September Weather in Johnson, United States

Last updated: June 24, 2025

In Johnson, United States, the average temperature in September hovers around 22°C (73°F), with minima dipping to 2°C (36°F) and maxima soaring up to 40°C (105°F). During this month, you can expect about 34 mm (1.3 in) of precipitation spread over 4 days, contributing to an average humidity of 79%. Prepare accordingly for a blend of warmth and occasional rain!

September Temperature in Johnson

In September, in Johnson, the average temperature is 22°C (73°F). The maximum can reach 40°C (105°F), while the minimum can be as low as 2°C (36°F). It's advisable to pack a variety of clothing to accommodate the wide temperature range during your travels.

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 22°C (73°F), with highs reaching up to 40°C (105°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec353548556477807772564638
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 34 mm (1.3 in) over a span of 4 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 34 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec15133844843839603429819
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 79%. With an average temperature of 22°C (73°F), this humidity feels like a warm, muggy embrace that makes outdoor activities feel more taxing, and a quick stroll can leave you feeling slightly sticky and ready for a refreshing break.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec74%77%65%67%81%82%82%84%79%75%79%83%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec458101112121110753
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 Weather2°C (35°F)15 mm (0.6 inches)74%moderate
February Weather2°C (36°F)13 mm (0.5 inches)77%moderate
March Weather9°C (48°F)38 mm (1.5 inches)65%very high
April Weather13°C (55°F)44 mm (1.7 inches)67%very high
May Weather18°C (65°F)84 mm (3.3 inches)81%extreme
June Weather25°C (77°F)38 mm (1.5 inches)82%extreme
July Weather27°C (81°F)38 mm (1.5 inches)82%extreme
August Weather25°C (78°F)60 mm (2.4 inches)84%extreme
September Weather22°C (73°F)34 mm (1.3 inches)79%very high
October Weather14°C (57°F)29 mm (1.1 inches)75%high
November Weather8°C (47°F)8 mm (0.3 inches)79%moderate
December Weather3°C (38°F)19 mm (0.8 inches)83%moderate

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