September Weather in Forks, United States

Last updated: February 24, 2025

In September, Forks, Washington, experiences a mild climate characterized by a maximum temperature of 27°C (82°F) and an average of 14°C (58°F). The month welcomes the onset of autumn with minimum temperatures dropping to 6°C (43°F). Rainfall is a common theme, as the area witnesses 131 mm (5.1 in) of precipitation over 11 days, contributing to an overall humidity level of 74%. This blend of warmth and moisture sets the stage for Forks' lush landscapes, making it a unique destination during this transitional period.

September Temperature in Forks

September in Forks, United States marks a transition toward milder autumn temperatures, featuring a minimum of 6°C (43°F) and a comfortable average of 14°C (58°F). As summer's warmth lingers, the maximum reaches a pleasant 27°C (82°F), offering ideal conditions for outdoor activities before the chill of fall sets in. This month showcases a gradual cooling trend, with temperatures notably lower than the peak summer months of June and August, yet significantly more temperate compared to the preceding winter. The warming trend from July to September indicates an inviting climate for both residents and visitors eager to embrace the stunning natural beauty of the Pacific Northwest.

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

The chart illustrates September temperature patterns in Forks, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec434144485256585957514743
Data source: Temperature data for Forks 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 Forks

In September, Forks experiences a notable uptick in precipitation, receiving 131 mm (5.1 in) of rain over 11 days. This marks a significant increase from the drier summer months of July and August, which saw just 23 mm and 25 mm respectively. As the transition to autumn begins, the rainfall not only contributes to the lush greenery that the region is famous for but also sets the stage for the wetter months ahead. This pattern of increasing precipitation continues into October, suggesting that September serves as a bridge from the summer's dryness to the more saturated fall and winter seasons, where monthly totals peak in November.

September Precipitation Trends in Forks

The chart displays monthly precipitation patterns in Forks, 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.
JanFebMarAprMayJunJulAugSepOctNovDec28118918115368612325131219336293
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Forks

As summer gives way to fall in Forks, September experiences a notable dip in humidity, settling at 74%. This marks a contrast to the earlier months, particularly August, which boasts a higher humidity level of 73%. The transition signifies a gradual decrease from the sultry peaks of summer, where humidity was on the decline from a high of 82% in July. Interestingly, as the year progresses, Forks tends to have its most humid months during winter, with levels rising back to 86% in November and peaking at 87% in December. This pattern reveals a distinct seasonality in Forks' humidity, where the crispness of autumn brings a welcome respite from the moisture-laden air of the preceding summer months.

September Average Humidity in Forks

This chart illustrates the average monthly humidity levels in Forks, 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.
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 Forks

In Forks, United States, the UV Index in September reflects a significant shift from the peak summer months, showcasing a high exposure level of 7. This indicates a moderate risk of harm from unprotected sun exposure, with a burn time of 25 minutes for light-skinned individuals. Notably, as the summer sun wanes, the UV Index drops from the intense highs of 9 seen in June and July, but remains comparatively elevated, creating a perfect opportunity to enjoy the outdoors while still being mindful of sun safety. As fall approaches, it's essential to stay informed about changing conditions—check out more in detail at Forks UV Index.

Maximum UV Index Levels in Forks for September

The chart shows the monthly maximum UV Index (UVI) for Forks 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.
JanFebMarAprMayJunJulAugSepOctNovDec235689987522
Data source: Forks 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 Forks

In Forks, United States, September ushers in a notable transition in sunshine hours, boasting a generous 240 hours of bright days. This marks a gradual decline from the peak of 339 hours seen in July and sturdy 312 hours in August, as the summer warmth begins to yield to the cooler embrace of autumn. However, September still maintains a robust amount of sunlight compared to the earlier months of the year, where January's meager 76 hours felt starkly different. As the year progresses, a downward trend in daylight becomes evident, with October dipping to 187 hours and continuing into the shorter days of winter. Thus, September not only stands out as the last hurrah of substantial sunshine before the gray months arrive but also reflects the gradual yet predictable rhythm of seasonal change.

Monthly Sunshine Duration in Forks: September Highlighted

The September sunshine duration represents the total number of hours Forks 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.
JanFebMarAprMayJunJulAugSepOctNovDec76h134h206h227h299h319h339h312h240h187h117h98h
Data source: Forks September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Forks During September

In September, Forks, United States, experiences a 27% chance of sunny weather, which reflects a notable decline from the peak of 45% in April. The summer months of June, July, and August show a modest consistency with 31% chances of sunshine, suggesting that the weather remains somewhat temperate as fall approaches. Although September's likelihood of sun is slightly lower than the summer months, it still stands above the dismal percentages seen in the winter months, where chances plummet to a mere 14% in November. Overall, while September may not bring the sunniest skies, it still offers a fighting chance for those seeking brighter days before winter's arrival.

