Highest temperature in Los Angeles on July 9?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Los Angeles International Airport on 9 July 2026, with the market currently pricing the 76–77°F range at 0% probability. On Polymarket, this contract trades as a conditional token on the Polygon network, settled in USDC, where the crowd has effectively dismissed the lower temperature bracket despite typical July averages hovering near 85°F. Historical data for Los Angeles in July 2026 shows daily highs ranging from 79°F to 90°F, with overnight lows between 64°F and 71°F, suggesting that a peak of 76–77°F would be an outlier compared to the interior heat advisories forecasting 90–105°F for inland areas[1][3].

Traders should monitor the official heat advisory schedules issued by local authorities and the real-time Wunderground data feed that will resolve the market, as any sudden shift in coastal cloud cover could alter the temperature trajectory. Recent reports indicate a shattering heatwave across Southern California, with forecasts pushing temperatures into the 90s for the inland coastal plain, including downtown Los Angeles, which makes the 76–77°F range increasingly improbable as the settlement window approaches[3][5]. The resolution source is explicitly the highest temperature recorded for all times on that day at KLAX, meaning traders must watch for any unexpected weather model updates or announcements regarding marine layer persistence that might suppress daytime highs, though current trends favour significantly higher readings.

Sources: 1 · 2 · 3 · 4 · 5

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 PolyGram. 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram 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.