Last updated: February 24, 2025
In September, the Grand Canyon showcases a striking range of temperatures, with maximums soaring to 37°C (100°F), while enjoying a comfortable average of 22°C (71°F) and dropping to a cool minimum of 3°C (37°F) at night. This month experiences minimal rainfall, totaling just 14 mm (0.5 in) over three days, allowing visitors to relish the breathtaking views without the interruption of heavy weather. With humidity levels around 59%, the air maintains a pleasant warmth, making September an ideal time to explore the natural wonders of this majestic landscape.
September marks a transition into milder weather at the Grand Canyon, with nighttime temperatures dipping to a refreshing 3°C (37°F), while daytime highs reach a warm 37°C (100°F). The average temperature settles around 22°C (71°F), providing a pleasant balance for outdoor activities and exploration. As summer's intensity wanes, visitors can enjoy the stunning vistas and hiking trails in more comfortable conditions. This month reflects a clear downward trend in nighttime lows compared to the scorching summer, while still allowing for ample warmth during the day. Such variability highlights the region's unique climate, making September an ideal time to witness the diverse beauty of the canyon.
In September, the Grand Canyon experiences a modest precipitation amount of 14 mm (0.5 in), falling on about three days of the month. This slight increase over the summer months, particularly July and August, suggests a transition towards autumn, though overall rainfall remains low. September's precipitation aligns closely with the driest months, June and April, highlighting the typically arid conditions of the region. As the canyon shifts gears into fall, this modest rain serves as a reminder of the varying climatic patterns that define the landscape, setting the stage for the wetter months ahead.
As September unfolds in the Grand Canyon, humidity begins to rise, providing a refreshing shift from the parched summer months. With humidity levels averaging 59%, September marks a notable increase from the 33% recorded in July and 35% in June. This transition hints at the approaching autumn, where moisture gradually returns to the desert landscape. Compared to the earlier summer lows, September's humidity sets the stage for more comfortable temperatures and vibrant scenery, making it a delightful time for visitors to experience the changing season. Following this, humidity levels will continue to climb as the year progresses, reaching 70% in October and peaking again in the winter months, continuing the rhythmic dance of nature in this breathtaking region.
In September, the UV Index at the Grand Canyon reaches 10, categorizing it as very high, with a burn time of just 15 minutes. This marks a slight decrease from the sweltering peaks of summer months, where the index hit a relentless 12. As the days begin to shorten and temperatures cool, caution is still essential for outdoor explorers, highlighting the importance of sun protection even as the season transitions. Visitors should stay alert to changing UV conditions, making informed choices to safeguard their skin while immersing themselves in the stunning landscapes. For detailed UV index data, check out Grand Canyon UV Index.
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As summer gently gives way to autumn, September in the Grand Canyon shines with an impressive 321 hours of sunlight. This marks a noticeable decline from the peak summer months, yet still offers a warm embrace of daylight perfect for exploration. Following May's high of 373 hours, sunlight begins to taper off, reflecting nature's rhythmic cycle. Interestingly, September's hours remain remarkably robust compared to October's 294 hours, allowing visitors to bask in the beautiful vistas a little longer before the days grow shorter. As the shadows lengthen and hues of red and gold begin to dress the canyon, September stands out as a transition month brimming with both warmth and wonder.
September in the Grand Canyon brings a delightful 77% chance of sunny weather, making it one of the sunniest months of the year. As summer transitions into autumn, the trend shows a marked improvement compared to the peak of July, which has a notably lower 43% chance of sunshine. Following the pattern established in late spring and throughout summer, September's sunny disposition stands out as locals and visitors alike welcome the post-summer warmth. This month not only offers a great opportunity for stunning vistas under the clear skies, but also hints at the pleasant weather ahead, as October maintains a respectable 68% chance of sun. Thus, September emerges as an ideal time for exploration, with ample opportunities to experience the breathtaking beauty of the canyon bathed in sunlight.
As September unfolds in the Grand Canyon, the daylight duration begins a subtle yet noteworthy decline, offering 12 hours of daylight. This shift marks a transition from the sun-drenched summer months of July and August, which bask in 14 and 13 hours of light, respectively. The days gradually shorten as autumn approaches, following the trend from the longer spring days that peak in May and June. This gradual reduction hints at the approaching cooler months, bringing a unique beauty to the Grand Canyon, where the interplay of light and shadow across its majestic landscapes creates stunning vistas that captivate visitors. As the season progresses into October, daylight will dim further, paving the way for the enchanting colors of fall to emerge.