Percentage of Sunny Days in September in Forks

The chart illustrates the percentage of sunny days in Forks 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 Forks experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec17%22%28%45%26%38%31%31%27%25%14%19%
Data source: Forks September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Forks in September

As the summer warmth begins to fade, September in Forks, United States sees a delightful transition in daylight duration, bringing about 12 hours of sunlight to the region. This month represents a notable shift from the sun-drenched days of July and August, which boast 15 hours of daylight. As autumn approaches, the days gradually shorten, with September serving as a buffer between the vibrant summer months and the brisk fall season. Following this trend, the daylight hours will continue to decrease, ultimately settling at 10 hours in October. This cyclical pattern not only highlights the changing seasons but also sets the stage for the cultivation of cozy indoor activities as evenings grow longer and nights become cooler.

Average Daylight Hours in Forks for September

The chart illustrates the variation in daylight duration in Forks throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 52m10h 15m11h 57m13h 41m15h 11m15h 57m15h 31m14h 10m12h 30m10h 46m9h 13m8h 26m
Data source: Forks daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Forks

As summer wanes and September arrives in Forks, the wind begins to pick up speed slightly, averaging 3.5 m/s (8 mph), marking a notable shift from the quieter breezes of the previous months. This increase indicates a gentle transition toward autumn, making way for the more robust winds expected in October and November. While July and August experience their calmest periods, September serves as a bridge, hinting at the return of more vigorous gusts in the coming months. This gradual change in wind patterns not only enhances the atmospheric feel of the region but also foreshadows the invigorating breezes that will accompany the fall foliage, inviting both locals and visitors to enjoy the crisp air and scenic beauty.

Average September Wind Speed in Forks

The chart displays monthly wind speed patterns in Forks, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.85.04.43.03.23.12.72.83.5 m/s4.65.34.9
Data source: Forks September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Forks Compares to Other Months

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

In September, temperatures in Forks typically range from a minimum of 6°C (43°F) to a maximum of 27°C (82°F), with an average of 14°C (58°F). The month sees a significant amount of precipitation, totaling 131 mm (5.1 in) over about 11 rainy days, while humidity levels are relatively comfortable at 74%. In contrast, January brings colder temperatures, with a minimum of -2°C (28°F) and a maximum of 14°C (57°F), resulting in an average of 6°C (44°F). The winter month is notably wetter, with precipitation reaching 281 mm (11.1 in) spread over 18 rainy days and higher humidity at 86%. For more detailed information on January weather in Forks, check out Forks weather in January.

In September, the weather tends to be milder, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 27°C (82°F), averaging around 14°C (58°F). This month sees moderate rainfall, accumulating to 131 mm (5.1 in) over approximately 11 days, with a humidity level of 74%. In contrast, February experiences cooler conditions, with temperatures dipping as low as -3°C (28°F) and peaking at 13°C (55°F), averaging only 5°C (41°F). Precipitation is higher in February, totaling 189 mm (7.5 in) across 18 days, and humidity also rises to 84%. For more detailed information, check out Forks weather in February.

When comparing the weather in September and March, we see a noticeable difference in temperature and precipitation patterns. September typically enjoys milder temperatures, with averages around 14°C (58°F) and highs reaching up to 27°C (82°F), while March is cooler, averaging just 7°C (44°F) with maximums of 20°C (69°F). However, March is generally wetter, with 181 mm (7.1 in) of precipitation over 18 days, compared to September's 131 mm (5.1 in) across 11 days. Additionally, March has higher humidity at 85%, compared to September's 74%, creating a distinctly different climatic feel. For a more detailed look at March weather, check out Forks weather in March.

When comparing the weather in September and April, we observe notable differences in temperature and precipitation. September tends to be warmer, with average temperatures hovering around 14°C (58°F) and daytime highs reaching up to 27°C (82°F). In contrast, April is cooler, with an average of 9°C (48°F) and maximum temperatures peaking at 22°C (72°F). Precipitation is more frequent in April, occurring over 16 days and totaling 153 mm (6.0 in), compared to September, which sees 131 mm (5.1 in) over 11 days. Additionally, April has slightly higher humidity at 83% versus September's 74%. For more detailed insights about the weather in April, you can visit Forks weather in April.

