Highest temperature in Shanghai on July 8?

Platform comparison

Market context

The real-world event is the highest temperature recorded at Shanghai Pudong International Airport on 8 July 2026, measured in degrees Celsius and resolved via Wunderground data. This single-day peak determines the market outcome, with the settlement window closing at 12:00 UTC on 8 July 2026. The current crowd-implied probability of 0% YES suggests traders believe the temperature will fall outside the specific range being bet on, likely due to historical patterns or forecast expectations.

Historically, July at Shanghai Pudong sees daily highs averaging 87°F (30.6°C), rarely dipping below 75°F (23.9°C) or exceeding 95°F (35°C), with the month’s peak average reaching 88°F (31.1°C) [1][8]. Recent extreme heat events in Shanghai, including a 40.9°C reading at Xujiahui and a 40.1°C mark at noon on Thursday, confirm the city’s capacity for temperatures well above 35°C [4][7]. These precedents frame the 0% probability as potentially misaligned if the specific range includes values above 35°C, which are common in mid-July.

Traders should monitor Shanghai’s heatwave alert schedules and meteorological bulletins, as the city recently issued its highest heatwave alert twice in one week, forecasting temperatures exceeding 40°C in parts of Pudong [6]. Dependencies include Wunderground’s daily data updates and any official adjustments from the Shanghai Meteorological Center, which recorded consecutive days of extreme heat above 40°C [7]. A programmatically approaching this market would involve querying Wunderground’s historical API for ZSPD on 8 July 2026, cross-referencing with real-time alerts from the Straits Times or NDTV, and executing conditional orders based on threshold breaches above 35°C or 40°C [6][7].

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

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 Polymarket Bot UK. 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.

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 Bot 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.