WxDecoder

K4S9 Weather Portland Mulino Airport

Portland-Mulino, OregonElevation 260 ftSmall airport
OFF-FIELD REFERENCE
Nearest report: KTTD · 22 NM N · More than 1 hour old
No ceiling, visibility 10 SM.
No on-field report, so no field flight category. Conditions at the field may differ.
OFF-FIELD REFERENCE · KTTD
WIND
090@12
steady
VISIBILITY
10 SM
16.1 km
CEILING
None
no BKN/OVC layer
FORECAST & PILOT NOTES · SUPPLEMENTAL

Extended forecast and pilot notes

No aviation METAR is published for this airport. The nearest National Weather Service station reports wind from 170° at 7 kt, visibility 10 SM, temperature 12C. Treat this as supplemental, not an aviation observation. Forecast suggests tonight rain, low near 44F, 95% chance of precipitation. Key risks: thunderstorms in the forecast.

PILOT WEATHER NOTES
Thunderstorms in the forecastWeather.gov
Wednesday: Showers And Thunderstorms. Watch for developing convection and plan alternates.
DayConditionsTemp FWindGustsPrecipPilot note
Tonight Rain 44 SSE 6 kt – 95%
Monday Light Rain 57/44 S 7 kt – 91%
Tuesday Light Rain 58/41 SW 5 kt – 91%
Wednesday Showers And Thunderstorms 56/38 SSW 11 kt – 97% Thunderstorms in the forecast
Thursday Light Rain 55/34 S 10 kt – 83%
Friday Chance Light Rain 56/32 S 2 kt – 26%
Saturday Partly Sunny 58/33 N 2 kt – 13%
Sunday Mostly Sunny then Chance Light Rain 59 N 2 kt – 9%

Source: National Weather Service (office PQR). Forecast issued 0153Z.

Radar

Radar data: NOAA/NWS MRMS composite reflectivity. For situational awareness only, not a substitute for an official weather briefing.

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RUNWAYS & WIND
1 runway
NESW1432
WIND
No on-field weather data
No reporting weather station on the field, so wind components cannot be computed. See nearby stations below.
RUNWAYS

Runway detail & declared distances

1 runway · longest 3,425 ft

14/32
Dimensions
3,425 x 100 ft
Surface
Asphalt (good)
Edge lights
MED
RWY 14159°T
VGSIPAPI (P2L)
Traffic patternRight
RWY 32340°T
VGSIPAPI (P2L)

Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.

FIELD CONDITIONS

Field elevation

Field elevation
260 ft MSL

Density and pressure altitude need a current temperature and altimeter from the METAR.

DAYLIGHT & NIGHT

Sun & logging windows

Sunset
0108Z 6:08 PM
Sunrise
1440Z 7:40 AM
Loggable night
0138Z (6:38 PM local) → 1410Z (7:10 AM local)
end of evening to start of morning civil twilight
Position lights required
0108Z (6:08 PM local) → 1440Z (7:40 AM local)
sunset to sunrise (91.209)
Night passenger currency
0208Z (7:08 PM local) → 1340Z (6:40 AM local)
1 hr after sunset to 1 hr before sunrise (61.57(b))

FAA definitions, shown in Zulu with airport-local time. Verify for your operation.

AIRPORT INFORMATION

Facility & services

Portland Mulino Airport is in Portland-Mulino, Oregon. Field elevation 260 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.

OPERATIONS & CONTACT
OwnershipPublicly owned
UseOpen to the public
TypeSmall airport
ManagerOREGON DEPARTMENT OF AVIATION
Manager phone503-378-4880
AttendedUNATNDD
CHARTS & AIRSPACE
ICAO / IATAK4S9
SectionalSEATTLE
Center (ARTCC)SEATTLE
Flight service (AFSS)MC MINNVILLE
RegionOregon
CountryUnited States
Coordinates45.2163, -122.5900
Distance from city20 NM S
SERVICES & LIGHTING
Fuel100LL
Control towerNon-towered
Field lightingSee remarks
BeaconSunset to sunrise · White-green (lighted land airport)
CTAF123.050
UNICOM123.050
FREQUENCIES

Communications

119.95
CLD
CLD
123.05
CTAF/UNICOM
UNIC
123.050
CTAF
CTAF
123.050
UNICOM
UNICOM

Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.

AIRCRAFT ACTIVITY

K4S9 traffic patterns

2026-06-12 to 2026-10-23, 67 days observed · data 2026-10-23

High confidence
TRAFFIC VOLUME (30-DAY)
AVG LANDINGS/DAY
7.8
AVG OPS/DAY
13.1
Activity trend over 18 days: rising, from 1 to 8 operations per dayOperations trend (18 days)

Busiest day: Sat · Busiest month: Jun

FLEET MIX
Unknown 45%Piston single 41%Helicopter 9%Turboprop 5%

Fleet composition unclear from available data.

TOP AIRCRAFT TYPES
›C172 (Piston single) · ~29 landings/mo
›P750 (Unknown) · ~16 landings/mo
›PA18 (Unknown) · ~15 landings/mo
›UNKN (Unknown) · ~14 landings/mo
›H500 (Helicopter) · ~9 landings/mo
LIKELY BASED AIRCRAFT
Low-confidence estimate

Aircraft likely based near this airport (estimate), mostly single-engine piston aircraft.

›C172 (Piston single)
›C182 (Piston single)
›P28A (Piston single)
›P750 (Unknown)
›RV12 (Unknown)

This is an estimate based on repeated flight patterns, not registration data. Do not rely on it to identify specific aircraft or owners.

Data limitations (4)
›ADS-B coverage is incomplete; counts are an observed lower bound, not official totals.
›Some aircraft do not transmit usable ADS-B and are not counted.
›Aircraft types and based estimates are inferred and may be wrong.
›This is not official ATC, FAA, or airport data.
NEARBY AIRPORTS

Weather reference stations

K4S9 has no on-field report. Nearest reporting station: KTTD (22 NM N, VFR).

KTTD Portland Troutdale Airport
22 NM N
VFR
KPDX Portland International Airport
22 NM N
MVFR
KMMV McMinnville Municipal Airport
23 NM W
VFR
KHIO Portland Hillsboro Airport
25 NM NW
MVFR
KSLE Salem-Willamette Valley Airport/McNary Field
25 NM SW
MVFR
KCVO Corvallis Municipal Airport
52 NM SW
VFR
AIRPORT REMARKS

Operational remarks

›WILDLIFE ON & INVOF OF ARPT.
›ACTIVATE MIRL RY 14/32, TWY LGTS, & WINDCONE - CTAF. PAPI RYS 14 & 32 OPR 24 HRS.
›FOR CD CTC PORTLAND APCH AT 503-493-7545.
›EXISTED PRIOR TO 1959.
›SKYDIVING ACTIVITY ON AND IN VICINITY OF AIRPORT. LANDING ZONE 1400' EAST OF RUNWAY.
›BE ALERT FOR WEEKEND GLIDER ACTIVITY.
›RY 32 DESIGNATED CALM WIND RY.
›PAPI OTS INDEF.
OFFICIAL LINKS & SOURCES
↗Search NOTAMs (official FAA NOTAM Search)
↗Wikipedia
↗K4S9 on OurAirports
FREQUENTLY ASKED
Does K4S9 have a METAR?
No on-field METAR is issued for K4S9. This page uses the nearest reporting station as a reference.
Does K4S9 have a TAF?
No TAF is issued directly for K4S9. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at K4S9?
K4S9 sits at 260 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for K4S9?
No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.
This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.