Last updated: February 24, 2025
Experience the diverse weather of Mount Shasta in September, where temperatures can range dramatically from a maximum of 36°C (96°F) to a minimum of -1°C (30°F), with an average of 17°C (63°F). The month sees a moderate precipitation amount of 23 mm (0.9 in), spread over just 4 days, making the air noticeably dry with an average humidity of 46%. This unique blend of warmth and occasional rain offers visitors a chance to enjoy outdoor activities amid stunning natural beauty.
In September, Mount Shasta experiences a notable transition as summer's warmth begins to wane. With minimum temperatures dropping to -1°C (30°F), the crispness of early autumn starts to settle in, yet the average climbs to a pleasant 17°C (63°F), and the maximum can soar to a toasty 36°C (96°F). This month showcases a blend of summer's lingering heat and the advent of cooler days, reflecting a dynamic climate that resonates with outdoor enthusiasts. As the days shorten and the nights cool down, visitors can enjoy both warm afternoons and brisk evenings, making September an ideal time for hiking and exploring the stunning natural beauty of the area.
In September, Mount Shasta experiences a notable shift in precipitation patterns, with 23 mm (0.9 in) recorded over just 4 days. This represents a slight increase from the arid summer months of July and August, which saw only 5 mm (0.2 in) and 9 mm (0.4 in), respectively. As the region transitions into autumn, September's rainfall serves as a precursor to the wetter months that follow, with October expecting a significant rise to 76 mm (3.0 in). This upward trend indicates a gradual reawakening of the landscape, setting the stage for more consistent precipitation as temperatures cool and the seasonal shifts take hold.
As the summer heat wanes and September arrives in Mount Shasta, the humidity begins to creep up, resting at a moderate 46%. This marks a subtle shift from the notably dry conditions of August, which dipped to a mere 42%. The transition reflects the gradual increase in moisture as the region prepares for the autumn months. Compared to earlier in the year, September's humidity is relatively low, yet it signals the approach of a wetter season ahead, as the percentages climb sharply back to 67% by October. This pattern highlights the area's distinct seasonal fluctuations, where summer dryness gives way to the refreshing embrace of fall.
As September unfolds in Mount Shasta, the UV Index remains notably high at 9, classifying it within the very high exposure category. This trend aligns with the months leading up to it, where the UV levels peaked during the summer months, specifically in May and June with an extreme reading of 11 and 12. Despite a slight reduction in intensity, the burn time of just 15 minutes still signals a need for sun protection. As the days gradually shorten and temperatures begin to cool, it’s crucial for outdoor enthusiasts to remain vigilant against UV exposure. For more detailed information, check out Mount Shasta UV Index.
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As September arrives in Mount Shasta, the summer sunshine begins to wane, yet it still provides a respectable 309 hours of daylight, a delightful transition from the sun-drenched months of July and August. This is part of a broader trend where the region basks in an impressive crescendo of sunlight from winter's mere 111 hours in January to a peak of 402 hours in July. The days gradually shorten as autumn takes hold, but September holds onto the warmth, outshining October’s 274 hours. It’s a perfect time to soak in the lingering rays before the higher peaks usher in the chill of fall, making for a beautiful backdrop against the turning leaves.
In September, Mount Shasta enjoys a 78% chance of sunny weather, showcasing a notable trend in the transition from summer to fall. Following the high peaks of July and August, where sunshine reigns supreme with probabilities soaring above 80%, September still boasts a robust level of sunshine, albeit with a slight dip. As the days begin to shorten and the crispness of autumn starts to creep in, the likelihood of clear skies remains favorable, making it an ideal time for outdoor adventures against the stunning backdrop of this majestic mountain. While the weather begins to cool, September still holds onto the warmth of summer, promising plenty of sunny days for both locals and visitors alike.
As September arrives in Mount Shasta, daylight begins to wane, offering approximately 12 hours of sunshine—a subtle shift from the vibrant summer months. After enjoying the long, bright days of June and July, which peak at 15 hours, the gradual decrease becomes evident. August still holds on to 13 hours of daylight, but by the time September rolls around, the early signs of autumn are unmistakable. This decline will continue into October, dropping to 11 hours, as the region transitions from the warmth of summer to the cooler embrace of fall. The rhythmic pattern of daylight in Mount Shasta elegantly reflects the changing seasons, inviting residents and visitors alike to savor the longer days of summer before the evenings begin to draw in.
