Highest temperature in Shanghai on July 23?

Platform comparison

Market context

Shanghai’s daytime high on 23 July will be measured at Shanghai Pudong International Airport, and the market is effectively asking how hot a midsummer afternoon gets there before the settlement cut-off. With the crowd-implied price at 0% for **YES** on the contract headline, the more useful cross-check is the outcome ladder on the exchange itself: **36°C** is priced as the frontrunner at 40%, with **35°C** close behind at 35%.[1] That is meaningfully hotter than the typical July profile for Shanghai, where average daily highs are around **31°C** and humidity is high, which tends to keep the distribution skewed towards the mid-30s rather than extreme heat.[2]

For comparison, the market is broadly aligned with climatology but still leaves a decent tail for a spike above the usual range. July in Shanghai is normally warm and muggy, with average highs around **31°C**, average lows near **26°C**, and frequent rain days, so any clear-sky run or stagnant air mass can push the airport reading higher than the monthly mean.[2] In that sense, the exchange’s concentration around **35°C-36°C** looks consistent with a summer-heat baseline, while anything materially above that would require a stronger-than-normal hot spell. There is no sign here of a sharp sportsbook-style divergence to anchor against, so the main comparison is between the market’s own price ladder and the underlying climate tendency.[1][2]

The key traders’ watchpoint is the actual airport observation path on the day, because the contract resolves to the **highest temperature recorded for all times** at Shanghai Pudong International Airport Station on 23 July, using Wunderground’s history page.[1] That makes the intra-day temperature curve more important than the morning start point: a late-afternoon peak, delayed sea breeze, or a brief heat burst before showers could decide the outcome. With settlement ending at **12:00 UTC**, market pricing should remain sensitive to whether the local forecast favours a hot, dry afternoon or convective cloud and rain that cap the maximum temperature.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Shanghai on July 23? 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 Best Prediction Markets, which mirrors the Polymarket order book at 0% fees.

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

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

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 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 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.