Last updated: February 24, 2025
September in Sonora, United States is characterized by warm to hot temperatures, where daily highs can reach up to 40°C (105°F) while the average settles around a comfortable 22°C (72°F). The nights can be cool, dipping to a minimum of 7°C (45°F), providing a pleasant reprieve from the day's heat. Precipitation is minimal, with only about 4 mm (0.2 in) recorded over just 1 day, and humidity levels averaging 55% contribute to the overall dry climate. This month is ideal for enjoying outdoor activities amidst the vibrant and arid landscape.
In September, temperatures in Sonora showcase the last gasps of summer, as the region transitions into the cooler fall months. The minimum temperature hovers around 7°C (45°F), offering a slight chill compared to the hot summer nights. The average temperature of 22°C (72°F) provides a comfortable backdrop for outdoor activities, while the maximum can still peak at a scorching 40°C (105°F), echoing the relentless heat of August. This blend of moderate mornings and sweltering afternoons reflects the month’s transitional nature, making September a unique time for visitors to experience the warm remnants of summer alongside the impending embrace of autumn.
In September, Sonora experiences a slight uptick in precipitation with 4 mm (0.2 in) of rain, although it marks an end to the prolonged dry spell seen in the preceding months of July and August, which recorded 0 mm. With only 1 day of precipitation, September remains relatively dry compared to the earlier months, but it heralds the transition into the wetter fall season. This contrasts significantly with the heavier rains typically seen in the winter months, where precipitation can reach as high as 183 mm (7.2 in) in January. Overall, September serves as a gentle reminder of the region’s seasonal shifts, paving the way for more regular rainfall in the months to follow.
As summer winds down in Sonora, September brings a noticeable shift in humidity, with levels dropping to 55%. This marks a continuation of the declining trend observed from the peak humidity of 84% in February down to the 54% recorded in August. The gradual decrease throughout the warmer months reflects a transition toward more comfortable conditions as the fall approaches. Following September, humidity levels are expected to rise again in October, reaching 62%, as the region prepares for the cooler, more humid months ahead. Overall, the humidity in September hints at the changing seasons, offering a refreshing reprieve after the sultry summer days.
As September rolls into Sonora, residents can expect a UV Index of 9, categorizing it as very high. This index indicates a slight decrease from the extreme levels seen during the peak summer months of May through August, when burn times dropped to just 10 minutes under direct sunlight. However, the potential for skin damage remains significant, with a recommended burn time of only 15 minutes this month. Overall, September reflects a gradual easing in the UV threat as temperatures begin to cool, though vigilance is still essential for sun safety. For more insights on UV exposure trends throughout the year, check out the information available at Sonora UV Index.
UV Risk Categories
In Sonora, United States, September shines brightly with 321 hours of sunshine, marking a delightful transition from the summer's peak radiance. Following the sun-soaked months of June and July, which bask in 388 and 396 hours respectively, September offers a slight but refreshing dip in daylight. However, it still stands out as one of the sunniest months of the year, preceding the gradual decline into the cooler autumn months of October and November, where hours drop to 290 and 234. This trend highlights a natural ebb and flow of sunlight, reminding residents and visitors alike to savor the lingering warmth of early fall while it lasts.
As September rolls in, Sonora enjoys a remarkable 89% chance of sunny weather, solidifying its reputation as one of the sunniest months of the year. This follows a summer pattern where August peaks at an impressive 96%, highlighting a trend of abundant sunshine throughout late summer. Interestingly, after reaching this seasonal high, September maintains a strong presence of clear skies, providing ideal conditions for outdoor activities and soaking up the sun. This consistent sunny trend is captivating when juxtaposed with the cooler, cloudier months of late fall and winter, such as January and December, where the likelihood of sun drops significantly to 44% and 40% respectively. Thus, September stands out as a golden period for sun seekers in Sonora, ensuring that the warmth of summer lingers a little longer before the shift into autumn.
