Pronóstico: Highest temperature in Los Angeles on August 9?

Platform comparison

Market context

Polymarket is already pricing this contract as an almost-certain **80–81°F** outcome, with the crowd-implied probability at **0% YES** for the other bins and the contract settling in USDC on Polygon via conditional tokens. In practical terms, traders are not betting on a broad Los Angeles heat narrative; they are pricing the specific Weather Underground reading for **KLAX** on **9 August 2026**, with the settlement source defined by the **Daily Observations** table rather than the summary high/low panel.[3][4]

The historical frame supports that read. Downtown Los Angeles has a long-run August normal maximum of **84°F**, and the record for that calendar day is **100°F**, but coastal LAX is usually cooler and can be capped by marine influence even when inland neighbourhoods run hotter.[1] Recent local coverage has shown sharp late-summer heat spikes across Southern California, including reports of record-breaking August temperatures at multiple stations, which is useful context for how fast a daily high can move in this region even when the market still resolves within a narrow band.[14][16]

For traders, the main catalysts are the final station observations and any late-day revisions on Weather Underground, because Polymarket specifies that adjustments count until the first datapoint for the next day is published.[3][4] The key dependency is not a forecast update but the completed historical record from KLAX, so the only real watchpoint is whether the published daily observation ends up inside the currently dominant bin or slips into an adjacent one.[3][12] After the observation window closes, the on-chain position should settle mechanically against the resolved temperature range.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Pronóstico: Highest temperature in Los Angeles on August 9? 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

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 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.

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.