August Weather in Keystone, United States

Last updated: February 24, 2025

Experience the August weather in Keystone, United States, where delightful summer temperatures paint a picturesque landscape. With a maximum of 22°C (73°F) and an average of 11°C (52°F), outdoor enthusiasts can revel in a comfortable climate. However, prepare for some chill with a minimum of 0°C (32°F) during cooler nights. August sees a total precipitation of 53 mm (2.1 in) over 11 days, ensuring a lush environment. With humidity levels at 56%, the air remains refreshingly crisp, making it an ideal time for adventures amidst the stunning natural beauty of Keystone.

August Temperature in Keystone

In Keystone, United States, August welcomes a breath of warmth as summer reaches its peak. With temperatures ranging from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), the average settles comfortably at 11°C (52°F), marking a distinct shift from the frigid depths of winter seen just a few months prior. This transition showcases a significant warming trend, as temperatures progressively rise from the harsh lows of January through July's mild conditions. August's pleasant climate encourages outdoor activities and scenic explorations, making it an ideal time to experience the beauty of the Black Hills. As the month concludes, residents and visitors alike can notice the early signs of autumn creeping in, foreshadowing the cooler temperatures of September.

August Weather in Keystone: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Keystone, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec131422273546525145302013
Data source: Temperature data for Keystone generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Keystone

In August, Keystone experiences a moderate precipitation total of 53 mm (2.1 in) over approximately 11 days, marking a shift from the wetter conditions of July, which typically sees the highest rainfall of the year at 83 mm. This steady decline in precipitation from late spring through summer is reflective of the region's transition toward autumn, with August's rainfall amount aligning closely with the average for the month in prior years. As the summer heat begins to fade, residents can expect these drier days to pave the way for the cooler, invigorating days of September, which typically brings 43 mm (1.7 in) across just 9 days. This pattern illustrates Keystone's climate rhythm, where summer's heavy rains gradually give way to the dryer conditions of fall.

August Precipitation Trends in Keystone

The chart displays monthly precipitation patterns in Keystone, with values for each month alongside August's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec415967788150835343564143
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Keystone

In August, Keystone experiences a slight uptick in humidity, averaging around 56%. This marks a modest increase from July's low of 52% but remains significantly lower than the levels seen earlier in the year. As the summer progresses, the trend shows a gradual rise in humidity that typically peaks in the late fall and winter months, with levels hitting a high of 89% in December. This pattern underscores the contrast between the dry summer months and the moist winters, highlighting Keystone’s seasonal shifts and the lingering warmth of late summer.

August Average Humidity in Keystone

This chart illustrates the average monthly humidity levels in Keystone, with August's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how August's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Keystone

The August UV Index in Keystone, United States, is notably high, registering at 12 on the scale, categorizing it as extreme and indicating a burn time of just 10 minutes for unprotected skin. This trend reflects a sustained intensity in UV exposure typical for summer months. As spring transitions into summer, the index reached a peak of 14 in June, with values only slightly decreasing to 13 in July and 12 in August. Following this pattern, it begins to taper off in September, signaling the gradual decline into fall. It's crucial for residents and visitors alike to remain vigilant during this period, as prolonged sun exposure can quickly lead to skin damage. For more detailed insights, check out Keystone UV Index.

Maximum UV Index Levels in Keystone for August

The chart shows the monthly maximum UV Index (UVI) for Keystone in August, 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.
JanFebMarAprMayJunJulAugSepOctNovDec469121314131211754
Data source: Keystone August 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.

August Sunshine in Keystone

In August, Keystone basks in an impressive 357 hours of sunshine, marking a slight dip from the peak summer months of June and July, both boasting 382 hours. This late summer glow is a wonderful time to soak up the sun before the shorter days of autumn set in. As the year progresses, sunshine hours gradually decline, with September offering a still generous 314 hours, hinting at the fleeting warmth of summer. The trend reflects a transition from the vibrant, sun-drenched days of mid-summer to the comforting hues of fall, making August a perfect month to enjoy the great outdoors while it lasts.

Monthly Sunshine Duration in Keystone: August Highlighted

The August sunshine duration represents the total number of hours Keystone experiences direct sunlight during the month of August, excluding cloudy or obstructed periods. This chart compares the sunshine duration of August with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec183h232h291h316h355h382h382h357h314h280h247h237h
Data source: Keystone August Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Keystone During August

August in Keystone, United States, welcomes a notable increase in sunny weather, boasting a 61% chance of sunshine. This marks a peak in the year, reflecting a trend toward brighter days as summer reaches its zenith. Following a string of relatively moderate chances from January through July, the jump to 61% in August signals not only a shift in the season, but also promises longer, warmer days perfect for outdoor activities. As summer transitions into autumn, the chance of sunshine remains high, with September continuing the trend at 65%. Embrace the sun-filled days of August; it's the perfect time to enjoy everything Keystone has to offer under clear blue skies.

