Highest temperature in Shanghai on July 9?

Platform comparison

Market context

Shanghai is entering its peak summer heatwave, with July 9 marking a critical day for temperature extremes at Pudong International Airport. The current 0% crowd-implied probability for a specific high-temperature range appears to stem from a recent shift in the 48-hour forecast, which now suggests daily highs will cluster between 33°C and 37°C rather than reaching the extreme 40°C thresholds seen in prior years. This adjustment reflects a cooling trend in the shortwave solar energy input, which has risen only gradually to 5.6 kWh, limiting the potential for record-breaking spikes.

Historically, July in Shanghai delivers 7–15 days where highs exceed 35°C, with the average high sitting at 30°C and extremes occasionally hitting 40°C. The 0% probability likely misreads this baseline, as comparable cases from 2025 show a peak of 38°C, indicating that a high-temperature outcome remains plausible despite the current dip. Traders should watch the National Weather Service updates for ZSPD, specifically the 10:00 am reading of 81°F (27°C), which signals a slower morning ramp-up. Additionally, monitor the "plum rain" season announcements from local meteorological authorities, as sudden precipitation could suppress temperatures further, though the current humidity of 76% suggests muggy conditions that may sustain heat once the sun peaks.

The key catalyst remains the timing of the daily peak, which typically occurs around 3 PM. If cloud cover breaks between 11:00 AM and 5:00 PM, temperatures could surge toward the 37°C range, challenging the current market assumption. Traders must also track the wind speed, which is increasing from 11.3 to 12.4 mph, potentially aiding cooling but also dispersing heat. With the settlement window ending on 2026-07-09, the focus is on whether the day’s conditions align with the historical average or deviate due to the recent cooling trend. The market’s 0% stance may be an overreaction to the short-term forecast dip, ignoring the robust historical data that supports high-temperature outcomes in mid-July.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Shanghai on July 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.