If you’ve spent any real time in the northwest corner of the San Fernando Valley, you know the vibe. One minute you're admiring the rugged sandstone of the Santa Susana Pass, and the next, a gust of wind nearly takes your hat off. Honestly, the weather in Chatsworth CA 91311 is its own beast. It doesn't play by the same rules as Santa Monica or even downtown Los Angeles.
People think "Southern California" and imagine a constant 75-degree breeze. Chatsworth says, "Hold my water bottle."
Right now, as of Saturday, January 17, 2026, we’re looking at a temperature of 67°F. It feels a bit warmer—around 72°F—partly because that humidity is sitting at a crisp 24%. It's mostly cloudy today, which is actually a nice break from the relentless sun we usually get. But here’s the kicker: the wind. We’ve got northeast winds hitting 19 mph. If you’re planning on hiking Stoney Point today, you’re going to feel that resistance.
The Valley Heat vs. The Chatsworth Wind
Most folks living in the 91311 zip code know that summer is a marathon. In August, the average high hits about 89°F, but it's not rare to see it spike way past 100°F. Because Chatsworth is tucked right against the mountains, it traps heat. But it also acts as a funnel for the Santa Ana winds.
These aren't just "breezes."
During a Santa Ana event, high pressure in the Great Basin pushes air toward the coast. As that air drops down the mountains into Chatsworth, it compresses and heats up. It gets bone-dry. We’re talking humidity levels dropping below 10%. That’s why you’ll see the wind speed today—19 mph—and think it’s just a "blustery day." But for a local, that’s a signal to keep an eye on the brush.
Weather Chatsworth CA 91311: A 10-Day Reality Check
If you're looking at the week ahead, it's a classic California winter mix. Tomorrow, Sunday, January 18, should be mostly sunny with a high of 74°F. The wind sticks around at 15 mph.
By Monday and Tuesday, the sky clears out completely. Highs will hover around 75°F and 73°F. It’s that weird time of year where you need a hoodie at 7:00 AM (lows are hitting 50°F to 51°F) but you're stripping down to a t-shirt by lunchtime.
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- Wednesday, Jan 21: Clouds return, high of 70°F.
- Thursday, Jan 22: A bit cooler at 66°F.
- Saturday, Jan 24: This is the one to watch. There’s a 40% chance of light rain.
Usually, Chatsworth only gets about 14 to 15 inches of rain a year. Most of that happens between December and March. When it does rain here, it tends to come in quick, heavy bursts that make the 118 freeway a total mess.
Why 91311 Feels Different
The elevation plays a huge role. You’re higher up than the rest of the Valley. That means on clear winter nights, the heat escapes into the atmosphere faster. You’ll wake up to 48°F while someone in Van Nuys is at 53°F. It’s a microclimate thing.
Also, the "feels like" factor is huge here. Today the "feels like" is 72°F despite the 67°F reading. Why? Solar radiation hitting the rocks. Those massive boulders at the edge of town act like giant radiators. They soak up the sun and bleed heat back out.
What You Should Actually Do
If you’re living here or just visiting for the weekend, don't trust the "average" Southern California forecast you see on the national news.
- Hydrate more than you think. That 24% humidity today will dry you out faster than a desert trek.
- Secure the patio furniture. Those 19 mph northeast winds are just the start; gusts in this corridor can hit 30+ mph without much warning.
- Layer up for the weekend. Sunday is going to be gorgeous and sunny, but that 51°F low at night is enough to make you regret leaving the house without a jacket.
- Prep for Saturday's rain. It’s only a 40% chance, but in a dry area like 91311, even a little oil-slicked rain on the roads makes things greasy.
Basically, respect the wind and embrace the clouds while they last. Chatsworth weather is predictable only in its intensity. Enjoy the 74°F "winter" tomorrow—it’s exactly why we pay the California premium.