If you’ve lived in the San Fernando Valley for more than a week, you know the Granada Hills weather forecast is basically its own personality. It’s not just "Los Angeles weather." It’s a specific, sometimes moody microclimate tucked right against the Santa Susana Mountains.
Honestly, it’s a bit of a local joke. You’ll be wearing a t-shirt at the Northridge Fashion Center, but the second you drive north past the 118, you’re looking for a windbreaker.
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The Current Situation: A Warm January Surprise
Right now, as we sit in mid-January 2026, things are looking pretty unusual. Today, Saturday, January 17, we are looking at a high of 80°F. Yeah, you read that right. Eighty degrees in the dead of winter. It’s currently 53°F and cloudy, but that thermometer is going to climb fast.
The wind is coming out of the north at about 7 mph, though we’ve seen gusts much higher than that earlier this morning. Humidity is sitting at a bone-dry 38%. It feels like spring, or maybe a very polite summer, but definitely not what most people expect from January.
The clouds are hanging around, making it "mostly cloudy" for the bulk of the day. If you’re planning on being outdoors, don’t let the clouds fool you; the UV index is still hitting a 2. Not high, but enough to catch a bit of color if you’re out for hours.
Why Granada Hills Feels Different
The geography here is the real culprit. Being at the northern edge of the Valley means we get the first "hello" from the winds coming over the Newhall Pass.
- Elevation Matters: Granada Hills sits higher than much of the basin.
- The Mountain Effect: Those hills act like a giant funnel for air.
- The 118 Divide: There is a literal temperature shift sometimes when you cross the freeway.
Tomorrow, Sunday, January 18, the warmth sticks around with a high of 77°F. It’ll be mostly sunny, so it’s basically the perfect day for a hike at O'Melveny Park—just bring water because the humidity is expected to drop even lower to around 20%.
Looking at the Week Ahead
If you’re trying to plan your week, the Granada Hills weather forecast stays pretty consistent through Tuesday. We are looking at a string of 77°F days. Monday and Tuesday will be pure sun.
Then, things start to shift.
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By Wednesday, January 21, the highs dip slightly to 76°F as some "partly sunny" conditions move in. Thursday brings more clouds and a high of 72°F.
The real change hits next weekend. We’re actually looking at a chance of rain. On Friday, January 23, the high drops to 67°F, and by the evening, there’s a 25% chance of light rain. Saturday and Sunday (Jan 24-25) currently show a 40% chance of rain with highs in the upper 60s.
The Wind Nobody Talks About (Until It Hits)
We can't talk about weather here without mentioning the winds. While the current north wind is a mild 10 mph, Granada Hills is famous for those Santa Anas. Experts like those at the National Weather Service in Oxnard often point out that the Santa Susana Mountains create a "Venturi effect." Basically, the wind gets squeezed through the mountain passes and speeds up.
When the forecast says 10 mph for Los Angeles, it often means 25 mph for us.
It’s the reason why everyone in the 91344 zip code has a story about their patio furniture ending up in a neighbor's pool.
Practical Steps for the Next 48 Hours
Since we are dealing with a dry, warm spell followed by a potential rain shift, here is what you actually need to do:
- Hydrate your plants now: With humidity dropping to 19-20% this weekend, your garden is going to feel the thirst before the rain arrives next week.
- Check your wipers: We haven't had a real rain in a bit, and with a 40% chance next Saturday, you don't want to find out your blades are dry-rotted when you're on the 405.
- Dress in layers: A 28-degree swing between the high of 80°F and the low of 52°F is no joke.
- Watch the North Wind: If you have loose umbrellas or light plastic bins outside, secure them today while the wind is only at 10 mph.
Keep an eye on the Friday night forecast as that 25% rain chance develops. It’s the first real sign of winter returning to the Valley after this weirdly warm week.