The Bay Area has spent the last several years lurching between extremes. Three straight years of drought to a historic run of rains with nine storms in three weeks. The pattern has kept swinging, with weak La Niña conditions. For homeowners, that whiplash can increase termite activity.

What Termites Actually Need

Termites are attracted to moisture around the foundation, in the soil, and inside wood. That single fact explains why both extremes, not just wet years, can raise termite risk.

How Drought Raises Risk

• Dry soil drives termites toward homes in search of moisture.
• Colonies build longer mud tubes to stay hydrated.
• Dry weather can create a false sense of security for homeowners.
• Even small leaks become major termite attractants.

How Wet Weather Raises Risk

• Warm weather after heavy rain triggers termite swarms.
• Damp soil and poor drainage keep foundations vulnerable.
• Rain damage and leaks create ideal conditions for wood infestation.
• Wet years after drought often lead to larger termite swarms.

Also Read: What Bay Area Homeowners Still Get Wrong About Termite Control

Weather Pattern and Termite Risk Signals

Weather Condition	What It Does to Termite Behavior	What to Watch For
Drought/Dry Winter	Termites concentrate around remaining moisture sources near the foundation and travel through more extensive mud tubes	Leaky spigots, AC condensation lines, over-watered planters, shaded damp corners
Heavy Rain / Atmospheric Rivers	Saturated soil plus a warm spell triggers large subterranean swarms; storm damage adds excess wood moisture	Standing water near the foundation, roof leaks, new water stains in the attic or crawl space
Dry Year Followed by Wet Year	Colonies that held back reproduction during drought often release a larger, delayed swarm once conditions turn wet	Unusually large swarms in spring after a wet winter that followed a dry spell
Mild, Wet Winter/Dry Summer (Typical Bay Area Pattern)	Keeps subterranean termites active nearly year-round with no true dormant season	Ongoing low-level activity even outside peak spring swarm season

What Homeowners Can Do

• Keep soil around your foundation properly maintained year-round.
• Repair leaks, sprinkler issues, and clogged gutters promptly.
• Inspect crawl spaces, attics, and foundations after major storms.
• Schedule annual termite inspections to catch problems early.

The Bottom Line

Bay Area weather will likely keep swinging between dry and wet years for the foreseeable future, and termites are built to take advantage of both. If it has been a while since your last inspection, or if your property saw storm damage this past winter, now is a good time to have a professional take a look at your property.

Frequently Asked Questions

1. Does heavy rain increase termite activity in the Bay Area?

Yes. Heavy rain can saturate the soil, increase moisture around foundations, and contribute to leaks and damp wood. When warmer weather follows the rain, conditions can also trigger subterranean termite swarms.

2. Can drought conditions cause more termite problems?

Yes. During dry periods, termites may concentrate around the remaining moisture sources near homes. Leaky spigots, AC condensation, over-watered landscaping, and damp shaded areas can become particularly attractive.

3. Why do termites swarm after rain?

Warm conditions following heavy rain can create favorable conditions for termite swarming. Bay Area homeowners should pay particular attention to unusually large spring swarms following a wet winter.

4. Are termites active year-round in the Bay Area?

Termite activity may continue outside the main spring swarming period. The Bay Area's mild, wet winters and dry summers can support ongoing low-level subterranean termite activity.

5. What should I check for termites after a major storm?

Check for standing water around the foundation, roof or plumbing leaks, water stains, and excess moisture in crawl spaces and attics. Correcting these moisture problems can make the property less attractive to termites.

6. Where can I schedule a termite inspection in the Bay Area?

If your home has experienced heavy rain, storm damage, leaks, or prolonged dry conditions, consider scheduling a professional termite inspection in the Bay Area. An inspection can check foundations, crawl spaces, attics, and other moisture-prone areas for signs of termite activity.