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September Weather in Tarkio, United States

Last updated: June 24, 2025

In September, the average temperature in Tarkio, United States sits comfortably at 21°C (71°F). Expect fluctuations between a chilly 6°C (43°F) and a warm 35°C (96°F). With an average precipitation of 97 mm (3.8 in) spread over 9 days, and humidity levels around 75%, be prepared for a mix of pleasant warmth and refreshing showers.

September Temperature in Tarkio

In September in Tarkio, the average temperature is 21°C (71°F), with maximums reaching 35°C (96°F) and minimums dropping as low as 6°C (43°F). This diverse temperature range makes it ideal for travelers looking to enjoy both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Tarkio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tarkio, September typically has an average temperature of 21°C (71°F), with highs reaching up to 35°C (96°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec272843526477797570544134
Data source: Temperature data for Tarkio 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 Tarkio

In Tarkio in September, the total precipitation amount reaches 97 mm (3.8 in) over the course of 9 days.

September Precipitation Trends in Tarkio

The chart displays monthly precipitation patterns in Tarkio, 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 Tarkio, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec36329377154118105116971423434
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Tarkio

In Tarkio in September, humidity is 75%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel slightly uncomfortable but offering a lush, vibrant atmosphere that invites exploration at a leisurely pace.

September Average Humidity in Tarkio

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

In Tarkio 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 Tarkio.

Maximum UV Index Levels in Tarkio for September

The chart shows the monthly maximum UV Index (UVI) for Tarkio 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 Tarkio typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
Data source: Tarkio 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 Tarkio Compares to Other Months

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

This table compares monthly weather conditions in Tarkio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)36 mm (1.4 inches)76%moderate
February Weather-2°C (28°F)32 mm (1.3 inches)80%moderate
March Weather6°C (44°F)93 mm (3.7 inches)73%high
April Weather11°C (52°F)77 mm (3.0 inches)74%very high
May Weather18°C (65°F)154 mm (6.1 inches)78%very high
June Weather25°C (77°F)118 mm (4.6 inches)82%extreme
July Weather26°C (79°F)105 mm (4.1 inches)83%very high
August Weather24°C (76°F)116 mm (4.6 inches)80%very high
September Weather21°C (71°F)97 mm (3.8 inches)75%very high
October Weather12°C (55°F)142 mm (5.6 inches)75%high
November Weather5°C (42°F)34 mm (1.4 inches)82%moderate
December Weather1°C (34°F)34 mm (1.3 inches)83%moderate

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