Highest temperature in Shenzhen on May 31?

Platform comparison

Active sub-markets

Market context

Shenzhen will experience late spring conditions on 31 May 2026, with the settlement hinging on the single highest temperature recorded at Bao'an International Airport that day. The 0% crowd probability across Polymarket suggests either extreme confidence in a specific temperature range or insufficient liquidity to establish meaningful odds. Kalshi's binary structure and Betfair's decimal odds framework would handle this differently—Kalshi typically requires yes/no framing, whilst Betfair's lay functionality allows traders to express scepticism about outlier temperatures more fluidly than Polymarket's categorical bins.

Historical May temperatures at Shenzhen Bao'an show a consistent pattern: highs typically range between 28–32°C, with occasional spikes to 33–34°C during early heat waves. The 2025 May dataset would provide the most relevant comparison, though broader 10-year averages indicate that temperatures exceeding 35°C on this date remain statistically rare. Traders should note that Wunderground's historical data occasionally diverges slightly from China Meteorological Administration records, though Bao'an's automated station is generally reliable. The settlement window closing at 12:00 UTC on 31 May creates a timing mismatch with local afternoon peaks, potentially affecting which temperature range captures the day's maximum.

Monitoring early-May 2026 weather patterns and any El Niño or monsoon forecasts issued by the China Meteorological Administration will signal whether unusual heat is building across southern China. Tropical systems approaching the South China Sea in late May could suppress temperatures, whilst high-pressure systems would elevate them. Smarkets' commission structure (4% on net winnings) versus Polymarket's variable fees may influence position sizing for traders confident in specific ranges.

Methodology

This page compares Highest temperature in Shenzhen on May 31? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to Polymarket Alternative UK, 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

Where can I trade this market with the lowest fees?

On Polymarket Alternative UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 it cost to trade on Polymarket Alternative UK?

Zero. Polymarket Alternative UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.