Last updated: February 24, 2025
In September, Cascade Locks, United States experiences a dynamic weather pattern characterized by warm temperatures peaking at a maximum of 35°C (96°F) while averaging a comfortable 15°C (60°F). The nights can be quite cool, with temperatures dipping to a minimum of 3°C (37°F). This month sees a total precipitation of 103 mm (4.0 in), distributed over 9 days, contributing to an overall humidity of 59%. Visitors should prepare for a mix of sunny days and occasional rainfall, making it a beautifully varied time to explore the scenic landscapes that Cascade Locks offers.
In September, Cascade Locks experiences a delightful transition into autumn, marked by temperatures that reflect both lingering summer warmth and the onset of cooler days. With minimums around 3°C (37°F) and average highs reaching up to 35°C (96°F), the weather remains pleasantly warm, ideal for outdoor activities. This month typically balances comfortable, mild afternoons with crisper evenings, showcasing the beautiful shift in nature's palette as trees begin to don their fall colors. The overall trend of gradually decreasing temperatures from the scorching highs of summer fosters a refreshing atmosphere, making September a perfect time to explore the scenic landscapes of this charming area.
In September, Cascade Locks experiences a noticeable increase in precipitation, recording 103 mm (4.0 in) over 9 days, marking a shift from the dry summer months. This uptick is part of a seasonal trend as the region transitions from the arid conditions of July and August, where only a mere 9 mm (0.4 in) and 13 mm (0.5 in) fell, respectively. As autumn approaches, precipitation levels start to climb, signaling the return of wetter weather in anticipation of the heavier rains of October, which typically averages 201 mm (7.9 in). This pattern illustrates the shift from the dry, warm months to a more robust rain season, a hallmark of the Pacific Northwest climate.
In September, Cascade Locks experiences a notable shift in humidity, exhibiting a decline to 59%, the lowest level of the year. Following a summer peak in August at 62%, this drop illustrates the transition into the fall season. The trend indicates a steady decrease from the higher humidity levels typical in winter months, with values reaching as high as 88% in November and December. This seasonal pattern highlights the region's relatively dry September, making it a pleasant time to enjoy the outdoors as the crisp air begins to set in, contrasting sharply with the dampness of the preceding and following months.
In September, Cascade Locks experiences a UV Index of 8, placing it in the very high exposure category with a burn time of just 15 minutes. This marks a slight decline from the peak summer months of June and July, where the UV Index reached its maximum of 10. As summer fades, the UV Index begins to decrease, but it remains significantly elevated, reminding residents and visitors alike to take sun protection seriously. With the warm season still lingering, outdoor enthusiasts should be especially vigilant during this month. For more detailed insights, visit Cascade Locks UV Index.
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As summer gracefully transitions into autumn, September in Cascade Locks enjoys a delightful 279 hours of sunshine, marking a significant drop from the sun-drenched July peak of 401 hours. This month continues to bask in vibrant sunlight, though it signals the return of shorter days as October approaches, bringing with it 223 hours of sun. The trend throughout the year showcases a delightful crescendo from the chilly depths of winter, where January only sees 95 hours of sunshine, escalating steadily to the high point of early summer. With September’s golden warmth acting as a bridge, it beautifully captures the lingering essence of summer while gently ushering in the autumn colors. Visitors can revel in this tranquil period, perfect for outdoor adventures against a backdrop of shifting leaves under the embracing sunshine.
In Cascade Locks, September marks a transition into the tail end of summer, where the likelihood of sunny weather remains promising at 48%. This figure showcases a notable dip from the peak sunny days of July and August, which boast 73% and 55% respectively, yet it still offers more sunshine than the autumn months that follow. The data reflects a gradual decrease in sunny probabilities as the year progresses, but September maintains a healthy balance, offering a pleasant blend of warm days and a hint of fall's arrival. With such a moderate chance of sun, it's an ideal time to enjoy the scenic beauty of the area before the rainy season sets in.
As summer wanes in Cascade Locks, September brings a noticeable shift in daylight, with the sun gracing the skies for 12 hours each day. This is a gentle decline from the robust 14 hours enjoyed in August, highlighting the transition towards autumn. As the days grow shorter, it's a time to relish the lingering warmth of late summer while preparing for the cozy embrace of fall. The daylight hours will continue to decrease steadily, dropping to 10 hours by October, signaling that nature is gearing up for its seasonal changes. This rhythm of light reflects the gradual shift in the landscape, inviting residents and visitors alike to bask in the glorious hues of early autumn.
