September in Seattle, WA: shoulder season for golf — playable with smart tee time selection. Best tee times: mid-morning through early afternoon.
| Average September Weather | |
|---|---|
| Avg daily high | 70°F |
| Avg daily low | 56°F |
| Rainy days | 11 / mo |
| Avg peak wind | 11.2 mph |
September's numbers translate directly to cleaner golf than most Seattle months deliver. An average high of 70°F sits right in the middle of the ideal 60–80°F window, the low of 56°F means even morning tee times stay playable, and the 14°F daily swing is modest enough that one extra layer handles the whole round. At 11 precipitation days, September is the third-driest month of the year, so roughly two out of every three days you're not dealing with rain at all. Wind peaks at 11.2 mph — tied for the calmest ranking in Seattle's annual calendar — which means approach shots aren't getting knocked offline and putts on exposed coastal layouts are reading truer.
What does that mean scorecard-to-scorecard? Firm, draining fairways (summer's heat dries the turf through August), consistent ball flight in light air, and comfortable afternoon temperatures around 70°F. Handicaps who struggle in wet, heavy conditions often post their best Seattle numbers in September precisely because the course is playing fast and the wind is quiet.
Because September is one of Seattle's most playable months and daylight remains extended through mid-month, afternoon weekend slots book out fast — reserve at least 10–14 days out for Saturday and Sunday rounds. Midweek morning tee times remain easier to grab and often come with softer pricing before courses fully reprice for the fall shoulder period. See how conditions rate hour by hour on our playability scale.
August edges September by 6°F on the high (76°F vs. 70°F) and carries three fewer precipitation days, so it's modestly drier and warmer, though both months share the same peak wind at 11.2 mph. The drop into October is sharper: highs fall another 10°F to 60°F, rainy days jump by five to 16, and wind ticks up to 12 mph — a meaningful shift toward heavier, slower conditions. September sits closer to summer's end than to autumn's onset, which is why it plays better than its shoulder-season badge might suggest.
Climate normals show the long-term picture, but day-to-day weather varies. Check today's live golf weather score for Seattle, WA for the current playability rating, hourly wind, temperature, and the recommended tee time window.
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Yes — September is the third-driest month of the year with only 11 precipitation days, an average high of 70°F, and peak wind of just 11.2 mph, which is tied for the calmest in Seattle's annual calendar. Compared to October's 16 precipitation days and 60°F average high, September offers noticeably more reliable conditions and warmer temperatures for a full round. It's one of the strongest months on the calendar for a full-day golf trip.
The shift is noticeable: average highs drop 10°F from 70°F in September to 60°F in October, and precipitation days increase by five — from 11 to 16 — meaning nearly half of October days have some measurable rain. Wind also picks up slightly, rising from 11.2 mph to 12 mph. Golfers who can schedule flexibility should lean toward September rather than waiting for October.