How Does Weather Affect Laser Weapons? A More Important Question Than It Seems

How Does Weather Affect Laser Weapons? A More Important Question Than It Seems

April 08, 2026

By Aaron Westman, Senior Director of Business Development at AV

One of the most common questions I'm asked about laser weapon systems is simple:

How do they perform in bad weather?

At first glance, this appears to be a straightforward technical question. In reality, it's not. Because laser weapons don't operate in isolation-they operate within a broader contest between offensive and defensive systems, where environmental factors shape outcomes on both sides.

Weather is one of the most important of those factors. And historically, it has tended to favor the defender.

From Napoleon's invasion of Russia to the D-Day landings, adverse weather has repeatedly slowed maneuver, disrupted coordination, and degraded the timing and precision required for offensive operations. Attacking forces depend on synchronization, visibility, and reliable sensing-all of which are vulnerable to environmental conditions.

Defensive systems, by contrast, are designed to absorb uncertainty.

This distinction is critical. Weather does not uniquely disadvantage laser weapons-it affects all systems. But in many cases, it degrades the attacker more than the defender. And because laser weapons are inherently defensive tools-providing speed-of-light engagement, precision, and persistent coverage-they often benefit from this dynamic on balance.

This is not just theoretical. It is consistently observed in testing and operations.

In ongoing evaluations of the LOCUST laser weapon system, high wind conditions degrade small UAS performance-impacting stability, navigation, and sensor effectiveness-well before degrading the laser system's ability to to track and engage them. Similarly, reduced visibility conditions like haze, fog, or cloud cover undermine onboard sensors of small drones long before the more capable sensing and tracking systems of modern laser weapon platforms.

This is not to suggest laser performance is unaffected by weather. All systems are affected by environmental conditions. The key point is comparative: in operationally relevant scenarios, the threat system is degraded more than the defensive weapon engaging it.

This conclusion may seem counterintuitive, but it reflects a broader reality across modern warfare.

Over the course of two decades working with drones, radars, and directed energy platforms, I have yet to encounter a system that is immune to weather. Which raises an important question: why are laser weapons often characterized as "fair weather" systems?

One possible explanation is laser weapons rely on optical systems to complete their kill chain. But this is not unique.

Most modern targeting and guidance systems depend on optical sensing in some form. From the human eye to widely deployed munitions such as Hellfire, AIM-9 Sidewinder, and Stinger, optical and infrared sensors are fundamental to detection, tracking, and engagement across the battlefield.

Even systems that rely primarily on radio frequency (RF) sensing are not immune to environmental effects. Operators of advanced radar systems understand well that atmospheric conditions including precipitation, humidity, and turbulence can impact performance, detection range, and track quality. No sensing modality operates outside the influence of weather.

A related concern exploitation of weather by an attacker to achieve surprise or concealment.

In such scenarios, passive systems become particularly valuable. Laser weapons rely on passive sensing for detection and tracking, meaning they don't emit signals detectable by an adversary. They can continuously observe the environment without revealing their position, even when operating in degraded conditions.

By contrast, active sensing systems such as radars inherently emit energy, making them detectable and targetable. As a result, these systems are often employed with emission control considerations, which can limit their availability at critical moments.

Looking ahead, the more important question is not how any single system performs in ideal conditions, but how systems perform in the environments where future conflicts are most likely to occur.

Will those conflicts be fought in good conditions-or in contested, uncertain, and degraded environments?

What attributes will matter most: magazine depth, persistence, survivability, and precision under imperfect conditions?

When viewed through that lens, laser weapon systems offer a compelling set of advantages. Their deep magazine, passive sensing approach, and speed-of-light engagement enable persistent defensive coverage without the logistical and operational constraints associated with traditional interceptors.

Integrated in a layered air defense architecture, these attributes enhance resilience and reduce overall system vulnerability, particularly in the face of increasingly numerous and low-cost aerial threats.

Ultimately, the value of any defensive system lies not only in its ability to perform, but in its ability to deter.

By improving the reliability, persistence, and cost-effectiveness of air defense in real-world conditions, including adverse weather, laser weapons can contribute meaningfully to that objective.

And effective deterrence remains the most important outcome of all.

ABOUT THE AUTHOR

Aaron Westman is an engineer and leader specializing in counter-UAS and directed energy systems. He has played a key role advancing mobile laser weapon integration and operational deployment, supporting a variety of cross-domain capabilities that improve precision engagement and layered air defense.

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