Portland Mulino Airport (K4S9) Area Aviation Weather & Runway Winds
Aviation weather near Portland Mulino Airport in Portland-Mulino, OR, decoded from the nearest reporting station (KUAO): conditions, runway crosswinds, and free Telegram airport alerts.
Portland Mulino Airport (K4S9) is a general aviation airport serving pilots in and around Portland-Mulino, OR at 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. Its 2 runways (14, 32), longest 3,425 ft, are checked against the current wind in the crosswind table below. The nearest TAF is issued for KUAO. Track it in the ATIS Alerts Telegram bot to get alerts read from KUAO, the station this page is based on.
No weather station at this airport: showing the nearest station KUAO, 7.8 nm away.
Wind calm, visibility visibility not reported, a few clouds at 3,200 ft, temperature 13°C (55°F), altimeter 29.95 inHg.
METAR KUAO 130453Z AUTO 00000KT FEW032 13/11 A2995 RMK AO2 SLP141 T01280111 $
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.
This is exactly what ATIS Alerts watches for you: get a Telegram message when K4S9's weather changes, free →
Current pilot readout for K4S9
Based on the nearest station (KUAO), K4S9 has no current flight category, but is reporting with calm winds, visibility not reported, and no ceiling reported. Density altitude is approximately 0 ft (field elevation 260 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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Track K4S9 free on TelegramRunway 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 K4S9. 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 |
|---|---|---|---|---|
| 14 | 3,425 ft | ASP | - | - |
| 32 | 3,425 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 23 h: wind 0→0 kt, ceiling unlimited → unlimited.
K4S9 weather radar
Live NEXRAD + lightning, with a 4-hour future-radar forecast. Drag to pan, tap ⚡ to toggle lightning.
Live weather radar around Portland Mulino Airport in Portland-Mulino, OR: 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 K4S9 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 K4S9
Reported by pilots in flight over the past 6 hours, via aviationweather.gov.
Show raw report
PDX UA /OV BTG070020/TM 0451/FL100/TP B738/TA M06/IC LGT RIME/RM DURC 100-180-ZSE
PDX UAHeader: reporting station and UA: a routine pilot report.OV BTG070020Location: fix or navaid, optionally with a radial and distance in NM.TM 0451Reported at 04:51 UTC.FL100Altitude: 10,000 ft MSL.TP B738Aircraft type reporting.TA M06Outside air temperature, °C.IC LGT RIMEIcing: light rime.RM DURC 100-180-ZSERemarks.Show raw report
RDM UA /OV RDM/TM 0410/FL056/TP E75L/TA UNKN/TB LGT/IC NEG/RM DURD RWY 5
RDM UAHeader: reporting station and UA: a routine pilot report.OV RDMLocation: fix or navaid, optionally with a radial and distance in NM.TM 0410Reported at 04:10 UTC.FL056Altitude: 5,600 ft MSL.TP E75LAircraft type reporting.TA UNKNOutside air temperature, °C.TB LGTTurbulence: light.IC NEGIcing: none reported.RM DURD RWY 5Remarks.Show raw report
DLS UA /OV LTJ069031/TM 0353/FL320/TP B38M/SK TOP320/TB MOD 320 BLO /RM DURD ZSE
DLS UAHeader: reporting station and UA: a routine pilot report.OV LTJ069031Location: fix or navaid, optionally with a radial and distance in NM.TM 0353Reported at 03:53 UTC.FL320Altitude: 32,000 ft MSL.TP B38MAircraft type reporting.SK TOP320Sky condition: cloud bases and tops in hundreds of feet MSL.TB MOD 320 BLOTurbulence: moderate 320 blo.RM DURD ZSERemarks.Show raw report
AST UA /OV AST/TM 0323/FL060/TP PC12/SK SCT035-040 SCT050-060 OVC060/TB NEG/IC NEG/RM DURD RNAV 26 ZSE
AST UAHeader: reporting station and UA: a routine pilot report.OV ASTLocation: fix or navaid, optionally with a radial and distance in NM.TM 0323Reported at 03:23 UTC.FL060Altitude: 6,000 ft MSL.TP PC12Aircraft type reporting.SK SCT035-040 SCT050-060 OVC…Sky condition: cloud bases and tops in hundreds of feet MSL.TB NEGTurbulence: none reported.IC NEGIcing: none reported.RM DURD RNAV 26 ZSERemarks.Show raw report