In Cascade Locks, the September wind dances softly, with an average speed of 2.1 m/s (5 mph), marking a slight dip from the summer months. This gentle breeze is characteristic of the region, where wind speeds remain relatively stable throughout the year, fluctuating between 2.1 and 3.0 m/s. As autumn approaches, the winds subtly shift but maintain a consistent lightness, making September a serene time to experience the scenic beauty of Cascade Locks. Interestingly, this month follows a summer period where the winds were ever so slightly more robust, painting a picturesque transition into the cooler season ahead.
The weather in Cascade Locks 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 Cascade Locks and find detailed weather information for every month.
September and January exhibit starkly contrasting weather patterns. In September, temperatures range from a mild minimum of 3°C (37°F) to a hot maximum of 35°C (96°F), with an average of 15°C (60°F). The month sees about 103 mm (4.0 in) of precipitation over 9 days and features a comfortable humidity level of 59%. In contrast, January is much colder, with temperatures dropping significantly, ranging from a frigid minimum of -16°C (4°F) to a maximum of 12°C (54°F) and averaging just 2°C (36°F). This winter month experiences heavier rainfall, totaling 275 mm (10.8 in) across 18 days, accompanied by higher humidity at 86%. For more detailed information, check out Cascade Locks weather in January.
September and February present stark contrasts in weather. September experiences a broader temperature range, with minimums of 3°C (37°F), averages of 15°C (60°F), and maximums soaring to 35°C (96°F), accompanied by moderate humidity at 59%. In contrast, February brings colder conditions, featuring minimums plunging to -17°C (1°F) and an average of just 2°C (35°F), with highs reaching only up to 14°C (58°F). Additionally, February sees significantly higher precipitation at 301 mm (11.8 in) over 21 days, compared to September's 103 mm (4.0 in) across only 9 days. For more details on February weather conditions, you can visit Cascade Locks weather in February.
September and March present contrasting weather patterns that reflect the transition between summer and spring. In September, temperatures range from a mild 3°C (37°F) at night to a warm 35°C (96°F) during the day, with an average of 15°C (60°F). This month sees 103 mm (4.0 in) of precipitation spread over 9 days and a humidity level of 59%.
In contrast, March experiences much cooler temperatures, with lows plunging to -9°C (16°F) and highs reaching 20°C (68°F), averaging around 4°C (40°F). Additionally, precipitation is notably higher in March at 194 mm (7.6 in) over 18 days, contributing to a higher humidity level of 86%. For further details on the weather specifics, you can visit Cascade Locks weather in March.
When comparing the weather in September and April, it’s evident that both months present distinct climatic characteristics. In September, temperatures are generally warmer, with a minimum of 3°C (37°F) and an average of 15°C (60°F), peaking at 35°C (96°F). The month experiences less rainfall, totaling 103 mm (4.0 in) over about 9 days, with humidity levels around 59%. In contrast, April is cooler, featuring a minimum temperature of -4°C (26°F) and an average of 8°C (46°F), with a maximum of 26°C (79°F). This month is wetter, with 170 mm (6.7 in) of precipitation spread over 16 days and a higher humidity of 85%. For more specific information on the weather dynamics in April, you can visit Cascade Locks weather in April.
September weather typically features a broader temperature range than May, with minimums reaching down to 3°C (37°F), an average of 15°C (60°F), and maximums peaking at 35°C (96°F). In contrast, May sees more moderate temperatures, ranging from a minimum of 0°C (33°F) to a maximum of 30°C (86°F) and a lower average of 12°C (54°F). While September experiences slightly higher precipitation at 103 mm (4.0 in) over 9 days, May, with 86 mm (3.4 in) spread over 12 days, tends to be wetter in terms of rain frequency. Humidity also differs, with May being more humid at 80%, compared to September's 59%. For a detailed look at how May weather influences local conditions, check out Cascade Locks weather in May.
