Highest temperature in Shanghai on July 18?

Platform comparison

Market context

On 18 July 2026, Shanghai will record its daily high temperature, measured at Pudong International Airport Station and reported via Wunderground. The market currently prices all temperature ranges at 0%, reflecting the settlement window's closure before any historical data becomes available. This contract resolves to whichever bracket contains the actual recorded maximum, with outcomes spanning roughly 25°C to 40°C in 1-degree increments. Traders holding conditional tokens representing specific ranges will receive USDC payouts proportional to their position if that range resolves true; all other positions expire worthless on Polygon.

Shanghai's July climate is remarkably consistent year-on-year, with historical highs clustering between 32°C and 37°C during mid-summer. The past decade shows only three instances of temperatures exceeding 38°C in July, whilst readings below 30°C are exceptionally rare. This tight historical distribution means the probability mass should concentrate heavily in the 33–37°C bands, yet the current 0% pricing suggests the market has not yet attracted sufficient liquidity to reflect seasonal norms. Comparable July 18 data from prior years—such as 2023's 35°C and 2022's 34°C—provide direct benchmarks for positioning.

Traders should monitor China's meteorological forecasts released in early July 2026, particularly any alerts for heat waves or tropical storm systems that could suppress temperatures. Shanghai's position near the Yangtze estuary means monsoon activity and typhoon proximity can shift daily highs by 3–5°C. The resolution source's timestamp (12:00 UTC) aligns with afternoon peak heating, so any unusual atmospheric patterns or urban heat island effects documented in regional weather reports become material to contract outcomes.

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

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

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.

Do I need to KYC for this market?

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