Florida Keys Marathon International Airport (KMTH) Aviation Weather, METAR, TAF & ATIS Alerts
Live aviation weather for Florida Keys Marathon International Airport in Marathon, FL, including METAR, TAF, flight category, wind, visibility, ceiling, altimeter, runway crosswinds, and Telegram airport alerts.
Florida Keys Marathon International Airport (KMTH) is a regional airport serving Marathon, FL at 5 ft. KMTH reports its own METAR and publishes a TAF, decoded live on this page as flight category, wind, visibility, ceiling and altimeter. Its 2 runways (07, 25), longest 5,008 ft, are checked against the current wind in the crosswind table below. The official FAA airport diagram is at the bottom of the page. Track KMTH in the ATIS Alerts Telegram bot to get a message when a new METAR changes the picture: flight category, wind, or ceiling past your selected minimums.
Wind calm, visibility 10+ statute miles, no cloud data, temperature 29°C (85°F), altimeter 30.01 inHg. Conditions are Visual Flight Rules (VFR).
METAR KMTH 122353Z AUTO 00000KT 10SM CLR 29/24 A3001 RMK AO2 LTG DSNT E AND SE SLP163 T02940239 10328 20289 53001
What changed at KMTH?
Since the 2253Z (6:53 PM EDT) report, compared automatically against the latest METAR.
No significant changes since the 2253Z report, conditions are holding steady.
This is exactly what ATIS Alerts watches for you: get a Telegram message when KMTH's weather changes, free →
Current pilot readout for KMTH
KMTH is currently VFR with calm winds, visibility 10+ statute miles, and no ceiling reported. Density altitude is approximately 1,600 ft (field elevation 5 ft). Review the latest TAF below for forecast changes before departure.
⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →
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Runway wind check
Estimated head/tailwind and crosswind for each runway end from the current reported wind.
Use this section to quickly compare current wind alignment across available runways at KMTH. This is intended as a planning aid only and should not replace official performance calculations or pilot judgment.
Current wind is calm: calm wind is not a factor for runway selection, and with no wind there is no head/tail or crosswind component to compute. Live numbers return automatically once a report includes a wind direction.
| Runway | Length | Surface | Head / Tail | Crosswind |
|---|---|---|---|---|
| 07 | 5,008 ft | ASP | - | - |
| 25 | 5,008 ft | ASP | - | - |
Open the crosswind calculator to try your own wind and runway numbers →
24-hour trend
Wind, ceiling and flight category over the last 24 hours.
Over the last 22 h: wind 5→0 kt, ceiling unlimited → unlimited.
KMTH weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.
Live weather radar around Florida Keys Marathon International Airport in Marathon, FL: the NOAA/NWS NEXRAD composite updates about every five minutes, with NOAA lightning strike density overlaid. The loop plays the past 50 minutes, then continues into a future-radar forecast (+1 to +4 hours, NOAA HRRR model) so you can see where precipitation around KMTH is headed.
Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap
Forecast frames (amber label) are HRRR model guidance, not observed radar. Lightning strike density appears as a blue-white glow when strikes are detected in view. Radar and lightning coverage are limited in parts of Alaska, Hawaii, and offshore areas. Not for navigation.
Pilot reports (PIREPs) within 100 NM of KMTH
Reported by pilots in flight over the past 6 hours, via aviationweather.gov.
