Highest temperature in Shanghai on July 5?

Platform comparison

Market context

On 5 July 2026, the Shanghai Pudong International Airport Station will record its highest temperature for the day, a real-world event that determines the resolution of this prediction market. Despite the crowd-implied probability of 0% for the "YES" outcome, historical data suggests temperatures in Shanghai during early July regularly exceed 30°C, often reaching 35°C under sunny conditions[5]. The average daily high at Pudong in July climbs from 84°F to 88°F (approximately 29°C to 31°C), rarely falling below 75°F[1]. Recent market activity on Polymarket for the 4 July contract shows a leading outcome of 33°C–34°C, with the 5 July market currently pricing 30°C at 43% and 31°C at 25%, indicating traders expect warmth consistent with seasonal norms rather than the 0% implied by the binary "YES" contract[2][6].

Traders should monitor announcements from the Shanghai Meteorological Bureau regarding severe thunderstorm clusters and weather fronts, which could temporarily suppress temperatures or trigger record highs. Recent reports indicate parts of Pudong have already exceeded 40°C this summer, with temperatures expected to hover between 35°C and 37°C before a relief front arrives[7][8]. The settlement relies on Wunderground data for the highest temperature recorded at any time on 5 July, making the timing of heat peaks critical[2]. On-chain mechanics on Polygon, using USDC and conditional tokens, mean liquidity shifts rapidly as weather forecasts update, so watching the National Weather Service time-series for ZSPD is essential for spotting emerging trends in real-time[3].

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

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

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Legit? 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.