Highest temperature in Tokyo on July 27?

Platform comparison

Market context

Tokyo Haneda Airport Station’s highest temperature on 27 July will depend mainly on whether the city gets a normal late-July hot spell or a cooler, cloudier day. Tokyo in July typically sees daytime highs around 30°C to 33°C, but late-July peaks frequently reach 35°C to 38°C, so the distribution is skewed towards a hot outcome rather than a mild one.[1][2] That makes the current **0% YES** crowd price look detached from the seasonal baseline, unless traders are pricing in an unusually strong cooling pattern or an issue with the market’s specific temperature source.

For comparison, this is the sort of market where the venue matters as much as the weather. Polymarket quotes probability directly, so a 0% print means the crowd is assigning essentially no chance to the specified temperature range; Kalshi and Betfair usually express the same view through decimal prices or contract prices, with fees and access varying by venue, while Smarkets typically quotes in percentage-like terms but applies its own commission structure and KYC limits depending on jurisdiction. The key practical point is that all four can diverge around the same weather event because of different participant bases, account restrictions, and the fact that this market settles on *Haneda Airport station readings*, not broader Tokyo averages.

The main catalysts are the actual forecast evolution for central Tokyo, any late shift in humidity, cloud cover, sea breeze, or rain band placement, and the intraday high timing before the 12:00 UTC close. A market that settles on the day’s maximum is especially sensitive to morning cloud clearing or an afternoon spike, so traders should watch airport-specific forecasts rather than citywide averages. Current reporting on Japan’s July weather continues to describe warm, humid conditions with heavy precipitation risk in parts of the country, which can cap temperatures if cloud and rain persist, but it does not remove the possibility of a sharp midday rise in Tokyo.[2]

Sources: 1 · 2

Methodology

This page compares Highest temperature in Tokyo on July 27? 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 Polymarket 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

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.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.