So you’re heading to the Land of the Mouse, or maybe just catching an Angels game, and you’re staring at that Anaheim weather 20 day forecast wondering if you should pack a swimsuit or a parka. Honestly, Southern California weather is a bit of a trickster in late January. People think it’s all palm trees and tank tops year-round, but if you’ve spent any real time in Orange County during the winter "rainy season," you know that’s not quite the whole story.
Right now, as we sit in mid-January 2026, Anaheim is actually showing off some of its classic temperature swings. One day you’re hitting $82^\circ\text{F}$ and the next you’re reaching for a hoodie because the sun decided to hide behind a thick layer of marine layer clouds.
The Reality of the Next Two Weeks
Looking at the current outlook, we’re seeing a shift from this unseasonably warm spell into something a bit more... well, damp.
Today, Sunday, January 18, started off pretty spectacular with a high of $82^\circ\text{F}$. It felt like a preview of summer. But if you’re planning a trip for the end of the month, don't get used to it. The trend for the next ten days shows a slow slide back down into the high 60s and low 70s. For instance, by Friday, January 23, we’re looking at a much more modest $68^\circ\text{F}$.
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Basically, the "20-day window" is splitting into two distinct vibes:
- Phase 1 (The Warm Front): Now through Jan 21. Highs in the $73^\circ\text{F}$ to $80^\circ\text{F}$ range. Mostly sunny.
- Phase 2 (The Cooling Trend): Jan 22 through the end of the month. Expect more "mostly cloudy" days and highs struggling to break $70^\circ\text{F}$.
Rain is the Wildcard
Is it going to rain? That’s the million-dollar question for anyone with Disneyland tickets.
Statistically, February is actually the wettest month in Anaheim, averaging about 3.1 inches of rain. But the transition starts now. While the chance of rain today is a measly 10%, that number starts creeping up toward the end of January. Specifically, around January 29 and 30, we’re seeing "passing showers" and "scattered clouds" with precipitation chances jumping up to 52%.
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It’s rarely a total washout in SoCal, though. Usually, it’s a quick burst in the morning that clears up by 2:00 PM, leaving the air smelling like wet pavement and eucalyptus.
Why the Forecast Changes So Fast
Anaheim sits in a geographic sweet spot, but it’s heavily influenced by the Pacific Ocean. When the "Santa Ana" winds blow from the desert (like they have been recently), it gets hot and dry. When those winds die down, the marine layer—that thick, gray fog—rolls in from the coast. This is why your Anaheim weather 20 day forecast might look sunny on Monday and then suddenly show clouds by Wednesday. The atmosphere here is basically a tug-of-war between the desert and the sea.
What to Actually Pack
If you’re coming for the latter half of this 20-day stretch, you’ve gotta layer.
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Mornings in late January and early February are crisp. We’re talking lows near $46^\circ\text{F}$ to $50^\circ\text{F}$. If you head to the parks at 8:00 AM in a t-shirt, you’re going to be miserable. But by noon, that $68^\circ\text{F}$ or $70^\circ\text{F}$ temperature feels significantly warmer under the direct California sun.
- The Hoodie is King: Everyone wears them here for a reason.
- Light Rain Shell: Especially for those late January dates (Jan 29-30) when the chance of sprinkles is real.
- Sunscreen: Even if it’s $66^\circ\text{F}$, the UV index stays around a 3 (Moderate). You can still get a "winter burn" if you’re standing in line for three hours.
Strategic Planning for the Weather
If you have flexibility, aim for the mid-week gaps. January 26 and 27 are looking like "partly sunny" days with highs around $71^\circ\text{F}$ to $75^\circ\text{F}$. That is peak walking weather. It’s not too hot to melt, and it’s not cold enough to need a heavy coat.
Keep an eye on the wind, too. While it's currently calm (around 1–5 mph), any jump in wind speed from the North or East can indicate those Santa Ana conditions, which bring the heat but also the fire risk and dry skin. For now, the winds are staying low, mostly coming from the Southwest, which keeps the air feeling fresh and slightly humid (around 40-60%).
Actionable Next Steps
Check the specific hourly forecast 24 hours before you head out. Because the Anaheim weather 20 day forecast is subject to the whims of the Pacific, the 10-day mark is usually where the "guessing" ends and the "predicting" begins.
If the forecast holds for the end of January, grab a poncho from a dollar store before you get to the theme parks. They’ll charge you $15 for the same piece of plastic inside the gates. Also, check the sunset times; the sun is dipping behind the horizon around 5:15 PM these days. Once that sun goes down, the temperature drops fast—usually about 10 degrees in a single hour. Plan your indoor dining or show times for that sunset window to stay comfortable.