2026-03-19 6 min read
If you've lived in National City for more than a year, you already know that our weather is mild for most of the calendar. but when the rains arrive between December and March, they can arrive fast and hard. The city learned this the difficult way in January 2024, when an intense rainstorm dropped over four inches of rain in just a few hours, overwhelming stormwater systems and flooding low-lying neighborhoods across town. For homeowners, that kind of event doesn't just mean wet floors. it exposes every weakness in a garage door that's been quietly ignored all year.
Most of National City's housing stock is older. As one of San Diego County's oldest incorporated cities, the homes here. from the historic blocks near Old Town to the established neighborhoods around Las Palmas Park. often have garage doors and hardware that have been in place for a long time. Older doors and aging hardware have less margin for error when the wet season hits. A few hours of prep can prevent a service call at the worst possible time.
Here's a practical checklist to work through before and during the rainy season.
The bottom weatherstrip. the rubber or vinyl strip running along the base of your door. is your first line of defense against rainwater intrusion. After months of dry Southern California weather, these seals dry out, crack, and lose their flexibility. When a heavy rain comes, a compromised bottom seal lets water pour under the door and into your garage.
Get down and take a close look. If the seal is cracked, hard, or no longer lying flat against the concrete, replace it. This is one of the few garage door maintenance tasks that most homeowners can handle themselves. replacement seals are available at hardware stores and typically just slide or screw into place along a retainer channel.
While you're at it, check the side and top weatherstripping as well. Any gaps let in not just water, but also the damp, salt-tinged air that's common throughout the South Bay during storm systems.
Water and debris tend to collect in the bottom section of the vertical tracks during heavy rain. Over time, this leads to rust, grit buildup, and rollers that drag instead of roll smoothly. Run a rag along the inside of both tracks to check for gunk and rough spots. If you notice rust or visible corrosion on the tracks, that's worth addressing now. corroded tracks lead to misalignment, which can cause the door to bind, jump the track, or refuse to close fully.
If the rollers are noisy or look worn, the rainy season is a good time to have them swapped out. Steel rollers rust faster than nylon rollers in wet conditions, so if yours are steel and showing wear, upgrading to nylon is a worthwhile investment for South Bay homeowners.
Lubrication isn't just about preventing squeaks. it's about keeping moisture out of the joints between moving metal parts. When metal-on-metal contact points are dry, water works its way in and starts the rust cycle. Apply a silicone-based lubricant to:
- Hinges along each panel section - Springs (torsion spring coils and the shaft bearings) - Rollers (on the stem, not the wheel itself if they're nylon) - Cable drums
Skip the tracks. lubricating tracks causes the rollers to slip rather than grip, which is actually a safety issue. A light wipe-down to keep them clean is all the tracks need.
For more details on what safety features to keep in top shape year-round, our post on essential garage door safety features every home needs is worth reading before the wet season hits.
Rain and moisture can affect the safety sensors at the base of your door. the two small units that face each other a few inches off the ground on either side of the opening. These sensors create an invisible beam; if the beam is interrupted while the door is closing, the door reverses. Wet conditions, mud splatter, and condensation can all knock the sensors out of alignment or coat the lenses enough to cause false triggers or outright failure.
Test the sensors by placing a cardboard box in the door's path and pressing the close button. The door should reverse immediately upon contact. If it doesn't, or if the door refuses to close and the sensor light is blinking, clean the lenses with a dry cloth and check that both units are pointed directly at each other. If that doesn't resolve it, call a technician. a sensor that won't detect an obstruction is a genuine safety risk.
Also test the manual disconnect cord (usually a red handle hanging from the opener rail). During a power outage. which can happen during heavy storms. you need to be able to open and close the door manually without a fight. Pull the cord and try operating the door by hand. It should move relatively smoothly and stay in place at any height. If it drops on its own or feels extremely heavy, the springs may need adjustment. If you suspect a spring issue, read up on the signs your garage door springs need replacement before deciding whether to call for service.
Leaves, debris, and soil that pile up against the bottom of the door create a dam that directs water under the seal instead of away from the opening. Before storm season, clear the area on both sides of the door and make sure the concrete apron or driveway in front of the garage slopes away from the opening. In neighborhoods like those near Sweetwater Road or the lower-lying streets closer to the bay, this drainage detail matters more than in higher-elevation parts of the city.
If your garage floor already floods during heavy rains, consider a rubber threshold seal bonded to the concrete floor that the door closes against. these provide a much tighter barrier than a hanging sweep alone.
Garage door openers mounted on or near exterior walls can be affected by humidity and condensation during the wet season. If your opener is making grinding sounds, responding sluggishly, or throwing error codes, moisture may have worked its way into the motor housing or logic board. This is especially true for older units that weren't designed with modern weather sealing.
If you've been thinking about upgrading to a smart opener, the transition to a newer unit with better weather protection is worth considering. Our guide on the complete guide to smart garage door openers breaks down your options clearly.
Garage Door National City is happy to do a pre-season inspection if you'd rather have a professional run through this checklist for you. See our frequently asked questions for more on what a maintenance visit includes, or book a time that works for you before the next storm system rolls through.
Q: My garage door is hard to open manually after a heavy rain. What's going on? A: In most cases, this points to one of three things. swollen wooden panels pressing against the frame, corroded or dry rollers that aren't moving freely in the tracks, or a spring that's lost tension. If the door feels significantly heavier than normal or won't stay up on its own, that's a spring problem and you should call a professional rather than forcing it.
Q: How do I stop water from pooling inside my garage after it rains? A: Start with the bottom seal. replace it if it's cracked or worn. Then check whether the concrete apron in front of the door is sloping toward or away from the opening. If water is coming in despite a good seal, a rubber threshold strip bonded to the floor adds a second layer of protection. For persistent flooding, the drainage around your driveway may need professional attention.
Q: Is it worth getting a garage door inspection before rainy season every year in National City? A: Yes, especially for homes with older doors or hardware that hasn't been serviced in a while. National City's wet season is short but can be intense, and a system that's been sitting through months of dry, salty air is more likely to fail under the added stress of rain and humidity. An annual tune-up is relatively inexpensive compared to an emergency repair call in the middle of a storm.