Highest temperature in Beijing on August 8?

Platform comparison

Market context

Polymarket is pricing the contract at **0% YES**, so the market is effectively saying there is no traded expectation of a Beijing Capital International Airport reading landing in the specified temperature range on 8 August, with outcome exposure settled in USDC on Polygon through conditional tokens. The event itself is the day’s *highest* airport temperature, not the headline “day high” shown elsewhere, because the market rules make Weather Underground’s Daily Observations table the decisive source if there is any mismatch with the summary display.[17]

The historical frame is straightforward: Beijing in August is normally hot, with average daytime highs around 31°C to 33°C across several climate summaries, and recent years have produced peaks in the mid-30s °C rather than anything unusually cool.[7][10][16] Weather Underground’s own Beijing history page is the relevant reference point for this contract, while contemporaneous history pages from other services show similar late-summer warmth and confirm that 8 August typically sits in the hottest part of the month.[17][7][2]

For traders, the main catalyst is the intraday progression of the airport observations rather than any policy or schedule event. The current reading around late morning UTC already shows warm conditions at Beijing Capital International Airport, and the market will ultimately hinge on whether the recorded maximum before the settlement cut-off falls inside the chosen range.[4][1] Because the settlement window ends at 12:00 UTC, any late-morning or early-afternoon heat spike in the station’s Daily Observations table matters more than broad city averages; the key dependency is the final Weather Underground log, not forecast ranges from other weather sites.[17][1]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Beijing on August 8? 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.

UK Frequently Asked Questions

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.