If you’re standing on the Mare Island waterfront today, January 16, 2026, you're probably noticing that the air feels a lot more like a mild spring afternoon than the middle of winter. Honestly, Vallejo has this weird, lovely way of defying expectations. While the rest of the country is often digging out of snowdrifts this time of year, we’re looking at a sunny day with a high of 64°F.
It’s pretty classic Solano County.
The vallejo weather 10 day forecast is currently leaning into this "false spring" vibe, but if you’ve lived here long enough, you know the North Bay doesn't stay predictable for long. We’ve got clear skies tonight and a low of 41°F, so don’t ditch the heavy coat just because you wore a t-shirt at lunch. The humidity is sitting at 65%, and we have a light breeze coming from the east at 7 mph.
Basically, it's perfect walking weather, provided you have layers.
The Breakdown: What’s Actually Happening Over the Next Week
Looking ahead, the ridge of high pressure that’s giving us this beautiful sun is going to hang out for a bit, but there’s a shift coming. Tomorrow, Saturday, January 17, we’ll see some "increasing cloudiness," with highs dropping slightly to 64°F and lows around 41°F. It’s the start of a cooling trend that’s going to make the mornings feel a lot more "January."
Sunday and Monday keep that pattern. We’re talking highs of 63°F and 64°F respectively. By Tuesday, January 20, things get a bit moodier. Expect mostly cloudy skies and a dip to 61°F.
The real conversation starts mid-week.
While the first half of this 10-day stretch is bone dry, the long-range models are hinting at some "sprinkles" and overcast conditions by January 26 and 27. It’s not a washout—not yet—but the chance of precipitation jumps to around 64% for that following Monday. It’s that typical Bay Area cycle where we get teased with 65-degree sun before the marine layer and the Pacific systems remember we’re still in the wet season.
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Why Vallejo Weather is a Total Gamble
Kinda funny how a five-mile drive can change your temperature by ten degrees around here.
That’s the microclimate effect. Vallejo sits in this sweet spot where the Carquinez Strait acts like a giant atmospheric straw. It sucks in cool air from the San Pablo Bay, which is why we’re often ten degrees cooler than Vacaville but five degrees warmer than San Francisco.
If you're checking the vallejo weather 10 day forecast to plan a trip to Six Flags or a ferry ride, you have to account for the wind. Even on a sunny 64-degree day, that wind off the water can make it feel like 55. Historically, January in Vallejo averages a high of 58°F, so we are currently running about six degrees above the norm. It’s nice, but it’s also a reminder of how much our "normal" is shifting.
Surviving the January Swing
You’ve probably seen the tourists shivering in shorts near the ferry terminal. Don't be that person.
The uv index is low—around 2—but the air is crisp. Since the humidity stays relatively high (averaging 72% to 81% this month), the cold "bites" more than a dry cold would. It’s a damp chill that gets into your bones once the sun goes down at 5:12 PM.
- Morning Prep: If you’re heading out before 8:00 AM, it’s going to be near 40°F.
- The Midday Pivot: By 2:00 PM, you’ll want to be in a light sweater.
- The Rain Check: Keep the umbrella near the door starting January 25. The transition from "broken clouds" to "overcast sprinkles" happens fast.
The data shows we’ve already had a fairly wet January so far, with over 90mm of rain recorded in the first two weeks. This current dry spell is a gift. Take advantage of the 7 mph winds and the clear visibility while it lasts, because the 10-day outlook suggests the dampness is circling back for a late-month visit.
Honestly, just enjoy the sun while the east wind is behaving.
Actionable Forecast Steps
Check your tire pressure this week; the swing from 64-degree days to 41-degree nights causes that "low pressure" light to pop on like clockwork. If you’re gardening, it’s a great window to prune while the ground is relatively dry, but hold off on any new planting until we see if that January 26 rain materializes into a real storm. Keep an eye on the ferry schedules if the wind gusts pick up past 15 mph later next week, as the crossing can get choppy when the tides and the wind disagree.