What Is the G-Score?
A 0–100 golf playability score that translates raw weather into a single, comparable number for any course on any day.
The G-Score replaces guesswork with one number. Standard forecasts tell you what the weather is. The G-Score tells you how playable it will be — for golf, on this course, at this hour, given everything we know about how wind, temperature, precipitation, humidity, and UV combine to shape a round.
The Five Inputs
Each variable is weighted independently, then combined into the final 0–100 score. A perfect 100 represents calm, mild, dry, comfortable conditions. A score below 40 means weather is meaningfully shaping the round.
Wind Speed & Gusts
Heaviest weightingSustained wind above 10 mph begins suppressing playability. Above 25 mph, the score drops 40 points and ball flight becomes the dominant variable on every shot.
Temperature & Feels-Like
High weightingThe optimum range is 65–78°F. Above 84°F, heat stress and ball-compression effects reduce playability. Below 55°F, cold-air density and player flexibility cost yards on every iron.
Precipitation & Storm Risk
Heavy weighting (binary)Active rain drops the score by 30 points. Snow or ice drops it by 50. Lightning risk drops it by 60 — these are non-negotiable safety floors.
Cloud Cover & UV Index
Light weightingMild cloud cover dings the score 5 points for visibility. High UV adds physiological strain on later holes — it is reflected in the feels-like component.
Air Density (Humidity + Pressure)
Light weightingCounter to intuition, humid air is slightly less dense than dry air, marginally extending ball flight. Combined with barometric pressure, this becomes meaningful on long irons.
G-Score Bands
Worth booking a flight for
Standard trip planning rewards
Some compromise — one dominant variable
Weather is shaping the round
Conditions overrule skill
Frequently Asked
What does a G-Score of 80 mean?
A G-Score of 80 indicates premium playability — mild temperature, low wind, dry conditions, comfortable humidity. Travelers should book confidently around 80+ days.
Should I cancel a round if the G-Score is below 60?
Not automatically. A 55–69 G-Score still represents good golf with some compromise — typically a single dominant variable like high wind or cool temperature. Use it as a planning signal, not a cancellation trigger.
How is the G-Score different from a regular weather forecast?
Weather forecasts give you raw inputs (temperature, wind, precipitation). The G-Score weights those inputs against decades of golf-specific playability outcomes and produces a single comparable number across courses, regions, and seasons.
How often is the G-Score updated?
Daily. The underlying weather data is sourced from OpenWeather One Call 3.0 and refreshed every 24 hours. For tournament-grade hourly precision, check the per-course dashboard.
Try It on a Course
See the G-Score live for any of our marquee championship and destination courses, or search for your home course.
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