Seattle's weather on May 19, 2026 will be recorded and compared against this narrow temperature window. The current 0% odds reflect trader conviction that the high temperature will fall outside the 50-51°F range entirely. Mid-May in Seattle typically sees highs in the mid-to-upper 60s Fahrenheit, with increasing sunshine as the region transitions into summer. A high of only 50-51°F would represent unseasonably cool conditions, occurring perhaps 5-10% of the time based on historical records spanning decades. The specificity of this narrow range makes it statistically unlikely compared to the broader probability distribution of May 19 temperatures. The market's 0% pricing suggests near-certainty that Seattle will be either cooler, which would be unusual for late spring, or warmer, which is the more probable scenario given seasonal warming trends. Weather prediction markets like this resolve based on official National Weather Service recordings from Seattle-Tacoma International Airport, making the outcome verifiable and objective. The modest trading volume indicates limited interest in this highly specific daily weather outcome.
What factors could move this market?
Seattle's climate in May transitions between spring and early summer, with high temperatures typically ranging from 62°F to 72°F based on historical records spanning the past century. The city experiences increasing daylight hours and solar radiation, though maritime influence from Puget Sound moderates temperature swings. A high of 50-51°F would be approximately 12-20°F below the median for May 19, representing a distinctly cool and likely cloudy day with reduced solar forcing. This outcome would typically result from a strong marine layer or weak low-pressure system bringing cool air from the north Pacific. Historically, temperatures this cool in late May occur perhaps once every 10-15 years in Seattle, often coinciding with unseasonably strong troughs of low pressure aligned with the Pacific Northwest. The factors that could push toward a YES outcome include active weather systems from the north Pacific delivering colder air masses, persistent marine cloudiness preventing solar heating, and upper-level atmospheric patterns steering cool maritime air inland. Early morning lows from the previous night could limit daytime heating potential if clear skies prevail. Conversely, factors strongly supporting a NO outcome include the statistical baseline—50-51°F is well below the seasonal norm—the typical strength of May solar forcing in the Northern Hemisphere, Seattle's latitude at 47.6°N, and the increasing predictability of warm conditions by mid-month as sea surface temperatures rise and the jet stream retreats northward. A high of 55-60°F is far more plausible than this narrow window, and anything in the upper 60s or 70s would dramatically exceed it. The 0% odds reflect rational market pricing: traders assess the probability as vanishingly small, likely less than 1% relative to competing outcomes. The lack of trading activity and extreme odds compression indicate this market attracts only niche weather enthusiasts. Recent seasonal trends from 2024-2025 show May temperatures in Seattle have skewed warmer than historical averages due to broader climate patterns, making cool extremes even less likely. Currently, major weather models show no signals suggesting such a cool event.
What are traders watching for?
Official National Weather Service maximum temperature reading from Seattle-Tacoma Airport on May 19
Extended forecast models (GFS, NAM, ECMWF) issued through May 19 for Pacific Northwest
Upper-level pressure patterns and any significant troughs affecting the Seattle region
Actual high temperature outcome: competing ranges from 40s through 70s+
How does this market resolve?
Market resolves on May 19, 2026 based on the official National Weather Service maximum temperature reading for Seattle-Tacoma International Airport. YES wins if the high temperature is exactly 50-51°F; all other outcomes resolve NO.
Polymarket Trade is an independent third-party interface to the Polymarket CLOB prediction market exchange on Polygon — not affiliated with Polymarket, Inc. Prediction markets aggregate trader expectations into real-time probability estimates. 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. Polymarket Trade is non-custodial — your funds never leave your wallet. Open the full interactive page linked above to place orders, see order book depth, and execute a trade.
