Highest temperature in Shenzhen on July 17?

Platform comparison

Market context

Shenzhen’s highest temperature on 17 July 2026 will be recorded at Bao’an International Airport, with the market resolving to the Celsius range containing that peak. Today, Polymarket prices the contract at 0% for the YES outcome, implying the crowd expects no temperature to hit the implied threshold, while the frontrunner outcome is 27°C at 70% probability and 28°C at 21% [1]. This pricing reflects the on-chain mechanics of USDC settlement on Polygon, where conditional tokens trade against real-time weather data feeds.

Historically, July in Shenzhen sees daily highs averaging 32°C, with monthly averages around 32°C during the day and 26°C at night, though subtropical highs and typhoons often bring 17 rainy days and 339 mm of precipitation [2]. The current 0% YES probability aligns with past years where temperatures rarely dip below 27°C in mid-July, making lower ranges the market’s consensus. Traders should watch for typhoon forecasts from the China Meteorological Administration, as sudden storm systems can suppress peak temperatures, and monitor Wunderground’s daily updates for the Bao’an station, which serves as the official resolution source. Recent weather bulletins highlight increased typhoon activity in the South China Sea this week, a key catalyst that could shift probabilities if a system approaches Shenzhen [2].

Sources: 1 · 2

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 Kalshi UK. 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

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.