Highest temperature in Guangzhou on August 17?

Platform comparison

Market context

Guangzhou will experience peak summer heat on 17 August 2026, with the settlement hinging on the highest temperature recorded at Baiyun International Airport's meteorological station. The market's 0% crowd probability suggests traders are either absent or systematically underweighting the likelihood of extreme heat during late summer in southern China. Resolution depends on Weather Underground's Daily Observations table rather than the Day High & Low summary—a distinction that matters when automated feeds diverge or station instruments record micro-fluctuations differently across platforms.

Historical August temperatures at Guangzhou Baiyun show consistent peaks between 32–36°C, with occasional spikes to 37°C during particularly intense heat waves. The 2013 and 2015 summers produced several days exceeding 35°C, establishing a baseline for what constitutes an outlier reading. Current crowd sentiment reflects either confidence that temperatures will remain within typical ranges or thin liquidity on this specific settlement window. Kalshi's decimal-odds format and Polymarket's implied probability display may explain some divergence in how traders perceive tail-risk scenarios; platforms with stricter KYC requirements sometimes show different probability distributions than those with lighter onboarding.

Traders should monitor China Meteorological Administration forecasts released in early August and any tropical cyclone activity in the South China Sea, which can suppress temperatures through cloud cover and rainfall. Baiyun's station elevation and urban heat island effects mean readings often exceed city-centre measurements. The settlement window closes at midday UTC on 17 August, creating a hard deadline for resolution data collection that leaves no room for late-day temperature revisions.

Methodology

This page compares Highest temperature in Guangzhou on August 17? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Kalshi Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.