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September Weather in Port Orchard, United States

Last updated: June 24, 2025

In Port Orchard, United States, the average temperature in September settles at a mild 17°C (63°F). Daytime highs can soar to a warm 30°C (87°F), while nights may drop to a cooler 8°C (47°F). Expect 90 mm (3.6 in) of precipitation spread over 13 days, contributing to a 74% average humidity that adds to the region's lush atmosphere.

September Temperature in Port Orchard

In September in Port Orchard, the average temperature is 17°C (63°F). The maximum can reach 30°C (87°F), while the minimum can be as low as 8°C (47°F). This makes it a great time for travelers to enjoy a mix of warm days and cool evenings.

September Weather in Port Orchard: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Port Orchard, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Orchard, September typically has an average temperature of 17°C (63°F), with highs reaching up to 30°C (87°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec434145505662676862534843
Data source: Temperature data for Port Orchard 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 Port Orchard

In Port Orchard in September, the precipitation amount is 90 mm (3.6 in), occurring over the course of 13 days.

September Precipitation Trends in Port Orchard

The chart displays monthly precipitation patterns in Port Orchard, 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 Port Orchard, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1791461191026764262490145181194
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Port Orchard

In Port Orchard in September, humidity is 74%. With an average temperature of 17°C (63°F), this humidity feels like a gentle embrace, making outdoor exploration comfortable yet slightly enveloped in warmth, perfect for leisurely strolls but requiring ample hydration for prolonged activities.

September Average Humidity in Port Orchard

This chart illustrates the average monthly humidity levels in Port Orchard, 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 Port Orchard is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Port Orchard

In Port Orchard 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 Port Orchard.

Maximum UV Index Levels in Port Orchard for September

The chart shows the monthly maximum UV Index (UVI) for Port Orchard 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 Port Orchard typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Port Orchard 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 Port Orchard Compares to Other Months

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

This table compares monthly weather conditions in Port Orchard, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)179 mm (7.0 inches)86%low
February Weather5°C (42°F)146 mm (5.7 inches)84%moderate
March Weather7°C (45°F)119 mm (4.7 inches)85%moderate
April Weather10°C (50°F)102 mm (4.0 inches)83%high
May Weather13°C (56°F)67 mm (2.6 inches)84%very high
June Weather16°C (62°F)64 mm (2.5 inches)84%very high
July Weather19°C (67°F)26 mm (1.0 inches)82%very high
August Weather20°C (68°F)24 mm (0.9 inches)73%very high
September Weather17°C (63°F)90 mm (3.6 inches)74%high
October Weather12°C (54°F)145 mm (5.7 inches)83%moderate
November Weather9°C (48°F)181 mm (7.1 inches)86%moderate
December Weather6°C (43°F)194 mm (7.6 inches)87%low

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