2026-03-19 7 min read
If you've lived in Cerritos for any length of time, you already know the sun is not a seasonal visitor. it's basically a permanent resident. With summers that push into the low-to-mid 80s and a climate that stays warm and dry for most of the year, your garage door is absorbing UV radiation and radiant heat almost every single day. Most homeowners don't think about this until the paint starts chalking, the panels start warping, or the opener starts acting up on a hot afternoon. By then, the damage is already done.
Understanding what the sun actually does to your garage door. and how to get ahead of it. can save you real money. Here's a straightforward breakdown.
The sun attacks your garage door in two distinct ways: ultraviolet radiation breaks down materials at a molecular level, and heat causes physical expansion and contraction that stresses every moving part.
This is usually the first thing homeowners notice. UV rays break down the chemical bonds in paint, causing colors to fade and surfaces to chalk or crack over time. On steel doors, once that protective coating degrades, the bare metal becomes vulnerable to moisture. and even in a relatively dry area like Cerritos, winter rainfall between October and March brings enough moisture to start surface rust on an unprotected door. On wood doors, the problem is more severe: UV rays break down lignin, the compound that holds wood fibers together, leading to surface graying and deep structural cracks.
Metal expands in heat. That might sound like a minor physics fact, but for your garage door it has real consequences. Tracks, rollers, and hinges all grow slightly in the summer heat, which changes how the door moves through its path. A door that operated quietly in March may start grinding or jerking by August. This constant expansion and contraction also accelerates wear on your garage door springs. components that are already working under significant tension every time the door cycles.
Here's one homeowners are often surprised by: direct sunlight can interfere with your garage door's safety sensors. The infrared beam connecting the two sensors can be overpowered by direct sunlight, causing the door to refuse to close. Beyond that, prolonged exposure to high temperatures can damage the electronic components inside both the sensors and the opener's circuit board itself, causing unpredictable behavior or outright failure.
Cerritos sits in the heart of the Los Angeles Basin, and its Mediterranean-type climate means the sun is intense and consistent. The city's residential streets. many lined with classic California ranch-style homes and two-story houses built in the 1970s and 80s. often have garages that face south or west. A west-facing garage door takes the hardest hit: full afternoon sun during the hottest part of the day, for months on end. Homes in the ABC Streets neighborhood and along the wider corridors near the 605 freeway are particularly exposed on corner lots where shade from neighboring structures is minimal.
Homeowners in nearby Artesia and La Palma face the same climate, so this isn't a Cerritos-exclusive issue. but it does mean that most doors in this area are aging faster than their manufacturers' estimates, which are typically based on more moderate conditions.
If your door is reaching the end of its life, material choice matters. Steel doors with baked-on enamel finishes hold up better under sustained UV exposure than basic painted finishes. Composite doors offer the look of wood without the same vulnerability to cracking and warping. Check out our guide on choosing the right garage door for your home for a deeper look at how materials compare in warm climates.
For existing doors, UV-blocking paint and sealants create a barrier between the sun and the door surface. On a steel door, this means repainting with a high-quality exterior paint that includes UV inhibitors when you start seeing fading or chalking. On a wood door, a quality sealant with UV absorbers should be reapplied every one to two years. more frequently if the door faces west or southwest.
If your door refuses to close on bright afternoons, sunlight interference with the safety eyes is the most likely culprit. Small sun shields. available at most hardware stores. attach directly to the sensor housings and block the angle of direct light without interfering with the beam itself. It's a five-minute fix that prevents a frustrating daily problem.
Hot weather causes lubricants to thin out and lose viscosity, which means your rollers, hinges, and spring hardware get less protection exactly when they need it most. Use a silicone-based or lithium-grease lubricant rated for high temperatures, and reapply it more frequently in summer. Avoid WD-40. it's a solvent, not a lubricant, and it evaporates quickly in heat.
Strategically placed shrubs or an awning over your garage can reduce direct sun exposure significantly. If you're landscaping anyway, deciduous trees on the west side of the property provide summer shade while letting winter light through. Even a modest overhang helps extend the life of both the door and the hardware beneath it.
If you're not sure how much damage has already been done, or you're seeing early warning signs of trouble, it's worth having a technician take a look before a cosmetic issue becomes a structural one. Garage Door Cerritos offers inspections for homeowners who want a clear picture of where things stand. You can schedule a visit without any obligation.
Q: How often should I repaint or reseal my garage door in Cerritos? A: For steel doors, plan on repainting every 5,7 years, but inspect annually for fading or chalking. the SoCal sun can accelerate that timeline. Wood doors need a UV-resistant sealant or stain reapplied every 1,2 years to prevent cracking and graying.
Q: My garage door won't close on sunny afternoons but works fine in the evening. What's happening? A: This is almost certainly sunlight interfering with your safety sensors. The infrared beam can be overpowered by direct sunlight, which makes the opener think there's an obstacle. A sun shield on the sensor or repositioning it slightly usually solves the problem. If the issue persists, the sensor itself may be heat-damaged and need replacement.
Q: Does the color of my garage door affect how much sun damage it takes? A: Yes, meaningfully so. Darker colors absorb significantly more heat than lighter ones, which accelerates both paint degradation and thermal stress on the panels and hardware. If you're replacing or repainting, choosing a lighter color. or one with a light-reflective finish. is a practical way to reduce long-term wear.