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September Weather in Twisp, United States

Last updated: June 24, 2025

In September, the average temperature in Twisp, United States is a mild 14°C (58°F), making it a pleasant time to visit. While you may experience a minimum chill of 1°C (34°F), temperatures can also soar to a warm 34°C (93°F). With a precipitation amount of 30 mm (1.2 in) spread over 5 days, don't forget your umbrella! Additionally, the average humidity hovers around a comfortable 76%, ensuring the air feels just right.

September Temperature in Twisp

In September, in Twisp, the average temperature is 14°C (58°F). The maximum can reach 34°C (93°F), while the minimum can drop as low as 1°C (34°F). This climate makes it ideal for travelers seeking diverse weather experiences, so make sure to pack accordingly!

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

The chart illustrates September temperature patterns in Twisp, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Twisp, September typically has an average temperature of 14°C (58°F), with highs reaching up to 34°C (93°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec252535435462696858433426
Data source: Temperature data for Twisp 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 Twisp

In Twisp in September, the precipitation amount is 30 mm (1.2 in) over the course of 5 days.

September Precipitation Trends in Twisp

The chart displays monthly precipitation patterns in Twisp, 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 Twisp, September typically receives around 30 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec9675594838185530668394
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Twisp

In Twisp in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.

September Average Humidity in Twisp

This chart illustrates the average monthly humidity levels in Twisp, 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 Twisp is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Twisp

In Twisp 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 Twisp.

Maximum UV Index Levels in Twisp for September

The chart shows the monthly maximum UV Index (UVI) for Twisp 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 Twisp typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246799997532
Data source: Twisp 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 Twisp Compares to Other Months

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

This table compares monthly weather conditions in Twisp, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)96 mm (3.8 inches)87%low
February Weather-4°C (25°F)75 mm (3.0 inches)86%moderate
March Weather2°C (35°F)59 mm (2.3 inches)88%high
April Weather6°C (44°F)48 mm (1.9 inches)86%high
May Weather12°C (55°F)38 mm (1.5 inches)82%very high
June Weather17°C (62°F)18 mm (0.7 inches)82%very high
July Weather21°C (70°F)5 mm (0.2 inches)85%very high
August Weather20°C (69°F)5 mm (0.2 inches)77%very high
September Weather14°C (58°F)30 mm (1.2 inches)76%high
October Weather6°C (43°F)66 mm (2.6 inches)88%moderate
November Weather1°C (34°F)83 mm (3.3 inches)88%moderate
December Weather-3°C (26°F)94 mm (3.7 inches)89%low

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