Highest temperature in Madrid on May 22?

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Market context

Madrid’s hottest reading on 22 May will be set by the Adolfo Suárez Madrid-Barajas Airport station, with settlement tied to the day’s final Wunderground record rather than any citywide average. Late May in Madrid is usually warm, but not extreme: long-run guides put typical May highs around 22-26°C, with the month often ending near 26°C and overnight lows in the low teens. That leaves the market centred on whether a brief afternoon spike reaches the upper 20s or low 30s Celsius, which is enough to move the outcome by one bracket even when the day starts mild.

The current 0% YES price should be read against a distribution that is usually skewed towards the mid-to-high 20s, not against record heat. For comparison, Madrid’s all-time high is 40.7°C, but that was a July extreme, and airport stations generally run a touch lower than central urban readings when the air is dry and skies are clear. On Polymarket, the quoted price is an implied probability; on Kalshi, the same event is shown in cents, with the same basic interpretation. Betfair and Smarkets usually price the same weather outcome through back/lay decimal odds, which makes very short-tail probabilities look less intuitive at first glance. Fees also matter: Betfair’s commission and Smarkets’ lower commission can change the executable price, while Kalshi’s KYC and US-only access remain narrower than Polymarket’s broader web-based access.

For the remaining hours before the noon UTC settlement window closes, the main watchpoint is whether Madrid sees strong insolation and light winds at the airport, which can lift the day’s maximum quickly if cloud cover stays limited. No special civic event is needed for the market to move; the key dependency is the local forecast and the actual hourly observations coming in before midday. If a late-morning cloud deck or breezier conditions hold down the temperature, the market should stay anchored in the lower brackets; if the sun breaks through early, the odds shift towards a hotter final print.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Madrid on May 22? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. Live odds come from the Polymarket order book; the other venues' contract details are maintained manually because their APIs aren't directly comparable. Every CTA routes to PolyGram, 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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.