Highest temperature in Shenzhen on May 31?

Platform comparison

Active sub-markets

Market context

On 31 May 2026, the highest temperature recorded at Shenzhen Bao'an International Airport will fall into one of several defined ranges. The market settles against historical weather data from Weather Underground, which archives hourly observations for this major transport hub in Guangdong Province. Shenzhen's subtropical climate produces consistently warm conditions during late May, with the city transitioning into its pre-monsoon season characterised by high humidity and afternoon thunderstorms.

Historical May temperatures at Bao'an Airport typically peak between 28°C and 34°C, with extremes occasionally exceeding 35°C during heat waves. The 0% crowd probability suggests either an absence of trading activity or that participants are avoiding commitment to specific temperature bands. On Polymarket, this reflects the platform's decimal odds format and its reliance on smaller trader pools for niche weather markets; Kalshi and Betfair tend to show more consistent liquidity on weather contracts, though their KYC requirements and regional restrictions differ. Smarkets' fractional odds presentation can obscure implied probabilities for casual observers, whereas Polymarket's percentage display makes the current vacuum in trading interest immediately apparent.

Traders should monitor China Meteorological Administration forecasts as May approaches, particularly any alerts for unusual heat or early monsoon activity. El Niño or La Niña conditions in the Pacific influence East Asian weather patterns and could shift seasonal norms. The settlement window closes at 12:00 UTC on 31 May, requiring traders to account for time-zone conversion between UTC and China Standard Time when assessing intraday temperature peaks.

Methodology

We read Highest temperature in Shenzhen on May 31? 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 quote comes directly from the Polygon order book; the other three are listed with their platform attributes — fees, KYC, settlement currency, payment options — because a 1:1 contract comparison without API access would be guesswork.

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). Polymarket Alternative routes every trade directly into Polymarket's on-chain settlement, which is why payouts land fastest.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket Alternative, 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.

Is this market available outside the US?

Polymarket Alternative is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket Alternative triggers a quick verification flow that finishes in minutes.