Highest temperature in Los Angeles on August 14?

Platform comparison

Market context

Los Angeles is tracking to a modest late-summer high, with Weather Underground showing 83°F at 10:04 AM PDT on 14 August and an earlier daily-observations readout at LAX sitting at 69°F before sunrise, so the market still depends on the afternoon run-up rather than the morning print. On Polymarket, that means the contract is priced on USDC against Polygon conditional tokens, but the settlement question is the highest temperature recorded in the Daily Observations table, not the Day High & Low summary.

The 0% YES price looks anchored to the fact that the day opened cool and the early-morning observations were far below the usual August normal at Los Angeles International Airport. For context, the National Weather Service lists the LAX maximum normal for 14 August at 77°F and the record at 92°F, which puts anything in the low 80s as warm but not exceptional for the airport station. Weather Underground’s own history page is the controlling source here, so traders will care more about whether the table continues to climb through the afternoon than about broader Los Angeles forecasts.

The main catalysts are the same ones that move airport readings in real time: marine layer erosion, onshore flow, and the timing of the coastal sunshine. The National Weather Service discussion on 14 August called for low clouds to shrink, mostly sunny conditions inland, and highs around the 70s on the coast and 80s inland, with no watches or warnings in effect. For a Polymarket user, the practical check is whether LAX Daily Observations prints a late-afternoon high above the current range before the settlement window closes at 12:00 UTC, since that single table line determines the final outcome.

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

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

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 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 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.