Highest temperature in Seattle on August 16?

Platform comparison

Market context

On 16 August 2026, the highest temperature recorded at Seattle-Tacoma International Airport will determine which range this market settles into. The crowd currently assigns zero probability to any outcome, suggesting either extreme uncertainty or insufficient liquidity to establish pricing.

Seattle's August climate typically produces highs between 75 and 85 degrees Fahrenheit, with the airport station recording temperatures slightly warmer than downtown due to its location and surface characteristics. Historical data from the past two decades shows that temperatures exceeding 90°F on mid-August dates occur roughly once every five to seven years in the Seattle area, whilst readings below 70°F remain uncommon but plausible during marine air intrusions. The 0% implied probability reflects the market's nascent state rather than genuine forecasting consensus; comparable weather markets on established platforms usually show measurable probabilities across multiple temperature bands by the settlement window.

Traders should monitor the Pacific Northwest's atmospheric setup from early August onwards, particularly the position of high-pressure systems over the interior West and the strength of marine layer influence along the coast. The National Weather Service's extended forecasts, typically reliable 8–10 days out, will provide the first substantive signal. Any significant heat dome positioning over the region would shift expectations towards higher ranges, whilst persistent cool-season patterns would favour lower bands. Current market pricing reflects an absence of committed positions rather than genuine equilibrium, creating potential value for early movers once forecasts solidify in late July.

Methodology

This page reviews Highest temperature in Seattle on August 16? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Who Will Win, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.