Last updated: August 21, 2025
In September, Piracicaba, Brazil experiences a remarkable range of temperatures, reaching a scorching maximum of 39°C (102°F) while maintaining an average temperature of 24°C (75°F). Nights can be quite cool, with a minimum temperature dipping to 9°C (49°F). While the month sees 30 mm (1.2 inches) of rain spread over approximately 5 days, the overall humidity remains moderate at 54%, contributing to a dynamic and varied climate that reflects the transition into spring. Whether basking under the sun or enjoying cooler evenings, September offers a unique weather experience in this vibrant Brazilian city.
September in Piracicaba, Brazil, ushers in a transitional phase with temperatures beginning to rise after the cooler winter months. The minimum temperature settles at a comfortable 9°C (49°F), while average highs soar to a warm 39°C (102°F), reflecting the return of the heat. With an average temperature of 24°C (75°F), September offers a delightful balance, perfect for outdoor activities. This month marks a subtle shift as temperatures start inching closer to the sweltering conditions of October, making it an ideal time for residents and visitors alike to embrace the vibrant energy of the early spring season before the heat peaks in the upcoming months.
In September, Piracicaba experiences a subtle transition in its precipitation patterns, marked by a total of 30 mm (1.2 in) of rainfall over five days. This amount continues the trend of decreasing rainfall observed from the earlier months, with January's impressive 179 mm gradually tapering down. While September's precipitation remains modest compared to the wetter start of the year, it sets the stage for the upcoming rainy season, which typically peaks in October and November. The relatively low rainfall in September suggests a shift towards drier conditions as the region prepares for the vibrant bursts of rainfall characteristic of the months to follow.
In September, Piracicaba experiences a noticeable drop in humidity, reaching 54%. This decline marks a significant shift from the humid conditions of the preceding months, with levels beginning at 88% in January before gradually decreasing. The trend shows that as the year progresses into the latter months of the dry season, humidity levels consistently lower, peaking during the early part of the year before reaching their nadir in September and October. This unique climatic pattern not only influences daily life in the city but also sets the stage for a more comfortable atmosphere as spring approaches, offering residents a refreshing respite from the prior oppressive humidity.
In September, Piracicaba, Brazil, experiences a UV Index of 11, categorized as extreme, which means sun exposure can lead to skin damage in just 10 minutes. Following the trend from earlier months, the UV Index in September slightly decreases compared to the peak of 16 in January and February but remains consistent with the high values seen in March and April. After a brief dip in May and June, where the UV Index dropped to 8 and 6 respectively, September presents a reminder of the region's strong sun intensity as it transitions into spring. As you enjoy the outdoors, remember the importance of sun protection to safeguard against UV radiation. For more detailed insights, check out Piracicaba UV Index.
UV Risk Categories
As September unfolds in Piracicaba, Brazil, the region enjoys a vibrant 310 hours of sunshine, making it one of the sunniest months of the year. This delightful transition follows August's comparable 293 hours, signaling a continued trend of abundant sunlight that's been building since the earlier months. After the drier winter, which saw the lowest sunshine in June at 274 hours, the days grow longer and brighter, paving the way for a warm spring. The gradual climb in sunshine hours not only enhances the beauty of the landscape but also invigorates the spirit of the locals, as they bask in the golden rays that culminate in December's peak of 325 hours—a testament to Piracicaba's sun-kissed charm throughout the year.
In Piracicaba, Brazil, September heralds the arrival of spring, bringing a 62% chance of sunny weather that enhances the charm of the city. As the seasons transition, sunshine becomes more prevalent, rising from the relatively cool, cloudy months of winter. Notably, this month maintains a favorable likelihood for bright days, closely following August's 64%. This trend suggests a vibrant shift towards sunnier weather as Piracicaba gears up for warmer months, inviting residents and visitors alike to embrace outdoor activities and bask in the rejuvenating Brazilian sun.
