September Weather in Chillan, Chile

Last updated: August 21, 2025

In Chillan, Chile, the weather in September showcases a transition into spring, characterized by a diverse range of temperatures. Daily highs can reach a maximum of 26°C (79°F), providing warm afternoons, while nights may cool down to a brisk minimum of -1°C (31°F). The average temperature settles comfortably at 11°C (52°F), making it a pleasant time to explore the region. Rainfall is modest, with an average precipitation of 85 mm (3.3 in) spread across 6 days, adding a refreshing touch to the landscape. Meanwhile, humidity levels hover around 68%, contributing to the lush surroundings typical of this vibrant season.

September Temperature in Chillan

In September, Chillán experiences a gentle transition from the crispness of winter to the budding warmth of spring. With temperatures ranging from a low of -1°C (31°F) to a comfortable high of 26°C (79°F), this month offers a delightful average of 11°C (52°F). As the chill gradually recedes, locals and visitors alike can enjoy more mild days, perfect for outdoor activities amidst the blooming flora. The shift is evident as temperatures begin to rise compared to the preceding months, particularly August when highs were only 21°C (71°F). This warming trend signals the promise of brighter, sunnier days ahead, inviting everyone to relish the seasonal changes in this beautiful Chilean region.

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

The chart illustrates September temperature patterns in Chillan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chillan, September typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec686863575148474852556166
Data source: Temperature data for Chillan 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 Chillan

In September, Chillán, Chile, experiences a notable shift in its precipitation patterns, receiving 85 mm (3.3 inches) of rain over 6 days—a significant decline from the intense downpours found in the preceding winter months. This marks a transition from the peak rainfall of June and July, which each saw over 130 mm, culminating in a wetter season that usually peaks in May and June. As spring begins, the rainfall subsides, yet September still holds its own among the wetter months, bridging the gap between the heavy precipitation of winter and the drier late spring and summer months ahead. This gradual decrease not only sets the stage for the upcoming warmer weather but also illustrates the dynamic climate trends in this region.

September Precipitation Trends in Chillan

The chart displays monthly precipitation patterns in Chillan, 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. In Chillan, September typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec20919461312561351538568297
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chillan

In September, Chillán, Chile, experiences a notable decrease in humidity at 68%, marking a shift from the peak of winter. Following the high humidity of the previous months, which peaked at 85% in July, September's levels indicate a gradual transition towards the drier conditions of spring. This slight decline is part of a broader trend observed throughout the year, where humidity generally rises from the 41% in summer to a maximum in mid-winter, before tapering off again. As the seasons change, residents and visitors alike can enjoy the refreshing air while still embracing the lingering moisture from winter.

September Average Humidity in Chillan

This chart illustrates the average monthly humidity levels in Chillan, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Chillan is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec41%41%48%60%79%83%86%83%68%64%49%42%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chillan

In September, Chillán experiences a UV Index of 7, placing it in the high exposure category with a recommended burn time of 25 minutes. This marks a transition from the more moderate indices of winter months, as the UV radiation begins to increase with the arrival of spring. Comparatively, September's levels are lower than the extremes felt in January and February but mirror those of the transitional months of April and October. As the days grow longer and warmer, it’s essential for residents and visitors alike to stay vigilant about sun protection. For more detailed information, you can check the Chillan UV Index.

Maximum UV Index Levels in Chillan for September

The chart shows the monthly maximum UV Index (UVI) for Chillan 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. In September, the maximum UV index in Chillan typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141310753457101314
Data source: Chillan 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 Chillan

In September, Chillán, Chile, begins to embrace the transition from winter's chill to the warmth of spring, showcasing 283 hours of bright sunshine. This marks a noticeable uptick from the previous winter months, reflecting a gradual increase in daylight as the region shakes off the colder seasons. Following the peak of January and February, which boast over 300 hours of sunshine, September serves as a bridge to the vibrant embrace of October and November, where sunshine hours soar even higher, reaching 337 and 373 hours, respectively. This trend highlights a pattern of increasing sunlight as the year progresses, making September an inviting prelude to the abundant warmth and light that characterizes the latter part of the year.

Monthly Sunshine Duration in Chillan: September Highlighted

The September sunshine duration represents the total number of hours Chillan 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.
JanFebMarAprMayJunJulAugSepOctNovDec321h344h354h294h232h172h213h240h283h337h373h396h
Data source: Chillan September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chillan During September

September in Chillán, Chile, sees a promising 60% chance of sunny weather, marking a transition towards brighter days as winter recedes. This month shows a slight uptick from the cool, overcast conditions of winter, with July at 61% and August at 45%. As the season shifts, the likelihood of sunshine begins to mirror the sunnier months ahead, such as October and November, which enjoy 72% and 77% chances, respectively. This gradual increase underscores September as a delightful time to embrace the emerging warmth, offering opportunities to enjoy the beautiful landscapes of Chillán under the sun.

