Highest temperature in Shanghai on June 30?

Platform comparison

Market context

The underlying event is the highest temperature recorded at Shanghai Pudong International Airport on 30 June 2026, with the market currently pricing a 32% chance that the reading falls into the favoured higher range. Historical data for late June shows daily highs typically climbing from 77°F to 83°F, rarely dipping below 69°F or surging past 92°F, while summer conditions in Shanghai regularly exceed 30°C and can reach 35°C during peak sunshine[1][4]. With precipitation peaking in June at an average of 6.3 inches, the consensus leans toward the underdog lower range, yet the value spot likely sits contrarian on the higher range given the frequent occurrence of days exceeding 86°F in this period[5].

Traders must watch the immediate forecast for Tuesday 30 June, which indicates a 25% risk of thunderstorms and light rain with temperatures hovering near 24°C to 25°C, a significant dampener for peak heat[6]. The primary dependency is the cloud cover and rainfall intensity, as heavy precipitation would suppress the daily maximum well below the 30°C threshold, whereas clear skies could push readings toward the 35°C upper limit seen in sunny spells[4]. While the 14-day outlook suggests light rain, any sudden shift in the monsoon track or a break in the cloud layer could invalidate the current 32% implied probability, creating a sharp value opportunity for those betting on the higher range if the weather clears unexpectedly[7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Shanghai on June 30? 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 Who Will Win, which mirrors the Polymarket order book at 0% fees.

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 Who Will Win. 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 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 Who Will Win 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.