Tainan International Airport / Tainan Air Base

RCNN / TNN

Tainan (Rende), TW

Last Updated
Apr 22, 21:30Z

Military Airport

Restricted

This is a military aerodrome. Civil aircraft access may be restricted or require prior authorization. Consult the applicable AIP for current access procedures.

Consult the applicable national AIP for current access procedures and restrictions.

Current Weather

Display Units
Fresh 26 min ago
21:30Z

🌙 Night
MVFR
Flight Rules
25°C
Temperature
Dewpoint: 23°C
3 kt
100°
8 km
Visibility
Ceiling
Unlimited
342 hPa
QNH
Altimeter Setting

Raw METAR

METAR RCNN 222130Z 10003KT 8000 FEW012 SCT025 25/23 Q1009 NOSIG RMK A2981

Clouds - Visual Profile

12,000ft
9,000ft
6,000ft
3,000ft
Ground
Field Elev: 63 ft
FEW 1,200 ft AGL
SCT 2,500 ft AGL
🌤️
FEW
Few (1/8-2/8 sky coverage)
1,200 ft
AGL (Above Ground)
1,263 ft AMSL
SCT
Scattered (3/8-4/8 sky coverage)
2,500 ft
AGL (Above Ground)
2,563 ft AMSL

Weather Briefing

MVFR

Tainan International Airport / Tainan Air Base is currently reporting marginal VFR (MVFR) conditions with scattered clouds at 2,500 feet and 8 km visibility.

Wind Analysis

Winds are from the east (100°) at 3 knots.

Visibility & Ceiling

Visibility is 8 km, below VFR minimums in some airspace classifications. Check local requirements before departing VFR. No ceiling exists. Cloud layers reported: few at 1,200 ft, scattered at 2,500 ft.

Temperature & Moisture

Temperature is 25°C (77°F) with a dewpoint of 23°C. The temperature-dewpoint spread is very narrow, indicating saturated or near-saturated air. Fog formation or low cloud development is likely.

Forecast Outlook

The TAF forecast covers the next 24 hours. Conditions are expected to fluctuate between VFR and MVFR. VFR pilots should be prepared for deteriorating conditions. Expected weather includes: Light Rain, Light Rain, Mist. Temporary VFR conditions are forecast between 19:00Z and 00:00Z. Temporary MVFR conditions are forecast with Light Rain between 06:00Z and 11:00Z.

Pilot Recommendations

VFR pilots should exercise caution. Consider filing IFR if instrument rated, or postponing the flight if conditions are expected to deteriorate further. The narrow temperature-dewpoint spread creates risk of fog formation, particularly during evening and early morning hours.

This briefing is generated from real-time METAR and TAF data. Always verify with official sources before flight.

QNH
342 hPa
Sea Level Pressure
For altitude above MSL
QFE
340 hPa
Field Pressure
Height above aerodrome (63 ft)
Pressure Alt
20,201 ft
QNE Reference
Standard: 1013 hPa
Density Altitude: 21,416 ft (High - Reduced Performance)
ISA Deviation: +10.1°C

Forecast (TAF)

View Full TAF
Raw TAF
TAF RCNN 221700Z 2218/2318 18004KT 9999 FEW012 SCT025 TX32/2305Z TN23/2220Z TEMPO 2219/2224 FEW012 BKN060 BECMG 2301/2304 27006KT FEW012 BKN060 TEMPO 2306/2311 7000 -RA FEW010 BKN025 BKN050 BECMG 2313/2316 5000 -RA BR FEW008 BKN020 BKN040
Upcoming Changes (Next 12 Hours)
21:55Z BASE
+0h
VFR 180° 4 kt
Visibility: 10+ km
01:00Z BECMG
+4h
VFR 270° 6 kt
Ceiling: 6,000 ft
06:00Z TEMPO
+9h
MVFR
Visibility: 7 km
Ceiling: 2,500 ft
Light Rain

24-Hour Weather Evolution

Loading weather data...
Data Sources
  • • Current conditions from METAR observations
  • • Historical data from past 24 hours
  • • No forecast or predicted data included
  • • Data updated with each new METAR report
Chart Features
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Note: Future values beyond current TAF validity are estimates based on climatological data and trends. Always verify with current forecasts before flight operations.