As September rolls in, Mount Shasta experiences a gentle shift in wind patterns, with average speeds dipping slightly to 2.0 m/s (4 mph). This reflects a broader trend of lower winds during the summer months, particularly in July and August, where speeds reached their annual low of 1.9 m/s (4 mph). Interestingly, the months surrounding September exhibit a relatively stable range of wind speeds, typically hovering around 2.1 to 2.4 m/s (5 mph) from January through May. This transitional period hints at the onset of autumn, where the gentle breeze brings a refreshing change to the mountain's scenic landscape, inviting outdoor enthusiasts to bask in the beauty of nature as it prepares for the cooler months ahead.
The weather in Mount Shasta 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 Mount Shasta and find detailed weather information for every month.
September and January present distinctly different weather patterns. In September, temperatures range from a cool -1°C (30°F) at night to a warm 36°C (96°F) during the day, with an average of 17°C (63°F). The month sees relatively low precipitation, averaging only 23 mm (0.9 in) over about four days, coupled with a humidity level of 46%. In stark contrast, January is much colder, with temperatures dropping to a minimum of -19°C (-3°F) and peaking at just 14°C (58°F), averaging around 1°C (35°F). This month experiences significantly higher precipitation, totaling 227 mm (8.9 in) across approximately 13 days, and a much higher humidity level of 86%. For more details on January weather specifics, check out Mount Shasta weather in January.
September and February present contrasting weather patterns. In September, temperatures range from a chilly minimum of -1°C (30°F) to a warm maximum of 36°C (96°F), with an average of 17°C (63°F). The month sees moderate precipitation of 23 mm (0.9 in) over just 4 days, accompanied by relatively low humidity at 46%. In stark contrast, February has much colder temperatures, with a minimum of -13°C (8°F) and a maximum of 18°C (64°F), averaging only 2°C (36°F). This month is significantly wetter, receiving 218 mm (8.6 in) of rainfall over 11 days and experiencing high humidity levels at 87%. For more detailed insights, you can check Mount Shasta weather in February.
When comparing the weather in September and March, striking differences emerge. September boasts a significant temperature range, with minimums around -1°C (30°F) and maximums soaring up to 36°C (96°F), resulting in a pleasant average of 17°C (63°F). The month is relatively dry, registering only 23 mm (0.9 in) of precipitation over just 4 days and a humidity level of 46%.
In contrast, March experiences much colder temperatures, with lows reaching -15°C (6°F) and a modest average of 3°C (38°F). The month is notably wetter, receiving 204 mm (8.0 in) of rain across 16 days, contributing to a higher humidity level of 86%. Such differences are evident when examining the climate in various regions, including Mount Shasta weather in March.
When comparing the weather in September and April, notable differences emerge in both temperature and precipitation patterns. September enjoys a wider temperature range, with minimums around -1°C (30°F) and maximums reaching a scorching 36°C (96°F), making it a generally warmer month with an average of 17°C (63°F). In contrast, April sees cooler averages, with temperatures ranging from a minimum of -6°C (22°F) to a maximum of 25°C (77°F), resulting in a brisk average of 7°C (45°F). The stark difference in precipitation is also evident, as September has only 23 mm (0.9 in) over just 4 days, while April experiences significantly higher rainfall at 121 mm (4.8 in) across 10 days, contributing to much higher humidity levels at 83%. For more detailed insights, you can check the Mount Shasta weather in April.
In comparing the weather conditions of September and May, we see notable differences in temperature and precipitation patterns. September offers a wider temperature range, with minimums of -1°C (30°F) and maximums soaring up to 36°C (96°F), resulting in an average of 17°C (63°F). It features relatively low precipitation at 23 mm (0.9 in) over just 4 days, and a humidity level of 46%, making it feel quite warm during the day.
In contrast, May is cooler overall, with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 30°C (86°F), averaging 12°C (54°F). This month experiences significantly higher precipitation of 87 mm (3.4 in) across about 9 days, coupled with increased humidity at 72%. For more details on specific conditions, you can check out Mount Shasta weather in May.
