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.

VFR

Observed 0153Z (9:53 PM EDT)live · refreshes every 60s

Wind

270° 5 kt

Visibility

10+ sm

Ceiling

Unlimited

Altimeter

29.94"

Temp / Dew

29°C / 85°F

dew 24°C

Wind from the west (270°) at 5 kt, visibility 10+ statute miles, no cloud data, temperature 29°C (85°F), altimeter 29.94 inHg. Conditions are Visual Flight Rules (VFR).

Raw METAR

METAR KMTH 290153Z AUTO 27005KT 10SM CLR 29/24 A2994 RMK AO2 SLP138 T02940244

What changed at KMTH?

Since the 0053Z (8:53 PM EDT) report — compared automatically against the latest METAR.

No significant changes since the 0053Z 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 winds from 270° at 5 knots, visibility 10+ statute miles, and no ceiling reported. The strongest crosswind component is currently on runway 07, about 2 knots. Density altitude is approximately 1,700 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.

Runway	Length	Surface	Head / Tail	Crosswind
25FAV	5,008 ft	ASP	5 kt head	2 kt right
07	5,008 ft	ASP	5 kt tail	2 kt left

Open the crosswind calculator — try your own wind and runway numbers →

24-hour trend

Wind, ceiling and flight category over the last 24 hours.

Wind (kt)Gusts (kt)Bottom strip — flight category:VFRMVFRIFRLIFRNo report

Over the last 23 h: wind 0→5 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.

Loading…

Loading radar…

Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © OpenStreetMap © CARTO

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.

PIREP0120Z (9:20 PM EDT) · 98 NM NE of KMTH · 1,900 ft MSL · C172

Show raw report

FXE UA /OV FXE270005/TM 0120/FL019/TP C172/SK SKC

FXE UAHeader — reporting station and UA: a routine pilot report.

OV FXE270005Location — fix or navaid, optionally with a radial and distance in NM.

TM 0120Reported at 01:20 UTC.

FL019Altitude: 1,900 ft MSL.

TP C172Aircraft type reporting.

SK SKCSky condition — cloud bases and tops in hundreds of feet MSL.

PIREP0110Z (9:10 PM EDT) · 16 NM S of KMTH · 23,000 ft MSL · B38M

occasional light chop turbulence

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EYW UA /OV EYW100040/TM 0110/FL230/TP B38M/TB OCNL LGT CHOP

EYW UAHeader — reporting station and UA: a routine pilot report.

OV EYW100040Location — fix or navaid, optionally with a radial and distance in NM.

TM 0110Reported at 01:10 UTC.

FL230Altitude: 23,000 ft MSL.

TP B38MAircraft type reporting.

TB OCNL LGT CHOPTurbulence: occasional light chop.

PIREP0050Z (8:50 PM EDT) · 98 NM NE of KMTH · 1,500 ft MSL · A320

smooth turbulence

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FLL UA /OV FLL090006/TM 0050/FL015/TP A320/SK CLR/TB SMOOTH

FLL UAHeader — reporting station and UA: a routine pilot report.

OV FLL090006Location — fix or navaid, optionally with a radial and distance in NM.

TM 0050Reported at 00:50 UTC.

FL015Altitude: 1,500 ft MSL.

TP A320Aircraft type reporting.

SK CLRSky condition — cloud bases and tops in hundreds of feet MSL.

TB SMOOTHTurbulence: smooth.

PIREP0015Z (8:15 PM EDT) · 98 NM NE of KMTH · 1,500 ft MSL · CL60

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FXE UA /OV FXE270005/TM 0015/FL015/TP CL60/SK SKC

FXE UAHeader — reporting station and UA: a routine pilot report.

OV FXE270005Location — fix or navaid, optionally with a radial and distance in NM.

TM 0015Reported at 00:15 UTC.

FL015Altitude: 1,500 ft MSL.

TP CL60Aircraft type reporting.

SK SKCSky condition — cloud bases and tops in hundreds of feet MSL.

PIREP2314Z (7:14 PM EDT) · 54 NM NW of KMTH · during descent · A319

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EYW UA /OV EYW360045/TM 2314/FL170/TP A319/TB NEG/RM DURD

EYW UAHeader — reporting station and UA: a routine pilot report.

OV EYW360045Location — fix or navaid, optionally with a radial and distance in NM.

TM 2314Reported at 23:14 UTC.

FL170Altitude: 17,000 ft MSL.

TP A319Aircraft type reporting.

TB NEGTurbulence: none reported.

RM DURDRemarks.

PIREP2305Z (7:05 PM EDT) · 80 NM N of KMTH · 12,000 ft MSL · G180

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RSW UA /OV RSW140040/TM 2305/FL120/TP G180/TB NEG

RSW UAHeader — reporting station and UA: a routine pilot report.

