You’re waking up in Glendora, looking at the foothills, and trying to decide if you actually need that light jacket. Honestly, the glendora ca weather forecast is a bit of a local riddle. Because we sit right against the San Gabriel Mountains, what the "big" weather apps say for Los Angeles almost never applies to us.
Right now, it's Saturday, January 17, 2026. If you're checking the window, it's currently a crisp 55°F outside. It's nighttime and cloudy, which is typical for this time of year when the marine layer or mountain clouds decide to settle in.
There's a light breeze coming from the east at about 6 mph. Humidity is sitting at 35%, which is pretty dry, even for January. You’ve probably noticed that "static shock" feeling when you touch your car door—that’s the low humidity at work.
Today's Outlook: Highs, Lows, and That 10% Chance
If you’re planning a hike up to the Glendora Bougainvillea or just running errands at the Village, here is the breakdown for the rest of today:
- High Temperature: 77°F. That’s a massive jump from the morning low.
- Low Temperature: 55°F.
- Sky Conditions: Partly sunny during the day, turning cloudy as we head back into tonight.
- Precipitation: There is a 10% chance of rain. Basically, don't cancel your BBQ, but don't be shocked if you feel a stray drop or two.
The wind is staying mellow, shifting slightly to the northeast at 5 mph. The UV index is a 2, which is low, but if you’re fair-skinned and spending the whole afternoon outside, it's still worth a bit of sunscreen.
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Why Glendora Feels Different
Geography is everything here. We live in a microclimate. While the coast might be shivering under a thick "June Gloom" (even in January sometimes), Glendora often bakes because the mountains trap heat. Conversely, in the winter, the cold air sinks down the canyons. This is why you’ll see a 20-degree difference between us and Pasadena on some days.
Historically, January in Glendora is "moderately chilly" with average highs around 65°F. Today’s 77°F is actually quite a bit warmer than the historical average. We’re seeing more of these "faux-spring" days lately.
What You Should Actually Do
If you're heading out, dress in layers. That 55°F to 77°F swing is no joke. You’ll be freezing at 7:00 AM and sweating by noon.
Also, keep an eye on the air quality. While it's currently decent, the topography of the San Gabriel Valley means smog and particulates can get trapped against the mountains. On days with low wind like today (5-6 mph), that air doesn't move much.
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Pro-tip for locals: If you see the clouds "sitting" on the mountains, that 10% rain chance usually stays up in the canyons. If the clouds start moving south toward Route 66, grab your umbrella.
The best way to stay ahead of the glendora ca weather forecast is to check the specific foothill sensors rather than just "LA County" averages.
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Check the specific humidity levels if you're doing any gardening today; with 32-35% humidity, your plants are going to get thirsty faster than usual for a winter day.