Highest temperature in Shanghai on July 12?

Platform comparison

Market context

Shanghai is experiencing strong winds and rain on Sunday 12 July, with a forecast high of 30°C (87°F) at Hongqiao and current overcast conditions at Pudong showing 25°C (79°F) [4][8]. This active weather pattern, featuring light rain and gusty easterlies, directly suppresses the likelihood of extreme heat, aligning with the market’s current 0% implied probability for any temperature range significantly above the seasonal average [4].

Historically, July is Shanghai’s hottest month, with Pudong averaging a high of 37°C (87°F) and frequently exceeding 30°C (86°F) during sunny spells [2][6]. However, comparable cases of heavy rain and cloud cover in mid-July typically cap maximum temperatures near 30–32°C, as seen in recent days where peaks reached only 31–32°C despite July’s usual intensity [3]. The current 0% odds reflect this divergence: while the season supports heat, the immediate meteorological catalysts—persistent rain and high humidity—make record-breaking temperatures statistically improbable.

Traders should monitor the National Weather Service timeseries for ZSPD (Pudong) for real-time temperature spikes, as cloud cover and wind speed are the primary dependencies limiting heat accumulation [7]. The settlement relies on Wunderground’s daily high for Pudong, so any sudden clearing of skies before the 12:00 UTC cutoff could alter the outcome, though current forecasts show no such shift [4]. Recent data confirms overcast skies and 89% humidity, which strongly inhibit thermal rise, reinforcing the consensus that the day will remain within moderate ranges rather than extreme heat [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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.