2026-03-18 7 min read
If you've lived in Petaluma for more than a year, you already know the weather doesn't stay the same for long. We get drenched from November through March. February alone averages nearly 3.5 inches of rain. and then the switch flips and we bake through a long, arid summer with virtually zero rainfall in July and August. That seasonal whiplash is hard on a lot of things, and your garage door is no exception.
This isn't a generic weather article. The specific climate patterns in Petaluma and the surrounding Sonoma County area create real, predictable problems for garage doors. Understanding what's happening and when can save you from an expensive emergency repair. or a door that simply won't open on a rainy Monday morning.
Petaluma's wet season brings a combination of rainfall, marine fog rolling in from the coast, and elevated humidity. March averages a relative humidity of around 77%. That moisture works on your garage door in a few different ways.
Springs, hinges, tracks, and rollers are all made of metal, and they sit right in the path of every rainstorm. When humidity is consistently high, those components are susceptible to rust and corrosion. Springs may weaken and break sooner than expected, while rollers and hinges can become stiff, making the door harder to open or close. If you've noticed your door sounding rougher or moving unevenly after a stretch of wet weather, this is often the culprit.
The fix isn't complicated: apply a silicone-based lubricant to all moving metal parts at least twice a year, ideally at the start of the rainy season in late October and again in spring. Avoid WD-40 for this. it's a solvent, not a true lubricant, and it can actually strip protective coatings.
For a deeper look at which components are most at risk and how to spot early failure, check out our guide to garage door spring replacement.
Petaluma has no shortage of older homes. West Petaluma especially is full of historic Queen Annes, Craftsman bungalows, and Victorian-era houses, many of which feature original or period-style wood garage doors. Wood garage doors are particularly vulnerable to moisture. they absorb it from the air, causing the panels to swell and warp. Over time, this cycle of expansion and contraction leads to cracking, paint failure, and doors that stick or won't seal properly at the bottom.
If you have a wood or wood-look door, inspect the finish every fall before the rains hit. A quality water-based sealant or exterior paint in good condition is your first line of defense. Any chips or cracks in the finish need to be addressed before the wet season, not after.
Over time, weather seals harden and crack, letting in drafts and moisture. In Petaluma's rainy winters, a failed bottom seal isn't just an inconvenience. water can pool inside your garage, damaging stored items and promoting mold growth. Check the bottom seal and side weatherstripping each fall. If the rubber is cracked, flattened, or pulling away from the frame, it's time to replace it. This is one of the cheapest repairs you can do, and one of the most impactful.
From June through September, Petaluma flips to warm, arid conditions with long sunny days and very little cloud cover. Summer heat creates its own set of problems.
Metal expands in heat, and garage door tracks and panels are no different. Heat causes expansion in panels, springs, and tracks. and when those components expand unevenly, it can cause your door to bind, jump off track, or close unevenly. If your door runs smoothly in winter but starts acting up in July or August, thermal expansion is a likely cause.
Keeping rollers and hinges well-lubricated matters in summer too. Lubrication reduces friction, which reduces the heat buildup caused by metal-on-metal contact.
Sonoma County summers mean a lot of direct sun exposure. UV rays fade paint, break down powder-coated finishes, and can cause plastic components. including certain weather seal materials. to become brittle over time. If your door faces south or west and gets direct afternoon sun, this aging happens faster. A quality exterior paint or protective UV coating applied every few years goes a long way.
Given Petaluma's distinct wet and dry seasons, the most practical approach is a two-check-per-year routine:
- October (pre-rain): Lubricate all moving parts, inspect and replace weatherstripping, check bottom seal, look for any surface rust, and test the auto-reverse safety function. - May (post-rain, pre-heat): Re-lubricate, inspect tracks for any warping or misalignment, check panel finish for chips or peeling, and test opener sensitivity.
For a more detailed breakdown of what to look for at each step, our garage door maintenance tips for Petaluma homeowners covers the full checklist.
If you're seeing issues that go beyond basic maintenance. unusual noises, a door that won't stay balanced, or visible rust on springs. it's worth getting a professional set of eyes on it before the problem compounds. You can schedule a service visit with the Garage Door Petaluma team and we'll give you an honest assessment of what actually needs attention versus what can wait.
Q: My garage door started making a grinding noise right after the rainy season ended. What's going on?
A: This is one of the most common calls we get in spring. Months of elevated humidity cause metal-on-metal components. especially rollers running in tracks. to develop light surface rust or stiffness. A thorough cleaning and lubrication with a silicone-based spray usually resolves it. If the noise persists, it may indicate that rollers are worn and need replacement.
Q: The bottom of my wood garage door looks swollen and the door doesn't close flush anymore. Can this be fixed without replacing the whole door?
A: In many cases, yes. If the swelling is limited to the bottom panel and the wood structure is otherwise sound, a professional can often sand down the swollen area, re-seal the wood, and adjust the door's travel limits so it closes properly. However, if the swelling is severe or the wood has begun to rot, panel replacement may be the better long-term value.
Q: How do I know if my weatherstripping needs to be replaced versus just cleaned?
A: Run your hand along the weatherstripping. it should feel pliable and slightly spongy. If it's hard, cracked, or if you can see daylight around the door frame when the door is closed, it's time to replace it. Cleaning can remove surface grime but won't restore flexibility to rubber that has hardened with age.