Seattle gets rain nearly 150 days a year, which puts outdoor deck railings to the test. If you’re considering glass railings for your home, it’s fair to wonder how they handle constant moisture and wet conditions.
In this blog, we’ll break down how Seattle’s weather affects glass railings, the pros and cons, and what to consider before installing them in Washington.
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Washington’s Unique Climate
Before choosing any outdoor railing material, you need to understand what weather throws at it. Bellevue has a reputation for rain, and it’s well deserved. Bellevue averages about 37 to 39 inches of rainfall each year. That rain falls across roughly 150 days, making it one of the rainiest cities in America by number of wet days.
But rain isn’t the only challenge. It also has high humidity levels, often reaching 80% to 90% during wet months. The city experiences mild temperatures year-round, with winters rarely dropping below freezing and summers staying comfortable in the 70s. This combination of moisture and mild temperatures creates perfect conditions for mold, mildew, and material decay.
| Weather Factor | Annual Average |
| Total Rainfall | 37-39 inches |
| Rainy Days Per Year | 150 days |
| Average Humidity | 80-90% (wet season) |
| Wettest Month | November (5-6 inches) |
| Driest Month | July (less than 1 inch) |
Why Glass Railings Excel in Rainy Climates
Glass railings handle Bellevue weather better than most other railing materials. Unlike wood that absorbs water and rots, or metal that can rust, glass is completely non-porous. Water simply runs off the surface. It cannot penetrate, soak in, or cause internal damage.
• 100% moisture resistant: Glass doesn’t absorb water, so it won’t warp, rot, or swell
• Mold and mildew proof: Non-porous surfaces don’t support fungal growth like wood does
• No rust or corrosion: Tempered glass won’t degrade from moisture exposure
• Self-cleaning effect: Bellevue’s frequent rain actually helps wash away dirt and debris
• Long lifespan: Glass railings last 20 to 30 years with minimal maintenance
How Glass Stands Up to Bellevue Conditions
Handling Heavy Rain and Drizzle
Seattle’s rain pattern is different from other cities. Instead of brief heavy storms, Bellevue gets long periods of light drizzle and mist. This constant moisture is tough on wood and metal, but glass handles it perfectly. The smooth surface sheds water instantly. No pooling, no absorption, no damage.
Tempered glass panels are designed to withstand outdoor conditions. They won’t crack from temperature changes or weaken from repeated wetting and drying cycles. The glass stays strong and clear year after year, even through Seattle’s rainiest months.
Surviving High Humidity
High humidity causes big problems for traditional railing materials. Wood swells and warps. Metal develops surface rust. Paint peels and cracks. Glass has none of these issues. It remains stable in any humidity level. The structure stays solid, and the appearance stays beautiful.
The only effect humidity has on glass is occasional condensation. Water droplets may form on the surface during foggy mornings. But this wipes away easily and causes no damage to the glass itself.
Dealing with Temperature Swings
Seattle has mild temperatures compared to many cities. Winter lows rarely drop below 35°F, and summer highs stay around 75°F. This is actually ideal for glass railings. Tempered glass can handle much more extreme temperature swings without cracking or weakening.
Even on the rare occasions when Seattle sees freezing temperatures, glass railings perform well. Properly installed systems include small gaps that allow for thermal expansion. This prevents stress on the glass panels during temperature changes.
Choosing Weather-Resistant Hardware for Seattle
While glass itself handles moisture perfectly, the hardware holding it matters too. Seattle’s wet climate demands corrosion-resistant materials for posts, clamps, and fittings. Cutting corners on hardware will lead to problems down the road.
• Stainless steel (316 grade): Best choice for Seattle’s moisture – resists rust and corrosion
• Powder-coated aluminum: Excellent weather resistance at a lower price point
• 2205 duplex stainless: Premium option for waterfront Seattle properties
• Avoid: Standard 304 stainless or untreated metal in high-moisture areas
Quality hardware includes drainage features that prevent water from pooling around the base of glass panels. This keeps the mounting system dry and extends its lifespan in Seattle’s wet climate.
Glass vs. Other Railing Materials in Seattle Weather
Here’s how glass compares:
Wood railings require constant maintenance in Seattle. Cedar is popular but needs sealing every one to two years. Without regular treatment, wood absorbs moisture, grows mold, and eventually rots. Many Seattle deck owners spend weekends sanding and staining.
Aluminum railings hold up well to Seattle rain when powder-coated. They’re a solid mid-range choice. However, they block views more than glass and can look industrial on residential properties.
Cable railings offer good views but require tension adjustments. The cables can show water spots and need regular cleaning to look their best. Stainless steel cables handle moisture well.
Glass railings require the least maintenance for Seattle conditions. They offer unobstructed views, resist all moisture damage, and actually get cleaned by the rain. The higher upfront cost pays off through years of low maintenance.
Maintenance Tips for Seattle Glass Railings
Glass railings need very little maintenance in Seattle. The frequent rain does much of the cleaning work for you. But a few simple steps keep your railings looking their best:
• Clean seasonally: Wipe down glass panels two to four times per year with mild soap and water
• Use vinegar solution: Mix 50/50 white vinegar and water for stubborn water spots
• Check hardware annually: Inspect posts and fittings for any signs of corrosion
• Clear debris: Remove leaves and dirt from the base of panels before they cause staining
• Avoid harsh chemicals: Skip abrasive cleaners that could scratch the glass surface
Cost Considerations for Seattle Homeowners
Glass railings cost more upfront than wood or basic aluminum options. Seattle homeowners typically pay $150 to $600 per linear foot installed for glass railing systems. Frameless designs fall on the higher end, while framed systems cost less.
However, the long-term value makes sense for Seattle’s climate. Wood railings need resealing every one to two years, costing $200 to $500 annually in materials and time. Over 20 years, glass railings often cost less total when you factor in maintenance savings.
• Framed glass systems: $150 to $350 per linear foot
• Frameless glass systems: $200 to $600 per linear foot
• Average deck project (40 ft): $8,000 to $20,000 total installed
• Lifespan: 20 to 30 years with proper hardware
Is Glass Railing Right for Your Seattle Home?
Glass railings and Seattle weather make a great match. The same rain that damages wood and rusts metal simply runs off glass surfaces. You get clear views of Seattle’s beautiful landscapes without worrying about moisture damage or constant maintenance.
The key is choosing quality components. Invest in tempered or laminated glass panels and corrosion-resistant hardware.
Work with installers who understand Seattle’s building codes and climate challenges. A properly installed glass railing system will serve your home beautifully for decades.
Choose Glass Railing Seattle for your glass railing system, contact us today.