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September Weather in Spirit Lake, United States

Last updated: June 24, 2025

In Spirit Lake, United States, the average temperature in September is a comfortable 18°C (65°F). However, temperatures can swing from a brisk 3°C (38°F) to a warm 33°C (91°F). Expect about 114 mm (4.5 in) of precipitation spread over 9 days, with humidity levels averaging a notable 75%.

September Temperature in Spirit Lake

In September in Spirit Lake, the average temperature is 18°C (65°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 3°C (38°F). This climate makes Spirit Lake a great destination for travelers seeking a mix of warm days and cool evenings.

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 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec181834445972747165483526
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 114 mm (4.5 in) over the course of 9 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 114 mm (4.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec3235709513612990113114943242
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 75%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket that can make outdoor exploration feel a bit stifling, potentially leading to discomfort during travel activities.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%84%75%79%74%81%82%80%75%77%85%83%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098533
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-8°C (18°F)32 mm (1.3 inches)80%moderate
February Weather-8°C (18°F)35 mm (1.4 inches)84%moderate
March Weather1°C (34°F)70 mm (2.7 inches)75%high
April Weather7°C (45°F)95 mm (3.8 inches)79%very high
May Weather15°C (59°F)136 mm (5.4 inches)74%very high
June Weather22°C (72°F)129 mm (5.1 inches)81%extreme
July Weather23°C (74°F)90 mm (3.5 inches)82%very high
August Weather21°C (71°F)113 mm (4.4 inches)80%very high
September Weather18°C (65°F)114 mm (4.5 inches)75%very high
October Weather9°C (49°F)94 mm (3.7 inches)77%moderate
November Weather1°C (35°F)32 mm (1.3 inches)85%moderate
December Weather-3°C (26°F)42 mm (1.6 inches)83%moderate

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