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September Weather in Bellaire, United States

Last updated: June 24, 2025

In September, the average temperature in Bellaire, United States hovers around 20°C (69°F). You'll experience a variety of temperatures, with a minimum of 5°C (41°F) and a maximum reaching 34°C (93°F). Be prepared for 113 mm (4.4 in) of precipitation spread across 10 days, and expect the air to be fairly humid with an average humidity of 73%.

September Temperature in Bellaire

In September in Bellaire, the average temperature is 20°C (69°F). Maximums can reach 34°C (93°F), and minimums can be as low as 5°C (41°F). This makes it a great time to visit, as you can enjoy warm days while still experiencing cooler evenings.

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

The chart illustrates September temperature patterns in Bellaire, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bellaire, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec323643526370757368584337
Data source: Temperature data for Bellaire 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 Bellaire

In Bellaire in September, the total precipitation amount is 113 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Bellaire

The chart displays monthly precipitation patterns in Bellaire, 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 Bellaire, September typically receives around 113 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec921171161391381571238911311889112
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bellaire

In Bellaire in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Bellaire

This chart illustrates the average monthly humidity levels in Bellaire, 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 Bellaire is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%88%87%82%84%82%73%74%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bellaire

In Bellaire 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 Bellaire.

Maximum UV Index Levels in Bellaire for September

The chart shows the monthly maximum UV Index (UVI) for Bellaire 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 Bellaire typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
Data source: Bellaire 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 Bellaire Compares to Other Months

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

This table compares monthly weather conditions in Bellaire, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)92 mm (3.6 inches)88%moderate
February Weather2°C (36°F)117 mm (4.6 inches)88%moderate
March Weather6°C (43°F)116 mm (4.6 inches)88%high
April Weather11°C (52°F)139 mm (5.5 inches)86%very high
May Weather17°C (63°F)138 mm (5.4 inches)82%very high
June Weather21°C (71°F)156 mm (6.2 inches)84%very high
July Weather24°C (75°F)123 mm (4.9 inches)82%very high
August Weather23°C (73°F)89 mm (3.5 inches)73%very high
September Weather20°C (69°F)113 mm (4.4 inches)73%very high
October Weather14°C (58°F)118 mm (4.7 inches)81%high
November Weather6°C (43°F)89 mm (3.5 inches)89%moderate
December Weather3°C (37°F)112 mm (4.4 inches)86%moderate

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