Percentage of Sunny Days in August in Keystone

The chart illustrates the percentage of sunny days in Keystone throughout the year, with August 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 Keystone experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec48%38%47%52%42%52%48%61%65%54%60%53%
Data source: Keystone August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Keystone in August

In Keystone, United States, August marks a transition point in daylight duration as summer begins to wane. The month enjoys around 13 hours of daylight, slightly less than the peak of 14 hours experienced in June and July. As the days grow shorter, the gradual decline in sunlight reflects the impending arrival of autumn, with September promising just 12 hours of daylight to follow. This rhythm of daylight is a vivid reminder of nature’s cycles, where longer summer days give way to the cozy embrace of fall, inviting residents and visitors alike to savor the lingering warmth of summer before the crispness of autumn sets in.

Average Daylight Hours in Keystone for August

The chart illustrates the variation in daylight duration in Keystone throughout the year, with August highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 44m10h 43m11h 58m13h 16m14h 21m14h 53m14h 35m13h 37m12h 23m11h 6m9h 59m9h 25m
Data source: Keystone daylight hours, calculated by summing the hours between sunrise and sunset for each day.

August Winds in Keystone

In August, the gentle breezes of Keystone, United States, bring a modest average wind speed of 2.0 m/s (5 mph), mirroring the calmness of the preceding months. As summer draws to a close, this reflects a slight uptick from July's low of 1.8 m/s (4 mph), suggesting a faint resurgence of winds as the season transitions. Notably, the summer months reveal a consistent decline in wind speeds, with June hitting its annual minimum. However, in contrast to the summer lull, autumn beckons winds that gradually pick up strength, as evidenced by the increase from 2.0 m/s in September to 2.5 m/s in October. This pattern highlights a natural rhythm in Keystone's climate, where the calm of summer gives way to the brisk, refreshing gusts of fall.

Average August Wind Speed in Keystone

The chart displays monthly wind speed patterns in Keystone, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.73.22.52.62.42.01.82.0 m/s2.02.52.82.9
Data source: Keystone August wind data, generated using information from the Copernicus Climate Change Service.

How August Weather in Keystone Compares to Other Months

The weather in Keystone changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Keystone and find detailed weather information for every month.

August and January present contrasting weather experiences. In August, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), with an average of 11°C (52°F). This month sees about 53 mm (2.1 in) of precipitation over approximately 11 days, while the humidity levels hover around 56%. In stark contrast, January brings much colder conditions, with temperatures dropping as low as -26°C (-15°F) and peaking at just 5°C (42°F), averaging -11°C (13°F). Although January experiences slightly less precipitation at 41 mm (1.6 in) over 10 days, the humidity is notably higher at 88%. For more details on January weather, check out Keystone weather in January.

The weather in August is significantly milder compared to February, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), and an average of 11°C (52°F). In contrast, February features much colder temperatures, with a minimum of -28°C (-19°F) and an average of -10°C (14°F), reaching a maximum of only 9°C (48°F). Additionally, while August experiences relatively lower humidity at 56% and 53 mm of precipitation over 11 days, February sees a much higher humidity level of 87% along with 59 mm of precipitation over 14 days. For more detailed information on the February conditions, you can check Keystone weather in February.

August and March present strikingly different weather conditions. In August, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), with an average of 11°C (52°F), while humidity is relatively moderate at 56%. There is also a total precipitation of 53 mm (2.1 inches) spread over about 11 days. In contrast, March experiences much colder temperatures, ranging from a minimum of -25°C (-12°F) to a maximum of 9°C (49°F), and an average of -5°C (22°F). The month sees higher humidity levels at 81% and slightly more precipitation at 67 mm (2.7 inches) over 14 days. For a closer look at March's weather specifics, you can check out Keystone weather in March.

When comparing the weather in August and April, there is a stark contrast in temperatures and overall conditions. August experiences milder temperatures, with an average of 11°C (52°F), while April's average is a chilly -3°C (27°F). Precipitation is fairly consistent in both months, with August receiving 53 mm (2.1 in) over 11 days, compared to April's higher total of 78 mm (3.1 in) over 13 days. Furthermore, humidity levels are notably different, with August at 56% and April at a higher 76%. This comparison highlights how much warmer and less humid August is compared to the colder and wetter April. For more details on April weather, you can check Keystone weather in April.

