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September Weather in Blair, United States

Last updated: June 24, 2025

In Blair, United States, the average temperature in September hovers around 18°C (64°F), with fluctuations from a chilly 2°C (35°F) to a balmy 33°C (92°F). Expect about 110 mm (4.3 in) of precipitation over 10 days, contributing to a notably high average humidity of 80%. Prepare accordingly for a mix of weather!

September Temperature in Blair

In September in Blair, the average temperature is 18°C (64°F). Maximums can reach 33°C (92°F) and minimums can be as low as 2°C (35°F). Travelers should be prepared for a wide range of temperatures.

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 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec181935445970737064493425
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 110 mm (4.3 in) over a period of 10 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 110 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec334957931401541021441101195447
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 80%. With an average temperature of 18°C (64°F), this humidity feels like a warm, damp blanket wrapping around you, making travel a bit more exhausting as the air thickens and the heat clings to your skin.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%86%85%79%80%80%78%80%84%89%85%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458810997532
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-8°C (19°F)33 mm (1.3 inches)88%low
February Weather-7°C (20°F)49 mm (1.9 inches)89%moderate
March Weather1°C (35°F)57 mm (2.2 inches)86%moderate
April Weather7°C (45°F)93 mm (3.6 inches)85%very high
May Weather15°C (59°F)140 mm (5.5 inches)79%very high
June Weather21°C (70°F)154 mm (6.1 inches)80%very high
July Weather23°C (74°F)102 mm (4.0 inches)80%very high
August Weather21°C (70°F)144 mm (5.7 inches)78%very high
September Weather18°C (64°F)110 mm (4.3 inches)80%high
October Weather9°C (49°F)119 mm (4.7 inches)84%moderate
November Weather1°C (34°F)54 mm (2.1 inches)89%moderate
December Weather-4°C (26°F)47 mm (1.9 inches)85%low

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