September Weather in Seward, United States

Last updated: February 24, 2025

September in Seward, United States, offers a cool and moist climate as summer transitions to fall. With maximum temperatures reaching 15°C (59°F) and an average of 8°C (46°F), the weather can be brisk, particularly at night when temperatures drop to a chilly minimum of -1°C (31°F). This month is characterized by significant precipitation, totaling 314 mm (12.4 in) over approximately 18 days, contributing to a notably humid environment with levels soaring around 90%. Whether exploring the vibrant landscapes or preparing for the upcoming winter, visitors will find that September's weather paints Seward in a fascinating blend of cool air and lush greenery.

September Temperature in Seward

As September rolls into Seward, United States, temperatures begin to show the first hints of autumn. With minimum temperatures averaging around -1°C (31°F) and maximums reaching up to 15°C (59°F), there's a noticeable shift from the warmer summer months. The average temperature of 8°C (46°F) signifies a gentle decline as the vibrant foliage starts to take center stage. This month offers a refreshing blend of cool breezes and crisp air, paving the way for the approaching chill of October. Overall, September in Seward provides a pleasant transitional experience, perfect for enjoying outdoor activities while surrounded by the stunning Alaskan landscape.

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.
JanFebMarAprMayJunJulAugSepOctNovDec262727343946515146382930
Data source: Temperature data for Seward generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Seward

In Seward, September marks a significant rise in precipitation, with 314 mm (12.4 in) falling over 18 days, making it one of the wettest months of the year. This spike continues the trend from the previous months, where rainfall begins to accumulate rapidly from May onwards. While the summer months of June to August exhibit relatively lower precipitation, September's increase sets the stage for even wetter conditions in October, which averages a staggering 438 mm (17.3 in). As the seasons shift, this pattern highlights the transition from the drier summer to the more deluge-prone autumn, emphasizing Seward's dynamic climate and its coastal influences.

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.
JanFebMarAprMayJunJulAugSepOctNovDec264166177187276150161193314438334425
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Seward

In September, Seward, United States, experiences a notable drop in humidity compared to the sweltering summer months, settling at a comfortable 90%. This slight decrease follows an exceptionally humid July and August, where levels peak at 97% and 94%, respectively. The trend indicates that as summer fades, the air becomes less oppressive, providing a refreshing change before the autumn breezes fully take over. However, September's humidity remains relatively high compared to the upcoming fall months, such as October's 84%, ensuring that the coastal charm and waterside beauty of Seward are still very much alive in the early days of fall. This ongoing high humidity throughout the year, peaking in mid-summer, highlights Seward's maritime climate and its capacity for moisture retention even as temperatures cool.

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, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%87%80%89%95%97%94%91%84%88%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seward

As September rolls into Seward, the UV Index settles at 4, indicating a moderate exposure level. This shift from the high readings of summer—peaking at 7 in July—signals a gradual retreat of the sun’s intensity. With a burn time of 30 minutes, residents and visitors are reminded to enjoy the outdoors while taking precautions against overexposure. Compared to earlier months, families can explore the stunning fall scenery with a bit more confidence, though it's wise to stay vigilant about UV safety. For more detailed information, visit Seward UV Index.

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.
JanFebMarAprMayJunJulAugSepOctNovDec123466764211
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.

September Sunshine in Seward

In September, Seward basks in a comfortable 169 hours of sunshine, marking a transition from the vibrant summer months into the mellow embrace of fall. After basking in the brilliance of June and July, which each provided over 260 hours of sunlight, September's daylight diminishes as autumn approaches, yet still offers ample light for outdoor adventures. Contrasting sharply with the 31 hours of December’s bleakness, this month serves as a gentle reminder of summer's lingering warmth. With a steady decline following the vibrant summer months, September stands as a bridge to the softer hues of autumn, inviting residents and visitors alike to enjoy the last golden rays before winter's arrival.

Monthly Sunshine Duration in Seward: September Highlighted

The September sunshine duration represents the total number of hours Seward experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec50h114h200h223h206h271h265h246h169h106h88h31h
Data source: Seward September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Seward During September

In Seward, the likelihood of sunny weather varies significantly throughout the year, with September presenting a moderate 26% chance of sunshine. This percentage positions the month among the less sunny periods, following a brief peak in late summer with August's 37%. The trend reveals a drop from the vibrant spring months, where sunshine chances reach up to 43% in April. Interestingly, September's weather hints at the onset of fall, as the sun retreat begins, continuing into the chillier October at 18%. While it's not the sunniest time of year, September still holds its own, offering a blend of lingering warmth and the emerging hues of autumn.

