Highest temperature in Wellington on July 21?

Platform comparison

Market context

Wellington International Airport is recording a current temperature of 15°C on 21 July 2026, with strong south-south-westerly winds and cloudy conditions dominating the day [1]. The prediction market for the highest temperature on this date currently assigns a 100% probability to the 12°C range, despite the live reading already exceeding this threshold, suggesting a potential discrepancy between the market’s settlement logic and real-time data [2]. This divergence highlights how Polymarket’s implied probability model can sometimes lag behind immediate weather observations, whereas platforms like Kalshi or Betfair often utilise decimal odds that may react more fluidly to live updates.

Historical July temperatures in Wellington typically range between 7°C and 15°C, with the airport station rarely exceeding 18°C during midwinter [1]. The current 0% probability for “7°C or below” aligns with these norms, yet the market’s certainty on 12°C appears overly rigid compared to the volatility seen on Smarkets, where traders can adjust positions more dynamically as conditions shift. Such rigidity contrasts with Kalshi’s fee structure, which often incentivises faster price discovery through lower transaction costs for active traders.

Traders should monitor the Wunderground history page for the official daily maximum, as settlement depends solely on this source [2]. No new weather announcements are scheduled, but the persistent cloud cover and high humidity (71%) may suppress peak temperatures, reinforcing the 12°C outcome [3]. Platforms diverge here: Polymarket’s KYC requirements may limit participation compared to Betfair’s global access, while Smarkets’ lower fees could attract more speculative volume on marginal temperature shifts.

Sources: 1 · 2 · 3

Methodology

This page compares Highest temperature in Wellington on July 21? 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

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. Polymarket 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. Polymarket 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.