Highest temperature in Beijing on August 12?

Platform comparison

Market context

Beijing's maximum temperature on 12 August 2026 will be measured at the Capital International Airport Station and reported in Weather Underground's Daily Observations table, with settlement determined by which temperature band the recorded high falls into. The 0% crowd probability suggests traders are either absent from this market or treating the outcome as predetermined, though August in Beijing typically sees highs between 29–34°C depending on monsoon activity and urban heat island effects.

Historical August data from Beijing shows considerable year-to-year variance. The city recorded 41.1°C in July 2010 during an exceptional heatwave, whilst August averages hover around 26°C for daily highs. Recent summers have trended warmer; 2023 saw multiple days exceeding 35°C in August. The specific resolution methodology—using Daily Observations rather than the Day High & Low summary—matters because station readings can diverge from headline figures by 0.5–1.5°C depending on measurement timing and sensor calibration. Traders comparing this market across platforms should note that Polymarket and Kalshi may display implied probabilities differently despite using identical underlying data; Kalshi's decimal odds format sometimes obscures probability shifts that appear clearer on Betfair's fractional display.

Monitoring China's meteorological forecasts from late July 2026 will be essential, as the East Asian summer monsoon's intensity directly influences August precipitation and cloud cover—both suppressors of extreme heat. Any tropical cyclone activity in the Western Pacific during early August could redirect moisture northward, lowering Beijing's maximum temperature substantially. The settlement window closes at midday UTC on 12 August, creating a hard deadline for final observations.

Methodology

We read Highest temperature in Beijing on August 12? 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 mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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.

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.