Mortgage Rates Today, Dec 18: 30-Year Refinance Rate Rises by 7 Basis Points

As of December 18, 2025, homeowners looking to refinance their mortgages will find that rates have nudged higher, with the popular 30-year fixed refinance rate now sitting at 6.69% following a 7 basis point increase. This update from Zillow signals that while we've seen some interest rate cuts from the Federal Reserve this year, the cost of borrowing for refinancing isn't following suit directly, and in fact, is climbing for now.

It’s that time of year when many of us start thinking about year-end wrap-ups and looking ahead. For many homeowners, that includes evaluating their mortgage. If you've been watching the refinance rates, you'll know there's been a lot of chatter about them. Today, December 18th, 2025, brings us a bit of news that might make you pause.

Mortgage Rates Today, Dec 18: 30-Year Refinance Rate Rises by 7 Basis Points

What’s Happening with the Numbers?

Let's break down what this means across different loan types, based on Zillow's reporting:

• 30-Year Fixed Refinance Rate: This is the big one for many homeowners. It has specifically climbed 7 basis points, moving from 6.62% to 6.69%. Just last week, the average was 6.67%, so we're seeing a steady, albeit small, upward trend. This suggests lenders are adjusting their offerings based on broader economic signals.
• 15-Year Fixed Refinance Rate: If you're looking at a shorter loan term, you'll see a similar upward movement. This rate has jumped 9 basis points, going from 5.64% to 5.73%. While shorter loans usually come with lower rates, the fact that they're also rising shows that the pressure is felt across the board.
• 5-Year Adjustable-Rate Mortgage (ARM) Refinance Rate: This type of loan has seen the most significant jump. The 5-year ARM refinance rate surged by 22 basis points, rising from 7.20% to 7.42%. This highlights the inherent volatility of ARMs, especially in a climate where rates are generally on the move.

Why Are Rates Going Up When the Fed Is Cutting?

This is where it gets a little more nuanced, and it's something I’ve seen play out many times in my years following the mortgage market. You might be thinking, “Wait, didn't the Federal Reserve just cut interest rates?” Yes, they did – this is reportedly their third cut of 2025. However, mortgage rates don't directly mirror the Fed's own overnight lending rate. Instead, they are more closely tied to the 10-year Treasury yield.

Think of it this way: When the Fed signals that its interest rate-cutting spree might be winding down, investors start to get a sense that future borrowing costs could tick up. They react to this anticipation, and the yield on longer-term government bonds, like the 10-year Treasury, increases. Since mortgage lenders often use these Treasury yields as a benchmark for their own loan pricing, mortgage rates tend to follow suit. So, even though the Fed is trying to make borrowing cheaper in general, expectations about the future are what’s really driving mortgage rate movements right now.

What Does This Mean for You?

This shift in rates has some real-world implications for homeowners looking to refinance:

• Higher Monthly Payments: Even a seemingly small increase of a few basis points can add up over the years. If you were on the fence, these rising rates might mean your potential savings are shrinking, or your monthly payment could actually increase compared to what you might have locked in just a few weeks ago.
• Timing is Crucial: In a rising rate environment, acting sooner rather than later can be beneficial. If you've been considering refinancing for a while and have found a rate that works for you, it might be a good idea to lock it in before it goes up further.
• Choosing the Right Loan:
  • Fixed-Rate Loans: These offer stability. The 30-year fixed at 6.69% or the 15-year fixed at 5.73% provide predictability in your monthly payments. If you value certainty and plan to stay in your home for a long time, these might still be attractive, even with the slight increase.
  • Adjustable-Rate Mortgages (ARMs): The 5-year ARM at 7.42% shows the risk involved. While ARMs can start with lower rates, you need to be comfortable with the possibility that your rate – and therefore your monthly payment – could increase significantly when the fixed period ends. With rates trending up, ARMs feel more uncertain right now.

Refinance Activity: A Mixed Bag

Despite the recent uptick in rates, refinance applications actually dipped slightly last week, by 4%. This is a natural reaction when rates start to climb after being at their lowest points.

However, it's important to put this into perspective. Year-over-year, refinance demand is still incredibly strong, showing an 86% surge compared to this time last year. Refinances are currently making up a significant 59% of all mortgage applications, a level we haven't seen since September. This indicates that a lot of people are still refinancing, particularly those who took out loans in late 2023 or 2024 when rates were above 7%.

On the flip side, a very large portion of homeowners – roughly 70% – are still benefiting from those super-low pandemic-era rates under 5%. For them, refinancing at 6.69% or higher just doesn't make financial sense right now, so they're staying put.

Looking Ahead to 2026

What does this all mean for the rest of 2026? Most housing economists are predicting that mortgage rates will likely stay within a 6% to 6.5% range through the early part of the year. S&P Global Ratings has a slightly more optimistic outlook, suggesting that if inflation behaves, we might see a gradual decline towards an average rate of 5.77% over the course of 2026.

My take on this is that while the days of consistently sub-5% refinance rates are likely behind us for now, the market is still finding its footing. The slight increases we're seeing today are likely part of that adjustment process. For homeowners, it reinforces the need to stay informed, run the numbers carefully, and not get caught up in trying to perfectly time the market – a task that's often more art than science. Focus on whether refinancing genuinely improves your financial situation based on your specific circumstances.