Highest temperature in Tokyo on July 6?

Platform comparison

Market context

Tokyo’s summer of 2026 has already delivered a record-breaking heatwave, with the city hitting 36.8°C on Wednesday, marking the earliest extreme high for the season. This surge follows a national trend where 271 of Japan’s 914 observation points exceeded 35°C, with new highs recorded in 39 locations. The current crowd-implied probability of 0% YES for the Tokyo Haneda Airport Station reaching a specific high on 6 July reflects market scepticism about further spikes, yet historical data suggests caution is warranted.

Historical precedents frame this probability sharply: in July 2025, Japan recorded its highest-ever temperature of 41.2°C in Tamba City, Hyogo Prefecture, following the hottest June on record. Haneda’s typical July highs range from 79°F to 89°F (26°C to 32°C), with an average of 87°F (31°C), but recent anomalies show volatility. Traders comparing Polymarket’s decimal odds against Kalshi’s implied probability or Betfair’s fee structures should note that platforms diverge on how they price such tail risks, with some offering deeper liquidity for extreme outcomes.

Key catalysts to watch include the Japan Meteorological Agency’s daily heat advisories and the scheduled release of mid-July climate summaries, which could signal further warming trends. A recent Reuters report highlighted that Japan’s 2025 record was driven by a prolonged heat dome, a pattern potentially repeating in 2026. Platforms like Smarkets and RobinhoodPredictionMarkets differ in KYC reach and fee tiers, affecting how traders access these catalysts. Monitoring Wunderground’s real-time data for Haneda will be critical, as any deviation above 35°C could shift probabilities rapidly.

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Methodology

This page compares Highest temperature in Tokyo on July 6? 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

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.

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.

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.