Highest temperature in Shenzhen on August 12?

Platform comparison

Market context

Shenzhen will record a daily high temperature on 12 August 2026, measured at Bao'an International Airport Station and logged in Weather Underground's Daily Observations table. The current crowd probability of 0% suggests traders are pricing in either extreme confidence in a specific temperature range or insufficient liquidity to establish meaningful odds across the full distribution. This disconnect between zero probability and the certainty that *some* temperature will be recorded warrants scrutiny of how different platforms handle edge cases in weather markets.

Shenzhen's August climate is consistently hot and humid, with historical highs typically ranging between 32–35°C. The city's position on the Pearl River Delta exposes it to tropical weather systems, and August falls within the typhoon season, which can suppress temperatures through cloud cover and rainfall. Reviewing past August records from Bao'an station shows that extreme outliers above 37°C or below 30°C occur infrequently, establishing a baseline for evaluating the probability distribution. The 0% crowd reading may reflect traders anchoring to a narrow expected range rather than genuine certainty about the outcome.

Traders should monitor tropical cyclone forecasts issued by the China Meteorological Administration and track any typhoon warnings in the weeks preceding 12 August, as these directly influence daily highs. The resolution source's specificity—requiring Daily Observations rather than the Day High & Low summary—introduces a technical dependency that differs from how some competitors (Kalshi, Betfair) structure weather markets, potentially affecting settlement disputes. Weather Underground's data availability and any station maintenance schedules should be confirmed before the settlement window closes on 12 August at 12:00 UTC.

Methodology

This page compares Highest temperature in Shenzhen on August 12? 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 Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Polymarket 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.