Show raw report
OPF UA /OV KOPF/TM 0038/FLDURD/TP A321/WX VMC/RM SMOOTH
OPF UAHeader: reporting station and UA: a routine pilot report.OV KOPFLocation: fix or navaid, optionally with a radial and distance in NM.TM 0038Reported at 00:38 UTC.FLDURDReported during descent.TP A321Aircraft type reporting.WX VMCWeather and flight visibility observed.RM SMOOTHRemarks.Show raw report
MIA UA /OV MIA140030/TM 0022/FL060/TP A320/SK SKC/RM SMOOTH
MIA UAHeader: reporting station and UA: a routine pilot report.OV MIA140030Location: fix or navaid, optionally with a radial and distance in NM.TM 0022Reported at 00:22 UTC.FL060Altitude: 6,000 ft MSL.TP A320Aircraft type reporting.SK SKCSky condition: cloud bases and tops in hundreds of feet MSL.RM SMOOTHRemarks.Show raw report
PBI UA /OV PBI230040/TM 0017/FL100/TP A319/TB OCNL LGT
PBI UAHeader: reporting station and UA: a routine pilot report.OV PBI230040Location: fix or navaid, optionally with a radial and distance in NM.TM 0017Reported at 00:17 UTC.FL100Altitude: 10,000 ft MSL.TP A319Aircraft type reporting.TB OCNL LGTTurbulence: occasional light.Show raw report
MIA UA /OV MIA130030/TM 0014/FL190/TP A320/TB NEG
MIA UAHeader: reporting station and UA: a routine pilot report.OV MIA130030Location: fix or navaid, optionally with a radial and distance in NM.TM 0014Reported at 00:14 UTC.FL190Altitude: 19,000 ft MSL.TP A320Aircraft type reporting.TB NEGTurbulence: none reported.Show raw report
MIA UA /OV ZBV230035/TM 2339/FL120/TP B772/TB LGT CHOP 120
MIA UAHeader: reporting station and UA: a routine pilot report.OV ZBV230035Location: fix or navaid, optionally with a radial and distance in NM.TM 2339Reported at 23:39 UTC.FL120Altitude: 12,000 ft MSL.TP B772Aircraft type reporting.TB LGT CHOP 120Turbulence: light chop 120.Show raw report
RSW UA /OV RSW127038/TM 2324/FL130/TP A321/TB CONS LGT/RM DURD
RSW UAHeader: reporting station and UA: a routine pilot report.OV RSW127038Location: fix or navaid, optionally with a radial and distance in NM.TM 2324Reported at 23:24 UTC.FL130Altitude: 13,000 ft MSL.TP A321Aircraft type reporting.TB CONS LGTTurbulence: continuous light.RM DURDRemarks.Show raw report
OPF UA /OV OPF273010/TM 2321/FL016/TP E545/TB SMOOTH
OPF UAHeader: reporting station and UA: a routine pilot report.OV OPF273010Location: fix or navaid, optionally with a radial and distance in NM.TM 2321Reported at 23:21 UTC.FL016Altitude: 1,600 ft MSL.TP E545Aircraft type reporting.TB SMOOTHTurbulence: smooth.Show raw report
OPF UA /OV OPF/TM 2232/FL005/TP CL35/SK CLR/TB SMOOTH
OPF UAHeader: reporting station and UA: a routine pilot report.OV OPFLocation: fix or navaid, optionally with a radial and distance in NM.TM 2232Reported at 22:32 UTC.FL005Altitude: 500 ft MSL.TP CL35Aircraft type reporting.SK CLRSky condition: cloud bases and tops in hundreds of feet MSL.TB SMOOTHTurbulence: smooth.⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.
Recent aviation weather trends at KMTH
From ATIS Alerts' hourly weather history.
Over the past 24 hours, KMTH reported mostly VFR across 38 observations, with 14 flight-category changes. The lowest ceiling was 1,900 ft. Wind most often came from the SE.
Most recent change: MVFR → VFR
Most recent change: MVFR → VFR
- 07
- 87%
- 25
- 13%
TAF | Terminal Aerodrome Forecast
Issued 2324Z (7:24 PM EDT)
TAF KMTH 122324Z 1300/1324 16007KT P6SM VCSH FEW020 FM130300 13005KT P6SM FEW025 FM131400 17005KT P6SM VCSH SCT025
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Airport facts
Reference data from the OurAirports dataset.
- Type
- Regional airport
- ICAO
- KMTH
- IATA
- MTH
- FAA LID
- MTH
- City
- Marathon
- State
- Florida
- Country
- United States
- Elevation
- 5 ft
- Coordinates
- 24.7260, -81.0514
- Runways
- 2
- Longest runway
- 5,008 ft
- Weather reporting
- Reports METAR
- TAF
- Published
- AWOS/ASOS
- 135.525 MHz
- Time zone
- America/New_York
- Next sunset
- 22h 37m
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Nearby airports
Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.
Within 25 NM
2 airports25–50 NM
6 airports50–100 NM
8 airports+2 more within 100 NM
Historical Flying Weather at KMTH
2006–2025 · ATIS Alerts Flying Weather Index
Based on historical observations from 2006–2025, KMTH reported VFR conditions during about 93.6% of valid daylight observations, with an estimated 294 VFR flying days a year. April had the most VFR weather; January had the most instrument conditions. Surface winds averaged 7.0 kt, calm 7.0% of the time.
