Seattle's weather on May 18, 2026 is the subject of this highly specialized prediction market focused on a narrow temperature band between 46 and 47 degrees Fahrenheit. The extraordinarily low 1% odds reveal trader conviction that May in Seattle typically produces milder conditions. The city's Pacific maritime climate normally brings May highs in the 55-65°F range, making a reading below 50°F statistically uncommon for mid-May. This precise, measurable outcome will resolve definitively based on the National Weather Service official high temperature recorded for Seattle-Tacoma airport, ensuring straightforward verification. The market's extreme odds suggest traders regard this temperature window as unlikely given seasonal norms, unless an unusual cold front or weather system moves through the region during this specific 24-hour window. Current liquidity of $2,600 and minimal trading volume reflect the niche nature of this specialized forecast.
Deep dive — what moves this market
Daily temperature prediction markets focus on meteorologically precise outcomes that resolve definitively through official records. Seattle's climate, shaped by its Pacific maritime position and ocean moderating influences, typically prevents extreme temperature swings in May. Historically, the city rarely experiences May highs below 48°F unless a strong cold front from Canada pushes into the region—an increasingly infrequent occurrence as spring transitions into early summer. The specific 46-47°F window represents a temperature roughly 10-15 degrees below typical May averages for the city, suggesting either an unusually delayed spring cold snap or a transient Arctic air mass intrusion requiring substantially more hostile meteorological conditions than seasonal norms provide. Factors that could theoretically push outcomes toward YES resolution include a lingering polar vortex disruption, a deep low-pressure system migrating up the Pacific coast, or unusual upper-level wind patterns steering cold air southward. Conversely, factors strongly favoring NO include the seasonally weakening cold source regions in the Arctic, warming Pacific Ocean temperatures through May, and the increasing solar angle characteristic of late spring in the Northern Hemisphere. The 1% odds traders have assigned signal extreme skepticism about this outcome's likelihood—a judgment grounded in climatological understanding that such below-normal May readings are atypical for Seattle. Recent years' May weather patterns consistently show mild, not cool, conditions. A trader assessing this market would need to weigh seasonal expectations, ensemble forecast model guidance from multiple agencies, and the typical trajectory of spring warming progression against the specific narrow range required for resolution. The market's structure—requiring a high within a single degree Fahrenheit—introduces sensitivity to rounding conventions, forecast precision, and exact official temperature recording methodology used by the National Weather Service.
What traders watch for
May 18 National Weather Service official high temperature reading for Seattle-Tacoma airport
Forecast model guidance from GFS, NAM, and other systems through market close on May 18
Any late-spring cold front or low pressure system track changes into the Pacific Northwest
Historical May temperature patterns and climate anomalies recorded for Seattle coastal regions
How does this market resolve?
Market resolves based on the National Weather Service official high temperature for Seattle-Tacoma on May 18, 2026. YES if recorded high falls between 46-47°F inclusive; NO otherwise.
Prediction markets aggregate trader expectations into real-time probability estimates. On Polymarket Trade, every market question resolves YES or NO based on a specific event outcome; traders buy shares of the side they believe will resolve positively. Prices range 0¢ (certain no) to 100¢ (certain yes) and naturally reflect the crowd-implied probability of YES. This page summarizes the market state for readers arriving from search; for live trading (place orders, see order book depth, execute a trade) open the full interactive page linked above.
