Highest temperature in Tokyo on July 13?

Platform comparison

Market context

Tokyo faces its peak summer heat on 13 July 2026, with the market tracking the highest temperature recorded at Tokyo Haneda Airport Station. The crowd-implied probability of 0% for the current range suggests traders expect conditions to fall outside the offered bracket, likely due to forecasts indicating highs between 29°C and 31°C for the day[2][4]. AccuWeather projects July 2026 daily highs at Haneda ranging from 24°C to 33°C, aligning with typical mid-summer variability rather than extreme outliers[1].

Historically, Japan’s record heat reached 41.2°C in Tamba City in late July 2025, though urban Tokyo stations like Haneda rarely exceed 37°C even during intense heatwaves[3][8]. Comparable July 13 readings in recent years show Haneda peaking near 32–34°C, making the 0% probability a reflection of the bracket’s likely misalignment with expected norms rather than a prediction of cold weather.

Traders should monitor the Japan Meteorological Agency’s daily 6:00 AM UTC forecast updates and any sudden shifts in cloud cover or rain, as thundery showers are forecast for Monday 13 July[4]. Unlike Kalshi’s decimal odds and strict KYC, Polymarket uses implied probability with lower fees and no identity verification, while Betfair and Smarkets offer traditional bookmaker pricing but with higher commission structures on winnings. These structural divergences affect liquidity depth and price efficiency on this specific weather event.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on July 13? 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, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

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.

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.

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

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.