As September rolls into Sonora, the daylight hours begin to shift, marking a subtle transition from the long days of summer to the shorter days of fall. With 12 hours of daylight, September sees a slight decline from the peak of 14 hours experienced in the height of summer. This month acts as a bridge, gracefully tapering off the summer abundance of sunlight while still providing ample time for outdoor activities. Following the vibrant days of May and June, where daylight stretches luxuriously, the gradual descent into October with its 11 hours hints at the approaching winter months, promising cozy evenings ahead. This ebb and flow of daylight not only reflects the changing seasons but also enriches the natural rhythm of life in Sonora.
In September, the wind in Sonora, United States, maintains a moderate average speed of 2.3 m/s (5 mph), mirroring the calm breezes of both August and the preceding months. Throughout the year, wind speeds show a subtle fluctuation, with a gentle increase peaking in May at 2.6 m/s (6 mph) before gradually tapering off as the year progresses. After September, the wind dips slightly in October to remain steady, only to experience a notable decline in November, where it reaches its annual low of 1.8 m/s (4 mph). This seasonal pattern illustrates a consistent calmness in Sonora’s September winds, a tranquil prelude to the stillness of winter.
The weather in Sonora 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 Sonora and find detailed weather information for every month.
September and January present stark contrasts in weather conditions. September boasts a mild average temperature of 22°C (72°F), with highs soaring up to 40°C (105°F), alongside very little precipitation (only 4 mm or 0.2 in over a day), and a moderate humidity of 55%. In contrast, January experiences significantly cooler temperatures, with an average of 8°C (46°F) and lows dipping to -6°C (22°F). This month also sees much higher precipitation at 183 mm (7.2 in) spread over 8 days, coupled with increased humidity levels at 82%. For more detailed insights into January weather, check out Sonora weather in January.
September and February showcase a stark contrast in weather patterns. September typically enjoys warm temperatures ranging from a minimum of 7°C (45°F) to a maximum of 40°C (105°F), with average readings around 22°C (72°F) and only minimal rainfall of 4 mm (0.2 in), resulting in a relatively dry month with a humidity level of 55%. In contrast, February experiences much cooler conditions, with temperatures dropping to a minimum of -6°C (22°F) and averaging 8°C (47°F), peaking at 24°C (75°F). This month is significantly wetter, with precipitation reaching 180 mm (7.1 in) over 9 days and a higher humidity of 84%. The distinctive climate differences between the two months highlight the transition from late summer warmth to the chill and moisture of winter. For more detailed weather information, you can visit Sonora weather in February.
September and March present quite contrasting weather conditions. In September, temperatures range from a comfortable minimum of 7°C (45°F) to a hot maximum of 40°C (105°F), with an average of 22°C (72°F) and very little precipitation, just 4 mm (0.2 in) over a single day. The humidity sits at a moderate 55%, making it feel warm but not oppressive. In stark contrast, March experiences a wider range of temperatures, from a chilly -2°C (28°F) to a pleasant 27°C (80°F), with an average temperature of 10°C (51°F). This month is much wetter, receiving 197 mm (7.7 in) of precipitation over 13 days, and the humidity climbs to 82%, contributing to a more damp and cool atmosphere. For more detailed insights, check out Sonora weather in March.
September and April present quite contrasting weather conditions. In September, temperatures can soar significantly, with an average of 22°C (72°F) and a maximum reaching up to 40°C (105°F), accompanied by low precipitation of just 4 mm (0.2 in) over 1 day, and a moderate humidity level of 55%. In stark contrast, April features cooler temperatures, ranging from a minimum of -1°C (31°F) to an average of 14°C (57°F) and a maximum of 30°C (87°F). Additionally, April is much wetter, with 83 mm (3.3 in) of precipitation spread over 6 days, resulting in higher humidity at 78%. For more details on the April weather in Sonora, you can visit Sonora weather in April.
In comparing the weather of September and May, September tends to be warmer with average temperatures reaching 22°C (72°F) and highs soaring up to 40°C (105°F). In contrast, May is cooler, with an average temperature of 17°C (63°F) and maximums around 35°C (94°F). Additionally, September experiences significantly less precipitation, averaging only 4 mm (0.2 in) over just one day, while May sees a considerable increase in rainfall at 49 mm (1.9 in) spread across five days. Humidity levels are also higher in May at 71% compared to September's 55%. For more detailed insights into May's climate, visit Sonora weather in May.
