Highest temperature in Shanghai on June 8?

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Market context

Shanghai's weather on 8 June 2026 will be shaped by the onset of the East Asian summer monsoon, which typically establishes itself across the Yangtze River Delta region by early June. Current meteorological patterns suggest a transition period between spring and full summer conditions, with increasing moisture advection from the Pacific and South China Sea. The 0% crowd probability reflects substantial uncertainty around which specific temperature band will capture the day's high, rather than doubt about whether a measurable maximum will occur.

Historical data from Shanghai Pudong International Airport shows June highs typically range between 28–32°C, with occasional excursions above 33°C during early heat waves. The distribution of June temperatures is relatively tight compared to July and August, when extremes become more common. Previous years with similar pre-monsoon atmospheric setups have produced highs clustering in the 29–31°C range, though the variability across individual years remains pronounced enough to justify the current flat probability distribution across multiple temperature bands.

Traders should monitor upper-air pattern forecasts and sea surface temperature anomalies in the Western Pacific through early June, as these drive monsoon intensity and timing. The China Meteorological Administration typically issues regional outlooks 10–14 days in advance; any revision toward above-normal temperatures would shift probabilities toward higher bands. Real-time observations from 6–7 June will provide the most actionable signal, as they will constrain the atmospheric profile immediately preceding the settlement date.

Methodology

We track Highest temperature in Shanghai on June 8? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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?

On Prediction Today, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Prediction Today is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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 it cost to trade on Prediction Today?

Zero. Prediction Today routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.