Highest temperature in Beijing on July 23?

Platform comparison

Market context

Beijing’s hottest reading for 23 July will come from the airport station rather than the city as a whole, so traders should anchor on the day’s peak at Beijing Capital International Airport in Wunderground’s history feed. In summer, Beijing is typically hot and humid, with July averages around 27°C overall and daytime highs near 31°C, while heavy afternoon thunderstorms are common and can cap maxima if they arrive early enough.[2][5][8]

The current book is pricing **28°C** as the clear frontrunner at 78%, with **29°C** next at 19%, which implies a market expectation of a mid-to-high 20s outcome rather than a breakout heat spike.[1] That looks consistent with the climatology, where July is the hottest month and readings above 35°C do occur, but the more common range still clusters in the low 30s or upper 20s depending on cloud, rain, and timing.[6][8] On Polymarket, that probability is shown directly; on Kalshi or Smarkets, the same view is usually expressed through a contract price or decimal odds, which can make small moves easier to compare against fees. Betfair’s exchange structure can look cheaper on paper, but commission and liquidity matter more than the headline quote, while KYC and regional access often differ across platforms and affect who can actually trade this kind of weather market.

For traders, the key catalysts are the airport’s intraday weather pattern, especially whether convection builds before local afternoon and whether rain arrives during the warmest hours. July is Beijing’s wettest month, with frequent short thunderstorms and concentrated precipitation, so a decent-looking morning can still settle lower if cloud cover or showers limit the day’s maximum.[2][5][6] The practical cross-book angle is that Polymarket’s probability format and Kalshi’s price-based contract both react to the same forecast inputs, but fee schedules, funding rails and jurisdictional access can lead one venue to move first or trade wider than another.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Beijing on July 23? 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 Robinhood Prediction Markets, 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

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. Robinhood Prediction Markets has a different geo footprint and routes to Polymarket's order book at 0% fees.

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.