Highest temperature in Los Angeles on August 17?

Platform comparison

Market context

Los Angeles International Airport on 17 August usually resolves in the low-to-mid 80s Fahrenheit, with WeatherSpark putting the typical August daily high around 84°F and the rare upper end near 93°F[12]. That makes a 0% YES price hard to justify unless a late-day spike is being missed; on a programmatic read, the useful check is the hourly and daily observation feed rather than headline city forecasts, because the market settles from the highest recorded station temperature, not the summary high. Historical August 17 records at LAX also show that the date can occasionally run much warmer, with the all-time figure for that day reaching 89°F[7].

The immediate catalyst is whether the coastal marine layer breaks early enough for inland warming to reach the airport site, or whether onshore flow keeps the station pinned below the high 80s. Recent coverage pointed to a Southern California heat advisory and a broader surge into the 90s and 100s inland, while downtown Los Angeles was only forecast near 91°F and LAX nearer 79°F on one update, illustrating how local station outcomes can diverge sharply from regional headlines[3][14]. For a power-user, the safest approach is to monitor the station-level observations through the afternoon and set any conditional order around the specific range buckets rather than the citywide narrative.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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.

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 Kalshi Fees 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.