Seattle · AutumnMonth summary
Seattle weather in September
✅ Good
🌡️ Temperature min / max
55°F – 68°F
🌧 Rainy days
31% of days
☀️ Sunshine
10.3h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.4/10
📅 📅 Best month
July (9.2/10)
Quick decision
Should you visit Seattle in September?
✅ Good
✅ Yes if: you want to explore the city on foot without suffering from heat.
❌ No if: you're looking for a beach destination — water and air are still cool.
Our take: Favourable conditions in September (7.4/10). July scores higher but the gap is small.
By trip type
Seattle in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ⚠️ Possible
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
Autumn in Seattle is often underrated: 20°F, golden light and declining crowds. An interesting window. Expect rain on 31% of days — a light raincoat in the bag is recommended. Not the best window, but acceptable if dates are constrained. July (9.2/10) is significantly better if possible.
Browse by month
All months for Seattle
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌦️ January | 37°F | 46°F | 58% | 0.2in | 4.3h | 1.7/10 |
| 🌦️ February | 36°F | 46°F | 55% | 0.2in | 5.5h | 2.5/10 |
| 🌦️ March | 39°F | 52°F | 52% | 0.1in | 8.4h | 4.2/10 |
| 🌦️ April | 43°F | 55°F | 47% | 0.1in | 10.4h | 5.3/10 |
| 🌤️ May | 48°F | 64°F | 35% | 0.1in | 11.9h | 7.2/10 |
| 🌤️ June | 54°F | 68°F | 28% | 0.1in | 13.0h | 7.7/10 |
| 🌤️ July | 57°F | 75°F | 11% | 0.0in | 14.5h | 9.2/10 |
| 🌤️ August | 59°F | 75°F | 16% | 0.0in | 12.9h | 8.7/10 |
| 🌤️ September | 55°F | 68°F | 31% | 0.1in | 10.3h | 7.4/10 |
| 🌦️ October | 48°F | 59°F | 45% | 0.2in | 7.5h | 5.0/10 |
| 🌦️ November | 43°F | 50°F | 59% | 0.2in | 4.7h | 2.3/10 |
| 🌦️ December | 37°F | 46°F | 60% | 0.2in | 3.5h | 1.4/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Seattle averages 68°F, 31% rainy days and 10.3h of sunshine per day. Overall weather score: 7.4/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 9.2/10). Difference:
- 🌡️ Max temperature : +4°F
- 🌧 Rainy days : -20%
- ☀️ Sunshine : +4.2h/day
FAQ
FAQ — Seattle in September
Is September a good time to visit Seattle?
September is an acceptable time for Seattle (score 7.4/10). Conditions are decent but not optimal — consider July (9.2/10) if possible.
What to do in Seattle in September?
With 68°F max and 10.3h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Seattle
Guided tours, skip-the-line tickets and local experiences.
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Flights
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