Highest temperature in Shanghai on May 23?

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Active sub-markets

Market context

Shanghai's weather in late May typically sits in the warm-to-hot range as the city transitions into early summer. Historical data from the Shanghai Pudong International Airport station shows May temperatures regularly exceed 28°C, with daily highs frequently reaching into the low 30s. The 0% crowd probability suggests traders are either uncertain about the exact range boundaries or awaiting clarification on how the market's temperature brackets are structured. Without visibility on the specific threshold options available, the current pricing reflects minimal conviction rather than a genuine forecast that temperatures will remain unusually cool on that date.

Seasonal patterns provide the primary framework for assessing May 23rd conditions. Over the past two decades, Shanghai's highest May temperatures have ranged from 25°C to 35°C depending on atmospheric circulation patterns and whether warm air masses from the south dominate. The city experiences increasing humidity and occasional pre-monsoon weather systems during this period, though sustained heat waves are less common than in June and July. Traders should monitor the China Meteorological Administration's extended forecasts as May approaches, particularly any alerts regarding anomalous warming or tropical systems that might influence upper-range outcomes.

The settlement mechanism relies on Wunderground's historical records from Pudong Airport, a reliable source for Shanghai's official weather observations. Traders should verify the exact temperature brackets offered before committing capital, as the 0% reading may simply reflect ambiguity about which range will ultimately contain the day's high rather than confidence in unseasonably cool conditions.

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Shanghai on May 23? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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?

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