Weather in Seattle 🇺🇸
Monthly weather averages & travel planning
June
Avg Temp
21°C
Rain Days
10 days
Sun Hours
12 hrs
Humidity
65%
North America › 🇺🇸 United States › Seattle
Updated: March 2026
Is June a Good Time to Visit Seattle?
6/10
Good
June is a good time to visit Seattle (6/10). With 12 daily sunshine hours and only 10 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 2nd sunniest of the year in Seattle. Culture-focused travellers and those who prefer lighter crowds will find June a practical choice, with prices running lower than peak July without sacrificing all the good weather. May offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Seattle's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs May:18°C avg high
Seattle in June rewards travelers with average highs of 21°C and overnight lows around 11°C. Expect around 10 rainy days, so a compact umbrella is worth carrying. With 12 daily sunshine hours on average, conditions are comfortable for sightseeing at a relaxed pace.
21°C
70°F
Avg High
11°C
52°F
Avg Low
10 days
59 mm total
Rain Days
12h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Seattle in June
The 10°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 10 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Winds are calm at an average 13 km/h, so wind-chill is not a factor in planning your clothing. In Fahrenheit: 70°F average high, 52°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 June
Morning11°CBefore the day warms up
Afternoon21°CPeak daytime temperature
Evening14°CAfter sunset cools down
Packing for Seattle in June means dressing for 21°C days and 11°C evenings. A light cotton tee with a casual overshirt works well at 21°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 11°C, a modest 10°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 10 potential rainy days.
Local tip: Layers are more practical than a single heavy garment in Seattle. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.
Events in Seattle in June
June 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 June
Based on 21°C average highs and 10 rainy days
- Light jacket or cardigan for cooler evenings
- Mix of short and long-sleeve layers
- Comfortable walking shoes with good arch support
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Seattle in June
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 21°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)June is reliably dry enough for rural day trips without weather risk
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningJune brings distinct seasonal changes to public green spaces worth exploring
- Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmJune seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Seattle mild in June?
June in Seattle reflects a mid-latitude climate pattern, with temperatures averaging 21°C by day and 11°C overnight. The city sits at 48 degrees north latitude, where the balance between solar radiation and heat loss drives conditions that are neither extreme nor static. Conditions occupy the comfortable middle band of the annual temperature range, where outdoor activity is feasible without the extremes of midsummer heat or midwinter cold. Day-to-night temperature variation of 10°C is moderate and manageable with a single mid-layer. 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 June
In June, Seattle experiences average highs of 21°C (70°F) and lows of 11°C (52°F). Expect around 10 rainy days and 12 hours of sunshine per day, with humidity averaging 65%. The 10°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 10, so sun protection is advisable on clear days.
Seattle typically sees 10 rainy days in June, with total precipitation of around 59mm. 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 June.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Seattle in June. Daytime temperatures of 21°C are pleasant, but the evening drop to 11°C means a jacket is essential if you plan to be out after dark. With 10 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, June is an excellent time to visit Seattle. With 12 daily sunshine hours and only 10 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 21°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Seattle in June is 21°C (70°F), and the average low is 11°C (52°F). The mean daily temperature is approximately 16°C (61°F). The day-to-night range of 10°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.
June is shoulder or low season in Seattle, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 10 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 June, Seattle suits a range of activities thanks to mild temperatures around 21°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 12 hours of sunshine, parks and waterfront walks are particularly enjoyable.
June ranks 2nd sunniest of the year in Seattle, with an average 12 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 rise 4°C into July. Compared to last month (May: 18°C high, 13 rain days), June is warmer and drier. June is among the top three sunniest months to visit Seattle.
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.