Percentage of Sunny Days in September in Seward

The chart illustrates the percentage of sunny days in Seward throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Seward experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec21%31%42%43%25%24%20%37%26%18%34%26%
Data source: Seward September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Seward in September

As September rolls in, Seward, United States experiences a gentle transition in daylight duration, with the sun gracing the skies for 12 hours each day. Following the long summer days of June, which boasted an impressive 18 hours of sunlight, the daylight begins to wane, leading toward the cooler months ahead. This month marks a noticeable shift, as daylight diminishes from August's 15 hours, hinting at the approaching fall and winter seasons. The trend illustrates a gradual decrease in daylight as the year progresses, with each month after September seeing increasingly shorter days, culminating in the minimal daylight of December. The ebb and flow of light throughout the year not only showcases the beauty of nature's cycles but also inspires the vibrant autumn activities that Seward has to offer.

Average Daylight Hours in Seward for September

The chart illustrates the variation in daylight duration in Seward throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec6h 48m9h 10m11h 54m14h 41m17h 15m18h 44m17h 53m15h 28m12h 45m10h7h 26m5h 57m
Data source: Seward daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Seward

In September, Seward experiences a refreshing breeze with an average wind speed of 3.6 m/s (8 mph), marking a subtle increase from the languid summer months. This shift signals a transition as the winds pick up slightly from the earlier part of the year, where speeds dipped to a low of 2.0 m/s (5 mph) in both July and August. As the fall approaches, the wind prepares to regain its momentum, foreshadowing the brisk conditions of October and November, which typically see stronger gusts averaging over 4 m/s. This trend highlights the region's dynamic seasonal changes, where gentle summer breezes give way to more invigorating winds, inviting a sense of exploration as nature shifts gears.

Average September Wind Speed in Seward

The chart displays monthly wind speed patterns in Seward, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.83.84.63.32.12.12.02.43.6 m/s3.54.44.7
Data source: Seward September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Seward Compares to Other Months

The weather in Seward changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Seward and find detailed weather information for every month.

September and January present quite contrasting weather conditions. In September, temperatures range from a chilly -1°C (31°F) at night to a mild 15°C (59°F) during the day, with an average temperature of 8°C (46°F). The month is characterized by significant rainfall, accumulating to 314 mm (12.4 in) over 18 days, accompanied by high humidity levels around 90%.

In contrast, January is much colder, with temperatures dipping to a minimum of -15°C (6°F) and peaking at just 4°C (39°F), leading to an average of -3°C (26°F). While January sees a lower total precipitation of 264 mm (10.4 in) over 15 days, the humidity remains nearly the same at 91%. For a closer look at the weather specifics in January, you can check out Seward weather in January.

September and February present contrasting weather patterns, both characterized by high humidity levels of 90%. September, with average temperatures ranging from -1°C (31°F) to a maximum of 15°C (59°F), is relatively milder, though it experiences significant rainfall, totaling 314 mm (12.4 in) over 18 days. In contrast, February is much colder, with temperatures typically varying from -12°C (10°F) to a maximum of 2°C (36°F) and less precipitation at 166 mm (6.5 in) over 14 days. While September invites more movement with its warmer temperatures and frequent rain, February’s chill creates a distinct wintry atmosphere. For more detailed insights into February weather, check out Seward weather in February.

In comparing the weather of September and March, September typically features milder temperatures, with a minimum of -1°C (31°F), an average of 8°C (46°F), and a maximum of 15°C (59°F). This transitional month also experiences significant rainfall, totaling 314 mm (12.4 in) over 18 days, accompanied by high humidity levels of 90%. In contrast, March is characterized by colder temperatures, with a minimum of -15°C (5°F), an average of -3°C (27°F), and a maximum of only 5°C (42°F). Precipitation in March is less, totaling 177 mm (7.0 in) across 13 days, with slightly lower humidity at 87%. For a detailed look at the weather specifics in Seward during March, you can visit Seward weather in March.

In comparing the weather of September and April, it becomes evident that September is generally milder, with average temperatures reaching 8°C (46°F) and maximums of 15°C (59°F). In contrast, April experiences cooler temperatures, averaging around 1°C (34°F) and peaking at 8°C (47°F). Additionally, September sees significantly higher precipitation levels at 314 mm (12.4 in) over 18 days, compared to April's 187 mm (7.4 in) over 16 days. Humidity is also higher in September at 90%, while April's humidity sits at 80%. For more detailed information, you can refer to Seward weather in April.

