Seattle-Tacoma (KSEA) Temperature Market Guide

KSEA • Seattle-Tacoma International Airport

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Seattle-Tacoma International Airport (KSEA) offers temperature markets on both ForecastEx and Polymarket. Seattle experiences a mild, marine-influenced climate with rare temperature extremes.

Quick Facts

Station Code	`KSEA`
Location	Seattle, WA
Coordinates	47.4502°N, 122.3088°W
Elevation	433 ft (132 m)
Timezone	PT (America/Los_Angeles)
NWS Office	Seattle (SEW)
Resolution Source	NWS CLI Report ↗

About the KSEA Weather Station

The KSEA ASOS is located at Seattle-Tacoma International Airport in SeaTac, approximately 13 miles south of downtown Seattle. At 433 feet elevation, the station sits in the Puget Sound lowlands.

Seattle Climate & Temperature Patterns

Seattle experiences a marine west coast climate (Koppen: Cfb) with mild, wet winters and pleasantly warm, dry summers.

Key Climate Factors:

Pacific Influence: The Pacific Ocean keeps temperatures mild year-round.

Rain Shadow Effect: Seattle sits in a partial rain shadow of the Olympic Mountains.

Dry Summers: Unlike most of the U.S., Seattle's driest season is summer.

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Seasonal Trading Considerations

Winter (December - February):
Mild and wet with average highs in the mid-40s°F. Arctic outbreaks occasionally bring snow.

Spring (March - May):
Slowly warming with frequent clouds and showers.

Summer (June - August):
Pleasant and dry with average highs in the mid-70s°F. Heat waves are uncommon.

Fall (September - November):
Gradual cooling with increasing rain.

Seattle-Specific Trading Tips

Rare Extremes: Temperature extremes are rare but significant when they occur.

Summer Heat Potential: Pacific Northwest heat waves have intensified recently.

Arctic Outbreak Timing: When arctic air spills over the Cascades, it brings rare snow and cold.

Dual Platform: Verify resolution criteria for each platform.

Market Resolution Details

Seattle temperature markets resolve based on the official high temperature in the NWS CLI for station KSEA, issued by the Seattle forecast office (SEW).

Resolution Source: NWS CLI (Climatological Report)

Reporting Period: 12:00 AM to 11:59 PM Pacific Standard Time.

Data Release Schedule

Typical release times for key data products at KSEA. Times shown in UTC.

Data Type	Typical Time (UTC)	Variability
CLI Report Daily climatological summary	09:28 UTC	±4 min
24hr High METAR with max temp	07:53 UTC	±1 min
METAR Hourly observations	Hourly at :53	±0 min
DSM #1 Daily summary message	01:12 UTC	Issuance time
DSM #2 Daily summary message	16:32 UTC	Issuance time

6-Hour High/Low Reports

These METARs include 6-hour maximum and minimum temperatures, useful for tracking intraday temperature trends.

05:53 UTC

11:53 UTC

17:53 UTC

23:53 UTC

Note: Times are approximate and may vary. CLI reports are the official resolution source for temperature markets. See NWS Data Guide for more information.

Data Resources

Quick links to official data sources and tools for Seattle.

📊 NWS Data

🗄️ Iowa Environmental Mesonet

📈 Wethr.net Tools

Forecasting Challenges

Heat Wave Rarity: Because extreme heat is rare, models may struggle when it occurs.

Arctic Air Spills: Predicting when arctic air will spill over the Cascades is challenging.

Historical Temperature Records

Record High: 108°F recorded in June 2021 during the unprecedented heat dome.

Record Low: 0°F recorded in January 1950.

90°F+ Days: Seattle averages only 3-4 days per year at or above 90°F.

📡 Official Data Sources

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