Miami Weather in September
United States · Tropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Miami sees average temperatures ranging from a low of 24.8°C (76.6°F) to a high of 30.3°C (86.5°F), with a mean of 27.3°C (81.1°F). Compared to the annual average of 24.9°C (76.8°F), this month is 2.4°C warmer than the yearly norm. Precipitation averages 231.0mm, making it approximately 92.0mm wetter than the monthly average of 139.0mm. The city receives an average of 9.7 hours of sunshine per day during September, with relative humidity averaging 81.0%. Wind speeds reach an average maximum of 17.4 km/h. For travelers, this month offers a temperature experience in Miami, with wetter-than-average conditions compared to the rest of the year.
Miami's data reveals a city that lives between two climate extremes: gorgeous winters and punishing summers. January averages 20°C with 50mm of rain — practically perfect. August averages 29°C with 200mm and 80% humidity. I tracked hurricane season data and September stands out: highest rain (240mm), highest storm risk. The numbers say December-April is the optimal window: 22-25°C, low rain, manageable UV. May-June is statistically underrated — 27°C before peak humidity. July-August is for AC-to-AC dashes. The water stays bathtub-warm 8 months a year, which the data confirms.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 28.4°C (83.1°F) | 27.3°C (81.1°F) | 25.9°C (78.6°F) |
| Rainfall | 145.1mm | 231.0mm | 162.2mm |
| Sunshine | 11.2 hrs | 9.7 hrs | 9.4 hrs |
| Humidity | 77.4% | 81.0% | 77.5% |
| Wind | 18.4 km/h | 17.4 km/h | 20.1 km/h |
| Rainy Days | 30.0 | 27.8 | 26.4 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Miami in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Miami in September?
The average temperature in Miami during September ranges from 24.8°C (76.6°F) to 30.3°C (86.5°F), with a mean of 27.3°C (81.1°F).
How much does it rain in Miami in September?
Miami receives an average of 231.0mm of precipitation in September, spread across approximately 27.8 rainy days.
What should I pack for Miami in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 231.0mm of precipitation.
Is September a good time to visit Miami?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Miami
Cities with Similar September Climate (Tropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 25.76°, -80.19°. Timezone: America/New_York. Last updated: 2026-07-30.