San Diego Weather Forecast: Warmth Followed by Cool Storm in April 2026

Why this matters: Residents should prepare for changing weather conditions, including potential rain and cooler temperatures, particularly over the weekend. Those planning to view the Artemis II splashdown should be aware of possible cloud cover.

San Diego's weather forecast indicates a transition from unseasonably warm conditions to a cooler, wetter pattern. The early part of the week will see temperatures above average, with coastal areas near 70°F and inland areas reaching into the 80s. Deserts could experience even hotter conditions. As the week progresses, a Pacific storm will bring cooler air and the possibility of rain.

The storm is expected to arrive late Friday, bringing widespread rain on Saturday and lingering showers into Sunday. While the exact rainfall amounts are still uncertain, current forecasts suggest most of the county could receive between 0.50 and 1.50 inches of rain. This could impact outdoor activities and travel plans.

The Artemis II splashdown, a significant event for the region, is scheduled to occur amidst these changing conditions. While the event itself is expected to be dry, cloud cover may be present, and rain is likely to follow later that evening.

Preliminary forecasts estimate between 0.50 to 1.50 inches for most of San Diego County.

The splashdown is expected to be dry, but cloud cover is likely, and rain will arrive later that night.

The cooling trend begins on Thursday, with the coolest day expected to be Sunday.

How do you think this shift in weather will impact your weekend plans? Share your thoughts in the comments below!

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