Highest temperature in Seattle on July 16?

Platform comparison

Market context

Seattle-Tacoma International Airport is expected to record a peak temperature on 16 July 2026 that falls squarely within the 64–65°F range, a outcome the market now treats as virtually certain. Historical mid-July data for the region typically sees highs in the upper 60s to low 70s, yet the current consensus has collapsed all uncertainty into this narrow two-degree bin, assigning it a 100% implied probability [1]. This extreme concentration leaves the 66–69°F cluster as the only nearby alternative with meaningful backing at roughly 38.5%, while outcomes below 61°F or above 70°F are effectively priced out at 0% [1].

For a handicapper, the 64–65°F favourite is so heavily entrenched that the only potential value lies in a contrarian angle on the 66–69°F underdog, which offers a statistical buffer against a slightly warmer-than-average day. Traders should monitor the Pacific Northwest’s high-pressure ridge strength and any incoming marine layer disruptions, as these are the primary catalysts that could push temperatures beyond the consensus range. While no specific weather announcements have been issued for this future date, the settlement relies entirely on Wunderground’s daily record for KSEA, meaning any data anomaly or station calibration issue would be the sole non-weather risk [1]. The current crowd-implied probability of 0% for any outcome outside the 64–65°F bin suggests the market has already priced in a stable, cool summer pattern typical of recent years.

Sources: 1

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.

FAQ

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 2026. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.