September Weather in Miami, United States

Last updated: February 24, 2025

In September, Miami experiences warm tropical weather characterized by a maximum temperature of 33°C (91°F) and a comfortable average of 28°C (82°F). Nights are mild, with temperatures dipping to a pleasant minimum of 24°C (75°F). However, this month is also marked by significant precipitation, with an average of 203 mm (8.0 in) spread over 22 rainy days, keeping humidity levels high at 76%. Visitors should be prepared for a blend of sun and showers, making it essential to embrace the vibrant, lush atmosphere that defines this lively coastal city during early autumn.

September Temperature in Miami

September in Miami marks a transition into the tail end of summer, with temperatures consistently warm and inviting. The month exhibits a minimum temperature of 24°C (75°F) and averages around 28°C (82°F), peaking at a balmy 33°C (91°F). This slight dip from the peak summer months reflects the onset of fall, yet the warmth remains comforting, making it a prime time for beachgoers and outdoor enthusiasts. With high humidity still in play, the evenings can be particularly pleasant, allowing residents and visitors alike to savor the vibrant nightlife and stunning sunsets that Miami offers. Overall, September maintains a tropical vibe that embodies the essence of this lively city, encouraging sun-soaked adventures and coastal relaxation.

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

The chart illustrates September temperature patterns in Miami, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec707373777982838382807672
Data source: Temperature data for Miami 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.

September Precipitation in Miami

In September, Miami experiences a notable peak in precipitation, with an impressive 203 mm (8.0 in) of rain accumulated over 22 days. This month marks a significant increase compared to the preceding summer months, particularly August, which recorded 181 mm (7.1 in). The rainy season reaches its zenith as tropical storms and humidity lead to frequent showers, making September one of the wetter months of the year. Following this trend, Miami’s precipitation levels gradually decline in October, where rainfall drops to 157 mm (6.2 in) over the same number of days, signaling the transition towards a drier fall season. The pattern underscores how Miami's climate is characterized by distinct wet and dry periods, profoundly influenced by late summer weather systems.

September Precipitation Trends in Miami

The chart displays monthly precipitation patterns in Miami, 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.
JanFebMarAprMayJunJulAugSepOctNovDec345031631611721741812031579341
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Miami

As September unfolds in Miami, the humidity level settles at a comfortable 76%, marking a subtle rebound from the summer's low of 69% in June. Despite being one of the hottest months, August's 72% humidity hints at a gradual increase leading into fall. This month typically signals a transition; as the year progresses, humidity levels begin to rise again, with both October and November showcasing 79% and 80%, respectively. The trend clearly illustrates Miami's knack for being humid year-round, with the winter months starting around 80%, ensuring that even as temperatures fall slightly, the air remains comfortably moist.

September Average Humidity in Miami

This chart illustrates the average monthly humidity levels in Miami, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec81%80%76%73%71%70%70%72%76%79%80%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Miami

September in Miami sees a UV Index of 11, classified as extreme, with a burn time of just 10 minutes, reflecting the lingering summer intensity. As a trend from the preceding months, the UV Index in Miami has remained predominantly very high to extreme from April through September, highlighting the city’s powerful sun exposure during this period. This is crucial for residents and visitors alike to take necessary precautions, such as wearing sunscreen and protective clothing. As the season shifts to fall, we can expect a slight dip in UV levels; however, staying informed is key. For more detailed insights on UV levels throughout the year, check out the Miami UV Index.

Maximum UV Index Levels in Miami for September

The chart shows the monthly maximum UV Index (UVI) for Miami 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.
JanFebMarAprMayJunJulAugSepOctNovDec69101212131212111086
Data source: Miami 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 Miami

In September, Miami basks in a delightful 314 hours of sunshine, making it one of the sunniest months of the year. Following a vibrant summer, where July and August shine with 344 and 340 hours respectively, September maintains a strong glow, although it begins to gradually taper off as the season transitions into fall. This month’s sunny disposition continues the trend from the previous months, showcasing a consistent pattern of abundant sunlight from April's peak of 336 hours to October’s slight decrease to 305 hours. With its warm climate and radiant skies, September offers an ideal blend of summer's lingering warmth while hinting at the cooler days ahead, inviting visitors and locals alike to revel in the golden rays before the days shorten.

