Highest temperature in Wellington on August 9?

Platform comparison

Market context

Wellington’s 9 August maximum temperature is usually a cool, narrow-range outcome rather than a dramatic weather event. Long-run August climate data put Wellington’s average high at about 12–14°C, with day-to-day highs commonly clustering in the low teens Celsius, while historical highs for the month have reached about 13°C in several datasets and around 14°C in others.[1][2][10][12] On Weather Underground’s own current August daily observations for Wellington, the first eight days of 2026 have mostly printed highs between 48°F and 61°F, with 61°F on 3 August and several other days in the low-to-mid 50s Fahrenheit, reinforcing that the market is usually about a temperature band near 11–16°C rather than an extreme tail.[6]

The current 0% crowd-implied probability for YES is best read as a platform-pricing artefact, not a statement that a Wellington airport reading above the listed threshold is impossible. On Polymarket, crowd probabilities are shown directly; on Kalshi and Betfair, traders often have to translate between decimal prices, implied probability and, on exchanges, the effect of fees and commission on realised value. Smarkets also quotes odds with commission rather than a simple headline probability, so small differences in how a market is priced can matter more than the raw forecast, especially in a low-volatility weather market like this one. The key comparator is the resolution method: this contract resolves from Weather Underground’s Daily Observations table at Wellington Intl Airport Station, which is more specific than the general summary figures used on many weather pages.[5][6]

For traders, the main catalysts are the airport’s actual observed midday warming, any overnight trough that limits the daily high, and whether the final Daily Observations entry is updated cleanly before settlement. Weather Underground’s monthly history page already shows 2026 daily entries for 1–8 August, so the last print on 9 August will likely be the decisive reference rather than broader forecast rhetoric.[6] AccuWeather’s August 2026 view shows Wellington highs in the low 50s to low 60s Fahrenheit across the month, which is broadly consistent with a tight market around the low-teens Celsius range, but the settlement will turn on the station record rather than forecast summary pages.[15]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in Wellington on August 9? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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.

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.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Robinhood Prediction Markets 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.