Miami Air Quality in September
Across 2019–2025, Miami's September air quality had a median AQI of 43 (Good) over 209 monitored days in the Miami-Fort Lauderdale-West Palm Beach, FL area. 0.0% of September days (0 of 209) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 76.6% of days. The cleanest September on record here was 2024 (median AQI 36, 0 days above 100) and the worst was 2019 (median 52, 0 days above 100, peak AQI 60).
- Good: 68.9%
- Moderate: 31.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Miami Homes
Air quality in Miami is moderate (AQI 54), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Miami in September?
Good on a typical day: median AQI 43 across 2019–2025, with 0.0% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓68.9% of September days were Good (AQI 0–50), 31.1% Moderate (51–100).
- ✓0 days of 209 reached AQI 101+; the September peak was 87.
- ✓Best September: 2024; worst September: 2019.
Frequently asked questions
What is the air quality like in Miami in September?▾
Across 2019–2025, the median daily AQI in Miami in September was 43 (Good). 68.9% of days were Good, 31.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 209 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Miami?▾
A typical September day in Miami sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
Which pollutant causes Miami's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 76.6% of September days in Miami. The highest September AQI recorded in 2019–2025 was 87 (Moderate), in 2019.
Miami September air quality, year by year
Miami September air quality by year (Miami-Fort Lauderdale-West Palm Beach, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 29 | 52 | 0 | 60 | PM2.5 |
| 2020 | 30 | 45 | 0 | 87 | PM2.5 |
| 2021 | 30 | 45 | 0 | 83 | PM2.5 |
| 2022 | 30 | 43 | 0 | 84 | PM2.5 |
| 2023 | 30 | 45 | 0 | 59 | PM2.5 |
| 2024cleanest | 30 | 36 | 0 | 60 | PM2.5 |
| 2025 | 30 | 38 | 0 | 61 | PM2.5 |
What September air means in Miami
A typical September day in Miami sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
September's median AQI of 43 is below Miami's whole-year median of 51, making it one of the area's cleaner periods. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Miami runs in line with the national September norm; 0.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Miami's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Miami
The latest EPA AirNow observation puts Miami's AQI at 54 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Miami air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Miami-Fort Lauderdale-West Palm Beach, FL), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.