Last updated: February 24, 2025
Experience the vibrant September weather of Shasta Lake, United States, where temperatures soar to a maximum of 42°C (108°F), while an average temperature of 23°C (73°F) provides warm and pleasant conditions. With only 11 mm (0.4 in) of precipitation over just one day, the month is predominantly dry, allowing for ample opportunities to enjoy the stunning natural beauty. The humidity sits comfortably at 46%, adding to the overall pleasantness of early fall days. Whether you're planning outdoor adventures or simply relaxing by the lake, Shasta Lake's September climate offers delightful experiences for all.
September in Shasta Lake offers a seamless transition from the intense summer heat to the milder embrace of fall. With minimum temperatures around 6°C (43°F), the days begin to feel cooler compared to the sweltering highs often exceeding 42°C (108°F). The average temperature settles at a comfortable 23°C (73°F), providing a perfect backdrop for outdoor activities amidst the stunning autumn foliage. Although the peak warmth still lingers, indicating summer's refusal to fade entirely, September’s climate signals a gradual shift, making it an ideal time for visitors to enjoy both the beauty of lingering sunny days and the onset of a refreshing change in weather.
September marks a transition in Shasta Lake's precipitation patterns, recording 11 mm (0.4 in) over the course of just one day. This slight uptick follows the exceptionally dry summer months of July and August, which saw negligible rainfall, with only 1 mm (0.1 in) noted in August. The month of September serves as a gentle precursor to the wetter months ahead, as evidenced by the significant increases beginning in October, where precipitation jumps to 79 mm (3.1 in). The trend indicates that while September offers minimal rain, it sets the stage for the seasonal shift towards a more robust rainfall pattern as autumn approaches, contrasting sharply with the preceding arid summer months.
In September, Shasta Lake experiences a noticeable change in humidity, with levels rising to 46% after the drier summer months. This transition comes on the heels of August’s low of 42%, marking a gradual shift as the region prepares for the wetter fall season. As autumn approaches, humidity levels begin their ascent from July’s low of 56%, highlighting the natural ebb and flow of moisture that characterizes the area's climate. This uptick serves as a precursor to the significantly higher humidity levels typical in the coming months, as the landscape transitions from summer’s heat to the cooler, more humid conditions of October and November. Overall, September represents a bridge between the dry summer and the moist fall, encapsulating the dynamic nature of Shasta Lake's weather patterns.
As September arrives in Shasta Lake, the UV Index remains notably high at 9, categorizing the exposure as very high with a burn time of just 15 minutes. This marks a slight decrease from the peak summer months, where July and August also had a UV Index of 10, but still signifies a critical need for sun protection. The trend throughout the year shows a gradual increase in UV levels from 3 in January to the extremities of 11 during May and June, emphasizing the importance of vigilance as we transition into fall. As outdoor activities ramp up with the changing season, locals and visitors alike should remain aware of the solar intensity characteristic of the region. For detailed UV forecasts and safety tips, visit Shasta Lake UV Index.
UV Risk Categories
September in Shasta Lake, United States, welcomes a delightful 310 hours of sunshine, marking a gentle decline from the summer peak of 401 hours in July. As the days grow shorter, this month still retains a vibrant glow, reflecting the gradual transition into fall. August and September enjoy a similar warmth, with 352 hours and 310 hours respectively, suggesting that autumn in Shasta Lake brings an extended touch of summer. Following this bright period, October ushers in a notable drop to 275 hours, hinting at the cozy evenings ahead. Overall, September stands out as a bridge between the sun-soaked days of summer and the cooler embrace of fall, inviting outdoor enthusiasts to savor the remaining warmth before the seasonal shift fully takes hold.
In Shasta Lake, September continues the trend of increasing sunny weather as summer transitions to autumn. With a sunshine probability of 82%, it's a delightful month, ideal for outdoor activities and enjoying the natural beauty of the area. This figure reflects a slight dip from the peak sunshine in August, which boasts an impressive 91% chance of clarity. As the year progresses, sunny weather begins to decline in October, where the likelihood plummets to 49%, making September a prime time to relish the warm, sun-filled days before autumn settles in.
