Highest temperature in Beijing on August 17?

Platform comparison

Market context

Beijing's maximum temperature on 17 August 2026 will be recorded at the Capital International Airport meteorological station and resolved against the Daily Observations table on Weather Underground. The current crowd-implied probability sits at 0%, suggesting traders are either pricing in an extremely narrow outcome band or treating this as a placeholder contract awaiting substantive positioning.

August temperatures in Beijing typically peak between 32–35°C, with historical records showing the city has experienced highs exceeding 40°C during exceptional heat events. The 17th falls within the latter half of summer, when afternoon thunderstorms become more frequent and can suppress daily maxima. Comparable August days over the past decade show considerable variance: the 2010 heat wave produced readings above 38°C across multiple days, whilst cooler Augusts have seen highs in the 28–30°C range. This historical spread indicates the resolution bands likely span several degrees, yet the zero probability suggests traders have not yet engaged with the full range of plausible outcomes.

Monitoring China's meteorological forecasts and any El Niño or monsoon pattern updates through July 2026 will be material to positioning. The China Meteorological Administration typically issues seasonal outlooks in early summer; deviations from normal precipitation patterns can meaningfully shift temperature trajectories. Additionally, any significant urban heat island effects from Beijing's continued development, or shifts in the East Asian summer monsoon intensity reported by regional climate centres, could influence whether the 17th tracks toward historical highs or mid-range readings. Cross-platform comparison shows limited activity on this contract across major prediction markets, indicating early-stage price discovery.

Methodology

This page reviews Highest temperature in Beijing on August 17? 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

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 PolyGram. 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'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.

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.