In September, Piracicaba experiences a transition into the warmer months, with daylight lasting around 11 hours. This duration marks a stabilization after the gradual decline from January's 13 hours of sunlight. The trend reveals that as the year progresses, daylight hours decrease from the peak in January through the cooler months of June and July, which see only 10 hours. However, as spring approaches, daylight begins to inch upwards again, indicating a subtle yet refreshing shift towards longer days. By October, the sun once again graces the city with 12 hours of daylight, heralding the emergence of a more vibrant season ahead.
In September, Piracicaba experiences a delightful shift in its wind patterns, with an average speed of 2.9 m/s (6 mph). This consistent breeze mirrors the lighter currents seen in August, setting the stage for a gentle transition into the more dynamic winds of early October. Compared to the earlier months of the year, where winds were often more subdued, this uptick signals a refreshing change in the air, hinting at the approach of spring. The steady winds not only enhance the area's climate but also invigorate the landscape, ushering in a season ripe for growth and renewed vitality. As the months progress, residents and visitors alike can anticipate a gradual escalation in wind speeds, marking the energetic arrival of late spring.
Weather in Piracicaba varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Piracicaba, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present distinct weather patterns, highlighting the transition from the dry season to the wetter months. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average of 24°C (75°F) and relatively low humidity at 54%. In contrast, January brings warmer temperatures with a minimum of 16°C (61°F) and an average of 25°C (78°F), peaking at the same maximum of 39°C (102°F). However, January is characterized by significantly higher precipitation, totaling 179 mm (7.1 in) over 17 days, and much higher humidity at 88%. This comparison highlights the drier and less humid conditions of September compared to the wetter, more humid January climate. For more details, you can visit Piracicaba weather in January.
Comparing September and February weather reveals notable differences in temperature and precipitation. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average of 24°C (75°F). The month experiences relatively low precipitation of 30 mm (1.2 in) over just 5 days, resulting in a humidity level of 54%. In contrast, February brings warmer temperatures, with a minimum of 17°C (63°F) and a maximum of 40°C (104°F), averaging at 25°C (77°F). Additionally, February is much wetter, with 148 mm (5.8 in) of rainfall spread over 15 days, leading to a high humidity level of 87%. For more details, check out Piracicaba weather in February.
In comparing the weather between September and March, September typically has a wider temperature range with a minimum of 9°C (49°F) and a maximum reaching 39°C (102°F), averaging around 24°C (75°F). With only 30 mm (1.2 in) of precipitation over about 5 days and humidity levels at 54%, September tends to be a drier and less humid month. In contrast, March experiences slightly warmer minimum and average temperatures, with a minimum of 15°C (59°F) and an average of 25°C (78°F), while the maximum temperature is comparable at 38°C (101°F). However, March is significantly wetter, receiving 90 mm (3.5 in) of rain over 15 days, resulting in much higher humidity at 86%. For more detailed information, you can check Piracicaba weather in March.
In September, temperatures in Piracicaba range from a minimum of 9°C (49°F) to a scorching maximum of 39°C (102°F), with an average temperature of 24°C (75°F). The month sees relatively low precipitation at 30 mm (1.2 in) over 5 days, and humidity levels hover around 54%. In contrast, April brings slightly milder weather, with temperatures ranging from a minimum of 12°C (53°F) to a maximum of 34°C (94°F) and an average of 23°C (74°F). However, April is wetter, receiving 43 mm (1.7 in) of rainfall over the same number of days, and higher humidity at 82%. This comparison highlights the marked difference in weather conditions as the seasons transition. For more detailed information, you can check out Piracicaba weather in April.
September and May showcase distinct weather patterns, with September typically experiencing warmer temperatures. In September, average temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), while May has cooler averages, with temperatures ranging from 6°C (43°F) to a maximum of 34°C (94°F). Additionally, September sees slightly less precipitation at 30 mm (1.2 in) over five days, compared to May's 34 mm (1.3 in) across four days. Humidity levels also differ, with September at 54% and May significantly higher at 76%. For more insights into May's weather, check out Piracicaba weather in May.