Airport Runway Layout

N
CNN
18L ✈️
36R
18R ✈️
36L

Runway Information

Runway Length Width Surface Heading Wind Component
✈️ 18L/36R
Active: 18L
10,007 ft 148 ft CON 178°
0.5 kt 3.0 kt
80° angle
✈️ 18R/36L
Active: 18R
10,007 ft 148 ft CON 178°
0.5 kt 3.0 kt
80° angle
🟢 Active Runway: Best headwind component for current conditions
⬆️ Headwind: Favorable wind component
↔️ Crosswind: ≤10kt Safe, 11-15kt Caution, >15kt Challenging

Weather Statistics - RCNN

9,006 observations | Sep 2025 - Apr 2026

Flight Rules Distribution

VFR
73.6%
MVFR
20.3%
IFR
6%
LIFR
0.1%

Tainan International Airport / Tainan Air Base typically experiences VFR conditions 73.6% of the time, though instrument-rated pilots will find IFR weather present approximately 6.1% of observations. Prevailing winds are from the N averaging 6.3 knots. Temperature extremes range from 0°C to 35°C, reflecting significant seasonal variation. The best months for VFR flying are October, January, September.

Wind Analysis

Prevailing Direction: N (0°)
Average Speed: 6.3 kt
Maximum Recorded: 21 kt
Calm Winds: 6.4%
Direction Distribution:
N
49.9%
NE
13%
E
5.5%
SE
2.3%
S
2.6%
SW
2.2%
W
6.5%
NW
11.5%

Temperature Range

Average: 23.8°C
Range: 0°C to 35°C
0°C 35°C

Visibility

Average: 10 SM
Below 3 SM: 0%
Fog Frequency: 0%

Best Months for VFR

October January September

Runway Wind Analysis

Runway 18L/36R
Favorable wind: 100%
Avg crosswind: 2.6 kt
Runway 18R/36L
Favorable wind: 100%
Avg crosswind: 2.6 kt

Statistics computed from 9,006 METAR observations (Sep 2025 - Apr 2026). Data sourced from official aviation weather services. Updated daily.

Tainan International Airport / Tainan Air Base - Airport Information

Airport Details

ICAO Code: RCNN
IATA Code: TNN
Type: medium airport
Status: active
Elevation: 63 ft MSL

Location

City: Tainan (Rende)
Country: TW
Latitude: 22.950399°
Longitude: 120.206001°
Time Zone: Etc/GMT-8

Runway Information

Runway 18L/36R
Length: 10,007 ft
Width: 148 ft
Surface: CON
ILS: No
Runway 18R/36L
Length: 10,007 ft
Width: 148 ft
Surface: CON
ILS: No

About Tainan International Airport / Tainan Air Base

Tainan International Airport / Tainan Air Base is a military facility. Civilian access may be restricted or require Prior Permission (PPR). Pilots should consult the TW AIP for current access procedures and restrictions.

Overview

Tainan International Airport serves the Tainan metropolitan area in southern Taiwan, functioning as both a civilian and military airfield. Located in Rende at an elevation of 63 feet MSL, the airport provides critical aviation infrastructure for the region with two parallel concrete runways, each 10,007 feet in length. Its strategic position supports both commercial and military aviation operations.

Flying Conditions

Statistical data indicates highly favorable flying conditions, with 77.6% of observations reporting VFR conditions. Wind patterns are predominantly northerly at an average of 6.1 knots, with occasional peaks up to 21 knots. Temperature ranges from 0°C to 35°C, with an average of 24.1°C, suggesting stable and predictable meteorological conditions for most of the year.

Notable Features

The airport features two parallel runways (18L/36R and 18R/36L) with identical configurations, both offering 10,007 feet of concrete surface. Both runways demonstrate consistently favorable wind alignment, with 100% wind compatibility and minimal average crosswind of 2.3 knots. The airport's low elevation and geographical positioning contribute to generally consistent operational parameters.

Approach Considerations

Pilots can expect excellent visibility averaging 10 statute miles, with minimal instances of restricted conditions. January, September, and October represent the most consistently favorable flying months. The dual parallel runway configuration provides operational flexibility, with both runways showing identical wind characteristics and length, enabling reliable approach and departure options.

Data Sources & Accuracy: Airport information sourced from OurAirports.com, a collaborative database of worldwide airport data. Weather data from official aviation weather services including NOAA Aviation Weather Center and international METAR/TAF providers. Information is updated regularly but pilots should always verify current conditions and NOTAMs through official channels before flight operations.

Official Data Sources

Weather NOAA Aviation Weather Center • International METAR/TAF Network
Airports OurAirports.com • Public domain airport database
NOTAMs FAA NOTAM System • ICAO NOTAM Distribution
Last updated: Jan 1, 1970 12:00 AM UTC

Disclaimer: Data is provided for informational purposes only. Pilots must verify all information through official sources before flight operations. Weather conditions change rapidly; always obtain a current briefing from approved weather services.