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September Weather in Belmont, United States

Last updated: June 24, 2025

In September, the average temperature in Belmont, United States hovers around 16°C (62°F). However, temperatures can range significantly, dipping to a chilly 0°C (32°F) and peaking at a warm 31°C (88°F). Travelers should prepare for some wet days, as 77 mm (3.0 in) of precipitation is expected over 9 days, with an average humidity level of 76%.

September Temperature in Belmont

In September in Belmont, the average temperature is 16°C (62°F). Maximums can reach 31°C (88°F), while minimums can drop as low as 0°C (32°F). Be prepared for a variety of weather conditions when traveling during this time.

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

The chart illustrates September temperature patterns in Belmont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belmont, September typically has an average temperature of 16°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec242734445665706862513730
Data source: Temperature data for Belmont 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 Belmont

In Belmont in September, the precipitation amount is 77 mm (3.0 in) over the course of 9 days.

September Precipitation Trends in Belmont

The chart displays monthly precipitation patterns in Belmont, 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 Belmont, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7890801091179911884771278587
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Belmont

In Belmont in September, humidity is 76%. With an average temperature of 16°C (62°F), this humidity feels like a warm, enveloping blanket that makes exploring the outdoors feel both refreshing and slightly muggy, urging travelers to take breaks often and enjoy the shade.

September Average Humidity in Belmont

This chart illustrates the average monthly humidity levels in Belmont, 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 Belmont is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Belmont

In Belmont 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 Belmont.

Maximum UV Index Levels in Belmont for September

The chart shows the monthly maximum UV Index (UVI) for Belmont 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 Belmont typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Belmont 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 Belmont Compares to Other Months

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

This table compares monthly weather conditions in Belmont, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)78 mm (3.1 inches)91%moderate
February Weather-3°C (27°F)90 mm (3.5 inches)91%moderate
March Weather1°C (34°F)80 mm (3.1 inches)88%high
April Weather7°C (45°F)109 mm (4.3 inches)88%very high
May Weather14°C (57°F)117 mm (4.6 inches)82%very high
June Weather18°C (65°F)99 mm (3.9 inches)79%very high
July Weather21°C (70°F)118 mm (4.7 inches)77%very high
August Weather20°C (68°F)84 mm (3.3 inches)72%very high
September Weather16°C (62°F)77 mm (3.0 inches)76%very high
October Weather11°C (52°F)127 mm (5.0 inches)83%high
November Weather3°C (37°F)85 mm (3.4 inches)88%moderate
December Weather-1°C (30°F)87 mm (3.4 inches)87%low

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