EUG UA /OV UBG165025/TM 0259/FL220/TP E75L/TB MOD /RM ZSE
EUG UAHeader: reporting station and UA: a routine pilot report.OV UBG165025Location: fix or navaid, optionally with a radial and distance in NM.TM 0259Reported at 02:59 UTC.FL220Altitude: 22,000 ft MSL.TP E75LAircraft type reporting.TB MODTurbulence: moderate.RM ZSERemarks.Show raw report
PDX UA /OV PDX103010/TM 0218/FLDURD/TP B739/SK OVC030
PDX UAHeader: reporting station and UA: a routine pilot report.OV PDX103010Location: fix or navaid, optionally with a radial and distance in NM.TM 0218Reported at 02:18 UTC.FLDURDReported during descent.TP B739Aircraft type reporting.SK OVC030Sky condition: cloud bases and tops in hundreds of feet MSL.Show raw report
DLS UA /OV LTJ180015/TM 0215/FL180/TP B739/TB MOD 300-140/RM DURD-ZSE
DLS UAHeader: reporting station and UA: a routine pilot report.OV LTJ180015Location: fix or navaid, optionally with a radial and distance in NM.TM 0215Reported at 02:15 UTC.FL180Altitude: 18,000 ft MSL.TP B739Aircraft type reporting.TB MOD 300-140Turbulence: moderate 30,000–14,000 ft.RM DURD-ZSERemarks.Show raw report
DLS UA /OV LTJ005028/TM 0140/FL300/TP B39M/TB MOD 300-320/RM DURC ZSE
DLS UAHeader: reporting station and UA: a routine pilot report.OV LTJ005028Location: fix or navaid, optionally with a radial and distance in NM.TM 0140Reported at 01:40 UTC.FL300Altitude: 30,000 ft MSL.TP B39MAircraft type reporting.TB MOD 300-320Turbulence: moderate 30,000–32,000 ft.RM DURC ZSERemarks.⚠️ 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 mostly VFR across 24 observations, with 2 flight-category changes. The lowest ceiling was 2,900 ft. Wind most often came from the S.
Most recent change: MVFR → VFR
Most recent change: MVFR → VFR
- 32
- 52%
- 14
- 48%
TAF | Terminal Aerodrome Forecast
Issued 2329Z (4:29 PM PDT)
TAF KUAO 122329Z 1300/1324 21005KT P6SM BKN060 FM130100 20004KT P6SM -SHRA OVC050 FM130600 19004KT P6SM VCSH BKN035 FM131500 22008KT P6SM -SHRA OVC025 FM132000 19007KT P6SM SCT025 OVC035
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Nearby TFRs
Active FAA TFRs near K4S9
FAA TFR data shows an active temporary flight restriction near K4S9.
View all active US TFRs → · Official FAA TFR ↗
Verify with official FAA TFR sources before flight.
Airport facts
Reference data from the OurAirports dataset.
- Type
- General aviation airport
- FAA LID
- 4S9
- City
- Portland-Mulino
- State
- Oregon
- Country
- United States
- Elevation
- 260 ft
- Coordinates
- 45.2163, -122.5900
- Runways
- 2
- Longest runway
- 3,425 ft
- Weather reporting
- Nearest station KUAO
- TAF
- Nearest KUAO
- Time zone
- America/Los_Angeles
- Next sunset
- 21h 21m
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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
K4S9 weather: frequently asked
What runways are available at K4S9?+
K4S9 has 2 runways: 14, 32; the longest is 3,425 ft. This page computes the live crosswind for each runway end from the current wind.
Where does the weather shown for K4S9 come from?+
Portland Mulino Airport does not have its own weather station. Conditions shown here come from the nearest reporting station, KUAO, about 8 nm away, close enough for situational awareness, but local conditions at K4S9 can differ.
Does K4S9 have a TAF?+
Yes. The KUAO TAF is shown on this page below the current conditions.
Does K4S9 broadcast D-ATIS?+
No. K4S9 does not broadcast D-ATIS. Alerts for K4S9 from the ATIS Alerts bot (@atisalerts_bot) are based on its METAR (via the nearest reporting station) instead.
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.
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