Fort Myers, Florida · field elev 30 ft
Density Altitude at Southwest Florida International (KRSW)
Southwest Florida International sits at 30 ft, and even a typical August afternoon (91 °F) only lifts density altitude to about 2,110 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 64.6 | 421 ft | 74.7 | 1,070 ft |
| February | 66.7 | 558 ft | 77.6 | 1,253 ft |
| March | 69.5 | 738 ft | 80.2 | 1,417 ft |
| April | 74.0 | 1,026 ft | 84.6 | 1,691 ft |
| May | 78.0 | 1,279 ft | 88.3 | 1,920 ft |
| June | 81.7 | 1,511 ft | 90.3 | 2,042 ft |
| July | 82.7 | 1,573 ft | 90.6 | 2,061 ft |
| August | 83.6 | 1,629 ft | 91.4 | 2,110 ft |
| September | 82.3 | 1,548 ft | 89.9 | 2,018 ft |
| October | 77.8 | 1,266 ft | 86.1 | 1,784 ft |
| November | 71.9 | 892 ft | 81.0 | 1,467 ft |
| December | 67.2 | 590 ft | 76.8 | 1,203 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for KRSW
DENSITY ALTITUDE
Field elevation 30 ft — the air behaves like 2,085 ft.
- PRESSURE ALT
- 31 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Florida fields
- KFMY — Page Field
Fort Myers · elev 17 ft
- KIMM — Immokalee Regional
Immokalee · elev 37 ft
- X14 — La Belle Municipal
La Belle · elev 20 ft
- KAPF — Naples Municipal
Naples · elev 8 ft
- KPGD — Punta Gorda
Punta Gorda · elev 26 ft
- F13 — Shell Creek Airpark
Punta Gorda · elev 20 ft
- KMKY — Marco Island Exec
Marco Island · elev 5 ft
- 2IS — Airglades
Clewiston · elev 20 ft
Frequently asked questions
How high does density altitude get at KRSW in summer?
On a typical August afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Southwest Florida International reaches roughly 2,110 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at KRSW on an average day?
It swings with the seasons: from roughly 421 ft at the coldest month's average temperature to about 1,629 ft at the warmest month's — all from a constant field elevation of 30 ft. The month-by-month table above carries the full year.
What is the field elevation of Southwest Florida International?
30 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KRSW (ICAO) / RSW (FAA), in Fort Myers, Florida.