Highest temperature in Los Angeles on August 17?

Platform comparison

Market context

Los Angeles’s temperature on 17 August is the key driver here, with the official market tied to the highest reading at Los Angeles International Airport rather than the broader “day high” summary. The current crowd-implied probability is 0% for the YES side, which is notably lower than the weather-facing signals: Wunderground showed Los Angeles at 89°F by late morning on 17 August, while the National Weather Service’s daily climatology puts the record maximum for that date at 89°F, making the upper band a live question rather than a remote tail event.[13][14]

For comparison, late-summer Los Angeles routinely posts highs in the upper 80s, but the distribution is sensitive to marine layer depth, inland heat spill-over and onshore flow. Forecasts issued around 17 August pointed to warmer and drier conditions away from the immediate coast, with heat advisories affecting much of Southern California and downtown Los Angeles projected near 91°F later in the week, suggesting the broader pattern was supportive of above-normal readings.[2][7][9] That makes the contract’s range selection more about whether LAX reaches the high-80s or stays a degree or two lower than about a major weather surprise.

Traders should watch the exact LAX observation series through the settlement window, since this market resolves off the Daily Observations table and not the headline daily high/low box. The main catalysts are the midday sea-breeze timing, any late-afternoon warming burst, and whether coastal influence caps the airport reading below the nearest bucket boundary; with heat alerts in effect regionally, the risk is skewed toward an outcome near the observed high-80s range rather than a mild day well below seasonal norms.[8][9][14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Los Angeles on August 17? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.