OV RSW140040Location — fix or navaid, optionally with a radial and distance in NM.

TM 2305Reported at 23:05 UTC.

FL120Altitude: 12,000 ft MSL.

TP G180Aircraft type reporting.

TB NEGTurbulence: none reported.

PIREP2159Z (5:59 PM EDT) · 94 NM NE of KMTH · altitude unknown · E50P

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FLL UA /OV FLL090000/TM 2159/FL000/TP E50P/RM PILOT SAYS THE CONDITIONS WERE FINE

FLL UAHeader — reporting station and UA: a routine pilot report.

OV FLL090000Location — fix or navaid, optionally with a radial and distance in NM.

TM 2159Reported at 21:59 UTC.

FL000Altitude: 0 ft MSL.

TP E50PAircraft type reporting.

RM PILOT SAYS THE CONDITIONS…Remarks.

PIREP2118Z (5:18 PM EDT) · 66 NM NE of KMTH · during descent · BE58

low-level wind shear

Show raw report

TMB UA /OV TMB090002/TM 2118/FL010/TP BE58/RM LLWS +/-7 KT 2 MILE FINAL RWY 27L

TMB UAHeader — reporting station and UA: a routine pilot report.

OV TMB090002Location — fix or navaid, optionally with a radial and distance in NM.

TM 2118Reported at 21:18 UTC.

FL010Altitude: 1,000 ft MSL.

TP BE58Aircraft type reporting.

RM LLWS +/-7 KT 2 MILE FINAL…Remarks.

⚠️ 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 30 observations, with 4 flight-category changes. The strongest gust reached 18 kt, the lowest ceiling was 2,400 ft. Wind most often came from the SW.

Last 24 hours

VFR 83%MVFR 17%

Wind avg/max: 5/12 kt

Max gust: 18 kt

Lowest ceiling: 2,400 ft

Lowest vis: —

Prevailing wind: SW

Category changes: 4

Most recent change: MVFR → VFR

Last 7 days

VFR 96%MVFR 4%IFR 1%

Wind avg/max: 6/14 kt

Max gust: 23 kt

Lowest ceiling: 2,600 ft

Lowest vis: 1.75 sm

Prevailing wind: E

Category changes: 12

Most recent change: MVFR → VFR

Active Runway - past 30 days

07: 90%
25: 10%

TAF — Terminal Aerodrome Forecast

Issued 2326Z (7:26 PM EDT)

TAF KMTH 282326Z 2900/2924 24006KT P6SM FEW030

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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 6m

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Nearby airports

Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.

VFRMVFRIFRLIFRNo report

Within 25 NM

2 airports

US-12783Big Pine Sands STOLGroundBig Pine Key, Florida, FL18 nm W FD51Summerland Key Cove AirportSummerland Key, FL22 nm W

25–50 NM

6 airports

KNQXNaval Air Station Key West/Boca Chica FieldKey West, FL36 nm WVFR METAR · TAF KEYWKey West International AirportKey West, FL40 nm WVFR METAR · TAF FA05Holiday Isle Seaplane BaseIslamorada, FL28 nm NE 42FLPlantation Key Seaplane BaseMarathon, FL29 nm NE 7FA1Sugar Loaf Shores AirportKey West, FL29 nm W FA81Tavernaero Park AirportTavernier, FL33 nm NE

50–100 NM

8 airports

KHSTHomestead Air Reserve BaseHomestead, FL58 nm NEVFR METAR · TAF KTMBMiami Executive AirportMiami, FL65 nm NEVFR METAR · TAF KMIAMiami International AirportMiami, FL76 nm NEVFR METAR · TAF KOPFMiami-Opa Locka Executive AirportMiami, FL82 nm NEVFR METAR · TAF KMKYMarco Island Executive AirportMarco Island, FL83 nm NWVFR METAR KHWONorth Perry AirportHollywood, FL88 nm NEVFR METAR · TAF

+2 more within 100 NM

See all Florida airports →

Historical Flying Weather

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.

VFR Score

Wind Score

Reliability Score

National VFR rank

#130 of 1,400

Regional rank

State rank

Full historical breakdown

Daylight VFR

93.6%

MVFR

5.1%

IFR

0.8%

LIFR

0.2%

Est. VFR days/yr

294

Most VFR month

April

Fewest VFR month

January

Median ceiling

4,400 ft

Median visibility

10 sm

Calm wind

7.0%

Median wind

7 kt

Gusty hours

19.1%

Crosswind >15 kt

0.6%

Fog/mist days/yr

Thunderstorm days/yr

Summer density alt

1,862 ft

Flight category by month

VFRMVFRIFRLIFR

KMTH monthly flight-category distribution, 2006–2025
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

KMTH average wind by month, 2006–2025
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

South Florida flying weather Most VFR airports Windiest airports Flying Weather Index

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 2608 · 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-submitted

Community-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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