Highest temperature in Shanghai on June 30?

Platform comparison

Market context

Shanghai on 30 June 2026 is entering its peak humid season, where daily highs typically climb between 25°C and 30°C, rarely exceeding 32°C under normal cloud cover. The market currently prices a YES outcome at 33%, implying the crowd believes the temperature will breach the upper threshold of the defined range. This probability sits just below the historical average for late June at Pudong Airport, where daily highs average 28°C (83°F) and only occasionally spike above 32°C during intense heatwaves [1][5].

Historical data from the past five years shows that late June temperatures at Pudong Airport hover consistently around 28°C, with extreme spikes above 32°C occurring in only 15–20% of days, usually tied to prolonged southerly flow or reduced cloud cover [1][6]. The current 33% implied probability is slightly elevated compared to this baseline, suggesting traders are pricing in a marginal heat anomaly. However, given that the hot season formally begins 17 June and stabilises by early July, such elevated odds may reflect overreaction to short-term forecast volatility rather than a structural shift in regional climate patterns [5].

Traders should monitor the China Meteorological Administration’s 24-hour forecast updates for Pudong, particularly any announcements regarding reduced cloud cover or intensified southerly winds, which are the primary catalysts for temperature spikes above 32°C [2]. Additionally, watch for real-time Wunderground data releases at 12:00 UTC on 30 June, as the market resolves strictly on the highest recorded temperature from that station [3]. A recent AccuWeather forecast for 30 June predicts highs of 29–30°C, reinforcing the view that the 33% YES probability is optimistic unless a sudden heat surge materialises overnight [3]. USDC liquidity on Polygon remains deep, allowing conditional tokens to adjust rapidly as new temperature data emerges.

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 PolyGram, 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 PolyGram. 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 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.