Percentage of Sunny Days in September in Chillan

The chart illustrates the percentage of sunny days in Chillan 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 Chillan experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec78%72%74%65%44%34%61%45%60%72%77%82%
Data source: Chillan September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chillan in September

In Chillan, Chile, the September daylight duration marks a gentle transition as the days begin to lengthen once again, offering approximately 11 hours of daylight. Following the shorter days of winter, September sees a rebound in sunlight, a precursor to the longer days of spring. This trend continues into October, where daylight extends to 13 hours, and peaks at 14 hours by November and December. The rhythm of daylight reflects the seasonal shifts, with autumn ushering in gradually increasing light, enriching the landscape and inviting outdoor adventures as the year unfolds.

Average Daylight Hours in Chillan for September

The chart illustrates the variation in daylight duration in Chillan throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec14h 18m13h 23m12h 15m11h 6m10h 9m9h 41m9h 56m10h 47m11h 52m13h 2m14h 3m14h 35m
Data source: Chillan daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Chillan

As September rolls into Chillan, Chile, the winds whisper a gentle change, averaging 3.0 m/s (7 mph). This transition marks a subtle decrease from the previous month but remains consistent with the strength seen in late winter. Throughout the year, wind speeds have gradually increased from a calm 2.4 m/s (5 mph) in February, peaking in October where the winds can reach 3.8 m/s (8 mph). September, with its delicate balance of breezy invitations, hints at the approach of warmer days, making it a perfect time to embrace the invigorating air that heralds the arrival of spring.

Average September Wind Speed in Chillan

The chart displays monthly wind speed patterns in Chillan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.52.42.62.72.72.93.13.23.0 m/s3.83.53.2
Data source: Chillan September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Chillan Compares to Other Months

Weather in Chillan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Chillan, focusing on differences in temperature, rainfall, humidity, and UV levels.

September and January exhibit significantly different weather patterns, reflecting the transition from late winter to mid-summer in Chillán. In September, temperatures range from a chilly minimum of -1°C (31°F) to a comfortable maximum of 26°C (79°F), with an average of 11°C (52°F). This month is marked by higher humidity at 68% and considerable precipitation, totaling 85 mm (3.3 in) over approximately six days. In contrast, January boasts significantly warmer temperatures, with a minimum of 6°C (43°F) and a scorching maximum of 38°C (101°F), averaging 20°C (68°F). The month is much drier, with only 20 mm (0.8 in) of precipitation occurring on just one day and lower humidity at 41%. For a more detailed look at January weather, check out Chillan weather in January.

September and February present contrasting weather conditions. In September, temperatures can range from a chilly minimum of -1°C (31°F) to a comfortable maximum of 26°C (79°F), with an average of 11°C (52°F). The month sees relatively high precipitation at 85 mm (3.3 in) over six days, coupled with a humidity level of 68%. In stark contrast, February boasts much warmer temperatures, starting with a minimum of 8°C (47°F) and soaring to a maximum of 36°C (97°F), averaging around 20°C (68°F). The month is also significantly drier, recording only 9 mm (0.4 in) of precipitation over just two days, with lower humidity at 41%. For a detailed look at February weather specifics, you can visit Chillan weather in February.

September and March present notable differences in weather patterns. In September, temperatures range from a chilly minimum of -1°C (31°F) to a comfortable maximum of 26°C (79°F), with an average of 11°C (52°F). This month experiences around 85 mm (3.3 in) of precipitation over 6 days, contributing to a higher humidity level of 68%. In contrast, March enjoys milder temperatures, with a minimum of 4°C (40°F) and a maximum of 33°C (91°F), averaging 17°C (63°F). Precipitation drops significantly to just 19 mm (0.7 in) over only 2 days, and humidity levels are more comfortable at 48%. For a detailed look at March weather in Chillan, you can visit Chillan weather in March.

In September, temperatures can drop to a chilly minimum of -1°C (31°F), with an average of 11°C (52°F) and a maximum of 26°C (79°F). The month experiences more precipitation, totaling 85 mm (3.3 in) over about six days, along with a higher humidity level of 68%. In contrast, April is milder, featuring minimum temperatures of 3°C (37°F) and an average of 14°C (57°F), peaking at 28°C (83°F). Precipitation is less frequent, with only 46 mm (1.8 in) across four days, and humidity is slightly lower at 60%. For more details on the April weather, you can visit Chillan weather in April.

