September Weather in Deadwood, United States

Last updated: February 24, 2025

In September, Deadwood, United States, experiences a dynamic range of temperatures, with a maximum soaring to 37°C (100°F) and a cool minimum dipping to -3°C (27°F). The average temperature settles around a comfortable 16°C (61°F), making it a transitional month. Precipitation is moderate, totaling 43 mm (1.7 in) across 7 days, contributing to a notably humid atmosphere at 77%. This combination of heat and moisture sets the stage for a unique weather experience, showcasing the captivating shifts of early autumn in this historic town.

September Temperature in Deadwood

In September, temperatures in Deadwood, United States, mark a transitional shift as autumn approaches. With a minimum of -3°C (27°F), the month begins with a crispness in the air, while the average temperature hovers around a comfortable 16°C (61°F). Daytime highs can reach a warm 37°C (100°F), showcasing the lingering vestiges of summer. This blend of cooler nights and pleasantly warm days makes September a time of change, where the vibrant colors of fall begin to emerge against a backdrop of fluctuating temperatures. As the month progresses, residents and visitors alike can enjoy the last remnants of warmth before winter's chill begins to dominate.

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

The chart illustrates September temperature patterns in Deadwood, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec262135415266726961443730
Data source: Temperature data for Deadwood 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 Deadwood

September in Deadwood marks a transition as summer wanes, bringing 43 mm (1.7 in) of precipitation over 7 days. While this is a notable decrease from the lushness of May, which boasted 98 mm (3.9 in), it aligns with the overall pattern of diminishing rainfall as autumn approaches. The month encapsulates a balance between the summer's wetness and the drier months ahead, slightly surpassing the drier conditions of August. This gradual decline in precipitation hints at the impending chill of the fall season, reminding residents and visitors alike that while the vibrant hues of summer fade, the serene beauty of autumn in Deadwood is just beginning to unfold.

September Precipitation Trends in Deadwood

The chart displays monthly precipitation patterns in Deadwood, 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.
JanFebMarAprMayJunJulAugSepOctNovDec223339749865885843652131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Deadwood

As summer gradually gives way to autumn, September in Deadwood sees a notable shift in humidity, settling at 77%. This marks a slight decline from the 84% levels experienced during the peak months of July and August, contributing to a more comfortable atmosphere as the region begins to cool down. The humidity levels in September reflect a transitional phase, reminiscent of the spring months with their consistent figures around 70% to 76%. However, this early fall month maintains a notable higher level compared to the cooler months of October and November, which typically experience dipping humidity. This harmonious balance in September creates a uniquely refreshing environment, perfect for enjoying the scenic beauty of Deadwood.

September Average Humidity in Deadwood

This chart illustrates the average monthly humidity levels in Deadwood, 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.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%70%70%76%84%85%85%77%73%74%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Deadwood

As September rolls into Deadwood, the UV Index reaches 8, categorized as very high with a burn time of just 15 minutes. This marks a notable decrease from the peak summer months of June and July, where the Index soared to 11. However, it's a reminder that sun safety remains crucial even as the days grow shorter; protection is still warranted during outdoor activities. Interestingly, as autumn approaches, this drop follows a trend of declining UV levels, leading to values that will continue to taper off into the fall months. For residents and visitors, understanding these fluctuations is key to enjoying the great outdoors responsibly. For more on the local UV levels, check out Deadwood UV Index.

Maximum UV Index Levels in Deadwood for September

The chart shows the monthly maximum UV Index (UVI) for Deadwood 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.
JanFebMarAprMayJunJulAugSepOctNovDec346991111108532
Data source: Deadwood 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 Deadwood

As the summer heat wanes, September in Deadwood, United States, graces residents with a delightful 288 hours of sunshine, marking the transition into fall. This month retains a vibrant intensity reminiscent of the peak summer, yet subtly hints at the cozy embrace of autumn. Following a lively July and August, which boasted 382 and 357 hours of sunlight, respectively, September's sun-drenched days still shine brightly but begin tapering off, resulting in a noticeable decline. The month stands as a significant shift, as daylight hours start to dwindle, bringing with it a comforting warmth that invites outdoor activities amidst the backdrop of changing leaves. With October on the horizon, the balance between lingering summer brightness and the impending cooler months is beautifully captured, making September a unique time for reflection and enjoyment in this charming town.

Monthly Sunshine Duration in Deadwood: September Highlighted

The September sunshine duration represents the total number of hours Deadwood 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.
JanFebMarAprMayJunJulAugSepOctNovDec163h208h257h276h302h375h382h357h288h237h216h198h
Data source: Deadwood September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Deadwood During September

In Deadwood, United States, September offers a delightful chance of sunny weather, with a 68% likelihood of sunshine gracing the skies. This positions the month as a fantastic bridge between the summer and fall seasons, just slightly below the summer peak in August, which boasts a 70% chance of sunny days. Interestingly, the trend shows that as summer progresses into September, sunshine potential remains robust, maintaining a significant advantage over the earlier months of the year. With September benefiting from the tail end of summer's warmth and outdoor festivities, it's an ideal time for visitors and locals alike to enjoy the great outdoors in clearer skies.

