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September Weather in Blaine, United States

Last updated: June 24, 2025

In September, the average temperature in Blaine, United States hovers around 16°C (61°F). Expect a minimum of 7°C (45°F) and a maximum soaring to 33°C (91°F). With 149 mm (5.9 in) of precipitation spread over 12 days, staying dry might be a challenge. Humidity levels can be fairly high at 76%, making the air feel a bit more tropical.

September Temperature in Blaine

In September in Blaine, the average temperature is 16°C (61°F), with maximums reaching 33°C (91°F) and minimums dropping to as low as 7°C (45°F). This variation in temperature makes it advisable to pack layers for your travels.

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

The chart illustrates September temperature patterns in Blaine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blaine, September typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (91°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec403944505661656660514540
Data source: Temperature data for Blaine 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 Blaine

In Blaine in September, the precipitation amount is 149 mm (5.9 in) spread over 12 days.

September Precipitation Trends in Blaine

The chart displays monthly precipitation patterns in Blaine, 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 Blaine, September typically receives around 149 mm (5.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec22016515913573602823149198296238
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blaine

In Blaine in September humidity is 76%. With an average temperature of 16°C (61°F), this humidity feels like a warm embrace that makes traveling feel slightly heavy yet refreshing, often prompting you to seek shade or indulge in ice-cold drinks to stay comfortable.

September Average Humidity in Blaine

This chart illustrates the average monthly humidity levels in Blaine, 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 Blaine is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%86%86%81%83%84%77%76%88%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blaine

In Blaine in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Blaine, you can refer to this Hourly UV Index in Blaine.

Maximum UV Index Levels in Blaine for September

The chart shows the monthly maximum UV Index (UVI) for Blaine 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 Blaine typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234678986421
Data source: Blaine 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 Blaine Compares to Other Months

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

This table compares monthly weather conditions in Blaine, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)220 mm (8.6 inches)86%low
February Weather4°C (39°F)165 mm (6.5 inches)85%moderate
March Weather7°C (45°F)159 mm (6.3 inches)86%moderate
April Weather10°C (50°F)135 mm (5.3 inches)86%high
May Weather13°C (56°F)73 mm (2.9 inches)81%high
June Weather16°C (61°F)60 mm (2.3 inches)83%very high
July Weather18°C (66°F)28 mm (1.1 inches)84%very high
August Weather19°C (66°F)23 mm (0.9 inches)77%very high
September Weather16°C (61°F)149 mm (5.9 inches)76%high
October Weather10°C (51°F)198 mm (7.8 inches)88%moderate
November Weather7°C (45°F)296 mm (11.7 inches)87%low
December Weather4°C (40°F)238 mm (9.4 inches)87%low

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