Seattle Weather in March

🇺🇸 United States

11°C

High

3°C

Low

Rain Days

Sunshine

65%

Humidity

North America › 🇺🇸 United States › Seattle

Updated: March 2026

Is March a Good Time to Visit Seattle?

3/10

Avoid

March is a avoid time to visit Seattle (3/10). With 8 daily sunshine hours and only 18 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 7th sunniest of the year in Seattle. March suits travellers visiting for indoor culture, food, and architecture rather than outdoor activities. Pack accordingly for 18 potential rain days. April offers a similar profile at lower hotel rates if dates are flexible. Watch out for prolonged rain stretches: with 18 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 February:9°C avg high

Seattle in March rewards travelers with average highs of 11°C and overnight lows around 3°C. Expect around 18 rainy days, so a compact umbrella is worth carrying. With 8 daily sunshine hours on average, conditions are cool and bracing, well suited for active days on foot.

11°C

Avg High

3°C

Avg Low

18 days

Rain Days

Sunshine

65%

Humidity

Temperature in Seattle in March

The 8°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 16 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 52°F average high, 37°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in March

Monthly Precipitation (mm)

What to Wear in Seattle in March

Morning3°CBefore the day warms up

Afternoon11°CPeak daytime temperature

Evening6°CAfter sunset cools down

Packing for Seattle in March means dressing for 11°C days and 3°C evenings. Layering is key: a thermal base, mid-layer fleece, and a windproof outer jacket for 11°C highs that feel colder in the wind. Evening temperatures settle at 3°C, a modest 8°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 18 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 March

March 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 March

Based on 11°C average highs and 18 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 March

Vigorous walking tour of the UNESCO heritage districtMidday (12-2pm)The 11°C peak temperature provides ideal conditions for brisk sightseeing walks
Cycling the riverside or park circuitAfternoon (1-4pm)Cool dry air makes long cycling sessions comfortable without overheating
Explore hilltop viewpoints and fortressesMorning for clear viewsCold-weather atmospheric clarity gives the longest sightlines of the year
Open-air Christmas or seasonal marketsAfternoon into eveningCool temperatures make festive outdoor markets genuinely atmospheric
Spend a morning in the national or city art museumOpens at 10am; arrive earlyWith 18 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 morningMarch 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 cool in March?

March marks the transition into warmer conditions in Seattle, as the sun angle climbs and day length extends. Temperatures averaging 11°C by day and 3°C overnight reflect a city shaking off winter: the morning air still carries a cool edge, but afternoons are noticeably warmer than even four weeks prior. At 48 degrees north latitude, spring is one of the most dynamic periods in the annual cycle, with weekly temperature changes that can be larger than the month-to-month shifts of summer. This volatility is part of the appeal: Seattle in March has a freshness and energy that peak-summer heat tends to mute. Layers remain essential, but there are reliable pockets of warmth that reward patience. 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 March

In March, Seattle experiences average highs of 11°C (52°F) and lows of 3°C (37°F). Expect around 18 rainy days and 8 hours of sunshine per day, with humidity averaging 65%. The 8°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 18 rainy days in March, with total precipitation of around 136mm. This is a notably wet period. A waterproof jacket or compact umbrella is essential, and it is worth building indoor alternatives into your daily itinerary for the inevitable rainy stretches. For context, the driest month in Seattle typically sees 4-6 fewer rain days than March.

Pack a warm jacket, sweaters, and layering pieces for Seattle in March. Temperatures can drop to 3°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 18 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.

March is a reasonable time to visit Seattle. Expect 18 rainy days, so pack a light rain layer for flexibility. Average temperatures of 11°C make outdoor exploration comfortable during the dry periods. With 8 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 March is 11°C (52°F), and the average low is 3°C (37°F). The mean daily temperature is approximately 7°C (45°F). The day-to-night range of 8°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.

March is shoulder or low season in Seattle, meaning fewer tourists and generally lower prices than peak months. With 8 sunshine hours and 18 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 March, Seattle suits a range of activities thanks to cool conditions around 11°C. With frequent rain, indoor activities and covered attractions are a smart choice. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 8 hours of sunshine, parks and waterfront walks are particularly enjoyable.

March ranks 7th sunniest of the year in Seattle, with an average 8 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 3°C into April. Compared to last month (February: 9°C high, 14 rain days), March is warmer and wetter. March 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

Other Months in Seattle

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Seattle

Best Time to Visit Seattle Seattle vs Vancouver in March

Data Sources for Seattle

Seattle on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.