Highest temperature in Los Angeles on July 12?

Platform comparison

Market context

Los Angeles International Airport is expected to record a high near 75°F on 12 July 2026, with marine layer fog and patchy cloud cover suppressing any heatwave potential. The crowd-implied probability of a YES outcome sits at 0%, reflecting near-total consensus that temperatures will remain well below the threshold required for a payout. This aligns with historical July patterns at KLAX, where daily highs typically hover around 73°F, rarely exceeding 79°F, and only occasionally spiking into the 90s during rare heat events like the summer record of 92°F noted in recent years[1][3].

Traders should monitor the National Weather Service’s 7-day forecast updates and Wunderground’s real-time hourly data for KLAX, as any sudden breakdown of the marine layer could trigger a rapid temperature rise. However, current NWS guidance points to mostly cloudy conditions with a high near 76°F and persistent fog before 11pm, reinforcing the 0% market pricing[5]. With no announced heat advisories or extreme weather forecasts for mid-July in the region, the contrarian angle offers little value unless a sudden atmospheric shift occurs. The favourite remains the cool, stable coastal regime, leaving underdog bets on extreme heat as poor value at present.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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.