Somewhere between the sinking coastlines of The Day After Tomorrow and the spreadsheet-obsessed traders of The Big Short sits a strange new market: one where a heatwave in Phoenix or a shrinking reservoir in Nevada comes with a live price tag.
On Kalshi and Polymarket, the weather itself now behaves like a stock chart, and increasingly, like something you can trade.
Kalshi Strikes A Deal With The Weather Channel
Kalshi recently reached an agreement with The Weather Company, owner of The Weather Channel, to use its data for settling weather-related contracts.
The category has grown fast: Kalshi reports that trading volume on weather and climate markets rose roughly 500% over the past year, putting the segment on pace for $1.1 billion annualized.
Company co-founder Tarek Mansour has described the broader ambition behind moves like this one as turning almost any disagreement into something people can trade.
The contracts will now surface inside the Weather Channel's own app, which reaches more than 330 million people worldwide.
Kalshi frames this as more than a novelty.
The company argues its markets double as a financial hedge for businesses exposed to extreme weather, and that the resulting price data can even sharpen forecasts.
"Weather is the ultimate equalizer," a Kalshi spokesperson said, arguing it touches everyone the same way.
From Heatwaves To Drying Reservoirs
The range of contracts goes well beyond daily highs and lows.
Some of the specific contracts already live on the two platforms include:
- How hot it gets in a given city on a specific day.
- How many climate-driven disasters the US logs in a year.
- Whether global warming stays under a set temperature threshold.
- How severe coral die-off gets in Hawaii.
- How far Lake Mead falls below its current record-low levels.
A Market Built On Weather
That range is exactly what worries climate researchers.
Rutgers historian Jamie Pietruska points out that weather looks like safer ground for these platforms than sports or politics, precisely because "there is a longstanding belief that the weather can't be controlled."
Pietruska draws a parallel to political coverage, where outlets like CNN already fold prediction-market data into their reporting. Something similar could take shape with weather, she suggests, with The Weather Channel folding Kalshi's market activity into its own forecasts, turning trading data into just another figure audiences see next to the five-day outlook.
Kalshi, Polymarket, and The Weather Company each reject claims of improper practice, pointing to internal policy and federal oversight meant to prevent conflicts of interest.
For now, weather remains a small share of total trading volume across both platforms. But it is also one of the fastest-growing corners of an industry that keeps searching for the next thing people are willing to put money on.
