°C (65°F). The maximum can reach 28°C (83°F), while the minimum can drop as low as 7°C (45°F). This mild climate makes Monticello an ideal destination for outdoor exploration and city sightseeing during this time of year.

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

The chart illustrates September temperature patterns in Monticello, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monticello, September typically has an average temperature of 18°C (65°F), with highs reaching up to 28°C (83°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec384247546271737365564739
Data source: Temperature data for 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 Monticello

In Monticello in September, the precipitation amount is 149 mm (5.8 in) over the course of 12 days.

September Precipitation Trends in Monticello

The chart displays monthly precipitation patterns in 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 Monticello, September typically receives around 149 mm (5.8 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec40498912515516315814814915616294
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Monticello

In Monticello in September humidity is 74%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can make even short walks feel laborious, leading travelers to seek shade and refreshment more often.

September Average Humidity in Monticello

This chart illustrates the average monthly humidity levels in 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 Monticello is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%81%76%77%74%71%67%64%74%87%88%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Monticello

In Monticello in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Monticello, you can refer to this Hourly UV Index in Monticello.

Maximum UV Index Levels in Monticello for September

The chart shows the monthly maximum UV Index (UVI) for 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 Monticello typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986532
Data source: 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 Monticello Compares to Other Months

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

This table compares monthly weather conditions in Monticello, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)40 mm (1.6 inches)88%low
February Weather6°C (42°F)49 mm (1.9 inches)81%moderate
March Weather8°C (47°F)89 mm (3.5 inches)76%moderate
April Weather12°C (55°F)125 mm (4.9 inches)77%high
May Weather16°C (62°F)155 mm (6.1 inches)74%very high
June Weather22°C (71°F)163 mm (6.4 inches)71%very high
July Weather23°C (74°F)158 mm (6.2 inches)67%very high
August Weather23°C (74°F)147 mm (5.8 inches)64%very high
September Weather18°C (65°F)149 mm (5.8 inches)74%high
October Weather14°C (57°F)156 mm (6.1 inches)87%moderate
November Weather9°C (48°F)162 mm (6.4 inches)88%moderate
December Weather4°C (40°F)94 mm (3.7 inches)85%low

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