Highest temperature in Tokyo on July 28?

Platform comparison

Market context

Tokyo's peak temperature on 28 July 2026 will be measured at Haneda Airport Station and resolved against historical weather data from Wunderground. July typically ranks among Tokyo's hottest months, with average highs around 32°C and extreme readings occasionally exceeding 37°C. The 0% crowd probability suggests either minimal trading activity on this particular date-specific weather contract or that traders are awaiting clearer seasonal forecasts before committing capital.

Historical July temperatures in Tokyo show considerable year-to-year variance. The city recorded 37.5°C on 23 July 2023 and 36.4°C on 16 July 2022, establishing that mid-to-high 30s readings occur regularly during peak summer. Weather prediction markets typically see liquidity concentrate around round-number temperature thresholds (30°C, 35°C, 40°C bands), which affects how different platforms price adjacent ranges. Kalshi's binary structure differs markedly from Polymarket's categorical approach here—traders on Kalshi would face yes/no propositions on specific temperature floors, whilst Polymarket's range-based settlement allows finer granularity but requires interpreting multiple overlapping outcomes.

The Japan Meteorological Agency publishes seasonal forecasts in June, with updates through July that influence trader positioning. El Niño or La Niña conditions, tracked by NOAA, materially shift summer temperature expectations across East Asia. Traders should monitor late-June 2026 forecasts and any typhoon activity in early July, as both affect atmospheric patterns driving peak daily temperatures. Wunderground's historical data feed, the stated resolution source, updates daily and remains accessible without geographic restrictions—a key advantage for international traders comparing this market across Polymarket, Kalshi, Betfair, and Smarkets platforms.

Methodology

We read Highest temperature in Tokyo on July 28? 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.

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.

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.