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September Weather in John Day, United States

Last updated: June 24, 2025

In September, the average temperature in John Day, United States is a pleasant 14°C (58°F). However, be prepared for a range of temperatures; it can drop to a chilly -2°C (29°F) at the minimum and soar to a warm 35°C (96°F) at its peak. Expect an average precipitation of 31 mm (1.2 in) spread over about 5 days, with an overall humidity level of around 58%.

September Temperature in John Day

In September in John Day, the average temperature is 14°C (58°F). Maximums can reach 35°C (96°F) and minimums can be as low as -2°C (29°F). This diverse range means travelers should be prepared for both warm days and cool nights.

September Weather in John Day: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in John Day, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In John Day, September typically has an average temperature of 14°C (58°F), with highs reaching up to 35°C (96°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec272835415058696757443428
Data source: Temperature data for John Day 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 John Day

In John Day in September, the precipitation amount is 31 mm (1.2 in) spread over 5 days.

September Precipitation Trends in John Day

The chart displays monthly precipitation patterns in John Day, 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 John Day, September typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec701017880734131431566267
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in John Day

In John Day in September humidity is 58%. With an average temperature of 14°C (58°F), this humidity feels like a refreshing embrace, providing a pleasant contrast to the cooler air and making it a comfortable time for traveling and exploration.

September Average Humidity in John Day

This chart illustrates the average monthly humidity levels in John Day, 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 John Day is approximately 58%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in John Day

In John Day 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 John Day.

Maximum UV Index Levels in John Day for September

The chart shows the monthly maximum UV Index (UVI) for John Day 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 John Day typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110108642
Data source: John Day 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 John Day Compares to Other Months

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

This table compares monthly weather conditions in John Day, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)70 mm (2.7 inches)86%moderate
February Weather-2°C (29°F)101 mm (4.0 inches)86%moderate
March Weather2°C (35°F)78 mm (3.1 inches)85%high
April Weather5°C (41°F)80 mm (3.1 inches)83%very high
May Weather10°C (50°F)73 mm (2.9 inches)77%very high
June Weather15°C (59°F)41 mm (1.6 inches)81%extreme
July Weather20°C (69°F)3 mm (0.1 inches)76%very high
August Weather20°C (68°F)14 mm (0.6 inches)60%very high
September Weather14°C (58°F)31 mm (1.2 inches)58%very high
October Weather6°C (44°F)56 mm (2.2 inches)75%high
November Weather1°C (35°F)62 mm (2.4 inches)85%moderate
December Weather-2°C (28°F)67 mm (2.6 inches)87%low

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