Portland Mulino Airport (K4S9) Area Aviation Weather & Runway Winds
As of 9:53 PM PDT, Oct 27, based on the nearest station (KUAO), K4S9 is currently VFR with winds from 180° at 7 knots, visibility not reported, and a 10,000 ft ceiling.
Aviation weather near Portland Mulino Airport in Portland-Mulino, OR, decoded from the nearest reporting station (KUAO): conditions and runway crosswinds.
Portland Mulino Airport (K4S9) is a general aviation airport serving pilots in and around Portland-Mulino, OR at a field elevation of 260 ft. K4S9 has no weather station of its own. Conditions here are decoded from KUAO, about 8 nm away, the nearest reporting station, and local conditions can differ. It has one runway (14/32), the longest 3,425 ft. The nearest TAF is issued for KUAO.
No weather station at this airport: showing the nearest station KUAO, 7.8 nm away.
Wind from the south (180°) at 7 kt, visibility visibility not reported, overcast at 10,000 ft, temperature 9°C (49°F), altimeter 30.06 inHg. Conditions are Visual Flight Rules (VFR), ceiling 10,000 ft.
METAR KUAO 280453Z AUTO 18007KT OVC100 09/08 A3006 RMK AO2 SLP180 T00940078 $
What changed at KUAO (nearest station)?
Since the 0353Z (8:53 PM PDT) report, compared automatically against the latest METAR.
- Temperature–dewpoint spread narrowed to 2°C. Watch for fog or low cloud.
Current pilot readout for K4S9
Based on the nearest station (KUAO), K4S9 is currently VFR with winds from 180° at 7 knots, visibility not reported, and a 10,000 ft ceiling. the wind favors runway ends 14. Density altitude is approximately -500 ft (field elevation 260 ft). Review the latest TAF below for forecast changes before departure.
New to aviation weather? How to read a METAR → · What VFR/MVFR/IFR mean → · Decode any METAR/TAF → · Density altitude calculator →
Runway wind check
Estimated head/tailwind and crosswind for each runway end from the current reported wind.
| Runway | Length | Surface | Head / Tail | Crosswind |
|---|---|---|---|---|
| 14FAV | 3,425 ft | ASP | 7 kt head | 2 kt right |
| 32 | 3,425 ft | ASP | 7 kt tail | 2 kt left |
Open the crosswind calculator to try your own wind and runway numbers →
K4S9 runways
1 physical runway · 2 runway ends. Each card opens the runway's intelligence page: equipment and lighting, LAHSO, frequencies, today's configuration, predicted use, history and approaches.
- Status not monitoredRunway 14/323,425 × 100 ft · ASPCurrent useno stated-runway source at K4S9Wind
- 14
- 7 kt headwind · 2 kt crosswind from right
- 32
- 7 kt tailwind · 2 kt crosswind from left
no active equipment NOTAM receivedView Runway Intelligence →
“Current use” is what the facilitystates; wind components are arithmetic on the current METAR against TRUE headings; status reflects NOTAMs received through SWIM, the tower's TFDM record and the D-ATIS — a runway reads “Open” only with a complete NOTAM picture.
24-hour trend
Wind, ceiling and flight category over the last 24 hours.
Over the last 23 h: wind 7→7 kt, ceiling 4,000 ft → 10,000 ft.
K4S9 weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.
Radar: NOAA/NWS via IEM · Forecast: NOAA HRRR · Lightning: NOAA · Map © Stadia Maps © OpenMapTiles © OpenStreetMap
NOAA NEXRAD composite and lightning, updated about every five minutes; amber frames are HRRR model guidance, not observed radar. Not for navigation.
Pilot reports (PIREPs) within 100 NM of K4S9
Reported by pilots in flight over the past 6 hours, via aviationweather.gov.