As summer gives way to autumn in Shasta Lake, September sees a transition in daylight duration, with an average of 12 hours of sunlight each day. This decline follows the peak days of 15 hours in June and the gradual tapering off through August's 13 hours. The shift marks a return to the shorter days of fall, reminding us of the cyclical nature of light throughout the year. By September's end, the daylight hours will continue to dwindle towards 11 hours in October, setting the stage for the cozy, indoor months ahead. This nuanced ebb and flow of daylight not only influences daily activities but also paints a vivid picture of the changing seasons in this serene locale.
As the summer winds begin to wane, September in Shasta Lake ushers in a gentle breeze, with an average wind speed of 2.2 m/s (5 mph), mirroring the conditions of the preceding months. Throughout the year, wind speeds remain relatively stable, ranging from 2.0 m/s (4 mph) in the peak of summer to a slight uptick of 2.5 m/s (6 mph) in May. This consistency not only enhances the region’s serene atmosphere but also marks a transition from the hot, calm days of summer to the crisp, invigorating air of autumn. As September rolls in, residents and visitors can enjoy the refreshing winds that accompany the change in seasons, signaling the approach of cooler days ahead.
The weather in Shasta Lake 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 Shasta Lake and find detailed weather information for every month.
September and January present contrasting weather patterns. In September, temperatures range from a balmy minimum of 6°C (43°F) to a scorching maximum of 42°C (108°F), with an average of 23°C (73°F). The month enjoys relatively low precipitation, averaging just 11 mm (0.4 in) over one rainy day, coupled with a moderate humidity of 46%. In stark contrast, January features much colder temperatures, with a minimum of -5°C (24°F) and an average of 7°C (45°F), peaking at a pleasant 21°C (69°F). January is significantly wetter, receiving around 257 mm (10.1 in) of rain across 13 days and exhibiting high humidity levels at 86%. For more detailed insights, check out Shasta Lake weather in January.
September and February present strikingly different weather patterns. September enjoys milder temperatures, with an average high of 23°C (73°F) and only minimal precipitation, averaging just 11 mm (0.4 in) over a single day. In contrast, February sees much colder temperatures, where the average high only reaches 8°C (47°F), with a significant drop at night to a minimum of -4°C (25°F). This month also brings considerable rainfall, totaling 229 mm (9.0 in) over about 10 days, resulting in much higher humidity at 87%. For more detailed insights, you can refer to Shasta Lake weather in February.
When comparing the weather in September and March, it’s clear that these months present vastly different climates. September enjoys warm days with an average temperature of 23°C (73°F) and can reach highs of up to 42°C (108°F), while experiencing relatively low precipitation of just 11 mm (0.4 in) over only one day. In contrast, March is much cooler with an average temperature of 10°C (50°F) and lows dipping to -2°C (29°F). This month is also characterized by significantly higher precipitation, totaling 217 mm (8.6 in) across 14 days, and a much more humid atmosphere with humidity levels around 86%. For a detailed look at the weather patterns in March, you can check out Shasta Lake weather in March.
When comparing the weather in September and April, notable differences emerge. September typically boasts a warm average temperature of 23°C (73°F), with maximums reaching up to 42°C (108°F), while April's average is considerably cooler at 14°C (58°F) and peaks at 32°C (90°F). Precipitation levels also contrast sharply, with September receiving only 11 mm (0.4 in) of rain over just 1 day, in stark contrast to April's 116 mm (4.6 in) spread over 9 days. Additionally, April's humidity is significantly higher at 83%, compared to September's 46%. For more detailed insights on April weather, you can visit Shasta Lake weather in April.
When comparing the weather in September and May, there are notable differences in temperature and precipitation. September tends to be warmer, with average temperatures reaching 23°C (73°F) and maximums soaring up to 42°C (108°F). In contrast, May has cooler average temperatures of 19°C (66°F) and maximums around 37°C (100°F). Additionally, May is significantly wetter, receiving 68 mm (2.7 in) of precipitation over about five days, while September is much drier, with only 11 mm (0.4 in) and just one rainy day. The humidity levels also reflect these seasonal shifts, with September at 46% and May at a higher 72%. For a closer look at May’s weather patterns, check out Shasta Lake weather in May.
