You think you know Southern California weather. Sun, palm trees, maybe a light breeze. But if you’re looking at weather San Bernardino CA 92410 USA, you’re dealing with a weird, beautiful, and sometimes frustrating microclimate that doesn't play by the coastal rules of Los Angeles or the pure desert vibes of Palm Springs.
San Bernardino is essentially a giant bowl at the base of the mountains. This geography dictates everything from why your sinuses might be screaming to why you need a parka at 6:00 AM and a tank top by noon.
The Inland Empire’s "Temperature Rollercoaster"
Right now, in mid-January 2026, the 92410 area is sitting in a classic winter pattern. We’re seeing daytime highs hitting a surprising 78°F, while the nights plummet into the low 50s. That’s a nearly 30-degree swing. Honestly, if you aren't dressing like an onion—layers on layers—you’re doing it wrong.
The 92410 zip code, which covers a good chunk of central San Bernardino near the 215 and the Carousel Mall area, feels the "Santa Ana" influence more than almost anywhere else. When those winds kick up, the humidity drops to single digits. Your skin will feel like parchment paper.
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Why weather San Bernardino CA 92410 USA is unique
Most people assume California winters are rainy. Well, sort of. In San Bernardino, February is historically the wettest month, averaging about 2.36 inches of rain. But don't expect a steady drizzle. When it rains here, it’s usually an atmospheric river event—huge, concentrated dumps of water that turn the local washes into raging rivers.
- The Heat Trap: In the summer (July-August), the 92410 area regularly sees days over 100°F. Because of the "basin" effect, the heat just sits there.
- Air Quality Realities: We have to be honest here. The air quality in 92410 can be tough. According to 2025 and 2026 data from AirNow and the EPA, San Bernardino County often struggles with "Moderate" to "Unhealthy" AQI levels, especially during summer heatwaves or when those Santa Ana winds blow dust and pollutants across the valley.
- The Mountain Shadow: You’re staring right at the San Bernardino Mountains. This creates a "rain shadow" effect, but it also means cold air drains off the peaks and settles in the city at night.
Seasonal Breakdown: What to actually expect
Winter (December - February)
This is actually the "green" season. If we get enough rain, the hills behind the city turn a vibrant, Irish green. It’s stunning. Daytime highs usually hover around 67°F, but don't let that fool you. The wind-chill from the Cajon Pass can make it feel much colder. If you're visiting the National Orange Show Event Center in January, bring a heavy jacket for the evening.
Spring (March - May)
Spring is the "sweet spot." Temperatures are usually in the 70s. However, this is also when the "May Gray" starts to creep in. Unlike the coast, where the marine layer is thick and foggy, in 92410, it usually manifests as a high haze that burns off by 11:00 AM.
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Summer (June - September)
It's hot. There’s no other way to put it. August is the peak, with average highs of 96°F, but the 92410 area frequently breaks 105°F. The "dry heat" is real, though. It’s not like Florida; you won't feel like you're breathing through a wet towel. But you will need to check your tire pressure, as the road surface temperatures on the 215 freeway can exceed 140°F.
Fall (October - November)
Fall is the most unpredictable. You can have a 95-degree day on Halloween or a windstorm that knocks out power lines. The Santa Ana winds usually peak in late October. These are north-easterly winds that are hot, dry, and fast. They are the primary reason for the high wildfire risk in the surrounding foothills.
Surprising Facts About San Bernardino’s Climate
One thing that confuses newcomers is the "Inversion Layer." Basically, a layer of warm air traps cooler air (and smog) near the ground. You might see a clear, blue sky up at Lake Arrowhead while the city of San Bernardino is covered in a grayish haze.
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Another weird detail? Snow. While it almost never snows in the 92410 zip code (the last significant event was decades ago), you are only 30 minutes away from world-class skiing. You can literally be wearing shorts at a San Bernardino 66ers baseball game while looking at snow-capped peaks.
Actionable Advice for Navigating 92410 Weather
If you’re living in or visiting San Bernardino, you need a different strategy than you’d use for the rest of SoCal.
- Monitor the AQI: Use the AirNow app. If the index is over 100, skip the afternoon jog. The 92410 area is a collection point for ozone.
- Hydrate for the Winds: When the Santa Anas blow, you lose moisture through your skin and breath incredibly fast. Drink double the water you think you need.
- Park in the Shade: This sounds obvious, but a black car interior in a San Bernardino parking lot can reach 170°F in under 20 minutes.
- Check the Cajon Pass: If you’re traveling north on the 15, the weather in San Bernardino is not the weather in the pass. High winds often shut down trucks and high-profile vehicles even when it’s calm in the city.
The weather San Bernardino CA 92410 USA is a study in extremes. It’s a place where you can experience three seasons in a single Tuesday. Respect the sun, prepare for the wind, and always, always keep a hoodie in your trunk—even in July.
Next Steps for Your Trip or Move:
Check the current wind speeds if you're planning to drive through the Cajon Pass today, as gusts over 40 mph are common during this time of year. If you're sensitive to air quality, plan your outdoor activities for before 10:00 AM when ozone levels are typically at their lowest.