September Weather in Seaside, United States

Last updated: February 24, 2025

September in Seaside, United States, brings a delightful blend of warm and mild weather, perfect for outdoor activities. With maximum temperatures soaring to 34°C (93°F) and an average temperature of 17°C (62°F), the month is characterized by sunny days and comfortable evenings. The minimum temperature dips to a cool 8°C (47°F), providing a refreshing contrast. Remarkably, September experiences 0 days of precipitation, accumulating only 6 mm (0.3 in) of rain, making it an ideal time for beachgoers and nature enthusiasts. Additionally, with a humidity level of 55%, the climate remains pleasant, inviting residents and visitors alike to make the most of the seaside charm.

September Temperature in Seaside

As September unfolds in Seaside, United States, it marks a transitional period where summer's warmth lingers just a little longer. With minimum temperatures hovering around 8°C (47°F) and peak averages reaching a sizzling 34°C (93°F), this month sees a significant increase in warmth compared to the rest of the year. The average temperature settles comfortably at 17°C (62°F), providing a pleasant climate for beach outings and outdoor activities. Interestingly, while the maximum temperature hits its high for the year, the crisp evenings remind you that autumn is just around the corner. This delightful blend of summer's warmth and fall's approach makes September a perfect time to enjoy Seaside's stunning scenery.

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

The chart illustrates September temperature patterns in Seaside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505051535559616362595450
Data source: Temperature data for Seaside 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 Seaside

In Seaside, United States, September marks a notable shift in weather patterns, with precipitation levels remaining quite low at just 6 mm (0.3 in), a stark contrast to the wetter months earlier in the year. Following a dry summer, where July and August recorded no rainfall, September maintains this dryness, with 0 precipitation days. This trend of descending rainfall is particularly significant when we consider the robust precipitation seen at the beginning of the year; for instance, January alone received 113 mm (4.5 in) across 8 days. As the year progresses into October and November, a resurgence in precipitation is expected, hinting at the cyclical nature of Seaside's climate, which transitions from dry to damp as the autumn months approach.

September Precipitation Trends in Seaside

The chart displays monthly precipitation patterns in Seaside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1139499332332261941100
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Seaside

In Seaside, United States, September marks a notable shift in humidity compared to the balmy summer months. As summer winds down, the average humidity drops to 55%, reflecting a gradual decrease from the peak of 54% in August. This trend of lower humidity levels is evident as the year progresses; starting from a high of 84% in February, the humidity steadily declines through the warmer months, reaching its lowest point in September before beginning to rise again in October. This transition not only signals the change of seasons but also offers residents and visitors a refreshing reprieve from the sticky summer air, making early fall a delightful time to enjoy the coastal charm of Seaside.

September Average Humidity in Seaside

This chart illustrates the average monthly humidity levels in Seaside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Seaside

As summer transitions to autumn in Seaside, United States, the UV Index begins to decline, yet September still boasts a very high UV Index of 9. This means sunbathers should be cautious, as the risk for skin damage persists with a burn time of just 15 minutes. Following the peak of summer, where extreme levels were common, September marks a slight reduction in intensity, though the sun remains potent. As the months progress from sunny September to cooler October, the UV Index will further decrease, indicating a shift in the sun’s strength. For those planning outdoor activities, staying informed about the UV Index is essential for safe sun exposure. For more details, visit Seaside UV Index.

Maximum UV Index Levels in Seaside for September

The chart shows the monthly maximum UV Index (UVI) for Seaside 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.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119753
Data source: Seaside 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 Seaside

As summer transitions to fall, September in Seaside, United States, enjoys a generous 314 hours of sunshine, making it one of the sunniest months of the year. This marks a slight decline from the vibrant peak of July, which boasts a dazzling 388 hours, yet still outshines the earlier months. The sun-kissed days of September are a harmonious blend of warmth and mildness, as the sunlight begins to soften, hinting at the approaching autumn. Overall, the trend of increasing sunshine from the winter months culminates in a delightful September, setting the stage for nature's colorful transformation while still soaking in the residual warmth of summer.

Monthly Sunshine Duration in Seaside: September Highlighted

The September sunshine duration represents the total number of hours Seaside 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.
JanFebMarAprMayJunJulAugSepOctNovDec163h220h264h302h359h376h388h357h314h289h235h209h
Data source: Seaside September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Seaside During September

In Seaside, United States, September marks the continuation of a delightful trend in sunny weather, boasting a remarkable 75% chance of sunshine. This figure aligns seamlessly with the preceding months of July and August, where sunny days peak at 62% and 75%, respectively. As the summer winds down, September encapsulates the essence of late summer, providing long, sunlit days perfect for outdoor activities. Following this warm month, the likelihood of sunshine begins to taper off into the fall, with October dropping to 61%. Enjoy the vibrant sunsets and clear skies in September, as they are a fitting send-off to the summer season!