Monthly Sunshine Duration in Miami: September Highlighted

The September sunshine duration represents the total number of hours Miami 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.
JanFebMarAprMayJunJulAugSepOctNovDec226h281h327h336h325h312h344h340h314h305h280h290h
Data source: Miami September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Miami During September

As summer wanes, Miami's September weather presents a mixed bag of sunshine. With only a 31% chance of sunny days, it's a noticeable dip from the cheerier months of February and October, which boast probabilities of 60% and 44% respectively. This trend reflects a broader pattern through the year, where the chances of sunny weather are highest in the colder months and persistently low during the peak of summer, particularly in June and July, which plunge to as low as 15% and 19%. While September may not shine as brightly as other months, it still offers a refreshing shift from the oppressive summer heat, hinting at the return of clearer skies as fall approaches.

Percentage of Sunny Days in September in Miami

The chart illustrates the percentage of sunny days in Miami 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 Miami experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec42%60%55%55%48%15%19%24%31%44%40%64%
Data source: Miami September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Miami in September

As summer fades into the start of autumn, September in Miami continues to bask in a generous 12 hours of daylight. This aligns with the trend seen throughout the warmer months, where daylight peaked at 13 hours from May through August, offering ample time for sun-soaked activities. As the year progresses, the days gradually shorten, dropping to 11 hours in October, hinting at the cooler months ahead. This subtle transition showcases Miami’s unique ability to maintain bright, vibrant days even as it edges toward fall, inviting residents and visitors alike to savor the last vestiges of summer warmth.

Average Daylight Hours in Miami for September

The chart illustrates the variation in daylight duration in Miami throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 43m11h 17m12h 1m12h 46m13h 23m13h 42m13h 32m12h 58m12h 15m11h 30m10h 52m10h 33m
Data source: Miami daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Miami

As September unfolds in Miami, the winds take a noticeable dip, averaging a gentle 2.4 m/s (5 mph), making it the calmest month of the year. This decline in wind speed from the preceding summer months reflects a transition towards a more serene autumn. The blustery gales of earlier months, which reached up to 4.9 m/s (11 mph) in March and February, fade into a more tranquil rhythm. The warm coastal breeze that Miami is known for continues to embrace the city, yet September’s softness hints at the approaching shift towards the breezier October, when speeds pick up again. This subtle fluctuation not only enhances the overall comfort of the city but also signals a moment of rest before the winds return with renewed vigor.

Average September Wind Speed in Miami

The chart displays monthly wind speed patterns in Miami, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.94.94.94.44.63.93.13.42.4 m/s3.54.13.4
Data source: Miami September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Miami Compares to Other Months

The weather in Miami 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 Miami and find detailed weather information for every month.

September and January showcase contrasting weather patterns. In September, temperatures are considerably warmer, with minimums around 24°C (75°F) and maximums reaching up to 33°C (91°F). The month is also characterized by high humidity at 76% and significant rainfall, averaging 203 mm (8.0 in) over 22 days. In stark contrast, January experiences much cooler temperatures, with minimums dropping to 7°C (44°F) and a comfortable average of 21°C (70°F), peaking at 28°C (83°F). Precipitation is significantly lower in January, totaling only 34 mm (1.3 in) over 6 days, and humidity increases slightly to 81%. For more details about the January weather, you can check Miami weather in January.

In September, the weather is considerably warmer with a minimum temperature of 24°C (75°F) and an average of 28°C (82°F), reaching highs of 33°C (91°F). This month also experiences significant rainfall, with 203 mm (8.0 in) spread over 22 days and humidity levels hovering around 76%. In contrast, February offers a much cooler climate, with minimum temperatures dropping to 10°C (51°F) and an average of 23°C (73°F), peaking at 28°C (83°F). Precipitation is significantly lower in February at 50 mm (2.0 in) over just 9 days, accompanied by slightly higher humidity at 79%. For more details on the weather conditions during this month, visit Miami weather in February.

September and March present striking contrasts in weather. September boasts a warmer climate with average temperatures ranging from a minimum of 24°C (75°F) to a maximum of 33°C (91°F), accompanied by significant rainfall of 203 mm (8.0 in) over 22 days, contributing to a humid atmosphere at 76%. In contrast, March offers a milder experience, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 30°C (86°F). Precipitation during this month is much lighter, totaling just 30 mm (1.2 in) over 5 days, while humidity remains constant at 76%. For a closer look at what to expect during this month, check out Miami weather in March.

When comparing the weather in September and April, significant differences emerge. September is characterized by higher temperatures, with an average of 28°C (82°F) and a maximum of 33°C (91°F), whereas April sees milder conditions with an average of 25°C (77°F) and a maximum of 32°C (90°F). Additionally, September experiences much more rainfall, totaling 203 mm (8.0 in) across 22 days, compared to April's 63 mm (2.5 in) over just 11 days. Humidity levels are relatively similar, with September at 76% and April at 73%, maintaining that tropical feel throughout both months. For more details on the weather in April, you can check out Miami weather in April.

