Highest temperature in Beijing on July 13?

Platform comparison

Market context

Beijing’s Capital International Airport will record its peak temperature for 13 July 2026, with the market resolving to the Celsius range containing that high. The current crowd-implied probability for a YES outcome sits at 0%, yet Polymarket data shows the frontrunner outcome is 34°C at 42%, followed by 33°C at 31%[1]. This divergence suggests the 0% figure may reflect a specific binary contract definition rather than the full distribution of likely temperature bands.

Historical July climatology for Beijing places average highs near 31–32°C, though extreme events have pushed temperatures above 40°C, including a 40°C peak in 2023 and a record 41.9°C on 24 July 1999[1][2][8]. Recent patterns show elevated humidity and scattered thunderstorms, which can suppress daytime peaks despite the month’s status as the year’s hottest[1]. The 0% implied probability appears inconsistent with this baseline, as even moderate heat would likely exceed lower thresholds, framing the current odds as an outlier against comparable cases.

Traders should monitor real-time Wunderground updates for the Beijing Capital International Airport Station, the designated resolution source, as well as any official heatwave advisories from Chinese meteorological authorities[1]. Early July 2026 has seen no major announcements altering seasonal forecasts, but sudden thunderstorm activity could shift the peak temperature below 34°C[1]. With settlement ending at 12:00 UTC on 13 July, the market’s 0% line warrants scrutiny against the 42% probability assigned to 34°C on the broader Polymarket contract, highlighting a meaningful cross-platform odds discrepancy.

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

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.

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 Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.