Show raw report
RDM UA /OV RDM/TM 0334/FL050/TP E75L/IC NEG
RDM UAHeader: reporting station and UA: a routine pilot report.OV RDMLocation: fix or navaid, optionally with a radial and distance in NM.TM 0334Reported at 03:34 UTC.FL050Altitude: 5,000 ft MSL.TP E75LAircraft type reporting.IC NEGIcing: none reported.Show raw report
YKM UA /OV YKM165035/TM 0330/FL380/TP B38M/RM MTW +/-15KTS ZSE
YKM UAHeader: reporting station and UA: a routine pilot report.OV YKM165035Location: fix or navaid, optionally with a radial and distance in NM.TM 0330Reported at 03:30 UTC.FL380Altitude: 38,000 ft MSL.TP B38MAircraft type reporting.RM MTW +/-15KTS ZSERemarks.Show raw report
PDX UA /OV PDX360006/TM 0250/FL065/TP C56X/TA 02/IC LGT RIME 065-100/RM DURD
PDX UAHeader: reporting station and UA: a routine pilot report.OV PDX360006Location: fix or navaid, optionally with a radial and distance in NM.TM 0250Reported at 02:50 UTC.FL065Altitude: 6,500 ft MSL.TP C56XAircraft type reporting.TA 02Outside air temperature, °C.IC LGT RIME 065-100Icing: light rime 6,500–10,000 ft.RM DURDRemarks.Show raw report
PDX UA /OV KPDX10307/TM 0147/FL025/TP B739/SK OVC030-TOPUNKN
PDX UAHeader: reporting station and UA: a routine pilot report.OV KPDX10307Location: fix or navaid, optionally with a radial and distance in NM.TM 0147Reported at 01:47 UTC.FL025Altitude: 2,500 ft MSL.TP B739Aircraft type reporting.SK OVC030-TOPUNKNSky condition: cloud bases and tops in hundreds of feet MSL.Show raw report
PDX UA /OV KPDX100005/TM 0104/FLDURD/TP B739/SK OVC030-TOPUNKN/RM RAGGED
PDX UAHeader: reporting station and UA: a routine pilot report.OV KPDX100005Location: fix or navaid, optionally with a radial and distance in NM.TM 0104Reported at 01:04 UTC.FLDURDReported during descent.TP B739Aircraft type reporting.SK OVC030-TOPUNKNSky condition: cloud bases and tops in hundreds of feet MSL.RM RAGGEDRemarks.⚠️ PIREPs are unverified pilot reports. Not for operational use: conditions change between reports.
Recent aviation weather trends at K4S9
From ATIS Alerts' hourly weather history.
Over the past 24 hours, the nearest station KUAO reported a mix of conditions, most often VFR across 34 observations, with 12 flight-category changes. The strongest gust reached 15 kt, the lowest ceiling was 500 ft. Wind most often came from the S.
Most recent change: MVFR → VFR
Most recent change: MVFR → VFR
Share of hours each runway had the most headwind. From wind reports, not ATC assignments.
- 32
- 66%
- 14
- 34%
TAF | Terminal Aerodrome Forecast
Issued 0520Z (10:20 PM PDT)
TAF KUAO 280520Z 2806/2906 19007KT P6SM VCSH FEW030 BKN050 FM280700 20012G20KT 6SM -SHRA BKN030 OVC040 FM281400 20008KT P6SM -SHRA BKN025 OVC035 FM282000 21005KT P6SM -SHRA SCT030 BKN050
New to TAFs? How to read one →
Get K4S9 weather alerts in Telegram
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Live crosswind meter
K4S9 has no weather feed online, so the wind comes from KUAO, 7.8 nm away.
Wind is 20° off runway 14, the end with the most headwind right now.
Have a weather station at K4S9? Help us make your field's weather available to every pilot, free. Add your field's wx station →Asphalt · 3,425 ft. Headings from FAA runway data. Not for navigation.
Field aerial
North up
Runway 14/32 drawn from FAA threshold coordinates.
Imagery: USGS The National Map (public domain). Something off? ✏️ Suggest an edit
Airport info
From the FAA airport record (cycle 2026-10-01) and OurAirports.
Services
- Fuel
- 100LL
- Attended
- Unattended
- Repairs
- Airframe & engine, major
- Transient parking
- Tie-downs
- Landing fee
- No
- Other services
- Flight instruction · Parachute jumping · Aircraft rental
- Control tower
- None
- Wind indicator
- Lighted
Airport
- Type
- General aviation airport
- FAA LID
- 4S9
- City
- Portland-Mulino
- State
- Oregon
- Country
- United States
- Elevation
- 260 ft
- Coordinates
- 45.2163, -122.5900
- Runways
- 1 physical runway · 2 runway ends
- Longest runway
- 3,425 ft
- Weather reporting
- Nearest station KUAO
- TAF
- Nearest KUAO
- Time zone
- America/Los_Angeles
- Next sunset
- 19h 25m
Run a flight school, FBO, or club here? Embed K4S9's live status on your website, free →
Nearby airports
Compare nearby METAR/TAF stations within 25, 50 and 100 NM before departure or arrival.
Within 25 NM
11 airports+5 more within 25 NM
25–50 NM
5 airports50–100 NM
8 airports+2 more within 100 NM
RC flying fields nearby
AMA model-aircraft club fields around this airport: live wind, crosswind & flyability on each page.
- Molalla Radio Control Association - S Molalla Forest Rd , Molalla, OR · 6 mi
- Barnstormers RC Club Field , Aurora, OR · 13 mi
- Mt. Silverwood RC Club - Dominic Rd , Mount Angel, OR · 14 mi
Customize your 4S9 shirt or mug
4S9's real runway layout on the back, elevation and tower frequency on the front. Add your tail number on the sleeve.
Pilot PIREPs for Portland Mulino Airport (K4S9)
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 Portland Mulino 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 K4S9 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.
⚠️ Not for operational use. Always verify with official FAA-approved preflight weather sources before flight.
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