When comparing the weather in September and June, both months exhibit similar average temperatures, hovering around 15°C (60°F). However, September experiences a wider temperature range, with minimums dipping to 3°C (37°F) and maximums reaching 35°C (96°F), while June generally has slightly warmer conditions, with minimums at 4°C (40°F) and maximums soaring up to 42°C (108°F). Additionally, September sees higher precipitation at 103 mm (4.0 in) over 9 days, compared to June's 72 mm (2.8 in) over the same number of days, suggesting that September is relatively wetter. The humidity levels are also noticeably different, with June being more humid at 82%, compared to September's 59%. For more detailed insights on June weather in the area, you can check Cascade Locks weather in June.
In comparing September and July weather, September presents a broader temperature range with minimums around 3°C (37°F) and maximums peaking at 35°C (96°F), while July maintains slightly warmer temperatures, with minimums at 6°C (42°F) and maximums reaching 37°C (98°F). The average temperature in September is 15°C (60°F), compared to July's 19°C (66°F). Additionally, September is significantly wetter, receiving 103 mm (4.0 in) of precipitation over 9 days, in contrast to July's minimal 9 mm (0.4 in) over just 3 days. Humidity levels are also higher in July at 78%, while September has a more moderate humidity of 59%. For a detailed look at weather patterns, check out Cascade Locks weather in July.
In comparing the weather of September and August, we see notable differences in temperature and precipitation patterns. September experiences a broader temperature range with a minimum of 3°C (37°F) and maximum of 35°C (96°F), while August has milder temperatures ranging from 6°C (43°F) to 38°C (101°F). August is generally warmer and drier, receiving only 13 mm (0.5 in) of precipitation over 4 days, compared to September's 103 mm (4.0 in) across 9 rainy days. Humidity levels remain relatively similar, with September at 59% and August slightly higher at 62%. For a more detailed look at conditions, you can check out Cascade Locks weather in August.
September experiences a broader temperature range with minimums of 3°C (37°F) and maximums reaching up to 35°C (96°F), while the average temperature sits at a comfortable 15°C (60°F). However, October ushers in cooler conditions with minimum temperatures dropping to -5°C (24°F) and an average temperature of 9°C (48°F). Additionally, October sees increased precipitation, with 201 mm (7.9 in) expected over 14 days compared to September's 103 mm (4.0 in) over 9 days. The humidity also rises significantly in October, reaching 78%, compared to September's 59%. For more details on the October climate, visit Cascade Locks weather in October.
September and November present quite contrasting weather patterns. In September, temperatures range from a mild 3°C (37°F) at night to a warm 35°C (96°F) during the day, with an average of 15°C (60°F). The month sees 103 mm (4.0 in) of rain across 9 days and a moderate humidity level of 59%. In contrast, November brings significantly cooler temperatures, with a minimum of -4°C (25°F), an average of 5°C (41°F), and a maximum of 17°C (62°F). Rainfall increases dramatically to 265 mm (10.4 in) over 19 days, accompanied by higher humidity levels at 88%. For more insights on what to expect, check out the details at Cascade Locks weather in November.
In September, temperatures in Cascade Locks range from a cool minimum of 3°C (37°F) to a warm maximum of 35°C (96°F), with an average of 15°C (60°F). The month experiences relatively moderate precipitation of 103 mm (4.0 in) over just 9 days, and humidity levels sit at around 59%. Conversely, December brings a dramatic shift, with temperatures dropping significantly to a minimum of -12°C (11°F) and an average temperature of just 2°C (36°F). Precipitation also increases substantially, reaching 302 mm (11.9 in) across 21 days, accompanied by a higher humidity level of 88%. For more detailed information about December weather in this region, you can visit Cascade Locks weather in December.
As September rolls into Cascade Locks, the weather presents a delightful transition from the warmth of summer to the crispness of autumn. With temperatures peaking around 35°C (96°F), this month still holds onto the lingering warmth, yet the average and minimum temperatures hint at the cooler days to come. The humidity, sitting at a comfortable 59%, coupled with 103 mm of precipitation over 9 days, signifies the beginning of a wetter season while still allowing for plenty of enjoyable outdoor activities. As you explore the evolving landscape, you'll find September's blend of warmth and moisture sets the stage for stunning fall foliage. For a more in-depth look at weather patterns throughout the year, check out Cascade Locks Climate.