Highest temperature in Los Angeles on July 12?

Platform comparison

Market context

The market tracks the peak Fahrenheit reading at Los Angeles International Airport (KLAX) on 12 July 2026, resolving via Wunderground history. With the settlement window closing at noon UTC on 13 July, the current 0% implied probability for any specific outcome reflects thin liquidity rather than a consensus on impossibility, as historical July highs at KLAX typically hover around 73°F, rarely exceeding 79°F [1]. Programmatic traders should note that the frontrunner outcome is 76–77°F at 67%, with 74–75°F trailing at 25%, suggesting the crowd expects a mild marine layer influence rather than extreme heat [2].

Historical data frames this as a low-variance event; July averages at KLAX show highs rarely falling below 69°F or exceeding 79°F, making extreme outliers statistically improbable without a significant atmospheric shift [1]. A bot strategy would likely monitor real-time marine layer depth and wind direction, as the 2026 July forecast projects daily highs between 72°F and 82°F, with overnight lows of 64–70°F [3]. Traders must watch for sudden shifts in the Pacific marine layer, which often suppresses coastal temperatures, and any regional heat advisories from the National Weather Service that could push readings toward the upper 70s or low 80s [6].

Recent heat records at nearby airports, such as 87°F at Los Angeles Airport, indicate potential volatility if the marine layer breaks, though KLAX remains more buffered [10]. For automated execution, conditional orders should trigger on Wunderground updates showing sustained temperatures above 75°F before noon UTC, as the resolution source is strictly the highest daily reading for KLAX [2]. The noon UTC settlement creates a tight window for data ingestion, requiring scripts to poll the Wunderground history API immediately after the cutoff to capture the final resolved value without latency.

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

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 Polymarket Bot UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.

Do I need to KYC for this market?

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