Highest temperature in Shenzhen on August 4?

Platform comparison

Market context

Shenzhen’s maximum temperature on 4 August will be set by the hottest reading at Shenzhen Bao’an International Airport Station before the settlement cut-off, not by the day’s average or the city-wide forecast. Current public forecasts point to a very warm but not extreme day: a Guangdong regional bulletin issued this morning put Shenzhen at 25-29°C, while August climatology for the city typically sits around 31-32°C for daytime highs, with heavy rain and high humidity common in the month.[6][2][9]

That background helps explain why the market is pricing a 0% YES on the exact top-end bands: August in Shenzhen is usually hot enough for low-30s readings, but rain and cloud cover often cap the afternoon peak, especially at airport locations near the coast. On Polymarket, the contract is quoted by outcome probability, with the leading listed band currently around 29°C at 31% and 30°C at 21%.[14] On Kalshi or Smarkets, the same view would usually be expressed as a price or decimal-style quote rather than a direct probability, so a 0% implied chance there would still reflect whether any bids remain in the highest bands after fees.[14]

The main catalysts are the day’s actual temperature curve, the timing of showers or thunderstorm activity, and any late shift in the regional forecast from Guangdong or Hong Kong weather services. Shenzhen’s August pattern is dominated by rain days and occasional typhoon influence, so a brief sunny window could still lift the airport reading several degrees above the morning forecast.[2][17][20] In practice, traders should watch hourly observations at the airport station, because settlement depends on the single highest recorded value, not the forecast maximum.[14]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Shenzhen on August 4? 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 Robinhood Prediction Markets, 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

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.

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.

Which platform is accessible globally?

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

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. Robinhood Prediction Markets 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.