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Earthworms come out in the rain to regulate their breathing. They breathe through their skin, which requires them to be moist at all times. Too much water can suffocate them, however.
During rainy weather their burrows usually fill up with water, prompting them to find an area that's moist but not drenched.

Why Do Earthworms Surface After Rain? - AccuWeather

www.accuweather.com/en/weather-news/why-do-earthworms-surface-afte/28916

Apr 14, 2013 ... Earthworms often come to the surface to escape moles. "Rain ... "Similar to how earthworms move upwards and out of the way when predator ...

Why Do Earthworms Surface After Rain? - Scientific American

www.scientificamerican.com/article/why-earthworms-surface-after-rain/

Apr 14, 2011 ... Earthworms often come to the surface to escape moles. "Rain ... "Similar to how earthworms move upwards and out of the way when predator ...

Frequently Asked Questions About Earthworms ... What do ...

www.learner.org/jnorth/search/WormNotes3.html

Q. Why do earthworms stay underground and seldom come out of the soil? A. Darkness ... Q. Why do worms come onto driveways and sidewalks when it rains?

Why do earthworms come out after rain? – Kiwi Conservation Club

kcc.org.nz/why-do-earthworms-come-out-after-rain/

Oct 22, 2015 ... It likes damp soil, but if the rain is very heavy, the oxygen in the water-logged soil may run out. Then the worm has to come up into the air to ...

Why Do Worms Surface After Rain? | Mental Floss

mentalfloss.com/article/50786/why-do-worms-surface-after-rain

May 31, 2013 ... ... worms climb out on the pavement, only to die when the rain stops. ... Earthworms breathe by passing oxygen and carbon dioxide through their skin. ... it rained during the day, but had to come up sooner if it rained at night.

Why do earthworms commit suicide? - Quora

www.quora.com/Why-do-earthworms-commit-suicide

There are several theories as to why earthworms surface when it rains: the best time to travel ... Or when the sun all of a sudden breaks through the clouds a worm can dry out quickly and die before it can reach safe soil again. Source: Why ... When there is no soil at all, how do earthworms come in my terrace after raining?

Earthworms Taking Over Driveway | Today's Homeowner

www.todayshomeowner.com/earthworms-taking-over-driveway/

After a rain, or when humidity is high, it's very common to see earthworms making their ... In fact, earthworms do a better job than any farm or garden practice, and the gardener gets to ... I too have worms that come out in full force from the lawn.

www.ask.com/youtube?q=Why Do Earthworms Come Out in the Rain?&v=fF36KDOzSZA
Oct 9, 2014 ... One rainy day I was walking my dog and while we were struggling to avoid the earthworms crawling everywhere, I was wondering: why would ...

Curiosities: After rains, why do worms crawl out onto the pavement ...

news.wisc.edu/curiosities-after-rains-why-do-worms-crawl-out-onto-the-pavement-and-commit-suicide/

Jun 29, 2007 ... Curiosities: After rains, why do worms crawl out onto the pavement and “commit suicide”? ... After a strong rain, the corpses of worms strewn across the ... oxygen when the soil is flooded, so they come to the surface to breathe.