WindBorne Systems, a weather intelligence company developing a global atmospheric sensing network and AI-powered forecasting models, has raised $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, Biprogy, Lux Capital and existing investors.
Expanding AI Weather Forecasting
WindBorne operates a global network of more than 600 autonomous, long-duration sensing balloons that collect atmospheric data in regions with limited existing observations. Proprietary data powers WeatherMesh, an AI forecasting platform designed to provide earlier and more accurate insights into hurricanes, atmospheric rivers and other severe weather events.
Over the past year, WindBorne tripled revenue and tripled the size of the balloon network. WeatherMesh-6, launched in June 2026, currently ranks as the world's most accurate weather forecasting model based on 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 of 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."
Scaling the Global Sensing Network
New funding will support expansion of WindBorne's atmospheric sensing network, additional computing resources and development of future WeatherMesh models and weather intelligence products. Commercial adoption includes trading firms operating in weather-sensitive markets, while government demand continues to grow.
"We've believed since our earliest investment that better atmospheric data could transform weather forecasting," said Sven Strohband, Partner and Managing Director at 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 at 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."
Supporting Public Weather Infrastructure
WindBorne's atmospheric observations are already incorporated into NOAA's Global Forecast System, a major public forecasting system supporting numerous consumer weather applications. Continued network expansion is expected to provide broader atmospheric coverage and strengthen forecasting capabilities for governments, businesses and communities.