Weather in Seattle 🇺🇸
Monthly weather averages & travel planning
October
Avg Temp
15°C
Rain Days
15 days
Sun Hours
7 hrs
Humidity
65%
North America › 🇺🇸 United States › Seattle
Updated: March 2026
Is October a Good Time to Visit Seattle?
4/10
Fair
October is a fair time to visit Seattle (4/10). With 7 daily sunshine hours and only 15 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 8th sunniest of the year in Seattle. October suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 15 potential rain days. November offers a similar profile at lower hotel rates if dates are flexible. Watch out for prolonged rain stretches: with 15 wet days, a fully outdoor itinerary is risky. Build in museum days and covered market visits as contingency. Planning tips: most accommodation categories have availability, and last-minute deals are common. The quieter streets and shorter queues can make this a genuinely enjoyable time to visit for the right type of traveller. Budget-conscious visitors will find the best value of the year in this period.
vs September:21°C avg high
Seattle in October rewards travelers with average highs of 15°C and overnight lows around 8°C. Expect around 15 rainy days, so a compact umbrella is worth carrying. With 7 daily sunshine hours on average, conditions are cool and bracing, well suited for active days on foot.
15°C
59°F
Avg High
8°C
46°F
Avg Low
15 days
129 mm total
Rain Days
7h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Seattle in October
The 7°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 59°F average high, 46°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Seattle in October
Morning8°CBefore the day warms up
Afternoon15°CPeak daytime temperature
Evening11°CAfter sunset cools down
Packing for Seattle in October means dressing for 15°C days and 8°C evenings. A mid-weight jacket over a sweater handles 15°C daytime temperatures; the combination stays comfortable all day without overheating. Evening temperatures settle at 8°C, a modest 7°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. With 15 rain days expected, a compact travel umbrella is worth the bag space. A waterproof jacket is better than an umbrella if you plan full-day outdoor routes.
Local tip: Seattle sees heavy rain periods where a compact travel umbrella can feel inadequate. A packable waterproof jacket offers better coverage for prolonged downpours and leaves both hands free for maps and cameras.
Events in Seattle in October
October has no major festivals or public holidays in Seattle, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Seattle in October
Based on 15°C average highs and 15 rainy days
- Warm jacket (down or fleece)
- Merino wool base layer (regulates temperature and resists odour)
- Sweaters and lined trousers
- Scarf and lightweight gloves
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Seattle in October
- Explore the old town's cobblestone backstreetsMorning (9-11am)At 15°C, conditions are pleasant for unhurried exploration on foot
- Visit hilltop viewpoints for panoramic city viewsLate afternoon (4-6pm)Low sun angle creates dramatic light for photography while temperatures remain comfortable
- Bicycle rental for a half-day city circuitMid-morning startMild 15°C temperatures are ideal for extended cycling without excessive effort
- Boat tour of the river, bay, or canal networkLate morning departureComfortable weather makes open-deck boats viable without wind-chill concerns
- Spend a morning in the national or city art museumOpens at 10am; arrive earlyWith 15 rain days expected, having a full-day indoor plan is practical insurance
- Cooking class focused on regional cuisineHalf-day sessions run 10am-1pm or 3-6pmIndoor activity that fills a rainy half-day with genuine cultural content
- Visit covered historical sites: cathedral, palace, or bazaarAny time; most crowded middayRoofed monuments and covered markets provide exploration without weather exposure
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningOctober brings distinct seasonal changes to public green spaces worth exploring
- Warm up with traditional hot dishes: local stew, fondue, or braised specialities at a neighbourhood restaurantLunch (12-2pm) or dinner (7-9pm)Cold-weather cuisine is a genuine cultural experience and the best local restaurants serve their heartiest dishes in cooler months
Why is Seattle mild in October?
October brings the first meaningful shift toward cooler conditions in Seattle, as the sun angle drops and day length shortens. Temperatures averaging 15°C by day and 8°C overnight are still comfortable by most standards, but the trend is clearly downward. At 48 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Evening temperatures already demand a jacket, but midday hours stay pleasant for sightseeing. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Seattle in October
In October, Seattle experiences average highs of 15°C (59°F) and lows of 8°C (46°F). Expect around 15 rainy days and 7 hours of sunshine per day, with humidity averaging 65%. The 7°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV index averages 6, so sun protection is advisable on clear days.
Seattle typically sees 15 rainy days in October, with total precipitation of around 129mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Seattle typically sees 4-6 fewer rain days than October.
Pack a warm jacket, sweaters, and layering pieces for Seattle in October. Temperatures can drop to 8°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 15 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.
October is a reasonable time to visit Seattle. Expect 15 rainy days, so pack a light rain layer for flexibility. Average temperatures of 15°C make outdoor exploration comfortable during the dry periods. With 7 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Seattle in October is 15°C (59°F), and the average low is 8°C (46°F). The mean daily temperature is approximately 12°C (53°F). The day-to-night range of 7°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Seattle is generally July. July offers the most sunshine at 13 hours per day and only 6 rainy days. Average temperatures reach 25°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around July gives you the best chance of dry, bright weather.
October is shoulder or low season in Seattle, meaning fewer tourists and generally lower prices than peak months. With 7 sunshine hours and 15 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In October, Seattle suits a range of activities thanks to cool conditions around 15°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 7 hours of sunshine, parks and waterfront walks are particularly enjoyable.
October ranks 8th sunniest of the year in Seattle, with an average 7 daily sunshine hours. The driest months are August, July, and September. July is the hottest month (25°C avg high); December is the coolest (7°C). From here, temperatures fall 5°C into November. Compared to last month (September: 21°C high, 8 rain days), October is cooler and wetter. October sits in the middle of the annual sunshine ranking for Seattle, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 8°C | 2°C | 18 | 4h | View |
| February | 9°C | 2°C | 14 | 6h | View |
| March | 11°C | 3°C | 18 | 8h | View |
| April | 14°C | 5°C | 16 | 10h | View |
| May | 18°C | 8°C | 13 | 11h | View |
| June | 21°C | 11°C | 10 | 12h | View |
| July | 25°C | 14°C | 6 | 13h | View |
| August | 25°C | 14°C | 5 | 12h | View |
| September | 21°C | 12°C | 8 | 10h | View |
| October | 15°C | 8°C | 15 | 7h | View |
| November | 10°C | 4°C | 18 | 5h | View |
| December | 7°C | 2°C | 18 | 4h | View |
January
18 rain days, 4h sun
8°2°
February
14 rain days, 6h sun
9°2°
March
18 rain days, 8h sun
11°3°
April
16 rain days, 10h sun
14°5°
May
13 rain days, 11h sun
18°8°
June
10 rain days, 12h sun
21°11°
July
6 rain days, 13h sun
25°14°
August
5 rain days, 12h sun
25°14°
September
8 rain days, 10h sun
21°12°
October
15 rain days, 7h sun
15°8°
November
18 rain days, 5h sun
10°4°
December
18 rain days, 4h sun
7°2°
Other Months in Seattle
Plan Your Trip to Seattle
Data Sources for Seattle
Climate normals represent 30-year averages (1991-2020). Individual years may vary.