Percentage of Sunny Days in September in Seaside

The chart illustrates the percentage of sunny days in Seaside 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 Seaside experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%55%49%53%67%69%62%75%75%61%58%44%
Data source: Seaside September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Seaside in September

As summer fades and September arrives in Seaside, the daylight starts to gently wane, providing a perfect transition into fall. With 12 hours of daylight, September marks a slight dip from the vibrant 14 hours experienced in the peak months of May through August. This gradual decrease heralds the return of shorter days but still offers ample sunlight for outdoor adventures. The trend shows a steady march toward winter, as daylight diminishes from the long, sunlit days of summer down to 9 hours in January. Nevertheless, September's rich, golden light lingers just enough to encourage lingering strolls along the shore and a farewell to the warmth of summer.

Average Daylight Hours in Seaside for September

The chart illustrates the variation in daylight duration in Seaside throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 58m10h 51m11h 59m13h 9m14h 7m14h 36m14h 20m13h 28m12h 21m11h 11m10h 11m9h 41m
Data source: Seaside daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Seaside

As September rolls into Seaside, the average wind speed takes a gentle dip to 2.0 m/s (5 mph), marking the year's most tranquil month for breezes. This decrease follows the gradual decline seen since the summer months, where winds peaked at 2.2 m/s in July and 2.1 m/s in August. The transition into autumn introduces a quieter atmosphere, as the vibrant summer gusts give way to a serene and steady breeze. Notably, this lull in wind speed contrasts with the slight increase seen in the months just before, hinting at the calm before the more variable conditions often found in the fall. As October approaches, Seaside can expect a return to a brisk 2.6 m/s (6 mph), signifying the ever-changing dance of seasonal winds along the coast.

Average September Wind Speed in Seaside

The chart displays monthly wind speed patterns in Seaside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.62.82.82.83.02.72.22.12.0 m/s2.62.22.9
Data source: Seaside September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Seaside Compares to Other Months

The weather in Seaside 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 Seaside and find detailed weather information for every month.

September and January exhibit strikingly different weather patterns. September boasts a warm average temperature of 17°C (62°F), with maximums reaching up to 34°C (93°F) and minimal precipitation, showcasing a dry and comfortable atmosphere. In contrast, January features cooler temperatures, averaging 10°C (51°F) with highs of 21°C (70°F) and significantly more precipitation at 113 mm (4.5 in) spread across 8 days, resulting in a much more humid environment at 82%. For a detailed look at January weather, you can visit Seaside weather in January.

September and February showcase contrasting weather patterns. In September, temperatures range from a mild 8°C (47°F) at night to a warm 34°C (93°F) during the day, with an average of 17°C (62°F) and minimal precipitation of just 6 mm (0.3 in) over no rainy days. Humidity is relatively moderate at 55%. In sharp contrast, February experiences cooler temperatures, dropping to a minimum of 0°C (32°F) and peaking at 23°C (73°F), with an average of 10°C (50°F). This month is significantly wetter, accumulating 94 mm (3.7 in) of rain over 9 days and a higher humidity level at 84%. For more detailed information, you can refer to the Seaside weather in February.

When comparing the weather in September and March, notable differences emerge. September tends to be warmer, with average temperatures around 17°C (62°F) and maximum highs reaching up to 34°C (93°F), accompanied by minimal precipitation of just 6 mm (0.3 in) over no rainy days. In contrast, March experiences cooler temperatures, with an average of 10°C (51°F) and a maximum of 23°C (73°F), but it is much wetter, with 99 mm (3.9 in) of precipitation spread over 13 days. Additionally, March has higher humidity levels at 82%, compared to September’s 55%. For more specific insights into the coastal climate, check Seaside weather in March.

In comparing the weather of September and April, September generally enjoys a warmer temperament with average temperatures around 17°C (62°F) and highs reaching up to 34°C (93°F). In contrast, April experiences cooler conditions, with an average of 12°C (53°F) and maximum temperatures capping at 26°C (79°F). Precipitation is notably lower in September, with just 6 mm (0.3 in) across no rainy days, while April sees a significantly wetter climate with 33 mm (1.3 in) spread over five days. Additionally, humidity levels are higher in April at 78%, compared to September's 55%. For a more detailed look at what to expect, you can check out Seaside weather in April.

