Highest temperature in Los Angeles on July 20?

Platform comparison

Market context

Los Angeles recorded its highest temperature on 20 July 2026 at the Los Angeles International Airport Station, with the official reading falling within the 80–81°F range. This outcome aligns with the Polymarket consensus, which assigns a 100% probability to that bracket, while the specific contract on best-prediction-markets.co.uk currently shows a 0% implied probability for a YES resolution, indicating a stark divergence between platforms on how the event is framed or settled.

Historical July temperatures in Los Angeles County typically peak around 29°C (84°F), with lows near 19°C (66°F), making an 80–81°F reading consistent with seasonal norms rather than an extreme outlier [2]. The market’s prior accuracy on similar weather contracts is notable; for instance, the July 4, 2026 LA temperature market correctly resolved to 74–75°F, confirming the platform’s reliability in forecasting mid-summer highs [3]. The current 0% line on this specific contract likely reflects a mismatch in resolution criteria or a mispricing relative to the broader 80–81°F frontrunner.

Traders should monitor daily Wunderground updates for KLAX, the designated resolution source, as real-time temperature logs can shift implied probabilities before the 2026-07-20 settlement window closes. While no new announcements are pending, the recent July 9 heatwave that prompted extreme heat advisories across California suggests volatile conditions remain possible, though the current data points to stable, expected highs [4]. Cross-platform comparison reveals that while Polymarket treats 80–81°F as certain, other venues may be pricing in lower ranges, creating an arbitrage opportunity for those tracking the divergence.

Sources: 1 · 2 · 3 · 4

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Best Prediction Markets UK, which mirrors the Polymarket order book directly.

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 Best Prediction Markets 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.

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.