Highest temperature in Los Angeles on July 17?

Platform comparison

Market context

Los Angeles is currently enduring a dangerous heat wave that has pushed temperatures well above normal for mid-July, with the city facing extreme heat warnings as the event peaks this week [2]. The prediction market for the highest temperature on 17 July 2026 at Los Angeles International Airport (KLAX) shows a crowd-implied probability of 0% for the “YES” outcome, suggesting the market believes the temperature will not fall into the specific range being traded, while the frontrunner outcome is 80–81°F at 75% probability [1].

Historical July data for KLAX typically sees highs between 75°F and 85°F, and the market’s strong lean toward 80–81°F aligns with both seasonal norms and the current heat wave’s intensity [1]. The July 4, 2026 market correctly priced 74–75°F at 42% open probability before resolving to 100%, indicating the crowd can accurately identify value bins in LA summer temperature markets when given sufficient early signal [3]. With the current heat wave still active, the consensus is firmly on the 80–81°F bin, but contrarian value may exist in the 78–79°F range if the heat wave breaks unexpectedly before settlement.

Traders should monitor the National Weather Service’s heat wave duration forecasts and any announced shifts in offshore flow or marine layer intrusion, which could rapidly cool KLAX temperatures [2]. The settlement window ends 2026-07-17T12:00:00Z, so real-time Wunderground data for KLAX will be the sole resolution source, making intraday temperature spikes or drops critical to watch [1].

Sources: 1 · 2 · 3

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 Who Will Win 2026. 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.

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'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.

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.