The 108th PGA Championship tees off May 11–17 at Aronimink Golf Club in Newtown Square, Pennsylvania — and weather could play a major role on Donald Ross's classic layout. Here's what the forecast models are showing and what spectators and bettors should watch for.
Aronimink's Weather Profile
Aronimink sits at roughly 400 feet of elevation in the suburbs west of Philadelphia. Mid-May in Newtown Square typically brings highs in the low-to-mid 70s°F with overnight lows near 53°F — comfortable golf weather, but not without risks.
The Philadelphia region averages a 39% chance of rain on any given May day, and afternoon thunderstorms are the primary threat. Unlike links courses where steady wind is the challenge, Aronimink's tree-lined fairways can shelter players from moderate breezes — but those same trees trap humidity, making the air feel heavier than the thermometer suggests.
Average May wind speeds in the area run around 11 mph, enough to affect approach shots on exposed holes but not enough to fundamentally change strategy the way a coastal major would. Gusts into the upper teens are possible, particularly ahead of afternoon storm cells.
What History Tells Us
The last time a major championship visited Aronimink's corridor in mid-May, players dealt with a mix of warm sunshine and isolated rain delays. The Delaware Valley's position between the Appalachian foothills and the Atlantic coast creates a microclimate where conditions can shift quickly — sunshine in the morning, a thunderstorm cell by 3 PM, and clear skies again by the time the leaders finish.
Humidity is the hidden factor. At 76% average relative humidity in May, the ball won't fly as far as the temperature alone would suggest. Players coming from dry-air Tour stops out West may find their distances slightly compressed.
Key Weather Factors for Scoring
Temperature (highs 68–78°F expected): Near-ideal for scoring. At these temps, ball flight is close to baseline — expect minimal temperature-related distance changes. The Ross greens at Aronimink will hold approach shots well in moderate conditions.
Wind (8–15 mph, variable): With Aronimink's hardwood canopy providing shelter on many holes, wind becomes a factor primarily on the more exposed back-nine holes. Players who can control trajectory through the trees will have an advantage.
Rain probability (~35–40% daily): The most likely disruption. Afternoon thunderstorms could trigger weather delays, and a soaked Aronimink plays significantly longer. Wet conditions soften the already receptive greens but make the thick rough even more punishing.
Humidity (70–80%): The sneaky variable. High humidity reduces ball carry by a few yards compared to dry conditions at the same temperature. This matters most on long par-4s and approach shots into Aronimink's elevated, well-bunkered greens.
Hour-by-Hour Matters at Majors
At a major championship, tee times span from early morning to mid-afternoon. Early starters (7–9 AM) will likely see temperatures in the mid-50s to low 60s with calm winds and dew on the greens — softer, more receptive conditions. Afternoon groups face the warmest temperatures and the highest storm risk but also firmer, faster greens as the sun dries the surface.
This early/late split has historically influenced major championship outcomes. Keep an eye on whether the draw favors certain players with better weather windows.
Track the Forecast Live
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