Highest temperature in Shanghai on June 30?

Platform comparison

Market context

The real-world event hinges on the peak temperature recorded at Shanghai Pudong International Airport on 30 June 2026, measured in degrees Celsius and resolved via Wunderground data. Historically, June in Shanghai sees daily highs climbing from 77°F to 83°F, rarely dipping below 69°F or exceeding 92°F, with the hot season formally beginning around 17 June when averages surpass 80°F [1][6]. Summer peaks regularly exceed 30°C (86°F), reaching 35°C (95°F) under intense sun, suggesting the current 27% YES probability for a specific range is conservative given typical late-June volatility [5]. A power-user would programmatically back-test Wunderground’s historical daily maxima for ZSPD to calibrate conditional orders, treating the 27% as a mispricing if the model projects a 35% likelihood of exceeding the threshold.

Traders must monitor the immediate forecast for Tuesday 30 June, which predicts a high of 27°C (80°F) with 84% humidity and east-southeasterly winds at 6 mph [2]. While no major weather announcements are scheduled, the dependency on real-time Wunderground ingestion means any latency in data updates could skew settlement timing. Recent meteorological trends show daily incident solar energy gradually decreasing through June, falling from 6.0 kWh to 5.1 kWh, which may temper extreme heat spikes despite the onset of the hot season [1]. A systematic approach would involve scraping live BBC and AccuWeather feeds for hourly deviations, then executing copy-trading bots to mirror positions when humidity drops below 80%, as lower moisture often correlates with higher peak temperatures in coastal Shanghai [2][7]. The settlement window closing at 12:00 UTC ensures the market resolves on the day’s absolute maximum, not an average, making intraday spikes critical for outcome determination.

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

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 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.