Decking · Hot & dry
How a cedar deck ages in San Diego, CA
In San Diego, sun does most of the damage. UV here ranks #9 of 25 cities we cover. Untreated boards bleach to a pale silver and open up surface checks; with a decay index of only 12, rot is a slow, secondary risk. Model estimate: 18–24 years untreated, 25–32 years sealed on schedule.
Storyboard
20 years in San Diego, untreated
San Diego’s wear fingerprint
Each bar is scaled to the highest of the 25 cities we cover; the black line marks the median.
NOAA station SAN DIEGO INTL AP (USW00023188, 2.6 km away), 1991–2020 normals · humidity & UV: NASA POWER.
What fails first here
- 1Surface checkingStrong UV (rank #9 of 25) dries and shrinks the surface faster than the core, opening fine cracks.
- 2Sun bleaching & raised grainSurface fibers break down under strong sun and wash away, leaving a pale, fuzzy texture.
- 3GrayingCosmetic, and fast: our model has the surface fully silver by year 2. Not damage on its own, but it means the protective surface is gone.
- 4Mildew & algaeMostly a shady-corner issue here: 40 rainy days a year is moderate, but sun dries boards between storms.
Upkeep
San Diego maintenance calendar
Built from local normals: bar width is the share of days with rain; sealant needs 2–3 dry days between 50 and 88 °F.
Same city, other materials
How the alternatives age in San Diego
Pin-ready
Save it for when you build.
The 20-year storyboard as a tall pin, linking back to this page.
Cedar decks in similar climates
Los Angeles, CA
San Francisco, CA
Charleston, SC
Portland, OR
New York, NY…and in very different ones
New Orleans, LA
Miami, FL
Tampa, FLQuestions San Diego owners ask
How long does a cedar deck last in San Diego?
Our model puts it at 18–24 years untreated and 25–32 years if it is sealed every 2–3 years. The national typical range is 15–20 yrs; San Diego’s sun & uv profile is why the local number differs.
When is the best time to seal a cedar deck in San Diego?
July and August: the months with the fewest rainy days while average temperatures sit between 50 and 88 °F. Most sealants need 2–3 dry days to cure.
Is composite better than cedar in San Diego?
It depends: composite won’t check or bleach, but it fades and gets hot in strong sun. Our model gives composite 24–31 years here versus 18–24 for untreated cedar.
Why does wood turn white or pale in San Diego?
UV breaks down lignin at the surface; rain and wind wash the loose fibers away, leaving a bleached, silvery layer. It is cosmetic until checks open up.
Model simulation, not a guarantee: south-facing, full sun, no shade or ground-contact surprises. How it works.