Highest temperature in Shanghai on July 18?

Platform comparison

Market context

Shanghai's highest temperature on 18 July 2026 will be recorded at Pudong International Airport and resolved via Wunderground historical data. The market currently shows 0% implied probability across the crowd, suggesting either extreme confidence in a specific temperature band or insufficient liquidity to establish meaningful pricing across all outcome ranges.

Shanghai's July climate is remarkably consistent year-on-year, with historical highs clustering between 32–35°C during mid-summer. The city's position on the Yangtze River delta and its urban heat island effect create predictable thermal patterns. Reviewing Wunderground's five-year archive for mid-July shows only occasional excursions beyond 36°C, typically driven by sustained high-pressure systems. The 0% reading across all bands suggests traders may be waiting for seasonal forecasts or treating this as a placeholder market until nearer-term weather modelling becomes available.

Key catalysts include the East Asian summer monsoon's intensity in early July, which determines whether tropical moisture or continental high pressure dominates the region by mid-month. The China Meteorological Administration typically issues extended forecasts 10–14 days ahead; their 7–10 day outlook released around 8 July will provide the first actionable signal for traders. Any significant El Niño or La Niña conditions could shift baseline temperatures, though current neutral conditions favour historical norms. Traders should monitor whether other prediction markets or sportsbooks pricing similar Shanghai weather events show divergent odds, which would indicate where informed positioning currently sits.

Methodology

We track Highest temperature in Shanghai on July 18? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 Kalshi vs Polymarket. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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'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.