Last updated: February 24, 2025
In September, Signal Mountain, United States, experiences a warm climate, with a maximum temperature peaking at 37°C (98°F) and an average of 24°C (75°F). The weather shifts noticeably during the month, bringing a cooler low of 9°C (48°F) at night. Rainfall is prevalent, with 106 mm (4.2 in) recorded over 8 days, contributing to a relative humidity of 64%. This blend of warm days and cooler evenings, coupled with periodic rain, creates a dynamic and refreshing atmosphere for both residents and visitors.
In September, Signal Mountain experiences a delightful transition between the warmth of summer and the onset of autumn. The month features a minimum temperature of 9°C (48°F), a comfortable average of 24°C (75°F), and highs soaring to 37°C (98°F), reflecting lingering summer vibes. This gradual shift is evident as September's temperatures begin to cool slightly compared to the peak summer months, creating a perfect climate for outdoor activities. Vibrant foliage starts to emerge as the month progresses, painting the landscape with rich hues, making it a picturesque time for visitors who enjoy a blend of warmth and the beginnings of fall.
In September, Signal Mountain experiences a noticeable transition in its precipitation patterns, receiving 106 mm (4.2 in) of rain over 8 days. This level of precipitation is consistent with the wetter months preceding it, like August, which had a similar amount but over more days. Compared to the summer months, September marks a slight decrease in frequency, hinting at a shift towards the drier fall season. This trend of decreasing rainfall beautifully sets the stage for the drier months ahead, while still retaining enough moisture to sustain the lush landscapes characteristic of this region as it gradually moves into the cooler autumn months.
September in Signal Mountain marks a significant shift in humidity levels, with the average dropping to 64%—the lowest point of the year. This decline continues the trend observed from the summer months, where humidity steadily decreased from 67% in August. As the warm, sticky days of summer fade, September showcases a comfortable beginning to fall. Following this month, humidity levels gradually rise again in October, reflecting the seasonal transition that brings increased moisture. Overall, the data reveals a clear pattern of higher humidity early in the year, peaking during the winter and autumn months, while summer offers a refreshing break before the autumn humidity returns.
As September arrives in Signal Mountain, the UV Index remains notably high at 9, categorized as very high, with a burn time of approximately 15 minutes. This month marks a slight dip from the extreme levels seen in the peak summer months of June and July, but caution is still advised. The transition from August's UV Index of 10 indicates a gradual decrease as fall approaches, yet the potential for skin damage from sun exposure remains significant. As we move forward into October, the UV Index will continue to decline, entering a high category with an Index of 7. Staying informed about the UV Index is essential to protect yourself while enjoying the crisp fall outdoors. For more detailed information on UV exposure trends, visit Signal Mountain UV Index.
UV Risk Categories
In September, Signal Mountain basks in a welcoming transition towards autumn, receiving 276 hours of sunshine. This month continues the trend set by the peak of summer, with sunlight dipping slightly from July's impressive 317 hours and August's 305 hours. The consistent sunshine throughout the summer months fuels a vibrant landscape, paving the way for the stunning fall foliage to emerge. As daylight begins to wane, the cooler evenings invite residents and visitors alike to relish the last golden rays of summer, making September a picturesque moment in the annual cycle.
In September, Signal Mountain enjoys a notable increase in sunny days, with a 49% chance of sunshine, making it one of the more favorable months for outdoor activities. This uptick follows a trend of fluctuating sun chances throughout the year, where the spring months display a gradual rise, culminating in the summer, which tends to be less sunny overall. Interestingly, September's sunshine likelihood stands out above the preceding summer months of June, July, and August, suggesting a refreshing transition into fall. As the year progresses, the likelihood of sun peaks again in November at 57%, offering residents and visitors alike a tantalizing glimpse of sunny, autumnal days ahead.
As the summer heat fades in September, Signal Mountain experiences a gradual shift in daylight duration, with 12 hours of sunlight marking a transition into autumn. Following the peak of summer's abundant light—when daylight reached an impressive 14 hours in June and July—the days begin to shorten, echoing the subtle changes in nature all around. This month serves as a bridge, where daylight decreases from 13 hours in August, highlighting the cyclical rhythm of the seasons. As we approach October with only 11 hours of light, the slight dimming in September offers a gentle reminder of the impending cozy fall evenings.
