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September Weather in Fort Fairfield, United States

Last updated: June 24, 2025

In September, the average temperature in Fort Fairfield, United States hovers around 14°C (57°F), with fluctuations ranging from a chilly -3°C (27°F) to a warm 29°C (84°F). Expect about 111 mm (4.4 in) of precipitation spread over 11 days, paired with a high average humidity of 85%. Prepare for a month of mixed weather that requires both warmth and waterproof gear!

September Temperature in Fort Fairfield

In September in Fort Fairfield, the average temperature is 14°C (57°F). Maximums can reach 29°C (84°F), while minimums can drop as low as -3°C (27°F). It's advisable to pack a mix of clothing to prepare for both warm days and chilly nights during your travels.

September Weather in Fort Fairfield: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Fort Fairfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort Fairfield, September typically has an average temperature of 14°C (57°F), with highs reaching up to 29°C (84°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec141625385161666556453119
Data source: Temperature data for Fort Fairfield 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 Fort Fairfield

In Fort Fairfield in September, the precipitation amount is 111 mm (4.4 in), occurring over the course of 11 days.

September Precipitation Trends in Fort Fairfield

The chart displays monthly precipitation patterns in Fort Fairfield, 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 Fort Fairfield, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9377761111079210089111113118104
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fort Fairfield

In Fort Fairfield in September, humidity is 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

September Average Humidity in Fort Fairfield

This chart illustrates the average monthly humidity levels in Fort Fairfield, 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 Fort Fairfield is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%87%82%77%82%83%85%87%88%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fort Fairfield

In Fort Fairfield 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 Fort Fairfield.

Maximum UV Index Levels in Fort Fairfield for September

The chart shows the monthly maximum UV Index (UVI) for Fort Fairfield 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 Fort Fairfield typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887532
Data source: Fort Fairfield 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 Fort Fairfield Compares to Other Months

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

This table compares monthly weather conditions in Fort Fairfield, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (15°F)93 mm (3.7 inches)93%low
February Weather-9°C (16°F)77 mm (3.0 inches)92%moderate
March Weather-4°C (25°F)76 mm (3.0 inches)90%moderate
April Weather3°C (38°F)111 mm (4.4 inches)87%high
May Weather10°C (51°F)107 mm (4.2 inches)82%very high
June Weather16°C (61°F)92 mm (3.6 inches)77%very high
July Weather19°C (66°F)100 mm (3.9 inches)81%very high
August Weather18°C (65°F)88 mm (3.5 inches)83%very high
September Weather14°C (57°F)111 mm (4.4 inches)85%high
October Weather7°C (45°F)113 mm (4.5 inches)87%moderate
November Weather0°C (32°F)118 mm (4.6 inches)87%moderate
December Weather-7°C (20°F)104 mm (4.1 inches)90%low

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