The US Open runs through the tail end of a New York summer — hot and humid rather than genuinely dangerous, but the humidity is the part most visitors underestimate. Late August afternoon highs typically sit in the low-to-mid 80s°F, cooling to upper 70s by early September, with overnight lows in the mid-to-upper 60s.
Typical conditions
The roof gap — Ashe vs. Armstrong
Arthur Ashe and Louis Armstrong Stadiums both have retractable roofs, but they are not equally weatherproof. Armstrong's roof, added in 2018, is naturally ventilated by design, with intentional gaps left for air circulation — functional for cooling, but it means rain can genuinely blow in sideways during a hard storm, which happened during Hurricane Ida's remnants in 2021 and forced a match to relocate to Ashe mid-way through. Ashe's roof seals more completely. The outer courts have no roof at all, so real rain stops play there outright until it clears.
What to pack
Clothing
Breathable, lightweight layers for the humidity. A cap or sun hat for outer-court days with little shade. Comfortable, broken-in walking shoes — the grounds cover real distance, and a night session runs noticeably cooler than the day.
Wet weather
A compact umbrella — closed during play, since the US Open's guest code prohibits holding one open during a point. A light rain jacket for an outer-court day with no roof overhead.
On the grounds — what's allowed
Bags are capped at 12"W x 12"H x 16"L, one per guest, with backpacks barred (very limited exceptions). Metal or plastic water bottles up to 24oz are the one real exception — bring one rather than buying water repeatedly across a long, humid day.
The figures above are seasonal norms, not a forecast — check a live forecast once you're within range of your travel dates.
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