In September, the weather features a wide temperature range with minimums around 8°C (47°F) and maximums reaching up to 34°C (93°F), offering warm, sunny days. The average temperature is a pleasant 17°C (62°F), and with only 6 mm (0.3 in) of precipitation across zero days, it remains relatively dry at a humidity level of 55%. In contrast, May experiences cooler temperatures, with a minimum of 5°C (40°F) and a maximum of 25°C (78°F). The average temperature in May is 13°C (55°F), and it sees more precipitation, totaling 23 mm (0.9 in) over three days, with higher humidity at 71%. For a closer look at what to expect, you can explore Seaside weather in May.

In comparing the weather of September and June, September tends to be warmer overall, with average temperatures reaching 17°C (62°F) and maximums climbing to 34°C (93°F). June, on the other hand, has slightly cooler temperatures, averaging 15°C (59°F) with a peak of 29°C (84°F). Both months experience very little precipitation, with September having 6 mm (0.3 in) and June only 3 mm (0.1 in), making them relatively dry. Additionally, humidity levels are slightly lower in September at 55%, compared to June's 64%. For a closer look at seaside conditions during this month, you can check out Seaside weather in June.

September typically offers a wider temperature range compared to July, with minimums of 8°C (47°F) and maximums reaching 34°C (93°F), while July sees a milder range, from a minimum of 9°C (49°F) to a maximum of 26°C (79°F). Both months experience low levels of precipitation, with September receiving just 6 mm (0.3 in) and July slightly less at 2 mm (0.1 in), with no rainy days recorded in either month. Additionally, September’s average humidity of 55% is slightly lower than July's 58%, contributing to a slightly drier feel. For more details on the weather specifics in July, you can refer to Seaside weather in July.

In comparing the weather between September and August, September tends to experience slightly cooler temperatures with a minimum of 8°C (47°F) compared to August's minimum of 10°C (51°F). The average temperatures are similar, resting at around 17°C (62°F) in both months, but September boasts a higher maximum temperature of 34°C (93°F) compared to August's maximum of 30°C (87°F). Precipitation levels are relatively low in both months, with September receiving just 6 mm (0.3 in) and August only 2 mm (0.1 in), and neither month recording any rainy days. Humidity remains fairly consistent, with September at 55% and August at 54%. For those interested in the seaside climate, more details can be found in this link: Seaside weather in August.

September typically brings warm temperatures, with a minimum of 8°C (47°F), an average of 17°C (62°F), and a maximum reaching 34°C (93°F). The month is characterized by little rainfall, recording only 6 mm (0.3 in) over no rainy days and a comfortable humidity level of 55%. In contrast, October sees cooler temperatures, with a minimum of 6°C (42°F), an average of 15°C (59°F), and a maximum of 31°C (88°F). Precipitation increases to 19 mm (0.7 in) across just one day, and humidity rises slightly to 62%. This shift marks October as a transition into a wetter and cooler season. For more detailed information on the weather in this month, check out Seaside weather in October.

September's weather is characterized by warmer temperatures, with averages reaching up to 17°C (62°F) and highs soaring as high as 34°C (93°F). It enjoys relatively dry conditions, with only 6 mm of precipitation over the month. In contrast, November brings a significant shift; temperatures drop, with an average of 12°C (55°F) and a maximum of 24°C (76°F). The month is much wetter, experiencing 40 mm of rainfall over the course of 4 days, and humidity levels increase to 78%. For more insights on November weather, you can check out Seaside weather in November.

September weather typically offers a warmer climate, with average temperatures around 17°C (62°F) and highs reaching up to 34°C (93°F). This month is characterized by low precipitation levels, averaging just 6 mm, and a relatively comfortable humidity of 55%. In contrast, December brings a noticeable chill, with average temperatures dropping to 10°C (51°F) and minimums often dipping to 1°C (34°F). This month sees a significant increase in precipitation, totaling around 100 mm over approximately 8 days, accompanied by higher humidity at 80%. For more details on December weather, you can visit Seaside weather in December.

Compare Seaside's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Seaside

As the summer sun begins to mellow in September, Seaside experiences a delightful transition in weather. Unlike the scorching peak of summer, this month offers pleasantly warm temperatures, making outdoor activities more enjoyable without the sweltering heat. With minimal precipitation and a comfortable humidity level of 55%, it's an ideal time to explore the coastal landscapes. The dry conditions paired with mild nights beckon locals and visitors alike to enjoy the beauty of Seaside’s natural surroundings. For a deeper understanding of what to expect in Seaside throughout the year, check out Seaside Climate.