As September unfolds in the Grand Canyon, the wind whispers through the majestic cliffs at an average speed of 2.2 m/s (5 mph), marking a gentle decline from the breezy heights of summer. Following the seasonal pattern, wind speeds tend to peak in the early spring months, with March and April showcasing lively gusts nearing 3.3 m/s (7 mph). The late summer months of July and August witness a slight lull, with winds softening to 2.1 m/s (5 mph) and 2.6 m/s (6 mph), respectively. September continues this trend, ushering in the softer winds of fall, which hint at the cooler weather ahead. As autumn approaches, the comforting embrace of the canyon's stillness becomes more pronounced, inviting visitors to experience its serene beauty in a refreshing atmosphere.
The weather in Grand Canyon 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 Grand Canyon and find detailed weather information for every month.
September and January present starkly contrasting weather conditions. In September, temperatures can range from a refreshing 3°C (37°F) in the early morning to a scorching high of 37°C (100°F) during the day, with an average of 22°C (71°F). The month also experiences relatively low humidity at 59% and minimal rainfall, totaling just 14 mm (0.5 in) over three days.
In contrast, January brings much colder weather, with temperatures dipping as low as -17°C (2°F) and only reaching a maximum of 17°C (63°F), averaging around 2°C (36°F). This month is wetter, with 40 mm (1.6 in) of precipitation across six days, and elevated humidity at 80%. The difference in climate makes September more favorable for outdoor activities, while January's chill creates a winter atmosphere. For more details on what to expect during this time, check out the Grand Canyon weather in January.
September and February present starkly contrasting weather conditions. In September, temperatures range from a minimum of 3°C (37°F) to a sweltering maximum of 37°C (100°F), with an average of 22°C (71°F). This month sees relatively low precipitation at 14 mm (0.5 in) over just three days and a comfortable humidity of 59%. Conversely, February is much colder, with temperatures dipping as low as -16°C (4°F) and averaging around 3°C (38°F), peaking at 19°C (66°F). Precipitation is more frequent in February, totaling 43 mm (1.7 in) over seven days, and humidity levels rise significantly to 83%. For more detailed insights, check out Grand Canyon weather in February.
When comparing the weather in September and March, it's evident that both months exhibit distinct characteristics. September enjoys a milder average temperature of 22°C (71°F), with high temperatures reaching up to 37°C (100°F) and relatively low precipitation at 14 mm (0.5 in) over just 3 days. In contrast, March is considerably cooler, with an average temperature of 7°C (45°F) and nighttime lows dipping to -14°C (7°F). This month also sees higher precipitation, totaling 48 mm (1.9 in) over about 8 days, accompanied by increased humidity at 72%. For more specific details on weather patterns, you can check out Grand Canyon weather in March.
In comparing September and April, it's clear that these months present quite different weather patterns. September typically enjoys warmer temperatures, with averages around 22°C (71°F), peaking at a sweltering 37°C (100°F), while April is cooler, with average temperatures of 13°C (56°F) and highs reaching only 30°C (87°F). Precipitation levels are fairly similar, with September receiving 14 mm (0.5 in) over approximately 3 days and April close behind at 13 mm (0.5 in) over just 2 days. Humidity also plays a role, as September has a slightly lower average at 59% compared to April’s 63%. For a more detailed look at how the weather unfolds in April, you can visit Grand Canyon weather in April.
September and May present notable differences in weather patterns. In September, temperatures range from a minimum of 3°C (37°F) to a maximum of 37°C (100°F), with an average of 22°C (71°F). The month experiences relatively low precipitation, with 14 mm (0.5 in) over three days and a humidity level of 59%. In contrast, May sees slightly cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 34°C (93°F), averaging 17°C (64°F). It receives a bit more precipitation at 18 mm (0.7 in) across three days but enjoys lower humidity at 46%. For a detailed look at May's weather, you can visit Grand Canyon weather in May.
