WindBorne Systems, the weather intelligence company building the world’s largest atmospheric sensing network and the AI models it powers, today announced $37 million in Series B funding, bringing total funding to more than $62 million. The oversubscribed round was co-led by Khosla Ventures and Galvanize, with participation from TransLink Capital, Lux Capital, and existing investors.
The funding comes as demand for more accurate weather intelligence continues to grow across both commercial and public sectors. As climate change increases the frequency and cost of extreme weather, governments and businesses alike are placing greater value on forecasts that enable better decisions before weather becomes risk.
WindBorne is building what it calls a planetary nervous system: a global network of autonomous, long-duration sensing balloons paired with proprietary AI models that continuously improve humanity’s understanding of Earth’s atmosphere. Because the balloons collect new data in places where it wasn’t previously available, WindBorne can provide earlier insight into hurricanes, atmospheric rivers, and other severe weather events before they reach populated areas. The end result of AI models powered by real data is forecasts that are materially more accurate than those available today.
The company has translated that vision into rapid momentum. Over the past twelve months, WindBorne tripled revenue while tripling the size of its global balloon constellation to more than 600 autonomous sensing balloons operating simultaneously. Just two months ago, the company also introduced WeatherMesh-6, now the world’s most accurate weather forecasting model according to publicly available benchmarks.
“We’re building something that has never existed before: a planetary nervous system that continuously observes Earth’s atmosphere and transforms those observations into dramatically better forecasts,” said John Dean, Co-Founder and CEO, WindBorne Systems. “Better forecasts do more than improve weather reports—they help shape billions of dollars of decisions across energy, transportation, agriculture, infrastructure, emergency response, and countless other sectors. This funding allows us to accelerate that mission.”
“We’ve believed since our earliest investment that better atmospheric data could transform weather forecasting,” said Sven Strohband, Partner and Managing Director, Khosla Ventures. “As AI models become increasingly capable, the quality of the underlying observations becomes even more important. WindBorne’s combination of proprietary atmospheric data and best-in-class AI creates an advantage that we believe will continue to compound over time.”
“Climate change is increasing the cost of uncertainty,” said Saloni Multani, Co-Head of Venture & Growth, Galvanize. “More accurate weather intelligence can help communities, businesses, and governments make smarter decisions before extreme weather strikes, strengthening resilience while reducing economic losses. We believe WindBorne’s team is building foundational infrastructure for a more resilient future, and we’re excited to support that vision.”
From Better Observations to Better Decisions
The financing will accelerate both the expansion of WindBorne’s sensing network and the continued development of WeatherMesh, its AI forecasting platform. WeatherMesh-6 currently outperforms both leading AI forecasting systems and traditional physics-based weather models while requiring significantly less computational power to train. The new capital will expand access to compute resources, accelerating the next generation of forecasting models and intelligent weather products built on WindBorne’s proprietary observations.
Trading firms have been among the earliest commercial adopters, recognizing the value of materially more accurate forecasts for weather-sensitive markets. At the same time, demand from government agencies continues to grow for both WindBorne’s observations and forecasting capabilities.
Today, WindBorne’s observations are assimilated into NOAA’s Global Forecast System (GFS), one of the world’s foundational public forecasting systems and the backbone for many consumer weather applications. As its atmospheric sensing network expands, WindBorne aims to build an increasingly complete picture of Earth’s atmosphere—creating the intelligence layer needed to help governments, businesses, and communities navigate an increasingly weather-dependent world.
About WindBorne
WindBorne Systems is a weather intelligence company building the planetary nervous system. The company designs, manufactures, and operates the world’s only constellation of smart, long-duration sensing balloons that power the leading AI global weather forecasts. WindBorne’s data is assimilated into government forecasting systems and used by government agencies alongside a growing base of commercial customers. Founded in Palo Alto and backed by Khosla Ventures and Galvanize, WindBorne is building the accuracy layer that modern weather forecasting has been missing. Learn more at https://windbornesystems.com/
About Khosla Ventures
Khosla Ventures is a venture capital firm focused on investments across artificial intelligence, healthcare, financial services, consumer, enterprise, climate, and frontier technologies. Headquartered in Menlo Park, California, it’s known for making early capital investments in startups such as OpenAI, Instacart, Affirm, DoorDash, and Block. Learn more at https://www.khoslaventures.com/
About Galvanize
Galvanize is a global asset manager investing at the intersection of energy innovation, resilience, and intelligence. The firm deploys capital across seed, venture, growth, public equities, credit, and real estate, combining investment expertise with deep in-house capabilities in technology, policy, and markets. Galvanize is built to identify opportunities created by structural change in the 21st century economy and convert them into long-term value. Learn more at https://galvanizeclimate.com/
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