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September Weather in Lyman, United States

Last updated: June 24, 2025

In Lyman, United States, the average temperature in September hovers around 14°C (58°F). Expect potential extremes, with minimums plunging to -5°C (23°F) and maximums soaring to 32°C (90°F). Precipitation is quite modest, with about 29 mm (1.2 in) spread over 5 days, and the average humidity sits at a comfortable 46%.

September Temperature in Lyman

In September in Lyman, the average temperature is 14°C (58°F), with maximums reaching 32°C (90°F) and minimums dropping as low as -5°C (23°F). This diverse range in temperatures makes Lyman an ideal destination for travelers seeking both warm and cool experiences during their visit.

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

The chart illustrates September temperature patterns in Lyman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lyman, September typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (90°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec222431394962696758423323
Data source: Temperature data for Lyman 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 Lyman

In Lyman in September, the precipitation amount is 29 mm (1.2 in) over a period of 5 days.

September Precipitation Trends in Lyman

The chart displays monthly precipitation patterns in Lyman, 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 Lyman, September typically receives around 29 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec303467506724152429303231
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lyman

In Lyman in September, humidity is 46%. With an average temperature of 14°C (58°F), this humidity feels like a refreshing yet slightly brisk breeze, making it quite pleasant for traveling as you can comfortably explore without feeling overheated.

September Average Humidity in Lyman

This chart illustrates the average monthly humidity levels in Lyman, 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 Lyman is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%92%84%75%62%56%44%37%46%67%84%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lyman

In Lyman in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Lyman.

Maximum UV Index Levels in Lyman for September

The chart shows the monthly maximum UV Index (UVI) for Lyman 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 Lyman typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Lyman 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 Lyman Compares to Other Months

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

This table compares monthly weather conditions in Lyman, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)30 mm (1.2 inches)91%moderate
February Weather-5°C (24°F)34 mm (1.3 inches)92%high
March Weather-1°C (31°F)67 mm (2.6 inches)84%very high
April Weather4°C (39°F)50 mm (2.0 inches)74%very high
May Weather9°C (49°F)67 mm (2.7 inches)62%extreme
June Weather17°C (62°F)24 mm (0.9 inches)56%extreme
July Weather21°C (70°F)15 mm (0.6 inches)44%extreme
August Weather19°C (67°F)24 mm (0.9 inches)37%extreme
September Weather14°C (58°F)29 mm (1.2 inches)46%very high
October Weather5°C (42°F)30 mm (1.2 inches)67%high
November Weather1°C (34°F)32 mm (1.2 inches)84%moderate
December Weather-5°C (23°F)31 mm (1.2 inches)88%moderate

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