Golf is heavily affected by the weather. Rain makes grips slippery and greens slow, and strong wind changes how far and where the same club sends the ball. So when you check the weather for a round, look at the chance of rain and wind speed before "sunny" or "cloudy".
Every course page on Teenaru has a 10-day forecast and golf index for that course's location. This guide explains where each number comes from and how to read it.
The 10-day forecast joins two forecasts
The Korea Meteorological Administration (KMA) issues two kinds of forecasts depending on the time range. Teenaru joins them to show 10 days.
- Short-term forecast (today to 3 days ahead): forecasts for a 5km grid. We use the grid cell that contains the course, so it is the most accurate and includes temperature, chance of rain and wind speed.
- Mid-term forecast (4 to 10 days ahead): forecasts for wide areas such as a province. These days are marked "Mid-term" and have no wind data. Temperatures come from the reference city closest to the course.
Forecasts further out change more often. Use the mid-term forecast for a rough idea when booking, then check the short-term forecast again 2–3 days before your round.
Sky conditions follow golf hours
The "Clear, Partly cloudy, Cloudy, Rain" shown for each day is based on the forecast from 6 a.m. to 3 p.m., not the whole day. If rain or snow is forecast at any point in that window, the day is shown as rain (or snow), because most rounds are played during these hours.
How the golf index works
The "Golf: Good / Fair / Poor" label under each day is calculated as follows.
- Poor: chance of rain 60% or more, or maximum wind speed 9m/s or more
- Fair: chance of rain 30% or more, or maximum wind speed 5m/s or more, or a high below 5°C or above 32°C
- Good: none of the above
Mid-term days have no wind data, so the index uses only chance of rain and temperature. A windy day can still show "Good". If the course is by the sea or in the mountains, check the wind speed in the short-term forecast right before your round.
The golf index is for reference only and is based on forecasts. Rain policies and cancellation rules differ by course, so check with the course you booked.
Getting a feel for wind speed
Forecast wind speed is in meters per second (m/s). Roughly:
- 3m/s or less: flags barely move. Little effect on play.
- Around 5m/s: flags flutter, and the distance and direction of high iron shots change noticeably. This is where the golf index becomes "Fair".
- 9m/s or more: strong enough to blow off a cap. The ball curves a lot and even putting is affected. This is the "Poor" threshold.
On windy days, the usual approach is to hit a lower ball flight or take one or two more clubs.
Current weather on the map
Tap a course on the main map and the info card shows the current weather. This comes from the KMA ultra-short-term forecast, issued at 30 minutes past each hour: the temperature, sky, wind and humidity for the nearest hour. The time is shown as "KMA as of hh:mm" below. It is handy for checking conditions right before you leave or during your round.
In short
- When booking, check the 10-day forecast for rain.
- Two or three days before your round, check the chance of rain and wind speed in the short-term forecast again.
- Right before you leave, check the current weather on the map.
- If rain or strong wind is forecast, check the course notices for rain policies and cancellation rules.
You can find the forecast in the "10-day forecast" section of each course page on the map.