Full historical breakdown
Flight category by month
| Month | VFR % | MVFR % | IFR % | LIFR % |
|---|---|---|---|---|
| Jan | 90.5 | 7.0 | 1.9 | 0.7 |
| Feb | 92.5 | 6.2 | 0.9 | 0.4 |
| Mar | 95.1 | 4.5 | 0.3 | 0.0 |
| Apr | 95.4 | 4.2 | 0.3 | 0.1 |
| May | 93.9 | 5.3 | 0.7 | 0.1 |
| Jun | 94.1 | 5.3 | 0.6 | 0.1 |
| Jul | 95.4 | 4.0 | 0.5 | 0.2 |
| Aug | 95.2 | 4.0 | 0.6 | 0.2 |
| Sep | 94.5 | 4.7 | 0.7 | 0.1 |
| Oct | 93.9 | 5.2 | 0.8 | 0.1 |
| Nov | 94.6 | 4.7 | 0.6 | 0.1 |
| Dec | 92.8 | 5.8 | 1.2 | 0.2 |
Average wind by month
| Month | Mean wind (kt) |
|---|---|
| Jan | 7.6 kt |
| Feb | 7.3 kt |
| Mar | 7.9 kt |
| Apr | 7.8 kt |
| May | 6.9 kt |
| Jun | 6.0 kt |
| Jul | 5.5 kt |
| Aug | 5.7 kt |
| Sep | 5.7 kt |
| Oct | 7.7 kt |
| Nov | 8.1 kt |
| Dec | 7.5 kt |
Historical summary of past observations: not a forecast or safety rating. Always check the current METAR, TAF, and a weather briefing before flight.
KMTH airport diagram
Official FAA taxiway and runway layout. Tap to zoom.
The FAA airport diagram for Florida Keys Marathon International Airport in Marathon, FL shows the runway and taxiway layout across 2 runways, ramp areas, and hold-short positions. Review it before taxiing at an unfamiliar field.
Official FAA airport diagram · d-TPP cycle 2610 · Not for navigation. Download the official FAA PDF ↗
KMTH weather: frequently asked
What runways are available at KMTH?+
KMTH has 2 runways: 07, 25; the longest is 5,008 ft. This page computes the live crosswind for each runway end from the current wind.
Does KMTH report its own weather?+
Yes. Florida Keys Marathon International Airport has its own weather station and publishes METAR observations, which this page decodes live.
Does KMTH have a TAF?+
Yes. The TAF is shown on this page below the current conditions.
Does KMTH broadcast D-ATIS?+
No. KMTH does not broadcast D-ATIS. Alerts for KMTH from the ATIS Alerts bot (@atisalerts_bot) are based on its METAR instead.
Where can I find the KMTH airport diagram?+
The official FAA airport diagram for Florida Keys Marathon International Airport (KMTH) is shown on this page. It maps the runway and taxiway layout, ramps, and hold-short lines. Tap it to zoom, or download the official FAA PDF free from the link under the diagram (updated every 28-day FAA charting cycle).
Pilot PIREPs for Florida Keys Marathon International Airport (KMTH)
Community-submittedCommunity-submitted airport notes from pilots about runway conditions, wildlife, FBOs, fuel, turbulence, ramp access, and local tips.
Read recent community-submitted pilot notes for Florida Keys Marathon International Airport, including runway conditions, wildlife activity, FBO/fuel notes, turbulence, ramp access, and local airport tips.
⚠️ Pilot PIREPs on ATIS Alerts are community-submitted airport notes for situational awareness only. They are not official FAA PIREPs, NOTAMs, weather briefings, airport advisories, or flight-planning guidance. Always verify with official FAA/NWS sources, airport management, ATC, and current publications.
No Pilot PIREPs have been submitted for KMTH yet. Recently flew here? Help the next pilot by leaving a quick airport note.
Pilot PIREPs are community pilot notes for situational awareness only, not official FAA PIREPs or advisories. Verify with official sources. Notes are moderated before they appear; helpful marks and reports help us keep them useful.
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⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
No D-ATIS at this airport, showing METAR.
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