Weather News

How much did it rain overnight in SLO County — and when will it stop?

You know what they say: April showers bring May flowers.

A consistent overnight sprinkling brought an average of half an inch of rain to San Luis Obispo County in the last 12 hours, with some areas recieving more than others, according to the National Weather Service rainfall totals.

The coastal region of the county mostly saw slightly above average rainfall. San Luis Obispo and Morro Bay got 0.56 and 0.62 inches of rain, respectively, since Monday while Oceano and Nipomo both got above 0.8 inches in the same timeframe, according to the weather service. Moving further up the coast, San Simeon had 0.7 inches.

Raindrops splash puddle on Chorro Street as a late season storm soaked San Luis Obispo County on April 21, 2026.
Raindrops splash puddle on Chorro Street as a late season storm soaked San Luis Obispo County on April 21, 2026. David Middlecamp dmiddlecamp@thetribunenews.com

Rocky Butte got the most rainfall with 1.3 inches in the last 12 hours, and Lopez Lake had the second most with 1.08 inches.

Moving further north and east, the rain tapered off, leaving Shandon with 0.16 inches, Paso Robles with 0.36 inches and Atascadero with a mere 0.01 inch.

Traffic is reflected in a puddle over a backed up drain at the corner of Marsh and Carmel Streets in San Luis Obispo. A late season storm soaked San Luis Obispo County on April 21, 2026.
Traffic is reflected in a puddle over a backed up drain at the corner of Marsh and Carmel Streets in San Luis Obispo. A late season storm soaked San Luis Obispo County on April 21, 2026. David Middlecamp dmiddlecamp@thetribunenews.com

But the rain isn’t over quite yet. Showers were expected to continue Tuesday into the evening, with a 50% chance of rain before 11 p.m., the National Weather Service forecast predicted.

Rainfall amounts were expected to be light — between a tenth and a quarter of an inch — but a potentail thunderstorm on Tuesday afternoon could increase those amounts, the weather service forecast said.

Temperatures were projected to stay in the low 60s during the day and drop to 49 degrees at night with 10 to 15 mph winds and gusts up to 20 mph, the weather service said.

Sunny skies were expected to return by Wednesday.

Gutters were flowing in San Luis Obispo. A late season storm soaked San Luis Obispo County on April 21, 2026.
Gutters were flowing in San Luis Obispo. A late season storm soaked San Luis Obispo County on April 21, 2026. David Middlecamp dmiddlecamp@thetribunenews.com
Rain drips from a cable at the Marsh St. parking garage. A late season storm soaked San Luis Obispo County on April 21, 2026.
Rain drips from a cable at the Marsh St. parking garage. A late season storm soaked San Luis Obispo County on April 21, 2026. David Middlecamp dmiddlecamp@thetribunenews.com
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Chloe Shrager
The Tribune
Chloe Shrager is the courts and crimes reporter for The Tribune. She grew up in Palo Alto, California, and graduated from Stanford with a B.A. in Political Science. When not writing, she enjoys surfing, backpacking, skiing and hanging out with her cat, Billy Goat.
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