Highest temperature in Shanghai on May 22?

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Market context

Shanghai Pudong Airport’s highest temperature on 22 May is the event in focus, with the market currently pricing a 0% chance of a YES outcome. That makes the odds look like a clear favourite/underdog setup: the consensus is effectively that the day will not land in the market’s target range, and any value case rests on the possibility of an unpriced warm spell during the observation window before settlement at 12:00 UTC. For a late-May Shanghai reading, the base rate is not especially cold; climatology for the city typically puts May highs in the high teens to mid-20s Celsius, with a meaningful tail for warmer days when sunny southerly flow builds in.

Recent seasonal guidance leans towards a warm but not extreme pattern. WorldWeatherOnline puts Shanghai’s May averages broadly in the 18°C to 25°C range, while other weather references show daily highs commonly rising through the low-to-mid 20s as the month progresses. That framing matters because a zero-implied market often leaves the most room for contrarian value in the upper edge of the plausible distribution, especially if the relevant bucket is a fairly narrow temperature band. The favourite remains the “no” side unless the forecast trend has strengthened sharply towards a hot afternoon peak.

Traders should watch the short-range forecast for Shanghai Pudong closely, especially cloud cover, wind direction and any surge in daytime heating from a clearer airmass. The settlement source is Wunderground’s station history for ZSPD, so the key dependency is the actual observed maximum at that airport station rather than a city-wide forecast or an average across Shanghai. If local models have been edging up through Thursday night into Friday morning, that is the main catalyst for a repricing from an apparently dead market; if not, the 0% consensus is likely to persist.

Sources: 1 · 2 · 3 · 4

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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 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 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.

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.

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.