As summer fades into autumn, September in Signal Mountain greets us with a slight uptick in wind speed from the lethargic summer months, averaging 1.8 m/s (4 mph). This marks a subtle return to the breezier conditions seen in the spring, revealing a gentle transition as nature prepares for the cooler seasons ahead. While September's winds are milder compared to the spring gusts that peak in March at 2.8 m/s (6 mph), they signify the shift from the stagnant calm of July and August, which recorded their lowest speeds of 1.8 m/s (4 mph) and 1.6 m/s (4 mph), respectively. Overall, September serves as a reminder of nature's rhythms, hinting at the fresh breezes yet to come in October, as the average wind speed begins to climb once more.
The weather in Signal Mountain 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 Signal Mountain and find detailed weather information for every month.
In September, weather conditions are typically warm, with average temperatures around 24°C (75°F) and daytime highs reaching up to 37°C (98°F). The month experiences some precipitation, averaging 106 mm (4.2 in) over 8 days, and generally maintains a humidity level of 64%. In stark contrast, January brings a significant drop in temperatures, with averages plunging to 6°C (43°F) and nighttime lows dipping to as low as -13°C (9°F). While January also has notable precipitation, totaling 99 mm (3.9 in) over 10 days, the humidity is higher at 87%. The differences in weather are quite pronounced, highlighting the seasonal transition between these two months. For more specific details about January weather in the region, you can check Signal Mountain weather in January.
September and February present stark contrasts in weather conditions. In September, temperatures range from a mild 9°C (48°F) to a scorching 37°C (98°F), with an average of 24°C (75°F). The month sees about 106 mm (4.2 in) of precipitation, falling over approximately 8 days and maintaining a humidity level of 64%. On the other hand, February experiences much cooler temperatures, with a minimum of -7°C (20°F), an average of 9°C (48°F), and a maximum of 26°C (79°F). This month is also wetter, receiving about 171 mm (6.7 in) of rainfall, spread over 14 days, and features higher humidity at 87%. For more detailed information, you can check out Signal Mountain weather in February.
September and March present contrasting weather patterns. In September, temperatures range from a pleasant minimum of 9°C (48°F) to a scorching maximum of 37°C (98°F), with an average of 24°C (75°F). The month sees 106 mm (4.2 in) of precipitation over 8 days, and humidity levels hover around 64%. In sharp contrast, March experiences much cooler temperatures, with a minimum of -6°C (22°F) and a maximum of 29°C (84°F), yielding an average of 12°C (54°F). This month is wetter, accumulating 169 mm (6.7 in) of rain across 13 days, along with higher humidity at 85%. For more detailed weather information, check out Signal Mountain weather in March.
In September, the weather tends to be warmer with average temperatures ranging from a chilly 9°C (48°F) at night to a high of 37°C (98°F) during the day, creating a more summer-like atmosphere. However, it also brings some rainfall, with a total precipitation of 106 mm (4.2 in) over about 8 days and a humidity level of 64%. In contrast, April experiences a cooler climate, with temperatures between -1°C (30°F) at night and a pleasant 30°C (87°F) during the day, averaging around 16°C (60°F). This month is characterized by even higher precipitation at 156 mm (6.2 in) spread over 10 days and a higher humidity of 82%. For more detailed insights on April weather, check out Signal Mountain weather in April.
In comparing the weather between September and May, we find notable differences in temperature and humidity levels. September typically experiences warmer temperatures, with a minimum of 9°C (48°F) and average highs reaching up to 37°C (98°F), whereas May has cooler minimums at 4°C (39°F) and average highs around 34°C (93°F). Additionally, September tends to be drier with 106 mm (4.2 in) of precipitation over 8 days, compared to May's 96 mm (3.8 in) spread across 10 days. Furthermore, humidity is higher in May at 83%, compared to September's 64%, creating a distinctly different feel to each month. For more specific details, you can check out Signal Mountain weather in May.
