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September Weather in Blair, United States

Last updated: June 24, 2025

In September, the average temperature in Blair, United States is a pleasant 21°C (69°F). However, temperatures can vary significantly, with a minimum of 4°C (40°F) and a maximum reaching up to 36°C (97°F). Expect around 81 mm (3.2 in) of precipitation over 9 days, contributing to an average humidity level of 75%.

September Temperature in Blair

In September in Blair, the average temperature is 21°C (69°F). Maximum temperatures can reach 36°C (97°F), while the minimum can drop as low as 4°C (40°F). This diverse range of temperatures makes Blair an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Blair, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blair, September typically has an average temperature of 21°C (69°F), with highs reaching up to 36°C (97°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec252541506275787469523930
Data source: Temperature data for Blair 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 Blair

In Blair in September, the precipitation amount is 81 mm (3.2 in) spread over a duration of 9 days.

September Precipitation Trends in Blair

The chart displays monthly precipitation patterns in Blair, 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 Blair, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3132906015412667106811113139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blair

In Blair in September, humidity is 75%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace that can make even a short walk feel exhausting for travelers, often leading to a longing for refreshing breezes or air-conditioned retreats.

September Average Humidity in Blair

This chart illustrates the average monthly humidity levels in Blair, 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 Blair is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blair

In Blair 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 Blair.

Maximum UV Index Levels in Blair for September

The chart shows the monthly maximum UV Index (UVI) for Blair 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 Blair typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Blair 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 Blair Compares to Other Months

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

This table compares monthly weather conditions in Blair, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)31 mm (1.2 inches)76%moderate
February Weather-4°C (25°F)32 mm (1.3 inches)80%moderate
March Weather5°C (41°F)90 mm (3.5 inches)73%high
April Weather10°C (50°F)60 mm (2.4 inches)74%very high
May Weather17°C (63°F)154 mm (6.1 inches)78%very high
June Weather24°C (76°F)126 mm (5.0 inches)82%very high
July Weather25°C (78°F)66 mm (2.6 inches)83%very high
August Weather23°C (74°F)106 mm (4.2 inches)80%very high
September Weather21°C (69°F)81 mm (3.2 inches)75%very high
October Weather11°C (53°F)111 mm (4.4 inches)75%high
November Weather4°C (40°F)31 mm (1.2 inches)82%moderate
December Weather-1°C (31°F)39 mm (1.5 inches)83%low

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