Highest temperature in Tokyo on July 23?

Platform comparison

Market context

The event is the highest temperature recorded at Tokyo Haneda Airport on 23 July 2026, with the market settling to the range that contains that day’s peak Celsius reading from Wunderground’s station history. A 0% crowd-implied YES suggests traders have not priced in any outcome band yet, but the underlying seasonal setup is straightforward: late July in Tokyo is usually hot, humid, and vulnerable to sharp afternoon highs, with Japan Meteorological Agency commentary recently warning that many areas could stay above 35°C into early August.[1][4][6]

For historical framing, this kind of summer Tokyo temperature market usually trades around the upper-30s bands rather than near the low-30s, because the city regularly experiences oppressive heat even when rain or cloud cover interrupts the daily climb.[1][4][6] On Polymarket, the same event is quoted as decimal-style probabilities across multiple temperature bins, so a 67% reading on “39°C or higher” is directly comparable to implied probability, while Kalshi and Smarkets typically present contract prices in a similar probability form but with different fee treatment and access rules; Betfair, by contrast, generally routes through exchange odds and commissions, so the all-in cost of expressing the same view can diverge even when the directional bias is identical. KYC reach also differs materially: Kalshi is US-facing with stricter verification, Polymarket access depends on jurisdiction and platform rules, and Smarkets and Betfair have broader retail exchange footprints in regulated markets.

The main catalysts are the short-horizon weather model runs, official heat advisories, and any shift in the Tokyo forecast around the settlement window, because one hot afternoon can move the relevant band decisively. Traders should watch whether daytime maxima at Haneda are forecast to break the mid-to-high 30s, and whether cloud, rain bands, or a sea-breeze pattern cap the peak below the upper-end bins. In practical terms, the market’s sensitivity is concentrated in the final forecast updates before the close, when the price will reflect the expected single-day high rather than the broader monthly climate backdrop.[1][5][6]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Tokyo on July 23? 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 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. 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.

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.