Highest temperature in Shenzhen on July 6?

Platform comparison

Market context

The highest temperature recorded at Shenzhen Bao'an International Airport on 6 July 2026 will determine the outcome of this prediction market, with the contract currently priced at 0% YES on Polymarket. This on-chain conditional token, settled in USDC on the Polygon network, reflects a crowd consensus that the temperature will not fall within the implied range, despite the underlying event being a straightforward meteorological measurement.

Historical data frames this near-zero probability as a potential mispricing, given that July is Shenzhen’s hottest month with average highs reaching 32°C and daily maximums frequently exceeding 33°C[1][4]. Comparable cases from recent years show that temperatures below 30°C in early July are exceptionally rare, with official station data consistently recording readings well above this threshold[6]. The current 0% valuation ignores the robust seasonal pattern where subtropical highs drive intense heat across southern China[1].

Traders should monitor the upcoming typhoon forecast schedule and the subtropical high pressure system’s behaviour, as these are the primary catalysts for temperature deviations. Recent reports indicate that southern China has already experienced record-breaking highs, with 578 meteorological observatories recording new temperature peaks for the same period in history[8]. Any sudden shift in the monsoon front or an incoming typhoon could disrupt the expected heatwave, making the weather forecast from Wunderground a critical dependency for settlement[9].

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

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 Polymarket Legit?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.