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September Weather in Johnson, United States

Last updated: June 24, 2025

In Johnson, United States, the average temperature in September is a comfortable 15°C (59°F). However, be prepared for a range of temperatures, as the minimum can drop to -5°C (24°F), while the maximum can soar to 31°C (87°F). Expect some rain, with an average precipitation of 87 mm (3.4 in) spread over 11 days. Additionally, the average humidity hovers around 78%, adding a bit of moisture to the air.

September Temperature in Johnson

In September in Johnson, the average temperature is 15°C (59°F), with maximums reaching 31°C (87°F) and minimums dropping as low as -5°C (24°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack clothing suitable for both warm days and chilly evenings.

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

The chart illustrates September temperature patterns in Johnson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Johnson, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (87°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec182028415563696759483323
Data source: Temperature data for Johnson 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 Johnson

In Johnson in September, the precipitation amount is 87 mm (3.4 in) over the course of 11 days.

September Precipitation Trends in Johnson

The chart displays monthly precipitation patterns in Johnson, 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 Johnson, September typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9792921241091161411158716513193
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Johnson

In Johnson in September, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

September Average Humidity in Johnson

This chart illustrates the average monthly humidity levels in Johnson, 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 Johnson is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%86%85%80%74%76%75%78%86%89%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Johnson

In Johnson 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 Johnson.

Maximum UV Index Levels in Johnson for September

The chart shows the monthly maximum UV Index (UVI) for Johnson 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 Johnson typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Johnson 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 Johnson Compares to Other Months

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

This table compares monthly weather conditions in Johnson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)96 mm (3.8 inches)93%low
February Weather-6°C (21°F)92 mm (3.6 inches)92%moderate
March Weather-2°C (28°F)92 mm (3.6 inches)86%moderate
April Weather5°C (42°F)124 mm (4.9 inches)85%high
May Weather13°C (55°F)109 mm (4.3 inches)80%very high
June Weather17°C (64°F)116 mm (4.6 inches)74%very high
July Weather20°C (69°F)141 mm (5.6 inches)76%very high
August Weather19°C (67°F)115 mm (4.5 inches)75%very high
September Weather15°C (59°F)87 mm (3.4 inches)78%high
October Weather9°C (48°F)165 mm (6.5 inches)86%moderate
November Weather0°C (33°F)131 mm (5.2 inches)88%moderate
December Weather-5°C (23°F)92 mm (3.6 inches)89%low

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