WindBorne Systems, a startup that gathers atmospheric measurements using long-endurance weather balloons and low-cost sensors, has closed a $37 million Series B round, CEO John Dean told TechCrunch. The round was co-led by Khosla Ventures and Galvanize, with additional participation from TransLink Capital, Lux Capital and earlier backers; the company’s post-money valuation is $250 million.
Why this matters now
Advances in deep learning that underlie large language models have also enabled weather simulation approaches that can run on far less powerful hardware than the supercomputers traditionally required. WindBorne is using those modeling advances together with its proprietary observations to produce its own forecasts — a capability that was previously out of reach for most private firms because of computational cost.
Network and sensors: balloons and floating buoys
Since its founding in 2019, WindBorne has established about 20 launch sites worldwide and typically keeps roughly 600 balloons aloft at any given time, collecting measurements from hard-to-reach places such as the eye of a typhoon. The company is also deploying airborne sensor packages designed to descend into the ocean and continue taking measurements as floating buoys.
John Dean characterizes the combined dataset — the company’s own measurements plus public datasets from government meteorological agencies — as a “planetary nervous system.” He says adding balloon observations improves forecast accuracy and that the value per data point from balloons can exceed that of satellites.
Customers and revenue model
WindBorne’s primary customers today are government agencies. The U.S. National Weather Service purchases the company’s data, while the U.S. Air Force and U.S. Navy fund research partnerships that include developing forecasting models suitable for running onboard ships with intermittent connectivity.
Dean notes the company has been growing revenue alongside its data collection work, which has helped de-risk the investment case for venture capital.
Moving toward commercial markets
The new funding will be used for compute costs, to replace the balloon network’s satellite communications with a mesh radio network, and to expand the go-to-market team to reach private-sector customers. Initially, the company is focusing on commercial clients such as investment funds that use weather data to forecast commodity prices and other business outcomes.
Challenges in selling sensing data to the private sector
Over the last decade, multiple startups have attempted to scale sensing businesses — for example, earth-observing satellite constellations — but many have struggled to penetrate the private market. Extracting economic value from raw sensor data typically requires domain expertise and established workflows, so many providers lean on government customers who already know how to use the data.
Private weather companies do exist but commonly make most of their revenue by repackaging or refining government forecasts for clients like news organizations, aviation operators (de-icing), ship routing services, or speculative traders. WindBorne and its investors believe AI could change that dynamic by making it easier to connect forecasts to concrete business decisions.
Saloni Multani, a partner at Galvanize who co-led the round, said the private weather market has been limited because integrating forecasts into broader business decision-making has traditionally been expensive and difficult. Better forecasts increase the potential return on integrating weather, and AI lowers the technical barrier to linking forecasts to the decisions businesses need to make.
What to watch next
Key indicators to watch in the coming months include whether WindBorne can translate government contracts and validation into scalable commercial revenue, and how effectively it can transition communications off satellites to a radio mesh. Both technological execution and market adoption will determine whether balloon- and buoy-based sensing becomes a durable component of commercial weather forecasting.
Quick facts
- Funding: $37 million Series B
- Lead investors: Khosla Ventures and Galvanize; others include TransLink Capital, Lux Capital and prior investors
- Post-money valuation: $250 million
- Founded: 2019
- Fleet and operations: ~20 launch sites, about 600 balloons aloft at a time
- Key customers: U.S. National Weather Service, U.S. Air Force, U.S. Navy
- Near-term priorities: ocean-deployable sensors, radio mesh communications, build commercial sales team
