Highest temperature in Shanghai on June 27?

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Active sub-markets

Market context

Shanghai’s Pudong International Airport is entering its peak summer heat window, with meteorological records showing daily highs consistently climbing into the 27°C to 30°C range by late June. The current crowd-implied probability of 0% for a specific temperature range suggests traders are either misreading the seasonal baseline or betting on an extreme, unseasonal cool spell that contradicts decades of local climate data. Historical averages confirm that late June in Shanghai rarely dips below 24°C, with highs frequently reaching 27°C or higher, making the 0% market stance appear statistically fragile against established weather patterns[3][5].

Traders should monitor the upcoming monsoon rainfall forecasts and any sudden shifts in the East Asian subtropical ridge, which could temporarily suppress temperatures. Recent climate reports indicate that Shanghai’s June 2026 forecast projects daily highs between 27°C and 30°C, with humidity levels near 79%, reinforcing the likelihood of sustained warmth rather than a cold anomaly[2][5]. The divergence between prediction platforms is notable here: Polymarket users often trade decimal odds reflecting implied probabilities, while Kalshi and Betfair emphasise fixed odds with stricter KYC requirements, potentially creating liquidity gaps if one platform’s fee structure discourages retail participation on this specific weather event[7].

The settlement window ending 2026-06-27T12:00:00Z requires precise alignment with Wunderground’s hourly data, meaning any delay in official reporting could skew resolution. Unlike Smarkets, which offers lower fees but requires manual KYC verification, platforms like Polymarket allow faster, anonymous entry, which may explain the current 0% probability if a few large, anonymous traders are betting against the consensus without public backing[3]. Given the historical trend of Shanghai’s hot season lasting from mid-June to mid-September, with average highs above 80°F (27°C), the market’s current stance appears to ignore the robust seasonal reality[8].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Shanghai on June 27? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). PolyGram routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On PolyGram, 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?

PolyGram 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 PolyGram?

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

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.