West Palm Beach Air Quality in September
Across 2019–2025, West Palm Beach'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%
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How is the air in West Palm Beach 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 West Palm Beach in September?▾
Across 2019–2025, the median daily AQI in West Palm Beach 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 West Palm Beach?▾
A typical September day in West Palm Beach 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 West Palm Beach's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 76.6% of September days in West Palm Beach. The highest September AQI recorded in 2019–2025 was 87 (Moderate), in 2019.
West Palm Beach September air quality, year by year
West Palm Beach 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 West Palm Beach
A typical September day in West Palm Beach 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 West Palm Beach'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 West Palm Beach 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 West Palm Beach's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in West Palm Beach
The latest EPA AirNow observation puts West Palm Beach's AQI at 28 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current West Palm Beach 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.