September and May present contrasting weather patterns. In September, temperatures range from a minimum of -1°C (31°F) to a maximum of 26°C (79°F), with an average of 11°C (52°F) and humidity around 68%. The month sees approximately 85 mm (3.3 in) of precipitation over 6 days. In comparison, May is slightly cooler, with temperatures varying from a minimum of -4°C (26°F) to a maximum of 23°C (73°F), averaging 10°C (51°F). The precipitation increases to 131 mm (5.2 in) over 8 days, and the humidity rises to 79%. For more detailed insights on the weather during this time, check out Chillan weather in May.

The weather in September demonstrates a notable shift compared to June, with September averaging a milder temperature of 11°C (52°F), while June sees a lower average of 9°C (48°F). September also enjoys higher maximum temperatures, reaching up to 26°C (79°F) compared to June's peak of 19°C (66°F). However, this warmer September weather comes with less precipitation, totaling 85 mm (3.3 in) over just 6 days, in stark contrast to June's significantly higher rainfall of 256 mm (10.1 in) across 13 days. Humidity levels are slightly lower in September at 68%, compared to June's 82%. For a more detailed look at June weather, you can visit Chillan weather in June.

In comparing the weather between September and July, September showcases a broader temperature range with a minimum of -1°C (31°F), an average of 11°C (52°F), and a maximum of 26°C (79°F). This is a notable improvement from July's temperatures, which range from a minimum of -4°C (25°F) to a maximum of 19°C (67°F), averaging 8°C (47°F). Additionally, September experiences less precipitation, totaling 85 mm (3.3 in) over 6 days, compared to July's higher rainfall of 135 mm (5.3 in) over 10 days. Furthermore, September's humidity at 68% is more comfortable than July's 85%. For a closer look at July weather specifics, you can visit Chillan weather in July.

September generally brings milder temperatures compared to August, with average highs reaching 26°C (79°F) versus August’s peak of 21°C (71°F). While both months experience chilly minimum temperatures, September is slightly warmer at a low of -1°C (31°F) compared to August’s -2°C (29°F). Precipitation is less frequent in September, with only 85 mm (3.3 in) over 6 days, compared to August’s 153 mm (6.0 in) accumulated over 11 days. Additionally, humidity levels decrease in September, averaging 68% compared to August’s higher 83%. For a more detailed look at August weather, you can visit Chillan weather in August.

September and October showcase a transition in weather characteristics. September experiences a broader temperature range, with minimums dipping to -1°C (31°F) and maximums peaking at 26°C (79°F), while the average temperature rests at 11°C (52°F). This month also sees a higher precipitation level of 85 mm (3.3 in) over 6 days, coupled with a humidity of 68%.

In contrast, October presents milder conditions, with averages climbing to 13°C (55°F) and maximum temperatures reaching 28°C (82°F). Although October experiences a slight decrease in total precipitation to 68 mm (2.7 in) over 7 days, the humidity drops to 64%. For those interested in a detailed look at October's weather, you can find more information in the link: Chillan weather in October.

In September, the weather features a broader temperature range, with minimums dipping to -1°C (31°F) and maximums reaching a warm 26°C (79°F). This month receives about 85 mm (3.3 in) of precipitation over 6 days, making it relatively damp with a humidity level of 68%. In contrast, November sees milder temperatures, with a minimum of 5°C (41°F) and maximums climbing to a balmy 30°C (86°F). Precipitation is significantly lower at 29 mm (1.2 in) over just 3 days, resulting in a drier, more comfortable atmosphere with humidity dropping to 49%. For more detailed information, you can explore Chillan weather in November.

In September, temperatures in Chillan range from a chilly minimum of -1°C (31°F) to a pleasant maximum of 26°C (79°F), with an average of 11°C (52°F). The month sees considerable precipitation, totaling 85 mm (3.3 in) over approximately 6 days, and the humidity levels are relatively high at 68%. In contrast, December offers a warmer climate with minimum temperatures around 7°C (44°F) and maximums reaching 33°C (92°F), averaging 19°C (66°F). The weather is significantly drier, with only 7 mm (0.3 in) of rain over just 2 days and lower humidity at 42%. For more details, you can check Chillan weather in December.

Compare Chillan's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Chillan

As September unfolds in Chillán, it brings a unique transition from the colder winter months to the mild embrace of spring. With an average temperature nestled around 11°C, the weather showcases a blend of warm days peaking at 26°C and cooler nights that can dip to -1°C. This month stands out not only for its fluctuating temperatures but also for its relatively low precipitation, with just 85 mm expected over about 6 days. The air is slightly more humid at 68%, adding a touch of crispness to the spring air. September truly marks a refreshing shift in Chillán's climate, making it an exciting time to experience the blossoming landscape. For a deeper dive into the seasonal patterns, check out Chillan Climate.