Highest temperature in Shenzhen on July 17?

Platform comparison

Market context

Shenzhen faces its peak summer heat on 17 July 2026, with the market betting on the highest temperature recorded at Bao'an International Airport. Despite a crowd-implied probability of 0% for the "YES" outcome on a specific unlisted threshold, the frontrunner on Polymarket is 27°C at 70%, followed by 28°C at 21%[1]. This divergence suggests the 0% figure likely refers to a higher, unattainable threshold rather than the event itself, as historical data shows July averages in Shenzhen reach 31.1°C with lows of 26.2°C[2].

Historical July patterns in Shenzhen consistently deliver hot, humid conditions with average daily highs of 31.1°C, making lower thresholds like 27°C statistically probable rather than anomalous[2]. The current 70% weighting on 27°C aligns with typical early-morning or cloud-covered readings, whereas the 0% implied probability for a higher, unspecified range contradicts the region's established thermal baseline. Traders comparing Polymarket against Kalshi should note this misalignment, where the frontrunner suggests a moderate peak rather than the extreme heat often seen in mid-summer.

Key catalysts include real-time updates from Wunderground, the designated resolution source for the Bao'an station's daily maximum[1]. Traders must monitor morning cloud cover and potential typhoon activity, which frequently suppress temperatures in the Pearl River Delta during July. No specific weather announcements are scheduled for today, but the settlement window closing at 12:00:00Z on 17 July 2026 requires immediate attention to the final hourly reading. The market's reliance on Wunderground history means any data lag or station anomaly could skew the final resolution against the 70% consensus.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Shenzhen on July 17? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is PolyGram. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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.