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September Weather in Caribou, United States

Last updated: June 24, 2025

In September, the average temperature in Caribou, United States hovers around 14°C (57°F), where it can feel quite varied—minimums dipping to -3°C (27°F) and soaring to a balmy 30°C (86°F). Expect some wet weather as well, with an average precipitation of 104 mm (4.1 in) spread across about 8 days. This time of year also sees a high average humidity of around 85%, contributing to a moist, inviting atmosphere.

September Temperature in Caribou

In September in Caribou, the average temperature is 14°C (57°F). Maximum temperatures can reach 30°C (86°F), while minimums can drop as low as -3°C (27°F). Be prepared for a wide range of temperatures when traveling to Caribou during this month.

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

The chart illustrates September temperature patterns in Caribou, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Caribou, September typically has an average temperature of 14°C (57°F), with highs reaching up to 30°C (86°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec141625385261676657463219
Data source: Temperature data for Caribou 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 Caribou

In Caribou, in September, the precipitation amount is 104 mm (4.1 in) over a span of 8 days.

September Precipitation Trends in Caribou

The chart displays monthly precipitation patterns in Caribou, 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 Caribou, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec92757411010290997810410711398
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Caribou

In Caribou 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 Caribou

This chart illustrates the average monthly humidity levels in Caribou, 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 Caribou 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 Caribou

In Caribou 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 Caribou.

Maximum UV Index Levels in Caribou for September

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

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

This table compares monthly weather conditions in Caribou, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (14°F)92 mm (3.6 inches)93%low
February Weather-9°C (16°F)75 mm (3.0 inches)92%moderate
March Weather-4°C (25°F)74 mm (2.9 inches)90%moderate
April Weather3°C (38°F)110 mm (4.3 inches)87%high
May Weather11°C (52°F)102 mm (4.0 inches)82%very high
June Weather16°C (62°F)90 mm (3.5 inches)77%very high
July Weather19°C (67°F)99 mm (3.9 inches)81%very high
August Weather19°C (66°F)78 mm (3.1 inches)83%very high
September Weather14°C (57°F)104 mm (4.1 inches)85%high
October Weather8°C (46°F)107 mm (4.2 inches)87%moderate
November Weather0°C (32°F)113 mm (4.4 inches)87%moderate
December Weather-7°C (19°F)98 mm (3.9 inches)90%low

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