In comparing the weather of September and June, both months exhibit a range of temperatures but with subtle differences. September boasts a minimum temperature of -1°C (30°F) and an average of 17°C (63°F), peaking at a maximum of 36°C (96°F), while June starts slightly higher with a minimum of 0°C (32°F) and an average of 18°C (64°F), reaching a maximum of 35°C (96°F). When it comes to precipitation, September experiences slightly less, with 23 mm (0.9 in) over 4 days, compared to June's 27 mm (1.1 in) also over 4 days. Furthermore, humidity levels are notably different, with September at 46% and June higher at 67%. For detailed insights into June weather, you can check Mount Shasta weather in June.
In September, temperatures can range from a chilly -1°C (30°F) at night to a warm 36°C (96°F) during the day, with an average of 17°C (63°F). This month experiences slightly more precipitation than July, with about 23 mm (0.9 in) falling over four days and lower humidity at 46%. In contrast, July boasts a milder minimum temperature of 8°C (47°F) and a higher average of 23°C (73°F), peaking at a sweltering 37°C (99°F). Additionally, July is characterized by minimal rainfall, totaling just 5 mm (0.2 in) over only one day, but it does have a higher humidity level of 56%. For detailed weather patterns, you can refer to Mount Shasta weather in July.
In comparing the weather between September and August, September experiences a broader temperature range, with nighttime lows dropping to around -1°C (30°F) and daytime highs reaching up to 36°C (96°F), resulting in an average temperature of 17°C (63°F). In contrast, August maintains a milder average of 22°C (71°F) with minimum temperatures starting at a more comfortable 7°C (44°F) and maximums peaking at 37°C (98°F). Additionally, September sees slightly higher precipitation, with 23 mm (0.9 in) over 4 days, compared to August's 9 mm (0.4 in) over just 2 days. Humidity levels are also marginally higher in September at 46%, compared to 42% in August. For a more detailed look at August conditions, you can check out Mount Shasta weather in August.
September typically experiences warmer temperatures, with a range from a low of -1°C (30°F) to a high of 36°C (96°F) and an average temperature of 17°C (63°F). The month sees relatively low precipitation, totaling 23 mm (0.9 in) over just 4 rainy days and moderate humidity levels at 46%.
In contrast, October brings cooler weather, with temperatures dropping to a minimum of -4°C (25°F) and a maximum of 31°C (87°F), leading to an average of 10°C (51°F). Additionally, October is wetter, with precipitation increasing significantly to 76 mm (3.0 in) spread over 5 days and higher humidity at 67%. For a detailed look at what to expect, check out Mount Shasta weather in October.
September and November present stark contrasts in weather patterns. In September, temperatures range from a minimum of -1°C (30°F) to a maximum of 36°C (96°F), with an average of 17°C (63°F), accompanied by relatively low precipitation of 23 mm (0.9 in) over just 4 days and humidity at 46%. In contrast, November brings significantly cooler temperatures, with a minimum of -14°C (7°F) and a maximum of 23°C (73°F), averaging around 5°C (42°F). Additionally, November experiences a substantial increase in precipitation, totaling 128 mm (5.1 in) across 9 days, with humidity rising to a much higher 86%. For more details on weather specifics in this month, check out Mount Shasta weather in November.
In comparing the weather of September and December, it’s clear that December brings significantly cooler temperatures and increased precipitation. September features a range of temperatures from a chilly minimum of -1°C (30°F) to a warm maximum of 36°C (96°F), with an average of 17°C (63°F) and relatively low humidity at 46%. In contrast, December sees much colder conditions, with minimum temperatures plummeting to -10°C (14°F) and an average of just 1°C (34°F). The maximum temperature in December reaches only 17°C (63°F), similar to September's average, while precipitation rises dramatically to 153 mm (6.0 in) over 12 days, indicating a much wetter month. For more information about winter conditions, check out Mount Shasta weather in December.
As summer melds into autumn, September weather in Mount Shasta showcases a remarkable transition. While the month can occasionally reach a sizzling maximum of 36°C (96°F), the average temperature hovers around a comfortable 17°C (63°F), providing a nice balance for outdoor activities. The crispness that sets in is nicely contrasted by cooler nights, often dipping to just below freezing. With only 23 mm of precipitation over four days, September is relatively dry compared to the wetter months that follow, allowing for plenty of sunny days to enjoy the changing foliage. For a more in-depth look at how September fits into the broader climate patterns, explore the details at Mount Shasta Climate.