September and May present quite distinct weather patterns. September sees a broader temperature range, with minimums of 6°C (43°F) and maximums reaching 27°C (82°F), averaging 14°C (58°F). In contrast, May has slightly cooler temperatures with a minimum of 4°C (40°F) and a maximum of 24°C (76°F), averaging at 11°C (52°F). Precipitation is more significant in September, at 131 mm (5.1 in) over 11 days, compared to May's lighter rainfall of 68 mm (2.7 in) across 9 days. Humidity levels also differ, with September at 74% and May slightly higher at 84%. For a detailed look at the weather conditions in May, visit Forks weather in May.

In September, the weather in Forks sees an average temperature of 14°C (58°F), with minimums dipping to 6°C (43°F) and maximums reaching 27°C (82°F). This month experiences more precipitation, totaling 131 mm (5.1 in) over about 11 days. The humidity remains relatively high at 74%. In contrast, June brings slightly cooler average temperatures of 13°C (56°F) and higher maximums, peaking at 34°C (93°F). This month has considerably less rainfall, with only 61 mm (2.4 in) recorded over 10 days, though the humidity is a bit higher at 84%. For more details, check out Forks weather in June.

In comparing the weather between September and July, September tends to be slightly cooler with a minimum temperature of 6°C (43°F) compared to July's minimum of 9°C (48°F). Both months share an average temperature of 14°C (58°F), but September experiences warmer maximum temperatures reaching up to 27°C (82°F), whereas July peaks at 24°C (76°F). Additionally, September is significantly wetter, with 131 mm (5.1 in) of precipitation over 11 days, while July has only 23 mm (0.9 in) over just 5 days. Lastly, humidity is a bit lower in September at 74% compared to July's 82%. For a closer look at July weather, you can visit Forks weather in July.

September's weather presents a notable shift from August, characterized by cooler temperatures and increased precipitation. While August boasts a higher average maximum temperature of 30°C (86°F) and fewer rainy days, with just 25 mm (1.0 in) of precipitation over 4 days, September experiences a broader temperature range, with maximums reaching up to 27°C (82°F) and a drop in the minimum temperature to 6°C (43°F). Additionally, September sees significantly more rain, totaling 131 mm (5.1 in) across 11 days, which contributes to a slightly elevated humidity level of 74%. For a more detailed look at the weather specifics for August, check out Forks weather in August.

September and October showcase a distinct transition in weather patterns. September tends to be milder, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 27°C (82°F), while October sees cooler averages between 3°C (37°F) and 19°C (67°F). Additionally, October experiences increased precipitation, totaling 219 mm (8.6 in) over 15 days compared to September's 131 mm (5.1 in) over 11 days, and the humidity rises from 74% to 83%. This indicates a shift to a wetter and cooler climate as autumn takes hold. For more detailed insights, you can check out Forks weather in October.

September and November present contrasting weather patterns, reflecting the transition from late summer to late autumn. In September, temperatures are milder, with a minimum of 6°C (43°F) and a maximum of 27°C (82°F), averaging around 14°C (58°F). However, it is not without its share of rain, receiving 131 mm (5.1 in) over 11 days and maintaining a humidity level of 74%.

In stark contrast, November experiences significantly cooler temperatures, with a minimum of just 1°C (33°F) and a maximum of 16°C (60°F), resulting in an average temperature of only 8°C (47°F). The month is much wetter as well, with total precipitation soaring to 336 mm (13.2 in) over 19 days, and humidity levels rising to 86%. For more detailed insights, check out the Forks weather in November.

September and December weather present a stark contrast in both temperature and precipitation. In September, temperatures range from a mild 6°C (43°F) at night to a warm 27°C (82°F) during the day, while average humidity stands at 74%. The month sees a total precipitation of 131 mm (5.1 in) over 11 days, making it relatively drier. In contrast, December brings much cooler conditions with temperatures dipping as low as -4°C (24°F) and peaking at just 13°C (56°F). This month experiences significantly higher precipitation, totaling 293 mm (11.5 in) over 20 days and a spike in humidity to 87%. For more detailed insights into the December weather, check out Forks weather in December.

Compare Forks's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Forks

As summer fades into fall, September in Forks brings a distinct transition in weather. With an average temperature that hovers around a comfortable 14°C (58°F), it’s cooler than the summer months, yet still warm enough to enjoy outdoor activities. However, this month is not without its share of rain, as 131 mm of precipitation falls over about 11 days, making it one of the wetter months of the year. Humidity levels also rise, contributing to a refreshing, crisp atmosphere that heralds the approach of autumn. For those curious about what to expect throughout the year, including September's unique climate features, you can explore more at Forks Climate.