Highest temperature in Los Angeles on July 12?

Platform comparison

Market context

An extreme heatwave gripping Los Angeles and much of California since 9 July has pushed temperatures well above seasonal averages, with scorching afternoon heat and heightened wildfire concerns dominating the regional outlook[6]. This surge in high pressure across the western United States has created dangerous, dry conditions, directly challenging the current 0% crowd-implied probability that the highest temperature at Los Angeles International Airport on 12 July will fall into the market’s defined range[6].

Historical data frames this low probability as potentially premature; while July 2024 was officially California’s hottest month ever with an average of 81.7°F, typical July highs in Los Angeles average 85°F, often reaching between 78°F and 92°F[4][7]. Long-term averages suggest daytime maximums of 29°C (84°F) with 12 hours of sunshine, and specific forecasts for 12 July 2026 indicate a range of 24°C to 32°C (76°F to 89°F), meaning a significant heat event could easily breach the threshold implied by the market’s current pricing[5][10].

Traders should monitor the National Weather Service’s excessive heat warnings and energy use advisories, which have already been issued for Southern California as temperatures climb above 100°F in inland valleys[2]. The primary catalyst is the persistence of the high-pressure system; if it strengthens further, temperatures could soar well above seasonal norms, increasing the risk of record-breaking heat similar to the 2024 event[6][7]. Watch for updates on cooling centre openings and wildfire danger levels, as these indicate the severity and duration of the current heatwave.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Los Angeles on July 12? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Today 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.