In comparison to September, May showcases slightly milder temperatures, with a minimum of 19°C (66°F) and an average of 26°C (79°F), compared to September's minimum of 24°C (75°F) and an average of 28°C (82°F). Both months experience notable humidity, though September is a bit more humid at 76% compared to May's 71%. Additionally, September is characterized by higher precipitation levels, with 203 mm (8.0 in) over 22 days, while May sees 161 mm (6.3 in) across 18 days. For more detailed insights into Miami's weather during May, you can check out Miami weather in May.

In both September and June, temperatures are quite similar, with minimums around 24°C (75°F) and averages near 28°C (82°F). However, September tends to be slightly warmer with a maximum temperature of 33°C (91°F) compared to June's 32°C (90°F). Precipitation is notably higher in September, with 203 mm (8.0 in) over 22 days compared to June's 172 mm (6.8 in) for the same number of rainy days. Humidity levels are also higher in September at 76%, compared to 69% in June, making September feel more muggy. For a detailed look at June weather specifics, check Miami weather in June.

In comparison between September and July, both months experience similar temperature ranges, with minimums around 24°C (75-76°F) and maximums reaching 33°C (91-92°F). However, September sees a higher average humidity of 76%, compared to July's 70%. When it comes to precipitation, September is noticeably wetter, with 203 mm (8.0 in) spread over 22 days, while July has 173 mm (6.8 in) over 26 days. For more detailed insights on July's weather, visit Miami weather in July.

Comparing the weather in September and August reveals some interesting trends. While both months have similar average temperatures, September experiences slightly higher minimum and maximum temperatures, with lows around 24°C (75°F) compared to August's 25°C (76°F) and highs reaching 33°C (91°F) against August’s 32°C (90°F). However, September is notably wetter, recording 203 mm (8.0 in) of precipitation over 22 days, while August sees 181 mm (7.1 in) of rain across 25 days. Despite the increased rainfall in September, it maintains higher humidity levels at 76%, compared to August's 72%. For more detailed insights, you can check Miami weather in August.

In September, the weather tends to be warmer, with minimum temperatures reaching 24°C (75°F) and maximum temperatures peaking at 33°C (91°F). This month also experiences higher precipitation levels, totaling 203 mm (8.0 in) over 22 days, combined with a humidity level of 76%.

Conversely, October sees a noticeable drop in minimum temperatures to 15°C (59°F) while the average temperature only slightly decreases to 27°C (81°F). The maximum temperature remains relatively mild at 30°C (87°F). Precipitation totals in October are lower at 157 mm (6.2 in) over the same number of days, but humidity rises slightly to 79%. For a more detailed comparison, you can check Miami weather in October.

September typically features warmer weather, with temperatures ranging from a minimum of 24°C (75°F) to a peak of 33°C (91°F) and an average of 28°C (82°F). The month is also quite rainy, receiving significant precipitation over 22 days, totaling around 203 mm (8.0 in), while maintaining a humidity level of 76%.

In contrast, November experiences a noticeable drop in temperature, with minimums falling to 12°C (54°F) and maximums reaching 30°C (86°F), leading to a more moderate average of 24°C (76°F). Additionally, November is drier, seeing only 93 mm (3.7 in) of precipitation over 14 days and a slightly higher humidity of 80%. For more details on the climate during this month, check out Miami weather in November.

In September, the weather tends to be warm and humid, with average temperatures around 28°C (82°F) and highs reaching up to 33°C (91°F). This month also sees significant precipitation, with 203 mm (8.0 in) falling over 22 days, contributing to a humidity level of 76%. In contrast, December brings much cooler temperatures, with an average of 22°C (72°F) and maximums of 29°C (84°F). Rainfall drops dramatically to just 41 mm (1.6 in) over 9 days, though humidity slightly increases to 81%. For a more detailed look at December weather in Miami, check out Miami weather in December.

Compare Miami's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Miami

As summer begins to wind down, September in Miami presents a unique blend of warm temperatures and frequent rain. With average highs reaching around 28°C (82°F), it's notably warmer compared to the cooler months that follow. However, the month is characterized by significant humidity, often lingering around 76%, which can make the warmth feel even more intense. Despite the tropical heat, September is also one of the wettest months of the year, with around 22 days of precipitation totaling 203 mm (8.0 in), making it a stark contrast to the drier conditions experienced in winter. For those seeking to enjoy the vibrant city ambience while being prepared for brief downpours, September offers a taste of Miami's allure amidst its changing climate. For more detailed insights, check out Miami Climate.