Highest temperature in Shanghai on July 6?

Platform comparison

Market context

The real-world event hinges on the peak temperature recorded at Shanghai Pudong Pudong International Airport on 6 July 2026, measured in degrees Celsius and sourced from Wunderground. This single data point will determine the market resolution, with the settlement window closing at 12:00 UTC on the same day. The current crowd-implied probability of 0% for the "YES" outcome suggests traders believe the temperature will fall outside the specific range being bet on, likely due to expectations of extreme heat typical for mid-July in Shanghai.

Historical patterns frame this probability sharply: July at Shanghai Pudong typically sees daily highs rising from 84°F to 88°F (29°C to 31°C), rarely dipping below 75°F (24°C) or exceeding 95°F (35°C)[1]. The day with the highest average temperature in Shanghai during July is 29 July, recording 32.5°C[6], while general July weather often exceeds 35°C (95°F) during the daytime[7]. A power-user evaluating this market programmatically would script a bot to pull Wunderground’s hourly history for ZSPD, comparing the 6 July peak against these long-term averages to identify mispriced ranges.

Traders should monitor immediate catalysts such as the onset of the East Asian monsoon rains, which can suppress temperatures, or sudden heatwaves driven by high-pressure systems. Recent forecasts for Hongqiao Airport show drizzle and temperatures near 33°C (93°F) today, with light rain expected tomorrow[2], indicating active moisture that could influence Pudong’s peak. Dependencies include the reliability of Wunderground’s data feed and the precise timing of the 12:00 UTC settlement, which a conditional-order bot must account for to avoid execution lag. No moralising is needed; the facts dictate that mid-July heat in Shanghai is a high-probability event, making any range excluding 30–35°C a likely outlier.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.