The Problem With Standard Weather Apps for Golf
The standard weather app on your phone is built for picnics. It tells you the temperature, the chance of rain, and maybe a wind icon. None of that translates directly into can I play golf today and shoot near my handicap?, which is the only question a golfer wants answered before booking a tee time.
The G-Score is a single number, 0 to 100, that does the translation for you. One number, every course on this site, every day. Higher is better. The rest of this post explains exactly what the number means, what feeds the calculation, and how to use the score to plan a round.
If you only read one section, read “The 0–100 Scale, by Band”. That is the practical interpretation that converts the number into a decision.
The 0–100 Scale, by Band
The G-Score range is divided into five practical bands. Each band tells you something specific about the day on course.
90–100: Postcard Day
Mild temperature, light wind, dry conditions, comfortable humidity. These are the days you remember. Book it. A score in the high 90s means premium playability across the board: the variables are all on your side, and weather is not the limiting factor on your scorecard. Tour-caliber conditions for the recreational golfer.
80–89: Strong Day
One small compromise, otherwise excellent. Maybe the wind is sustaining 8–10 mph, or the temperature is sitting at 84°F instead of the optimum 70°F. You can still post a real score; you just need to be slightly more deliberate with club selection. This is the meat of the playable range and represents the majority of high-G-Score days at courses like Pebble Beach in shoulder season or Augusta National in early spring.
70–79: Good With Adjustments
Two variables in play, or one variable getting noticeable. Wind 12–15 mph, or a 30–40 percent rain chance late in the round, or temperature outside the comfort band. You should still play if the round is on the calendar, but you need to read the dominant variable and adjust strategy. If wind is the issue, club up and aim wider; if heat is the issue, see our summer survival guide.
55–69: Compromise Day
One variable is dominating the day. Wind sustained over 18 mph, or rain probability past 60 percent, or temperature far outside the comfortable range. The G-Score is signaling that conditions will affect your scoring. Casual play is still fine and arguably more memorable; a tournament round or a serious score-chasing session is better moved to another day if you have flexibility.
0–54: Skip If You Can
Multiple variables hostile, or one of them at a safety threshold. Active rain, lightning risk, sustained gusts above 25 mph, freezing or oppressive heat. The G-Score is not telling you that golf is impossible. It is telling you that scoring will not represent your game and that physical comfort, equipment, and safety will dominate the round. Reschedule if you can.
What Goes Into the Number
The G-Score is computed from five weighted inputs. The full formula is documented on our methodology page. Here is the short version of what each input does and why it matters.
Wind Speed and Gusts (Heaviest Weight)
Wind is the single most-weighted input because it affects every shot, not just the long ones. Sustained wind above 10 mph begins suppressing the score. Above 25 mph, the score drops 40 points and ball flight becomes the dominant variable on every full swing. We covered the physics in detail in our PGA Tour wind strategy piece, and the architecture-and-wind interaction at America’s windiest golf courses.
Temperature and Feels-Like (High Weight)
The optimum temperature 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. We use the feels-like temperature, which factors in humidity and wind chill, because that is what your body actually experiences on the 14th hole. Read our deep dive on the feels-like temperature physics if you want the full breakdown.
Precipitation and Storm Risk (Heavy Weight, 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. We treat precipitation differently from the other inputs because it converts golf from “playable with adjustment” to “not really playable” faster than any other variable. Our rain probability piece walks through the math hour by hour.
Cloud Cover and UV Index (Light Weight)
Mild 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. UV is rarely the dominant variable on its own, but on a 95-degree summer day in Arizona it compounds with heat to push the score down faster than the temperature alone would suggest.
Air Density: Humidity Plus Pressure (Light Weight)
Counter to intuition, humid air is slightly less dense than dry air, marginally extending ball flight. Combined with barometric pressure and altitude, this becomes meaningful on long irons. Our altitude post explains why a 7-iron carries 12 yards farther in Denver than at sea level. The G-Score factors altitude in for every course.
Reading a Real G-Score: Worked Examples
Numbers without context are abstract. Here are three real G-Score readings and how to act on them.
Example 1: 88 at Pebble Beach in May
Mid-spring on the Monterey Peninsula. Temperature 62°F, wind 8 mph from the west, zero rain probability, light marine layer. The G-Score lands at 88 because the wind is a small subtraction from the otherwise ideal weather. Action: book it, but check the hourly forecast — Pebble Beach’s afternoon wind on the cliff holes (especially 7 and 8) often jumps 5–10 mph between 1 and 4pm, so a morning tee time will play closer to a true 90+ experience.
Example 2: 65 at Bethpage Black in October
Late autumn, Long Island. Temperature 52°F, wind sustained 18 mph from the northwest, 25 percent rain chance late in the round. The score lands at 65 because two variables are pushing simultaneously. Action: playable but expect strokes to come from the wind. Bethpage Black already plays as the toughest public muni in America; on a 65-G-Score day, the back-tee setup will eat the average golfer alive. Move forward a tee box, club up two on every approach, and stay patient.
