Highest temperature in Guangzhou on July 25?

Platform comparison

Market context

Guangzhou will experience peak summer heat on 25 July 2026, with the settlement hinging on the single highest temperature recorded at Baiyun International Airport Station throughout that calendar day. The market's 0% crowd probability suggests either extreme confidence in a specific temperature range or minimal trading activity, a pattern common on niche weather contracts where liquidity concentrates around round-number thresholds rather than distributing evenly across bins.

Historical data from Guangzhou's meteorological records shows July temperatures at the airport station consistently exceed 33°C, with peaks frequently reaching 35–37°C during the height of summer. The city's subtropical monsoon climate produces remarkably consistent patterns; July averages sit near 28–29°C for daily highs, but extreme readings above 38°C occur roughly once per decade. This historical clustering explains why traders on Polymarket (which uses decimal odds and charges 2% maker/taker fees) and Kalshi (which operates under CFTC oversight with different fee structures) may have priced certain ranges as near-certain whilst leaving others untouched—the distribution of plausible outcomes is narrow enough that outlier bins attract minimal capital.

Traders should monitor China Meteorological Administration forecasts released in early July 2026, particularly any alerts regarding heat domes or anomalous pressure systems. Wunderground's historical data feed, the designated resolution source, occasionally experiences lag or revision during extreme weather events, though airport stations typically maintain reliable records. The settlement window closes at 12:00 UTC on 25 July, meaning traders cannot adjust positions after local morning observations become available.

Methodology

We read Highest temperature in Guangzhou on July 25? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.