Highest temperature in Los Angeles on July 20?

Platform comparison

Market context

Los Angeles is currently experiencing a dangerous heat wave, with temperatures soaring well above typical July averages as the city braces for extreme conditions this week [4]. The prediction market for the highest temperature recorded at Los Angeles International Airport on 20 July 2026 shows the crowd-implied probability for any outcome above 81°F sitting at 0% YES, despite the active heatwave [1]. This pricing suggests traders are betting the day will remain within the 80–81°F range, which the market currently assigns a 100% probability, even as recent forecasts indicate highs around 29°C (84°F) for the county during July [2].

Historical data from earlier in the month offers a crucial frame for reading this probability. On 4 July 2026, Los Angeles hit 74–75°F, and the prediction market correctly nailed that outcome before it resolved [3]. However, the current heatwave announced on 14 July signals a significant deviation from that baseline, with warnings urging residents to stay hydrated and avoid outdoor activity during peak sun hours [4]. The discrepancy between the 100% frontrunner probability for 80–81°F and the forecasted 29°C highs creates a potential arbitrage opportunity for traders monitoring USDC liquidity on Polygon.

Traders should watch daily Wunderground updates for the KLAX station, as the market resolves strictly on this specific data point [1]. The heatwave’s duration remains the primary catalyst; if the extreme temperatures persist through 20 July, the 80–81°F cap could be breached, invalidating the current 0% probability for higher ranges [5]. With settlement ending at 12:00:00Z on 20 July 2026, conditional token holders must track whether the heat advisory extends, as a prolonged spike could shift the market away from the current consensus [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Los Angeles on July 20? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

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 PolyGram 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.