In comparing the weather between September and June, September offers cooler temperatures, with daily averages ranging from a minimum of 3°C (37°F) to a maximum of 37°C (100°F), and a moderate level of humidity at 59%. This month typically sees around 14 mm (0.5 in) of precipitation, occurring on about three days. In contrast, June is warmer overall, boasting an average temperature of 24°C (76°F) with highs reaching up to 38°C (102°F) and a minimum of 7°C (45°F). Notably, June experiences very little rain, with only 3 mm (0.1 in) recorded on no days, and significantly lower humidity at 35%. For more detailed insights, you can check Grand Canyon weather in June.
Overall, while both months can be warm, September is characterized by greater temperature variability and increased moisture, making it feel more humid than the dry heat of June.
When comparing the weather in September to that of July, we observe notable differences in temperature, precipitation, and humidity. September experiences a broader temperature range, with minimums as low as 3°C (37°F) and maximums reaching up to 37°C (100°F), while July starts at a higher minimum of 13°C (56°F) and can peak at 40°C (105°F). Moreover, September receives less precipitation at 14 mm (0.5 in) over 3 days, compared to July's 24 mm (1.0 in) over 7 days. The humidity levels also vary significantly; September's humidity sits at 59%, making it feel more comfortable compared to July's drier 33%. For more details on July weather, you can check out Grand Canyon weather in July.
In comparing the weather of September and August, we notice a shift in temperatures and humidity levels. September experiences a broader temperature range, with minimums dropping to 3°C (37°F) and maximums reaching 37°C (100°F), resulting in an average of 22°C (71°F). In contrast, August offers warmer conditions with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 38°C (100°F), averaging at 26°C (79°F). While both months see similar levels of precipitation—14 mm (0.5 in) in September and 15 mm (0.6 in) in August—the humidity level is notably higher in September at 59%, compared to August’s 41%. For further details about the weather patterns during this time, you can refer to Grand Canyon weather in August.
In September, the weather is generally warm with an average temperature of 22°C (71°F) and a maximum soaring to 37°C (100°F). Precipitation is minimal at 14 mm (0.5 in) over just 3 days, and humidity sits at a comfortable 59%. In contrast, October experiences a notable drop in temperatures, with averages around 14°C (57°F), and minimums dipping to -6°C (22°F). Precipitation increases slightly to 23 mm (0.9 in) over 4 days, accompanied by a rise in humidity to 70%. For more detailed information, check out this link: Grand Canyon weather in October.
September weather is characterized by warm temperatures, with averages around 22°C (71°F) and highs reaching up to 37°C (100°F). It typically experiences low precipitation, averaging just 14 mm (0.5 in) over about three days, and maintains a comfortable humidity level of 59%. In contrast, November brings a notable drop in temperatures, featuring a minimum of -8°C (17°F) and an average of 8°C (47°F). While it sees slightly more precipitation at 19 mm (0.8 in) over two days, the higher humidity of 79% can make the cooler weather feel quite brisk. For further details on the weather in November, visit Grand Canyon weather in November.
September weather tends to be much warmer and more variable than December, with average temperatures reaching a pleasant 22°C (71°F) and highs that can soar up to 37°C (100°F). During this month, the precipitation is relatively low at 14 mm (0.5 in), falling over just three days, while humidity hovers around 59%. In contrast, December experiences much colder temperatures, with an average of 3°C (37°F) and morning lows plunging to -16°C (4°F). This winter month sees increased precipitation at 33 mm (1.3 in) across six days, accompanied by higher humidity levels at 82%. For a more detailed look at December conditions, visit Grand Canyon weather in December.
As September unfolds in the Grand Canyon, visitors can expect a remarkable transition in weather. With daytime temperatures peaking at a warm 37°C (100°F) and a pleasant average of 22°C (71°F), it's a perfect time to explore the breathtaking scenery. Nights bring a cooler respite, with temperatures dropping to around 3°C (37°F). Unlike the wetter months earlier in the year, September sees minimal precipitation, only around 14 mm over three days, making it an ideal period for outdoor activities. The humidity hovers at a comfortable 59%, adding to the overall pleasant atmosphere. Whether you're hiking the trails or simply soaking in the views, September offers a unique blend of summer warmth and fall's mildness. For more details on what to expect, check out Grand Canyon Climate.