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September Weather in Coupeville, United States

Last updated: June 24, 2025

In September, the average temperature in Coupeville, United States hovers around 14°C (58°F). Expect a minimum of 10°C (51°F) and a maximum of 22°C (72°F) throughout the month. Be prepared for 87 mm (3.4 in) of precipitation spread over 12 days, contributing to an average humidity of 76%. Stay cozy and ready for those occasional showers!

September Temperature in Coupeville

In September in Coupeville, the average temperature is 14°C (58°F). Maximums can reach 22°C (72°F), while minimums can be as low as 10°C (51°F). This climate makes it a great time to explore Coupeville, offering pleasant weather for outdoor activities.

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

The chart illustrates September temperature patterns in Coupeville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Coupeville, September typically has an average temperature of 14°C (58°F), with highs reaching up to 22°C (72°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec444245495357596158524844
Data source: Temperature data for Coupeville 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 Coupeville

In Coupeville in September, the precipitation amount is 87 mm (3.4 in) over the course of 12 days.

September Precipitation Trends in Coupeville

The chart displays monthly precipitation patterns in Coupeville, 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 Coupeville, September typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec150154118865453282687133189177
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Coupeville

In Coupeville in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.

September Average Humidity in Coupeville

This chart illustrates the average monthly humidity levels in Coupeville, 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 Coupeville is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%86%86%81%83%84%77%76%88%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Coupeville

In Coupeville 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 Coupeville.

Maximum UV Index Levels in Coupeville for September

The chart shows the monthly maximum UV Index (UVI) for Coupeville 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 Coupeville typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987521
Data source: Coupeville 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 Coupeville Compares to Other Months

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

This table compares monthly weather conditions in Coupeville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)150 mm (5.9 inches)86%low
February Weather6°C (42°F)154 mm (6.1 inches)85%moderate
March Weather7°C (45°F)118 mm (4.6 inches)86%moderate
April Weather9°C (49°F)86 mm (3.4 inches)86%high
May Weather12°C (54°F)54 mm (2.1 inches)81%very high
June Weather14°C (57°F)53 mm (2.1 inches)83%very high
July Weather15°C (60°F)28 mm (1.1 inches)84%very high
August Weather16°C (61°F)26 mm (1.0 inches)77%very high
September Weather14°C (58°F)87 mm (3.4 inches)76%high
October Weather11°C (53°F)133 mm (5.2 inches)88%moderate
November Weather9°C (48°F)189 mm (7.4 inches)87%low
December Weather7°C (44°F)177 mm (7.0 inches)87%low

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