September and June present quite similar weather patterns, with average temperatures hovering around 22°C (72°F). However, September experiences slightly more extreme heat, with maximum temperatures reaching up to 40°C (105°F) compared to June's maximum of 39°C (103°F). Both months have low precipitation, with just 4 mm falling over a single day, but June's humidity is a touch higher at 64% compared to September's 55%. For a closer look at June weather specifics, you can refer to Sonora weather in June.
In comparing the weather of September and July, we see notable differences in temperature and humidity. September experiences a broader temperature range, with minimums dipping to 7°C (45°F) and maximums reaching up to 40°C (105°F), resulting in an average of 22°C (72°F). In contrast, July's temperatures are generally warmer, with a minimum of 13°C (55°F) and an average high of 39°C (103°F), making it slightly warmer at an average of 26°C (79°F). Additionally, while September records minimal precipitation of 4 mm (0.2 in) over just one day, July remains completely dry with no recorded precipitation. Humidity levels are fairly similar in both months, with September at 55% and July slightly higher at 58%. For more details on July weather, you can visit Sonora weather in July.
In comparison to August, September experiences a notable drop in minimum temperatures, starting at 7°C (45°F) compared to August's 12°C (54°F). The average temperature for September is slightly cooler at 22°C (72°F) versus 25°C (78°F) in August. Despite both months reaching a maximum of 40°C (105°F), September sees a slight increase in precipitation, with 4 mm (0.2 in) falling over just one day, whereas August remains completely dry with 0 mm of rainfall. Humidity levels are quite similar, with September at 55% and August at 54%. For a detailed look at August weather, you can visit Sonora weather in August.
September generally experiences warmer temperatures, with averages around 22°C (72°F) and occasional highs reaching 40°C (105°F). In contrast, October sees a noticeable drop in temperature, averaging 16°C (62°F) and peaking at 34°C (93°F). Additionally, October brings more precipitation, totaling 44 mm (1.7 in) over 2 days, compared to just 4 mm (0.2 in) on 1 day in September. Humidity levels also increase slightly in October, rising to 62% from September’s 55%. For more detailed information, check out Sonora weather in October.
September typically boasts warmer weather compared to November, with average temperatures reaching 22°C (72°F) and maximums peaking at 40°C (105°F). In contrast, November experiences a cooler climate with an average temperature of 11°C (52°F) and maximums around 27°C (80°F). Additionally, September enjoys low precipitation with only 4 mm (0.2 in) over just 1 day, while November sees a significant increase in rainfall, totaling 89 mm (3.5 in) across 6 days. The humidity also rises from 55% in September to 78% in November, contributing to a noticeably different feel during these months. For more details on November weather in Sonora, check out Sonora weather in November.
September weather is characterized by warm temperatures, with a minimum of 7°C (45°F), an average of 22°C (72°F), and highs reaching up to 40°C (105°F). In contrast, December brings much cooler conditions, with temperatures dropping, featuring a minimum of -2°C (28°F), an average of 8°C (46°F), and a maximum of 22°C (72°F). While September sees minimal precipitation of only 4 mm (0.2 in) over just one day, December is much wetter, receiving 148 mm (5.8 in) of rain across nine days, and the humidity also rises significantly to 80%. For a deeper look into what to expect, visit Sonora weather in December.
As summer transitions to fall, September in Sonora showcases a delightful shift in weather. With warm temperatures peaking at a cozy 40°C (105°F) and cooling down to a refreshing average of 22°C (72°F), the month offers a pleasant mix that invites outdoor activities. Unlike the rainier summer months, September typically experiences minimal precipitation, with just a single rainy day contributing to the overall dryness. This balance of warmth and low humidity, averaging around 55%, creates ideal conditions for exploring the beautiful landscapes. For a deeper understanding of what to expect throughout the year, visit Sonora Climate.