Highest temperature in Shanghai on July 18?

Platform comparison

Market context

Shanghai's peak temperature on 18 July 2026 will be recorded at Pudong International Airport Station and resolved against historical weather data from Wunderground. The settlement window closes at midday UTC on that date, capturing the full diurnal cycle for the day in question. Current crowd-implied probability sits at 0%, suggesting traders are either heavily concentrated in a single temperature band or the market has not yet attracted sufficient liquidity to establish meaningful price discovery across all resolution categories.

July represents Shanghai's hottest month climatologically, with average daily highs near 32°C and extremes regularly exceeding 35°C. Historical records from Pudong show temperatures have reached 40°C or higher on multiple occasions during mid-July heat waves, most notably in 2013 and 2017. The absence of any meaningful probability mass at 0% indicates either extreme confidence in a specific outcome band or thin order books across alternative ranges. Comparable weather markets on Kalshi and Polymarket typically show distributed probabilities across 3–5 temperature brackets during summer months in major Asian cities, reflecting genuine meteorological uncertainty rather than consensus forecasting.

Traders should monitor China Meteorological Administration forecasts released in early July 2026, which typically provide 10–14 day outlooks for heat events and monsoon activity. La Niña or El Niño conditions active during northern hemisphere summer can materially shift Shanghai's temperature distribution. The current 0% reading warrants scrutiny: it may reflect a market awaiting initial price discovery or indicate technical issues with order placement across certain resolution categories.

Methodology

This page reviews Highest temperature in Shanghai on July 18? 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'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.