Highest temperature in Beijing on August 15?

Platform comparison

Market context

Beijing's daily maximum temperature on 15 August 2026 will be measured at the Capital International Airport Station and recorded in Weather Underground's Daily Observations table, with settlement determined by whichever temperature band contains the highest reading in degrees Celsius. The 0% crowd probability suggests traders currently expect the market's upper temperature thresholds to be implausible, though August typically sees Beijing peak temperatures between 28–35°C depending on monsoon activity and urban heat dynamics.

Historical August data from Beijing shows high variability: the city has recorded extremes ranging from 24°C to 41°C during the month across different years, with most readings clustering in the 30–37°C range. The current zero probability reflects either extreme confidence in a specific temperature band or sparse trading volume at the outer ranges. Cross-platform comparison reveals Polymarket's decimal odds format can obscure low-probability pricing compared to Kalshi's implied probability display, potentially explaining why this market shows no YES positions despite non-zero settlement possibilities.

Traders should monitor China Meteorological Administration forecasts released in early August 2026, as the East Asian summer monsoon's intensity directly influences Beijing's late-summer temperatures. Weather Underground's Daily Observations table—the binding resolution source—occasionally diverges from headline summaries, making direct source verification essential before settlement. Platform fee structures matter here: Kalshi's fixed-fee model versus Polymarket's percentage-based approach will affect position sizing for low-probability outcomes.

Methodology

We read Highest temperature in Beijing on August 15? 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

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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.