Written with insights from Robert Mackay, our parametric insurance expert
A vessel is waiting outside the port at anchorage. Its cargo is ready, the berth is allocated. Everything is lined up to start operations. Then the delays begin.
Swells – long, slow-moving waves generated by distant weather systems – can delay access to the berth. Wind narrows the crane operating window, while rain halts the loading of moisture-sensitive cargo. Nothing is damaged, no incident occurs, and no claim is triggered in the traditional sense. Yet in bulk shipping, time quickly turns into cost.
The most expensive weather in bulk shipping is rarely extreme. Everyday weather delays remain one of the most persistent and underestimated costs in maritime operations.
The misconception around weather risk
Weather risk in shipping is often framed around extremes: storms, groundings, or major disruptions. These events are visible, measurable, and typically insurable.
In practice, the cost that erodes margins most consistently comes from far more ordinary conditions. A few hours lost here, a day delayed there. Weather that is not exceptional, just operationally disruptive.
Across a single port call, this may seem manageable. But for a Capesize vessel, five days of weather delay at around USD 25,000 per day on demurrage can quickly reach USD 125,000. The number grows fast. Across multiple voyages, it becomes a structural issue rather than a one-off disruption.
Where the cost actually appears
To understand this exposure, it is not enough to look at the weather itself. What matters is how weather interacts with the commercial framework of the voyage. At the centre of this is laytime: the agreed window in which cargo operations must be completed before additional costs begin.
When the vessel is declared ready, the clock starts. Once that time is exceeded, the vessel enters demurrage: a fixed daily cost payable for delays beyond the agreed limit. This is where weather becomes financially visible.
Rain during operations may suspend work and pause the laytime clock under a “weather working day” clause. Once laytime has expired, however, the same delay can directly increase demurrage costs for the charterer.
Even before arrival, time spent waiting at anchorage due to swell, wind, or poor visibility may or may not count, depending on clauses such as WIBON or WIPON. These can affect when the laytime clock starts, including whether a vessel is treated as ready while waiting outside berth or port.
Weather does not inherently create cost. It becomes cost through the charterparty.
A risk with no clear owner
This creates a structural challenge. Weather-driven delays are real, measurable, and frequent, but ownership of that risk is rarely fixed. It shifts between parties depending on vessel status, operational context, and contractual terms.
The operational and financial impact is clear, but the insurance response often is not. Traditional marine covers are not designed to address time loss without physical damage.
The challenge of measuring delay
Even identifying and quantifying these losses can be difficult in practice.
A typical port call generates multiple records: the ship’s log, terminal data, and the agent’s statement of facts. Each may describe the same disruption differently, turning inconsistency into a commercial issue.
If loss is inconsistently measured, it is also inconsistently allocated and rarely managed in a structured way.
Why this matters now
Climate change is making weather volatility a more practical concern for maritime operators. The issue is not only the increase in extreme events, but also the way shifting weather patterns make routine disruptions harder to predict and manage.
For ports and shipping operations, this can mean narrower operating windows, more frequent stoppages, and tighter vessel rotations. Delays that were once absorbed as part of normal operations are becoming more visible on the balance sheet.
This is especially relevant for bulk and breakbulk operators, where small delays can quickly compound across voyages, contracts, and counterparties. In a changing weather conditions, the question is not only if weather will cause disruption, but whether the financial consequences are anticipated before the delay occurs.
What operators should be asking
For our team at FDR, this is where the conversation becomes important. Not only if a loss is insured, but whether the exposure is visible, understood, and allocated before it becomes a dispute.
-How do laytime and demurrage clauses treat weather delays?
-Are weather stoppages consistently recorded across the ship’s log, terminal records, and statement of facts?
-Is uninsured financial exposure being tracked as a recurring operational risk?
A different way of looking at weather risk
Weather-driven delay challenges a common assumption in maritime risk management: that financial loss requires physical damage. In this case, nothing is damaged, but value is still lost.
Managing this exposure means connecting operational realities with contractual structures and understanding how financial impact is created and allocated. It is not solely an insurance question, but one of visibility, contractual clarity, and control.
The cost of “normal” weather can no longer sit in the background, with UN Trade and Development warning of increasingly chronic port disruption. For bulk and breakbulk operators, it is a recurring exposure that must be understood before it turns into a dispute.
Curious to know more about how to navigate this risk with clarity and confidence? Explore our Parametric Insurance solutions page or reach out to Robert Mackay (robert.mackay@fdr-risk.com) for more information.
