If you’ve noticed your weekly Google Ads spending going up or down unexpectedly, you’re not alone. Ginny Marvin, Google’s Ad Liaison, recently explained the two big reasons behind this trend: shifts in market conditions and changes to campaign budgets.
While the fluctuations can be frustrating, there’s good news—you’ll never overshoot your monthly budget. Here’s everything you need to know about why this happens and how to stay ahead of the game.
The Two Big Culprits Behind Ad Spend Swings
In a post shared on X, Ginny Marvin broke down the reasons for these fluctuations. “Weekly spend fluctuations are typically due to changing market conditions (weather events, industry trends, etc.) and/or any recent budget changes in the campaign,” she explained.
Weekly spend fluctuations are typically due to changing market conditions (weather events, industry trends, etc.) and/or any recent budget changes in the campaign. While the average weekly spend can fluctuate up/down with changing market conditions, campaigns won’t exceed their…
— AdsLiaison (@adsliaison) January 17, 2025
Here’s what that means:
- Market conditions: Seasonal trends, holidays, and even unexpected events like storms can drastically affect ad performance and how much is spent in a given week.
- Budget changes: If you’ve recently adjusted your campaign’s budget, even slightly, it can create temporary imbalances in weekly spending.
For industries that thrive on seasonal demand—think fashion, travel, or events—these changes can be even more dramatic.
Monthly Budgets Are Still in Check
Despite the ups and downs, there’s one thing you don’t have to worry about—your monthly budget will always stay intact.
As Marvin explained, “Campaigns won’t exceed their monthly spend limit.”
To add an extra layer of reassurance, Google notifies advertisers mid-month if their Local Services Ad (LSA) campaign is running out of funds. This heads-up gives you a chance to adjust before your campaign is impacted.
Transparency Is Good, But It Could Be Better
While it’s great that Google is addressing these concerns, more could be done. For example, imagine a feature that predicts fluctuations before they happen. This would allow advertisers to plan better and avoid surprises.
Transparency is essential, but so is giving users tools to act on that transparency.
Why This Matters for Advertisers
If you’re running a business, these spending shifts can have real consequences. For small businesses with limited budgets, unexpected fluctuations might disrupt marketing plans or leave campaigns underperforming.
Larger companies with dedicated marketing teams may have the resources to monitor and adjust, but for smaller advertisers, these swings can feel like a moving target that’s hard to hit.
Google’s explanation is a start, but advertisers need actionable tools to adapt in real-time.
What Google’s Statement Means for the Future
This isn’t the first time Google Ads has faced scrutiny over its algorithms and ad spending behavior. But this explanation signals Google’s attempt to address advertisers’ pain points.
Over the years, they’ve rolled out tools like campaign performance insights and audience targeting options to help advertisers navigate the complexities of their platform.
The next logical step? Predictive analytics give advertisers foresight into how market trends or budget tweaks will affect their campaigns.
What You Can Do to Stay Ahead
While we wait for more advanced solutions from Google, there are practical steps you can take to manage your campaigns and reduce surprises:
Monitor weekly and monthly trends: Keep an eye on how your campaign performs week to week, but always focus on the monthly spend cap.
Plan for unpredictability: Build a buffer into your budget to account for seasonal trends or unexpected events.
Use mid-month notifications: When Google notifies you that your budget is nearing its limit, take action immediately.
Leverage historical data: Look back at previous campaigns to identify patterns in market behavior.
Communicate effectively: Keep everyone involved in your campaign aligned to make quicker adjustments when needed.
Key Takeaways
- Weekly ad spend changes are caused by market conditions and budget adjustments.
- Google ensures your monthly spending limits are never exceeded.
- Advertisers are notified mid-month if budgets are nearing their cap.
- Seasonal shifts and unexpected events play a significant role in spending patterns.
- Proactive planning and data analysis can help businesses stay in control.
Dileep Thekkethil
AuthorDileep Thekkethil is the Director of Marketing at Stan Ventures, where he applies over 15 years of SEO and digital marketing expertise to drive growth and authority. A former journalist with six years of experience, he combines strategic storytelling with technical know-how to help brands navigate the shift toward AI-driven search and generative engines. Dileep is a strong advocate for Google’s EEAT standards, regularly sharing real-world use cases and scenarios to demystify complex marketing trends. He is an avid gardener of tropical fruits, a motor enthusiast, and a dedicated caretaker of his pair of cockatiels.