Current Weather
Raw METAR
Clouds - Visual Profile
Weather Briefing
IFRSan Marcos Regional Airport is currently reporting instrument flight rules (IFR) conditions with overcast skies at 800 feet and 10 SM visibility.
Wind Analysis
Winds are from the south (190°) at 5 knots. Runway 17/35 is favored with a 5-knot headwind and 2-knot crosswind component.
Visibility & Ceiling
Visibility is 10 SM. The ceiling is 800 feet AGL (overcast). Only precision approaches may be usable depending on minimums.
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.
Pilot Recommendations
An instrument rating and IFR flight plan are required. Verify that destination and alternate approach minimums are above current and forecast conditions. 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.
24-Hour Weather Evolution
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Airport Runway Layout
Runway Information
| Runway | Length | Width | Surface | Heading | Wind Component |
|---|---|---|---|---|---|
| 08/26 | 6,330 ft | 100 ft | ASP | 87° |
↓ 1.1 kt
•
↔ 4.9 kt
103° angle
|
| 13/31 | 5,603 ft | 150 ft | ASP | 132° |
↑ 2.6 kt
•
↔ 4.2 kt
58° angle
|
|
✈️ 17/35
Active: 17
|
5,213 ft | 100 ft | ASP | 177° |
↑ 4.7 kt
•
↔ 1.7 kt
20° angle
|
Weather Statistics - KHYI
7,812 observations | Sep 2025 - Jun 2026Flight Rules Distribution
San Marcos Regional Airport typically experiences VFR conditions 62.7% of the time, though instrument-rated pilots will find IFR weather present approximately 12.3% of observations. Prevailing winds are from the S averaging 8.7 knots, with gusts recorded up to 35 knots. Temperature extremes range from -8°C to 37°C, reflecting significant seasonal variation. The best months for VFR flying are September, October, February.
Wind Analysis
Temperature Range
Visibility
Best Months for VFR
Runway Wind Analysis
Statistics computed from 7,812 METAR observations (Sep 2025 - Jun 2026). Data sourced from official aviation weather services. Updated daily.
San Marcos Regional Airport - Airport Information
Airport Details
Location
Runway Information
Flight Planning Tools
Nearby Airports
About San Marcos Regional Airport
Overview
San Marcos Regional Airport serves central Texas, located southwest of Austin in Hays County. The medium-sized airport features three asphalt runways, providing versatile access for general aviation, training, and regional operations. Its elevation of 597 feet MSL positions it in a relatively flat terrain typical of the Texas Hill Country.
Flying Conditions
Weather conditions at San Marcos demonstrate predominantly VFR operations, with 70.2% of observations showing favorable visual flight conditions. The airport experiences a wide temperature range from -3°C to 37°C, with an average of 19.3°C. Prevailing winds from the south at an average of 7.8 knots create generally stable flying conditions, with September, October, and January offering the most consistent VFR weather.
Notable Features
The airport's three runways offer multiple landing options with consistent wind alignment. All three runways demonstrate 100% favorable wind coverage, with Runway 08/26 being the longest at 6,330 feet. Crosswind components remain relatively mild, averaging between 3.6 and 6.3 knots across the different runway orientations, providing pilots with flexible approach options.
Approach Considerations
Pilots can expect excellent visibility averaging 9.8 statute miles, with minimal instances of reduced conditions (only 1.4% of observations below 3SM). The southern prevailing winds suggest Runway 08/26 and 13/31 will typically offer the most aligned approach paths. Minimal fog occurrence (0.3%) further enhances consistent accessibility to the airport.
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.
Learn More
Recommended guides based on current conditions at KHYI
Official Data Sources
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.