Hemet is weird in January. Honestly, if you live here or you're just passing through the San Jacinto Valley, you’ve probably noticed that the "winter" label doesn't always fit. One day you’re wearing a t-shirt at a backyard BBQ, and the next, you’re frantically looking for a windbreaker because a Pacific cell decided to dump rain on the Santa Rosa Hills.
Understanding the weather Hemet 10 day outlook isn't just about checking a number on your phone. It's about knowing how the valley floor traps heat and how the winds off the San Jacinto Mountains can change your Tuesday plans in about twenty minutes.
Right now, we are looking at a classic Southern California split. The first half of this 10-day stretch is essentially a "False Spring," followed by a reality check of rain and cooler temperatures.
The Immediate Forecast: A Warm Front Surprise
If you’re looking at the weather Hemet 10 day cycle starting Friday, January 16, 2026, the heat is the headline. We are hitting a high of 79°F today. That is significantly higher than the historical January average of 63°F. It’s dry, too. Humidity is hovering around 46%, and the wind is just a light 3 mph breeze from the east.
- Friday (Today): High 79°F | Low 45°F. Sunny and basically perfect.
- Saturday: High 79°F | Low 47°F. Still warm, but we’ll see some "partly sunny" clouds creeping in.
- Sunday: High 78°F | Low 47°F. The peak of the warmth begins to level off.
These temperatures are great for hiking Diamond Valley Lake, but keep an eye on that 45°F low. The desert-adjacent climate means once the sun drops behind the hills, the temperature crashes. It’s a 34-degree swing. If you leave the house at 2:00 PM in a tank top, you’ll be shivering by 6:00 PM.
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Mid-Week: The Holding Pattern
By Monday and Tuesday (January 19–20), things stay stable. We’re looking at highs of 77°F and 78°F. The UV index is low—around a 2 or 3—so you won't get scorched, but the sun is still strong enough to feel.
Then comes Wednesday. This is the transition day. The high drops to 74°F, and we start seeing more cloud cover. The wind shifts. We go from those northerly/easterly breezes to a southwest flow. In Hemet, a southwest wind usually means moisture is being pulled in from the coast.
The Reality Check: Rain is Coming
Here is where the weather Hemet 10 day forecast gets interesting for anyone with outdoor plans. Thursday, January 22, marks a shift. We drop to 71°F, and by Thursday night, there is a 45% chance of light rain.
Friday, January 23, is the outlier. The temperature dives to 65°F. We’re expecting showers and light rain throughout the day. While a 45% chance might not sound like a washout, in the San Jacinto Valley, these systems can stall against the mountains and dump more water than the coastal cities see.
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- Temperature Slide: We go from 79°F on Friday to 65°F the following Friday.
- Precipitation: Expect the heaviest moisture late Thursday night into Friday evening.
- Humidity Spike: We’ll jump from a dry 24% humidity this weekend to over 61% by the time the rain hits.
Why Hemet Weather is Different
People often lump Hemet in with Riverside or Palm Springs. That’s a mistake. We’re in a transition zone. According to data from the James Reserve and local climate summaries, Hemet sits between a Mediterranean system and a continental desert influence.
This means we get the "Santa Ana" effect more intensely than some coastal spots, but we also get colder nights because of our elevation and the surrounding peaks. In fact, while the average high for January is 65°F, it is not uncommon to see these 80-degree spikes followed by 40-degree dips. It's a roller coaster.
Actionable Tips for the Next 10 Days
Don't let the 79-degree Friday fool you into thinking winter is over.
Layer like a pro. The 30+ degree difference between day and night is the biggest health risk this week. If you’re heading out, a light shell or sweater is mandatory for the evening, even if the afternoon feels like July.
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Water your plants early. With the humidity dropping to 24% on Saturday, your garden will feel the stress before the rain arrives on Thursday. Give everything a good soak now.
Check your wipers. We haven't had much rain lately, and the Friday, Jan 23 showers will make the roads slick with oil buildup. Ensure your car is ready for the 45% chance of precipitation before the clouds move in.
Basically, enjoy the sunshine while it lasts this weekend, but keep the umbrella near the door for the end of the week. Hemet is nothing if not unpredictable.
Next Steps for You: - Monitor the Friday, Jan 23 rain probability as the system moves closer; those 45% chances often sharpen into 80% or 10% within 48 hours.
- Plan outdoor activities for Monday or Tuesday, which offer the best balance of warmth and clear skies before the cooling trend begins.