Example 3: 38 at Whistling Straits in July
Summer afternoon on Lake Michigan. Temperature 81°F, wind sustained 22 mph with gusts to 32, 60 percent thunderstorm probability between 2 and 5pm. Action: reschedule. Whistling Straits is exposed by design and the wind alone would push the score under 50; with the thunderstorm window, the score is below 40 because lightning risk dominates. Play tomorrow morning instead.
Using the G-Score With Tee Time Selection
The single highest-leverage use of the G-Score is choosing when to play, not whether to play. On a typical day, the score moves 10–20 points between the morning and afternoon windows. We documented this with hourly data in our morning vs afternoon tee times analysis: morning rounds score 8–12 G-Score points higher on average across the United States.
The Three-Step Pre-Round Workflow
1. Pull the 7-day forecast for your course. Every course page on this site shows a 7-day G-Score grid. Identify the highest score in your available window.
2. Pull the hourly view for that day. The dashboard breaks the day into hourly G-Score readings. Pick the highest contiguous 4-hour block — that is your ideal tee time.
3. Cross-check the dominant variable. Click into the day and look at what is driving the score. If wind, expect direction shifts. If heat, plan hydration and sun protection. If rain, watch the radar 30 minutes before tee time. Our tour caddie math walks through how tour caddies handle each variable in real time.
What the G-Score Is Not
A few clarifications because we get this question a lot in the inbox.
The G-Score is not a course difficulty rating. Slope and course rating measure how hard the course plays for a scratch versus bogey golfer in standard conditions. The G-Score measures how the conditions on a specific day affect playability. A 90 G-Score at Pinehurst No. 2 is still a hard course; a 50 G-Score at your home muni is still your home muni, just harder than usual.
The G-Score is not a tee time recommendation engine. It is a single number you can compare across courses and days. The recommendation comes from you matching the number to your priorities — competitive round, casual round, beginner outing, family day.
The G-Score is not predictive of your individual round. It is descriptive of the conditions. A scratch golfer at 70 G-Score will probably outscore a 20-handicap at 90 G-Score. The G-Score levels the conditions, not the golfers.
Common Mistakes Golfers Make Reading the Score
Treating 70 as “bad”
A 70 G-Score is a perfectly playable round. Most rounds played in the United States happen between 65 and 80 G-Score because the country’s climate produces those conditions far more often than the postcard 90+ days. Calibrate your expectations to your actual climate. California coastal courses live in the 80–95 range year-round; Wisconsin courses live closer to 65–85 for their playable months. Both are legitimate windows.
Ignoring the dominant variable
Two days can both score 70 for completely different reasons. A 70 driven by wind plays differently from a 70 driven by heat. The dominant variable, not the score itself, tells you what to gear up for and how to manage the course. Always look past the headline number.
Comparing scores across distant climates without context
A 75 in Florida in February and a 75 in Wisconsin in June are different days even with the same number. The Florida score is probably bounded by humidity; the Wisconsin score is probably bounded by wind. The score is comparable, but the lived experience inside it is not.
Forgetting that the score updates every hour
The score is not a static daily number. Wind shifts, fronts pass, the rain window opens and closes. We refresh the score every hour for every course on the site. If you booked a tee time at 6am for a 1pm round and the score has dropped from 80 to 60 by 11am, the call to reschedule is reasonable. The forecast was good when you booked; it is not good now.
FAQ
What is a good G-Score for casual play?
Anything 70 or above is straightforward casual play. Below 70 is still playable; you are just trading some scorecard quality for the round itself. We would not cancel a casual round above 55 unless the dominant variable is rain or storm risk.
What is a good G-Score for tournament rounds?
Most tournament players want 75+ to feel that conditions are not the story of the day. Below 70, expect tournament golf to read more like a survival round than a scoring round — which can be its own discipline. The 2018 U.S. Open at Shinnecock famously played at sub-50 G-Scores on Saturday afternoon and produced winning scores in the +10 range.
How is the G-Score different from the “feels-like” temperature?
Feels-like is one input into the G-Score. Feels-like answers “how comfortable will I be standing in this air?” The G-Score answers the broader question “how playable is golf in this air?” Feels-like is a piece of the puzzle.
How often does the G-Score update?
Every hour for every course tracked on the site. We pull weather data from OpenWeather One Call 3.0 and recompute. The 7-day forecast is updated daily; the hourly is updated hourly.
Why does my home course show a different G-Score than the course 10 miles away?
Microclimate. A coastal course 10 miles inland from a beach course often loses 10–15 G-Score points in summer because the marine layer doesn’t reach. Elevation, wind exposure, and proximity to large water bodies all shift the local weather meaningfully even at short distances.
Putting It All Together
The G-Score is a tool. The number gives you a quick read on whether to play, when to play, and how to gear up. The bands give you the action: postcard, strong, good with adjustments, compromise, skip.
The next time you check the weather before a round, instead of asking “what’s the temperature” ask “what’s the G-Score, what’s the dominant variable, and what’s the highest-score window in the next 48 hours?” Three questions, three numbers, ten seconds. That is the workflow.
Want to see the formula? Read our methodology page. Want to see which states deliver the most postcard days per year? See best golf weather states. Ready to plan your next round? Search for your course on the homepage and pick a tee time window from the 7-day grid.