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September Weather in Prineville, United States

Last updated: June 24, 2025

In September, the average temperature in Prineville, United States hovers around 16°C (61°F). Expect a range where the minimum can dip to 0°C (33°F) and the maximum can soar to 37°C (99°F). During this month, you can anticipate approximately 25 mm (1.0 in) of precipitation spread across 4 days, contributing to an average humidity level of 59%.

September Temperature in Prineville

In September in Prineville, the average temperature is 16°C (61°F). Maximum temperatures can reach 37°C (99°F), while minimums can drop as low as 0°C (33°F). Be prepared for a wide range of temperatures when traveling to Prineville this month.

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

The chart illustrates September temperature patterns in Prineville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Prineville, September typically has an average temperature of 16°C (61°F), with highs reaching up to 37°C (99°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec333439455463727161483933
Data source: Temperature data for Prineville 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 Prineville

In Prineville in September, the precipitation amount is 25 mm (1.0 in) over the course of 4 days.

September Precipitation Trends in Prineville

The chart displays monthly precipitation patterns in Prineville, 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 Prineville, September typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec6481545838203825425965
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Prineville

In Prineville in September, humidity is 59%. With an average temperature of 16°C (61°F), this humidity feels like a refreshing yet slightly damp embrace, making it a comfortable time for sightseeing and exploring, although you might want to carry a light jacket for the occasional chill.

September Average Humidity in Prineville

This chart illustrates the average monthly humidity levels in Prineville, 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 Prineville is approximately 59%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%85%80%82%79%63%59%78%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Prineville

In Prineville 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 Prineville.

Maximum UV Index Levels in Prineville for September

The chart shows the monthly maximum UV Index (UVI) for Prineville 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 Prineville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468101010108632
Data source: Prineville 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 Prineville Compares to Other Months

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

This table compares monthly weather conditions in Prineville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)64 mm (2.5 inches)86%moderate
February Weather1°C (34°F)81 mm (3.2 inches)87%moderate
March Weather4°C (39°F)54 mm (2.1 inches)86%high
April Weather7°C (46°F)58 mm (2.3 inches)85%very high
May Weather12°C (54°F)38 mm (1.5 inches)80%very high
June Weather17°C (63°F)19 mm (0.8 inches)82%very high
July Weather22°C (72°F)2 mm (0.1 inches)78%very high
August Weather21°C (71°F)8 mm (0.3 inches)62%very high
September Weather16°C (61°F)25 mm (1.0 inches)59%very high
October Weather9°C (48°F)42 mm (1.6 inches)78%high
November Weather4°C (40°F)59 mm (2.3 inches)88%moderate
December Weather1°C (33°F)65 mm (2.6 inches)88%low

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