When comparing the weather in September and May, we see some notable differences. In September, temperatures range from a chilly minimum of -1°C (31°F) to an average of 8°C (46°F) and a maximum of 15°C (59°F), leading to a cooler overall feel as fall sets in. The month also experiences higher precipitation, with 314 mm (12.4 in) over 18 days and humidity levels at 90%. In contrast, May presents slightly milder conditions with temperatures starting at -1°C (31°F), averaging 4°C (39°F), and reaching a maximum of 14°C (57°F). Although May has a bit less rainfall at 276 mm (10.9 in) across 21 days, the humidity remains high at 89%. For a closer look at the conditions during May, you can visit Seward weather in May.

In comparing the weather of September and June, we observe notable differences in temperature and precipitation. September experiences cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 15°C (59°F), while June enjoys a milder range, boasting a minimum of 3°C (37°F) and a maximum of 21°C (69°F). Additionally, September is significantly wetter, receiving an average of 314 mm (12.4 in) of rainfall over 18 days, compared to June's 150 mm (5.9 in) across 15 days. Humidity levels are high in both months, reaching 90% in September and 95% in June. For those curious about the specifics of June weather in Seward, you can find more information here: Seward weather in June.

In comparing the weather of September and July, it's clear that September experiences cooler temperatures with a minimum of -1°C (31°F) and an average of 8°C (46°F), while July is significantly warmer, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 21°C (70°F). Precipitation is also much higher in September, totaling 314 mm (12.4 in) over 18 days, compared to July's 161 mm (6.3 in) over 14 days. Additionally, humidity levels are notably high in both months, with September at 90% and July slightly higher at 97%. For more detailed insights, you can check Seward weather in July.

In comparing the weather between September and August, September exhibits significantly cooler temperatures, with a minimum of -1°C (31°F) and an average of 8°C (46°F), compared to August's minimum of 5°C (40°F) and average of 11°C (51°F). While both months experience considerable precipitation, September sees a marked increase with 314 mm (12.4 in) over 18 days, in contrast to August's 193 mm (7.6 in) over 16 days. Humidity remains relatively high in both months, with September at 90% and August slightly higher at 94%. For more detailed insights on August weather, check out Seward weather in August.

In September, temperatures gradually transition from a mild average of 8°C (46°F) to a maximum of 15°C (59°F), with precipitation occurring on 18 days, totaling 314 mm (12.4 in) and a humidity level of 90%. As we move into October, the weather becomes noticeably colder, with average temperatures dropping to 3°C (38°F) and maximums reaching only 11°C (52°F). The month sees an increase in precipitation, accumulating to 438 mm (17.3 in) over 21 days, while humidity decreases slightly to 84%. For more detailed insights, check out the Seward weather in October.

September and November present stark contrasts in weather conditions. In September, temperatures range from a minimum of -1°C (31°F) to a maximum of 15°C (59°F), with an average of 8°C (46°F). This month experiences significant precipitation, totaling 314 mm (12.4 in) over 18 days, coupled with high humidity at 90%. In contrast, November chills the air further, with temperatures dropping to a minimum of -16°C (3°F) and an average of -2°C (30°F), peaking at just 6°C (43°F). Although November has slightly more precipitation at 334 mm (13.1 in) over 16 days, the humidity is slightly lower at 88%. For more detailed information, check out Seward weather in November.

September and December show marked differences in weather conditions. In September, temperatures range from a chilly minimum of -1°C (31°F) to a maximum of 15°C (59°F), with an average of 8°C (46°F). The month experiences significant rainfall, totaling 314 mm (12.4 inches) over 18 days, while maintaining a high humidity level of 90%. In contrast, December is notably colder, with temperatures plunging to a minimum of -15°C (5°F) and an average temperature of -1°C (30°F), peaking at just 5°C (41°F). Precipitation increases to 425 mm (16.7 inches) across 23 days, but the humidity remains consistent at 90%. This transition marks a shift from the comparatively mild and wet September to the frigid and wetter December. For more detailed information, check this link: Seward weather in December.

Compare Seward's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Seward

As summer fades away, September in Seward heralds a noticeable shift in weather marked by cooler temperatures and increased precipitation. This month is characterized by a damp ambiance, with high humidity and frequent rainy days, creating a contrast to the drier, warmer conditions of July and August. The maximum temperatures drop significantly, leading to chilly nights that can even flirt with freezing. This change not only alters the landscape but also suggests the oncoming fall, making it an intriguing time for visitors to experience Seward's natural beauty. For a more in-depth look at what to expect throughout the year, delve into the full details at Seward Climate.