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September Weather in San Marino, United States

Last updated: June 24, 2025

In September, the average temperature in San Marino, United States is a pleasant 23°C (74°F). Expect a comfortable range with minimums dipping to 12°C (54°F) and soaring to a hot 44°C (112°F). With an average humidity of 68% and a modest precipitation amount of 4 mm (0.1 in) across just 0 days, it's the perfect time to explore the area's vibrant attractions!

September Temperature in San Marino

In September in San Marino, the average temperature is 23°C (74°F). Maximum can reach 44°C (112°F) and minimum can be as low as 12°C (54°F). Be prepared for a wide temperature range and pack accordingly for your travels.

September Weather in San Marino: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Marino, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Marino, September typically has an average temperature of 23°C (74°F), with highs reaching up to 44°C (112°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec555658636570757674696255
Data source: Temperature data for San Marino 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 San Marino

In San Marino in September, the precipitation amount is 4 mm (0.1 in) recorded over a span of 0 days.

September Precipitation Trends in San Marino

The chart displays monthly precipitation patterns in San Marino, 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 San Marino, September typically receives around 4 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec75636723163224102072
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Marino

In San Marino in September, humidity is 68%. With an average temperature of 23°C (74°F), this humidity feels like a warm embrace, making traveling quite uncomfortable if you're not prepared. The air is thick and muggy, leaving you yearning for a cool breeze and frequent breaks in the shade.

September Average Humidity in San Marino

This chart illustrates the average monthly humidity levels in San Marino, 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 San Marino is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Marino

In San Marino in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in San Marino.

Maximum UV Index Levels in San Marino for September

The chart shows the monthly maximum UV Index (UVI) for San Marino 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 San Marino typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101011111010754
Data source: San Marino 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 San Marino Compares to Other Months

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

This table compares monthly weather conditions in San Marino, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather13°C (56°F)75 mm (3.0 inches)74%moderate
February Weather13°C (56°F)63 mm (2.5 inches)79%high
March Weather14°C (58°F)67 mm (2.7 inches)75%very high
April Weather17°C (63°F)23 mm (0.9 inches)70%very high
May Weather18°C (65°F)16 mm (0.6 inches)70%very high
June Weather21°C (70°F)3 mm (0.1 inches)72%extreme
July Weather24°C (76°F)2 mm (0.1 inches)73%extreme
August Weather25°C (76°F)2 mm (0.1 inches)69%very high
September Weather23°C (74°F)4 mm (0.1 inches)68%very high
October Weather20°C (69°F)10 mm (0.4 inches)67%high
November Weather17°C (62°F)20 mm (0.8 inches)68%moderate
December Weather13°C (56°F)72 mm (2.8 inches)71%moderate

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