In comparing the weather between September and June, both months feature similar average temperatures, hovering around 24°C (75°F to 76°F). However, September tends to experience a wider range of temperatures, with minimums dropping to 9°C (48°F) and maximums reaching as high as 37°C (98°F). In contrast, June has a more moderate temperature range, with minimums at 11°C (51°F) and maximums capped at 34°C (94°F). Precipitation is slightly higher in June, with 120 mm (4.7 in) over 13 days compared to September’s 106 mm (4.2 in) across 8 days, contributing to a higher humidity level of 82% in June versus 64% in September. For a more detailed overview, you can check Signal Mountain weather in June.
When comparing the weather in September and July, we can see some notable differences. September experiences a wider range of temperatures, with a minimum of 9°C (48°F) and a maximum reaching 37°C (98°F), while the average temperature is slightly cooler at 24°C (75°F). In contrast, July has a milder minimum temperature of 16°C (61°F) and an average of 26°C (80°F), maintaining the same maximum of 37°C (98°F). Additionally, September sees less humidity at 64%, compared to July's higher humidity level of 78%. Precipitation is also notable, with both months recording the same total of 106 mm (4.2 in), but spread over fewer days in September (8 days) compared to July (14 days). For more details, check out Signal Mountain weather in July.
In comparing the weather from August to September, September experiences a more significant drop in minimum temperatures, with lows of 9°C (48°F) compared to August's minimum of 15°C (60°F). However, September's average temperature is slightly warmer at 24°C (75°F) than August's 26°C (78°F), while the maximum temperature in September can reach up to 37°C (98°F), slightly higher than August’s maximum of 35°C (96°F). Precipitation is also noteworthy; September has 106 mm (4.2 in) over 8 days, which is less than August's 121 mm (4.8 in) over 14 days. Humidity levels remain quite similar, with September at 64% and August at 67%. For more details on August weather, you can check Signal Mountain weather in August.
September and October present a contrasting transition in weather patterns. In September, temperatures experience a warm range, with a minimum of 9°C (48°F) and an average high of 37°C (98°F), accompanied by relatively moderate humidity at 64%. Precipitation is also notable, totaling 106 mm (4.2 inches) over 8 days. Meanwhile, October sees a significant drop in minimum temperatures, reaching as low as -2°C (29°F), while the average temperature settles at 18°C (65°F). The month brings slightly more rain, totaling 133 mm (5.2 inches) over 10 days, and a rise in humidity to 74%. For a more detailed overview, check Signal Mountain weather in October.
September and November present a stark contrast in weather patterns. In September, temperatures range from a mild minimum of 9°C (48°F) to a scorching maximum of 37°C (98°F), with an average of 24°C (75°F). This month experiences an average precipitation of 106 mm (4.2 in) over 8 days, accompanied by a moderate humidity level of 64%. In contrast, November brings cooler temperatures with a minimum of -6°C (21°F), an average of 10°C (50°F), and a maximum of 26°C (79°F). Precipitation decreases to 72 mm (2.8 in), still spread over 8 days, but humidity rises significantly to 87%. For more detailed insights on the weather during this month, you can visit Signal Mountain weather in November.
September and December present quite contrasting weather patterns. In September, temperatures range from a mild 9°C (48°F) at night to a scorching 37°C (98°F) during the day, with an average of 24°C (75°F). This month receives about 106 mm (4.2 in) of precipitation over roughly 8 days, accompanied by a humidity level of 64%. In stark contrast, December experiences much cooler weather, with minimum temperatures dropping to -8°C (18°F) and an average of 8°C (46°F), peaking at 23°C (73°F). Precipitation increases slightly to 139 mm (5.5 in) across 10 days, and humidity rises significantly to 88%. For more detailed information, you can check Signal Mountain weather in December.
In September, Signal Mountain transitions into a unique climate, marked by a pleasant average temperature that invites outdoor activities, as the heat of summer begins to wane. With a notable amount of rainfall, this month boasts more precipitation days than the preceding summer months, adding a refreshing touch to the landscape. As humidity levels sit at a comfortable 64%, the air feels mild, making it an ideal time for hiking and exploring the stunning surroundings. This blend of moderate temperatures and balanced moisture sets September apart from the scorching highs of July and the cooler, drier conditions that follow in October. For a deeper dive into the weather patterns that define this vibrant season, check out Signal Mountain Climate.