When comparing the weather in August and May, there are notable differences in temperature and precipitation. August generally enjoys milder conditions with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 22°C (73°F) and an average of 11°C (52°F). In contrast, May experiences cooler temperatures, with a minimum of -13°C (10°F), an average of 2°C (35°F), and a maximum of 17°C (63°F).

Precipitation levels also vary, with August receiving 53 mm (2.1 in) over about 11 days, while May has higher precipitation at 81 mm (3.2 in), occurring over 14 days. The humidity in August is slightly lower at 56% compared to 66% in May, contributing to the more comfortable summer atmosphere. For more details on May's weather, visit Keystone weather in May.

When comparing the weather in August and June, it's evident that August tends to be slightly warmer, with average temperatures reaching 11°C (52°F) compared to June's 8°C (46°F). While both months experience similar precipitation levels, with August receiving 53 mm (2.1 in) over 11 days and June experiencing 50 mm (2.0 in) over 10 days, August is marginally wetter. Additionally, June has a slightly higher humidity level at 58% compared to August’s 56%. For more detailed information, check out Keystone weather in June.

In comparing the weather of July and August, both months show similar average temperatures, with July's average at 11°C (53°F) and August slightly warmer at 11°C (52°F). However, July experiences a slightly higher maximum temperature of 23°C (74°F) compared to August's 22°C (73°F). Precipitation levels are more pronounced in July, with 83 mm (3.3 in) recorded over 15 days, whereas August sees less rain at 53 mm (2.1 in) over 11 days. Additionally, humidity is slightly higher in August at 56%, compared to 52% in July. For more detailed insights on July weather, check out this link: Keystone weather in July.

August and September present a noticeable shift in weather patterns. In August, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), with an average temperature of 11°C (52°F). The month experiences 53 mm (2.1 in) of precipitation over 11 days and humidity sits at 56%. In contrast, September sees a drop in minimum temperatures to -11°C (13°F) and an average of 7°C (46°F), while the maximum remains similar at 22°C (72°F). Precipitation decreases slightly to 43 mm (1.7 in) over 9 days, with humidity rising to 65%. For more detailed weather information, you can check Keystone weather in September.

The weather in August is markedly milder than in October, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), averaging around 11°C (52°F). Precipitation in August is moderate at 53 mm (2.1 in) over 11 days and comes with a relatively comfortable humidity level of 56%. In comparison, October experiences much colder temperatures, with a minimum of -24°C (-10°F) and an average of -1°C (31°F), peaking at 17°C (63°F). The slight increase in precipitation to 56 mm (2.2 in) over 9 days coincides with a higher humidity of 76%. For detailed October weather insights, you can visit Keystone weather in October.

August and November weather offer contrasting experiences, with August characterized by milder temperatures and relatively higher humidity. In August, temperatures range from a minimum of 0°C (32°F) to a maximum of 22°C (73°F), accompanied by an average temperature of 11°C (52°F). Precipitation is moderate, occurring over 11 days with a total of 53 mm (2.1 in) of rain, and humidity sits at 56%.

In stark contrast, November brings much colder conditions, with temperatures dipping to a minimum of -27°C (-17°F) and reaching a maximum of 10°C (50°F), averaging -7°C (20°F). The month sees less precipitation overall, totaling 41 mm (1.6 in) over 8 days, but the humidity is higher at 82%, creating a sharp chill in the air. For more details on the weather in November, see Keystone weather in November.

August and December present stark contrasts in weather conditions. In August, temperatures can range from a chilly 0°C (32°F) to a warm max of 22°C (73°F), with an average of 11°C (52°F). The month experiences 53 mm (2.1 in) of precipitation over approximately 11 days, accompanied by a moderate humidity level of 56%. In contrast, December plunges into much colder territory, featuring minimum temperatures of -29°C (-20°F) and an average of -11°C (13°F), reaching a maximum of 8°C (47°F). With 43 mm (1.7 in) of precipitation spread across 10 days, December also has significantly higher humidity at 89%. For more detailed insights on December weather, check out Keystone weather in December.

Compare Keystone's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in Keystone

August in Keystone presents a unique transition from the summer warmth into the cooler fall months. While temperatures can reach a pleasant maximum of 22°C, the average temperature dips significantly, making it cooler than the peak summer months. Rainfall is more prevalent, with precipitation occurring on about 11 days, contributing to the lush scenery that characterizes this time of year. The humidity level remains moderate, enhancing the fresh mountain air. Overall, August offers a refreshing experience, perfect for those who enjoy milder weather and the beauty of nature. For more detailed insights on this month’s climate, visit Keystone Climate.