Highest temperature in Chengdu on July 20?

Platform comparison

Market context

Chengdu’s July climate typically delivers afternoon highs between 30°C and 35°C, with humidity often described as bochornoso (oppressive) and rainfall frequent on roughly 20 days of the month[1][2]. The 0% implied probability on the YES side for a specific temperature range suggests the crowd expects the peak to fall outside that bracket, likely because historical data shows afternoon highs rarely exceed 33°C in sustained heat events, though occasional spikes to 35°C occur[1][3]. On platforms like Kalshi, this would be expressed as decimal odds (e.g. 1.00 for NO), whereas Polymarket uses implied probability directly; Betfair and Smarkets would list fractional or decimal odds with different fee structures and KYC thresholds, creating divergent liquidity profiles for this weather event.

Traders should monitor daily Wunderground updates for the Chengdu Shuangliu International Airport Station (ZUUU), the official resolution source, as real-time temperature logs can shift expectations if a heatwave breaks the 33°C ceiling[1]. While no specific weather announcement is scheduled for 20 July 2026, the broader pattern of 50% daily rain probability and 75% relative humidity in July means cloud cover could suppress peaks, making the 0% YES probability plausible unless a sudden dry, hot surge occurs[2]. Unlike Kalshi’s regulated US market, Polymarket’s global access allows faster reaction to such micro-climate shifts, but with higher counterparty risk; Betfair’s liquidity may be thinner for niche weather markets compared to Smarkets’ lower fees, affecting price discovery speed.

Sources: 1 · 2 · 3 · 4

Methodology

This page compares Highest temperature in Chengdu on July 20? 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 Kalshi Alternative UK, 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

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.

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

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