Highest temperature in Beijing on July 4?

Platform comparison

Market context

The underlying event is the peak heat recorded at Beijing Capital International Airport on 4 July 2026, with the market currently pricing any temperature above 35°C at a crowd-implied probability of 0% YES. This zero valuation suggests the consensus firmly expects a cooler day, yet historical data frames this as a potential underdog trap. In recent years, July has been Beijing’s hottest month, with daily highs averaging 88°F (31.1°C) and rarely dipping below 78°F (25.6°C) [2]. More critically, 2023 saw the month’s peak reach 40°C (104°F), and the all-time record for late July hit 42.1°C in 2010 [4][9]. Even June 2026 recently recorded a scorching 95°F (35°C) on 27 June, indicating the heatwave is already active [6].

Traders should watch for immediate meteorological dependencies, specifically the arrival of monsoon rains or persistent high-pressure ridges that could spike temperatures beyond the 35°C threshold. China recently recorded its hottest July in recent history, with national averages hitting 23.2°C, a trend that often amplifies local extremes in the capital [3][5]. Authorities have already urged people to limit outdoor time due to record-breaking heat, a signal that extreme conditions are not merely theoretical [8]. The value spot likely sits contrarian to the 0% consensus; if the high-pressure system holds without significant rain, the probability of exceeding 35°C could be substantially higher than the market implies, offering a sharp handicapper’s edge against the favourite of a cool day.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Beijing on July 4? 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 Who Will Win, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 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.