Highest temperature in Tokyo on August 1?

Platform comparison

Market context

Tokyo’s top temperature today is what matters, with the market settling on the highest reading recorded at Tokyo Haneda Airport Station by 12:00 UTC. A 0% YES price implies the crowd is treating a first-August extreme as very unlikely, but that is best read as a view on the odds of a hot afternoon rather than on the month itself: Tokyo’s August averages are already high, with typical maximums around 31–34°C and frequent humidity-driven peaks above 30°C.[3][9][11][16]

The historical frame is that Tokyo can and does produce occasional outsized summer highs even if the mean is much lower. JMA’s Tokyo station record shows very hot August maxima in recent years, including a 34.4°C monthly average high in August 2025, while wider Japanese August records have reached 41.8°C in the past.[10][14] That makes a sub-1% style reading on Polymarket versus a blunt 0% on some books easier to interpret as a pricing convention issue than a statement that heat is impossible; Kalshi-style implied probabilities and Betfair/Smarkets decimal odds can diverge materially once fees and order-book depth are folded in.

Traders should watch the local forecast path for Tokyo, especially whether the day stays under persistent sun or develops cloud, rain, or sea-breeze moderation during the Japanese afternoon. Recent forecasts for 1 August pointed to highs around 31–31°C with humid conditions, which would keep the market far from any upper range triggers if verified at Haneda.[12][18][20] The main platform differences here are practical: Polymarket prices in direct probability terms, whereas Betfair and Smarkets quote decimal odds and their effective prices move with commission; access also depends on KYC and jurisdiction, with some venues broader in reach than others.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on August 1? 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 UK, 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.

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 UK 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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative UK 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.