Highest temperature in Guangzhou on July 25?

Platform comparison

Market context

Guangzhou will experience peak summer heat on 25 July 2026, with the Baiyun International Airport Station recording a daily high that traders must bracket into discrete temperature ranges. Polymarket currently prices all outcomes at 0%, reflecting settlement window closure before the event occurs—a technical artefact of the contract's design rather than genuine uncertainty about whether a temperature will be recorded. The market exists to capture where that high falls across defined bands, with USDC collateral on Polygon backing conditional tokens that resolve based on Wunderground's historical weather data for that specific station and date.

Guangzhou's July temperatures cluster reliably between 32–36°C, with occasional peaks above 37°C during particularly intense heat waves. Historical data from the past decade shows the city exceeds 35°C on roughly 70% of July days, whilst readings above 38°C occur in approximately one in five years during the month. The 2022 summer saw sustained highs of 36–37°C throughout July, providing a recent comparable baseline. Traders should weight the likelihood of each temperature band against these seasonal patterns rather than treating outcomes as equiprobable.

Catalysts affecting the final reading include the strength of the Western Pacific subtropical high-pressure system and any tropical cyclone activity in the South China Sea during late July. The China Meteorological Administration issues 10-day forecasts in mid-July that typically narrow uncertainty bands. El Niño or La Niña conditions influence regional atmospheric circulation; the current neutral phase suggests near-normal temperatures, though this can shift. Traders should monitor seasonal forecasts released by the CMA in early July 2026 for directional guidance on whether conditions favour above or below-average heat.

Methodology

This page reviews Highest temperature in Guangzhou on July 25? 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 Kalshi UK, 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

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.

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.

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.