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September Weather in Seward, United States

Last updated: June 24, 2025

In Seward, United States, the average temperature in September hovers around 21°C (70°F). Expect a wide temperature range, with minimums dipping to 5°C (42°F) and maximums soaring to 36°C (97°F). During this month, precipitation typically reaches 73 mm (2.9 in) over about 8 days, accompanied by an average humidity of 75%. Be prepared for a mix of warm days and rainy spells!

September Temperature in Seward

In September in Seward, the average temperature is 21°C (70°F). Maximum temperatures can reach 36°C (97°F), while the minimum can drop as low as 5°C (42°F). Travelers should be prepared for a wide range of weather conditions, ensuring they pack both warm and light clothing.

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

The chart illustrates September temperature patterns in Seward, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seward, September typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (97°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec262641506376797570534132
Data source: Temperature data for Seward 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 Seward

In Seward in September, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Seward

The chart displays monthly precipitation patterns in Seward, 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 Seward, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec322696491441086991731102741
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seward

In Seward in September, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

September Average Humidity in Seward

This chart illustrates the average monthly humidity levels in Seward, 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 Seward is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seward

In Seward 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 Seward.

Maximum UV Index Levels in Seward for September

The chart shows the monthly maximum UV Index (UVI) for Seward 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 Seward typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35699101098642
Data source: Seward 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 Seward Compares to Other Months

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

This table compares monthly weather conditions in Seward, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)32 mm (1.3 inches)76%moderate
February Weather-3°C (26°F)26 mm (1.0 inches)80%moderate
March Weather5°C (42°F)95 mm (3.8 inches)73%high
April Weather10°C (51°F)49 mm (1.9 inches)74%very high
May Weather17°C (63°F)144 mm (5.7 inches)78%very high
June Weather25°C (77°F)108 mm (4.2 inches)82%very high
July Weather26°C (79°F)69 mm (2.7 inches)83%very high
August Weather24°C (75°F)91 mm (3.6 inches)80%very high
September Weather21°C (70°F)73 mm (2.9 inches)75%very high
October Weather11°C (53°F)110 mm (4.3 inches)75%high
November Weather5°C (41°F)27 mm (1.1 inches)82%moderate
December Weather0°C (32°F)41 mm (1.6 inches)83%low

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