Highest temperature in Tokyo on July 9?

Platform comparison

Market context

The peak daytime temperature recorded at Tokyo Haneda Airport on 9 July 2026 will determine this market’s outcome, with early July typically straddling the humid tail-end of the Tsuyu rainy season and the onset of hot, sunny Manatsu midsummer. Historical data shows Tokyo’s average highs in July range from 25°C to 33°C, often exceeding 35°C under heat dome conditions, while humidity consistently surpasses 75% [2][4]. The current crowd-implied probability of 0% YES suggests traders believe the temperature will fall below the market’s threshold, yet early July has frequently produced days well above 30°C, with urban peaks occasionally reaching 36°C or higher [3][6].

Traders should monitor the Japan Meteorological Agency’s daily heat forecasts and any emerging heat dome patterns, as these are the primary catalysts for extreme temperatures in Tokyo during this period [3]. Recent reports confirm Japan’s 2026 summer has already delivered record highs, including 40.2°C in Isesaki, 85km northwest of Tokyo, indicating a volatile thermal environment [3]. Platform mechanics diverge significantly here: Polymarket offers live quotes with 0% fees and USDC settlement via UMA oracle, while Kalshi requires US-only KYC and charges up to 7% per trade, and Betfair imposes 2–5% commission with full KYC from the first trade [1]. These structural differences in fee models, geo-accessibility, and settlement currencies directly impact liquidity and pricing efficiency for this weather-specific event.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on July 9? 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

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.

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. Kalshi Alternative 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.