Honestly, looking at the sky in Southern California can be a bit of a guessing game during the winter. One minute you're thinking about hitting the beach, and the next you're hunting for that one heavy hoodie you own. If you’re trying to plan your Monday, January 19, 2026, the weather tomorrow Chula Vista is shaping up to be one of those classic transition days.
It’s basically going to be a "layer up" kind of day. We're looking at a high of 72°F and a low of 47°F. That 25-degree swing is enough to make anyone a bit indecisive about their outfit.
What’s Actually Happening with Weather Tomorrow Chula Vista
Morning commuters are probably going to see some "partly sunny" skies. Don't let the word "sunny" fool you into thinking it's t-shirt weather at 7:00 AM. With a low hitting 47°F overnight, that morning air is going to feel crisp, maybe even a little sharp if you’re near the coast.
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The humidity is hovering right around 50%, which is pretty comfortable—not too dry, not too muggy. Just standard Chula Vista vibes.
Breaking Down the Numbers
- High Temperature: 72°F
- Low Temperature: 47°F
- Conditions: Partly sunny during the day, clearing up to a clear night.
- Precipitation: Only a 5% chance of rain during the day (basically zero).
- Wind: A gentle 5 mph breeze coming from the West.
- UV Index: 3 (Moderate—you still need some SPF if you're outside for a long stretch).
The wind is barely a factor tomorrow. At 5 mph from the west, you'll feel a slight coastal influence, but nothing that's going to blow your hat off or make the "feels like" temperature plummet. It’s a stable, calm atmosphere.
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Why the UV Index Matters Tomorrow
Even though it’s January, a UV index of 3 means the sun still has some bite. It’s easy to forget that when the air is cool. If you're heading to Otay Lakes or taking a walk around Bayside Park, that "partly sunny" sky means the sun will be peeking through enough to give you some exposure. Experts at the National Weather Service often remind us that even moderate UV levels can cause skin damage over time, especially for those with sensitive skin.
Kinda weird to think about sunscreen in the middle of winter, but that’s San Diego County for you.
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Nighttime Vibes in the South Bay
Once the sun dips, things change fast. The sky is expected to be clear, which sounds lovely for stargazing but also means all that daytime heat is going to escape right back into the atmosphere. By the time you're heading home from dinner, it'll be dropping toward that 47°F mark.
If you're out late, the lack of cloud cover means no "blanket" to keep the warmth in. You'll definitely want a jacket.
Actionable Tips for Tomorrow
- Dress in Layers: Start with a light base and bring a medium-weight jacket. You’ll be shedding it by noon and reaching for it again by 5:00 PM.
- Hydrate: 50% humidity is middle-of-the-road, but the dry Santa Ana patterns we sometimes see this time of year can sneak up on you. Keep the water bottle handy.
- Check the Car: If you're parked outside, that 47-degree low might mean a tiny bit of dew on the windshield, though with 50% humidity, it likely won't be much.
Plan for a beautiful, albeit slightly chilly morning, followed by a gorgeous afternoon that’s perfect for being outdoors. The weather tomorrow Chula Vista is looking like a solid 8/10 for productivity and comfort.
To make the most of the day, aim to do your outdoor exercise between 11:00 AM and 3:00 PM when the temperature hits that sweet spot in the high 60s and low 70s. Keep an eye on the western horizon around sunset—clear nights after partly sunny days often produce some of the best colors over the Pacific.