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September Weather in Belmont, United States

Last updated: June 24, 2025

In Belmont, United States, the average temperature in September is a comfortable 18°C (65°F). However, be prepared for a range that can dip as low as 1°C (34°F) and rise to a sweltering 35°C (96°F). During this month, expect about 115 mm (4.5 in) of precipitation spread over 10 days, contributing to an average humidity of 79%. Stay hydrated and enjoy the climate!

September Temperature in Belmont

In September in Belmont, the average temperature is 18°C (65°F), with maximums reaching 35°C (96°F) and minimums dropping to as low as 1°C (34°F). This diverse range of temperatures makes it essential for travelers to pack accordingly, ensuring comfort for both warm days and cooler nights.

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 18°C (65°F), with highs reaching up to 35°C (96°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec262736465970757265533832
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 115 mm (4.5 in) over a span of 10 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 115 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6469688713912470781151326367
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 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
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 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
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 (26°F)64 mm (2.5 inches)87%low
February Weather-3°C (27°F)69 mm (2.7 inches)87%moderate
March Weather2°C (37°F)67 mm (2.7 inches)86%moderate
April Weather8°C (47°F)87 mm (3.4 inches)87%very high
May Weather15°C (60°F)139 mm (5.5 inches)82%very high
June Weather21°C (70°F)124 mm (4.9 inches)81%very high
July Weather24°C (75°F)70 mm (2.7 inches)78%very high
August Weather22°C (72°F)78 mm (3.1 inches)79%very high
September Weather18°C (65°F)115 mm (4.5 inches)79%high
October Weather11°C (53°F)132 mm (5.2 inches)82%moderate
November Weather3°C (38°F)63 mm (2.5 inches)87%moderate
December Weather0°C (32°F)67 mm (2.7 inches)86%low

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