A southeast wind is a wind blowing from the southeast toward the northwest. In meteorology, winds are always named for the direction they come from, not the direction they’re heading. So when a forecast calls for southeast winds, air is moving from roughly 130 to 140 degrees on a compass, arriving from the southeast quadrant of the sky.
Why Winds Are Named by Their Origin
This convention trips people up because it feels backward. A “west wind” doesn’t blow westward. It blows from the west, moving east. NOAA uses this example: a report of a west wind at 15 mph means horizontal winds are coming from the west at that speed. The same logic applies to a southeast wind. The air originates in the southeast and travels toward the northwest.
The naming convention exists because what matters most for weather forecasting is where the air is coming from. Air carries the temperature, humidity, and pressure characteristics of its source region. Knowing the origin tells you far more about what’s heading your way than knowing the destination.
Where Southeast Falls on the Compass
A standard compass divides 360 degrees clockwise from north. Due east sits at 90 degrees, due south at 180. Southeast splits the difference, centered around 135 degrees. In practice, meteorologists classify winds in the range of roughly 112.5 to 157.5 degrees as southeast winds, though weather reports often simplify this to the nearest cardinal or intercardinal direction.
Weather stations measure wind direction with a wind vane. The vane points into the wind, toward the source. If the vane points to the southeast, the wind is a southeast wind.
What Southeast Winds Bring
The weather a southeast wind delivers depends heavily on where you are. In much of the eastern United States, southeast winds pull air from the Gulf of Mexico or the Atlantic Ocean. This maritime tropical air tends to be warm and moisture-rich, especially in summer, when it carries high humidity and can fuel thunderstorms. If you notice a southeast wind picking up on a warm afternoon, increasing mugginess and cloud buildup are common companions.
Southeast winds also play a recognizable role in approaching weather systems. As a cold front moves toward your location, winds often blow from the southeast before the front arrives, then shift clockwise to the southwest or northwest as the front passes through. A sustained southeast wind can be a signal that a front or low-pressure system is on its way, particularly if barometric pressure is dropping at the same time.
In drier inland areas or during winter, a southeast wind may carry continental air with different characteristics entirely. Context matters: the same wind direction over the Gulf Coast and over the Great Plains can mean very different things for temperature and precipitation.
Southeast Winds in Aviation and Sailing
Pilots pay close attention to wind direction because aircraft take off and land into the wind whenever possible. Runways are numbered based on their magnetic heading divided by ten. A runway oriented to receive traffic from the southeast (roughly 130 degrees) would be designated Runway 13. When the tower reports southeast winds, pilots know to favor the runway aligned closest to that direction for shorter ground rolls and safer landings.
Sailors use the same directional convention. A southeast wind fills sails from the southeast, so a boat heading northwest would have that wind directly behind it. Coastal sailors in the tropics and subtropics often associate persistent southeast winds with trade wind patterns, which blow reliably from the east-southeast across large stretches of ocean.
Regional Names for Southeast Winds
Many cultures gave their own names to winds blowing from particular directions, and several famous ones come from the south or southeast. The Sirocco is a warm southerly wind in the Mediterranean that goes by different local names depending on the country: Ghibli in Libya, Chili in Tunisia, and Khamsin in Egypt. The Leveche is a hot, dry wind that strikes Spain’s southeast coast ahead of advancing low-pressure systems. These winds share a common trait: they originate over warm land or sea and carry heat and sometimes dust or sand with them.
These names survive in everyday language because the winds they describe are distinctive and consequential. A Khamsin blowing into Cairo or a Leveche hitting the Spanish coast changes daily life in ways that a generic forecast number doesn’t capture, which is why people named them centuries before modern meteorology existed.