Percentage of Sunny Days in September in Deadwood

The chart illustrates the percentage of sunny days in Deadwood 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 Deadwood experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec50%42%53%45%45%66%66%70%68%60%51%43%
Data source: Deadwood September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Deadwood in September

As summer fades into autumn, September in Deadwood, United States, brings a noticeable shift in daylight duration. The days begin to shorten, providing approximately 12 hours of daylight, a slight decline from the sun-kissed 15 hours enjoyed during the peak months of June and July. This transitional month serves as a bridge, leading from the vibrant and extended days of summer into the crisper and shorter daylight hours of fall. The gradual decrease in sunlight reflects the natural rhythm of the changing seasons, inviting residents and visitors alike to savor the linger of warm days before the approach of October's even shorter daylight span.

Average Daylight Hours in Deadwood for September

The chart illustrates the variation in daylight duration in Deadwood throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 15m10h 27m11h 57m13h 30m14h 49m15h 28m15h 6m13h 56m12h 27m10h 55m9h 34m8h 52m
Data source: Deadwood daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Deadwood

As September rolls into Deadwood, the wind begins to whisper softly, with an average speed of 3.1 m/s (7 mph), marking one of the quieter months in terms of breeze. This gentle decline follows a summer where winds hovered around 3.1 to 3.4 m/s, creating a calm atmosphere conducive to outdoor activities. Interestingly, throughout the year, wind speeds tend to ramp up from the start of winter, peaking in November at 4.3 m/s (10 mph). While September offers a peaceful respite, it also hints at the brisker days ahead, transitioning from the lighter summer breezes toward the revitalizing winds of autumn—reminding us that change is always just around the corner.

Average September Wind Speed in Deadwood

The chart displays monthly wind speed patterns in Deadwood, 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.
JanFebMarAprMayJunJulAugSepOctNovDec4.13.63.83.93.33.43.13.23.1 m/s3.84.34.2
Data source: Deadwood September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Deadwood Compares to Other Months

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

September and January present contrasting weather patterns. In September, temperatures can range widely, with a minimum of -3°C (27°F), an average of 16°C (61°F), and a maximum of 37°C (100°F). This month also experiences about 43 mm (1.7 in) of precipitation over seven days, accompanied by consistent humidity at 77%. In contrast, January is much colder, with temperatures ranging from a chilling -30°C (-22°F) to a maximum of 14°C (57°F) and an average of -3°C (26°F). Precipitation is lower at 22 mm (0.8 in) over six days, but the humidity remains steady at 77%. For more detailed weather insights, check out Deadwood weather in January.

September and February exhibit stark contrasts in weather conditions. In September, temperatures can swing significantly, with a minimum of -3°C (27°F) and soaring up to a maximum of 37°C (100°F), resulting in an average of 16°C (61°F). During this month, precipitation totals around 43 mm (1.7 in) over about 7 days, accompanied by a humidity level of 77%.

In contrast, February is characterized by much colder temperatures, with a minimum plunging to -29°C (-19°F) and an average of -6°C (21°F), peaking at a maximum of 18°C (65°F). Although there is slightly less precipitation at 33 mm (1.3 in), it occurs over more days, around 9, and the humidity is marginally higher at 80%. For a more detailed look at the February weather, you can check Deadwood weather in February.

When comparing the weather in September and March, the differences are quite striking. September boasts a wide temperature range, with nighttime lows around -3°C (27°F) and daytime highs reaching a sweltering 37°C (100°F), leading to an average of 16°C (61°F) amidst relatively high humidity at 77%. In contrast, March is significantly colder, with a minimum temperature of -26°C (-14°F) and a maximum of 21°C (69°F), resulting in an average of just 2°C (35°F). Although March sees slightly less precipitation at 39 mm (1.5 in) over 9 days, compared to September’s 43 mm (1.7 in) over 7 days, the overall atmosphere is drier with lower humidity at 70%. For more detailed insights into March weather, visit Deadwood weather in March.

When comparing September and April weather, there are notable contrasts in temperature and precipitation patterns. September boasts warmer average temperatures, ranging from a minimum of -3°C (27°F) to a maximum of 37°C (100°F), while April is much chillier, with an average temperature of 5°C (41°F) and extremes from -18°C (0°F) to 26°C (79°F). Additionally, September experiences less precipitation (43 mm) over fewer days (7) compared to April's 74 mm spread over 11 days. Despite the higher humidity in September at 77%, April maintains a relatively comfortable humidity level at 70%. For those looking for more details about conditions in April, check out Deadwood weather in April.