In comparing the weather between September and June, we see a few notable differences. September experiences slightly cooler average temperatures, with a minimum of 6°C (43°F) compared to June's 7°C (45°F), and an average of 23°C (73°F) as opposed to June's warmer 25°C (76°F). Both months share the same maximum temperature of 42°C (108°F), reflecting a peak summer warmth. Precipitation levels are very similar, with September recording 11 mm (0.4 in) and June at 10 mm (0.4 in), both only experiencing one day of rainfall. Notably, June has higher humidity at 67%, compared to September’s 46%, contributing to a more muggy feel in early summer. For more detailed insights, you can explore Shasta Lake weather in June.
In comparing the weather between July and September, it is evident that July tends to be warmer on average, with temperatures ranging from a minimum of 14°C (58°F) to an average of 29°C (84°F) and reaching a maximum of 43°C (110°F). In contrast, September offers a wider range with a minimum temperature of 6°C (43°F) and an average of 23°C (73°F), peaking at 42°C (108°F). Additionally, September sees some precipitation with 11 mm (0.4 in) over just one day, while July experiences entirely dry conditions with no recorded precipitation. Moreover, July has higher humidity levels at 56%, compared to September's 46%. For more specific details on July weather, you can refer to Shasta Lake weather in July.
In comparing the weather between September and August, September experiences a more significant temperature range, with minimums dropping to 6°C (43°F) compared to August's milder minimum of 13°C (56°F). While the average temperature in August is warmer at 27°C (81°F) versus September's 23°C (73°F), both months can reach similar maximum highs, peaking at 42°C (108°F) and 43°C (110°F), respectively. Additionally, September sees slightly more precipitation with 11 mm (0.4 in) over one day, while August remains dry with just 1 mm (0.1 in) across the entire month. Despite the change in temperature, humidity remains relatively low, with September at 46% and August at 42%. For more detailed information on August weather, you can check Shasta Lake weather in August.
In September, the weather is characterized by warmer temperatures, with averages reaching up to 23°C (73°F) and maximums peaking at 42°C (108°F). The month sees limited rainfall, with only 11 mm (0.4 in) of precipitation over just one day, and a relatively comfortable humidity level of 46%. In contrast, October brings a noticeable drop in temperatures, with an average of 16°C (62°F) and maximums of 38°C (101°F). Additionally, October experiences significantly more rainfall, totaling 79 mm (3.1 in) over four days, and higher humidity levels at 67%. For more details about October's weather, check Shasta Lake weather in October.
In September, the weather is characterized by warm temperatures, with averages around 23°C (73°F) and a maximum that can reach up to 42°C (108°F). The month sees minimal rainfall, with only 11 mm (0.4 in) of precipitation spread over just one day, resulting in a relatively low humidity of 46%. In stark contrast, November brings much cooler temperatures, with an average of 11°C (52°F) and nighttime lows plunging to -2°C (30°F). This month is significantly wetter, experiencing 152 mm (6.0 in) of precipitation over eight days, leading to high humidity levels of 86%. For more detailed information, you can check Shasta Lake weather in November.
The contrast between September and December weather is striking. In September, temperatures range from a low of 6°C (43°F) to a scorching maximum of 42°C (108°F), with an average of 23°C (73°F) and very little precipitation, just 11 mm (0.4 in) over one day. The humidity remains relatively low at 46%. In comparison, December experiences much cooler temperatures, with a minimum of -4°C (26°F), an average of 7°C (45°F), and a maximum of 22°C (72°F). The month is significantly wetter, with 177 mm (7.0 in) of precipitation over 12 days, contributing to a much higher humidity level of 86%. For more detailed insights, visit Shasta Lake weather in December.
As summer transitions into fall, September brings a notable shift in weather at Shasta Lake. The temperatures remain warm, yet moderate compared to the peak summer months, as the heat of August gives way to cooler nights. With only a hint of rainfall and a single day of precipitation, the air feels relatively dry with a balanced humidity of 46%. This creates a pleasant ambiance for outdoor activities, making September an ideal time to experience the lake's picturesque surroundings. For a more detailed overview of seasonal changes, visit Shasta Lake Climate.