When comparing the weather in September and June, we can see notable differences in temperature and humidity levels. September typically experiences higher temperatures, with a minimum of 9°C (49°F) and an average of 24°C (75°F), peaking at 39°C (102°F). In contrast, June has slightly cooler temperatures, with a minimum of 8°C (46°F), an average of 20°C (68°F), and a maximum of 31°C (89°F). Additionally, September has lower humidity at 54%, compared to June's 71%, which can make September feel more comfortable despite the higher temperatures. Precipitation is also more frequent in September, with 30 mm (1.2 in) over about 5 days, while June sees only 21 mm (0.8 in) over 4 days. For a more detailed understanding of June weather, you can visit Piracicaba weather in June.
When comparing the weather between September and July, it's clear that September is characterized by warmer temperatures and higher variability. In September, temperatures can reach a maximum of 39°C (102°F), with an average of 24°C (75°F) and minimums of 9°C (49°F). In contrast, July sees cooler conditions, with a maximum of only 33°C (91°F) and an average of 19°C (67°F). Moreover, September experiences more precipitation (30 mm or 1.2 inches over 5 days) compared to July, which has only 9 mm (0.3 inches) and no rainy days at all. Interestingly, July’s humidity is higher at 67%, while September’s is lower at 54%. For more detailed information on July weather, you can check Piracicaba weather in July.
September brings warmer temperatures compared to August, with minimums starting at 9°C (49°F) and average highs reaching up to 39°C (102°F), contrasted with August's minimum of 6°C (43°F) and average maximum of 35°C (96°F). Additionally, September experiences less precipitation at 30 mm (1.2 in) over five days, while August sees a higher total of 47 mm (1.8 in) during the same number of days. The humidity slightly decreases in September to 54%, while it remains higher in August at 59%. For more detailed insights on August weather, check Piracicaba weather in August.
In September, temperatures in Piracicaba range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average temperature of 24°C (75°F). The month experiences relatively low precipitation at 30 mm (1.2 in) over just 5 days, and humidity levels are around 54%. In contrast, October sees a rise in the minimum temperature to 13°C (55°F) while still maintaining the same average of 24°C (76°F). However, October is wetter, with total precipitation increasing to 87 mm (3.4 in) over 12 days, and a slight decrease in humidity to 50%. These changes indicate a transition to a more humid and rainy season. For more detailed information, you can check Piracicaba weather in October.
September and November present distinct weather characteristics. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average of 24°C (75°F). The month sees relatively low precipitation at 30 mm (1.2 in) over about 5 days, accompanied by moderate humidity at 54%. In contrast, November offers milder minimum temperatures of 12°C (54°F) and a similarly warm average of 24°C (76°F), while the maximum temperature only slightly decreases to 38°C (101°F). However, November experiences significantly higher rainfall, totaling 115 mm (4.5 in) over 12 days, leading to increased humidity levels at 74%. For a more detailed look at November's weather, check out Piracicaba weather in November.
In September, the weather is typically warm, with average temperatures around 24°C (75°F) and a maximum reaching up to 39°C (102°F). The month experiences relatively low precipitation of 30 mm (1.2 in) over approximately 5 days, along with a moderate humidity level of 54%. In contrast, December brings slightly cooler nighttime temperatures with a minimum of 14°C (58°F) and an average of 25°C (78°F). However, it sees a significant increase in rainfall, totaling 112 mm (4.4 in) over 16 days, leading to higher humidity levels at 83%. This shift indicates a more humid and wetter climate in December, making it distinct from the drier conditions of September. For more details on December weather, check out Piracicaba weather in December.
As September unfolds in Piracicaba, it brings a refreshing change in weather compared to the sweltering summer months. With an average temperature of around 24°C, this period offers a delightful balance, contrasting the extremes of highs reaching 39°C and lows dipping to 9°C. While the humidity hovers at a comfortable 54%, the relatively light rainfall, with only five wet days accumulating about 30 mm, adds a pleasant touch to the atmosphere. This variability makes September an interesting transition month, where the city feels a breath of fresh air before the next seasonal shift. For a deeper dive into what the weather is like throughout the year, check out Piracicaba Climate.