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September Weather in Spirit Lake, United States

Last updated: June 24, 2025

In September, the average temperature in Spirit Lake, United States hovers around 16°C (61°F). Expect a minimum of 1°C (35°F) and a maximum reaching 34°C (93°F). During this month, the region experiences approximately 50 mm (2.0 in) of precipitation over 6 days, with an average humidity level of 62%. Prepare for a varied climate and enjoy the unique charm of Spirit Lake!

September Temperature in Spirit Lake

In September in Spirit Lake, the average temperature is 16°C (61°F). The maximum can reach 34°C (93°F), while the minimum can drop to as low as 1°C (35°F). It's advisable to pack for a range of temperatures to ensure comfort during your travels.

September Weather in Spirit Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Spirit Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Spirit Lake, September typically has an average temperature of 16°C (61°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec302837455563727261473832
Data source: Temperature data for Spirit Lake 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 Spirit Lake

In Spirit Lake in September, the precipitation amount is 50 mm (2.0 in) over the course of 6 days.

September Precipitation Trends in Spirit Lake

The chart displays monthly precipitation patterns in Spirit Lake, 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 Spirit Lake, September typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec10498858161347195085113114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Spirit Lake

In Spirit Lake in September, humidity is 62%. With an average temperature of 16°C (61°F), this humidity feels like a gentle blanket, making traveling comfortable yet occasionally sticky, prompting the need for light, breathable clothing to fully enjoy the sights.

September Average Humidity in Spirit Lake

This chart illustrates the average monthly humidity levels in Spirit Lake, 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 Spirit Lake is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Spirit Lake

In Spirit Lake 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 Spirit Lake.

Maximum UV Index Levels in Spirit Lake for September

The chart shows the monthly maximum UV Index (UVI) for Spirit Lake 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 Spirit Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245689997432
Data source: Spirit Lake 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 Spirit Lake Compares to Other Months

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

This table compares monthly weather conditions in Spirit Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)104 mm (4.1 inches)89%low
February Weather-2°C (29°F)98 mm (3.9 inches)89%moderate
March Weather3°C (37°F)85 mm (3.3 inches)87%moderate
April Weather7°C (45°F)81 mm (3.2 inches)84%high
May Weather13°C (55°F)61 mm (2.4 inches)77%very high
June Weather17°C (63°F)34 mm (1.3 inches)78%very high
July Weather22°C (72°F)7 mm (0.3 inches)77%very high
August Weather22°C (72°F)19 mm (0.8 inches)64%very high
September Weather16°C (61°F)50 mm (2.0 inches)62%high
October Weather8°C (47°F)85 mm (3.4 inches)79%moderate
November Weather3°C (38°F)113 mm (4.4 inches)87%moderate
December Weather0°C (32°F)114 mm (4.5 inches)90%low

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