September and May present contrasting weather patterns. September boasts a wider temperature range, with temperatures fluctuating between a minimum of -3°C (27°F) and a scorching maximum of 37°C (100°F), resulting in an average of 16°C (61°F). In contrast, May experiences a cooler average temperature of 11°C (52°F), with highs reaching only 31°C (88°F) and a minimum temperature of -4°C (26°F). Precipitation is notably higher in May, with 98 mm (3.9 in) falling over 15 days compared to September's 43 mm (1.7 in) across just 7 days. Both months experience similar humidity levels, with September at 77% and May slightly lower at 76%. For more details about May weather, check out Deadwood weather in May.

In comparing the weather of September and June, both months experience high maximum temperatures, peaking at around 37°C (100°F) in September and 37°C (99°F) in June. However, September has a wider temperature range, with minimum temperatures dropping to -3°C (27°F) compared to June's milder minimum of 4°C (40°F). Additionally, June sees higher average temperatures at 19°C (66°F) versus September's 16°C (61°F). Precipitation levels also differ, with June receiving 65 mm (2.6 in) over 11 days, while September has less rainfall at 43 mm (1.7 in) over 7 days. Humidity is slightly lower in September at 77%, compared to June’s 84%. For a more detailed overview, check out Deadwood weather in June.

When comparing the weather in September and July, notable differences emerge in temperature and precipitation. September experiences a wider temperature range, with minimums dropping to -3°C (27°F), averaging 16°C (61°F), and reaching maximums of 37°C (100°F). In contrast, July offers milder minimums of 9°C (49°F) and an average of 22°C (72°F), peaking at 39°C (103°F). Precipitation levels are also distinct, with September receiving 43 mm (1.7 in) over about 7 days, while July sees nearly double, at 88 mm (3.4 in) across 12 days, resulting in higher humidity in July at 85%, compared to September's 77%. For a more detailed look into July conditions, visit Deadwood weather in July.

In comparing the weather conditions of September and August, September exhibits a notable decline in minimum temperatures, dropping to -3°C (27°F) from August's 5°C (42°F). However, both months experience the same maximum temperature of 37°C (100°F), indicating that while early September can be quite warm, the nights are significantly cooler. Additionally, September sees a slight decrease in overall precipitation, with 43 mm (1.7 in) falling over 7 days, compared to August's 58 mm (2.3 in) over 8 days. Humidity levels are also lower in September at 77%, compared to August's 84%. For a more detailed view of August weather, visit Deadwood weather in August.

September and October present notable contrasts in weather. September typically features a wider temperature range, with minimums around -3°C (27°F) and maximums soaring up to 37°C (100°F), averaging a comfortable 16°C (61°F). However, it also experiences a fair amount of precipitation at 43 mm (1.7 in) over about 7 days, with humidity levels at 77%. In contrast, October sees a significant drop in average temperatures, with minimums plummeting to -21°C (-5°F) and an average of just 7°C (44°F), while maximum temperatures remain milder at 31°C (88°F). The month is wetter, with 65 mm (2.5 in) of rainfall over 9 days, and slightly lower humidity at 73%. For more detailed information about the weather specifics in October, you can check Deadwood weather in October.

September and November present starkly different weather patterns. September boasts a wide temperature range, with minimums dipping to -3°C (27°F) and maximums soaring up to 37°C (100°F), while maintaining an average of 16°C (61°F). The month also experiences relatively high humidity at 77% and 43 mm (1.7 in) of precipitation over 7 days. In contrast, November brings much colder conditions, with temperatures plunging to a minimum of -19°C (-2°F) and an average of just 3°C (37°F). Although the maximum temperature is a milder 24°C (76°F), November sees decreased precipitation, totaling 21 mm (0.8 in) across the same 7 days and a slightly lower humidity of 74%. For more detailed insights, check out Deadwood weather in November.

September and December showcase a striking contrast in weather patterns. September experiences a broader temperature range with a minimum of -3°C (27°F) and a maximum of 37°C (100°F), resulting in an average of 16°C (61°F). This month typically sees 43 mm (1.7 in) of precipitation over about 7 days, with humidity levels at 77%. In contrast, December brings much colder temperatures, with a minimum of -24°C (-12°F) and a maximum of 21°C (70°F), averaging around -1°C (30°F). The precipitation decreases slightly to 31 mm (1.2 in) for the same duration of 7 days, while humidity remains high at 79%. For those interested in specific weather details for December, more information can be found at Deadwood weather in December.

Compare Deadwood's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Deadwood

As summer gives way to autumn, September brings a striking transition in Deadwood's weather. The sweltering temperatures of the peak summer months begin to cool, with averages settling comfortably around 16°C (61°F) while the occasional rise to 37°C (100°F) still reminds us of the heat. Rain becomes a more familiar companion with about 43 mm of precipitation spread over a few days, contrasting sharply with the drier summer months. The increased humidity levels, hovering around 77%, add a different texture to the air, often making it feel warmer than it is. For those interested in understanding the full scope of Deadwood's climate and seasonal changes, check out Deadwood Climate for more insights.