Ideal Humidity for DIY Bath Bombs

Bath bombs are a simple and affordable way to make bath time a little more special. They can add color, scent, and a light fizz to your bath water, offering you countless options for personalizing your time in the tub. 

One of the best ways to get the most out of bath bombs is to make them yourself at home. Because bath bombs are composed of two basic ingredients that are easy to get hold of (baking soda and citric acid), as well as other simple elements such as cornstarch, food coloring, and essential oils, creating your own is nearly as easy as purchasing them from the store. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to, or

Ideal Humidity for DIY Bath Bombs

The best humidity for making bath bombs is between 35-40%. At this level, it is not so high to cause crumbling issues, or low to create cracks when storing and trying to dry your DIY bath bombs.

It is best to make bath bombs in an environment with less than 40 percent humidity. You can get humidity monitors from countless retailers to double-check before you get started on your recipe. [I recommend one just below].

Similarly, if you live in a fairly humid climate, sometimes you can just feel it in the air when the humidity levels are too high for making bath bombs.  In this case, a Dehumidifier in a small working room is your best solution.

Remember to choose a Dehumidifier for home use (Amazon link) rather than industrial, although pricing will guide you the best in this case.

The most important thing to consider is the size of the room and the size of the relevant humidifier to work.

My advice is to always buy a humidifier that says it will do a room about 25-50% larger than yours, so you do not have to run it at 100% constantly. It will be expensive to do so and the unit will not last as long.

You will save the extra dollars spent on the larger model in running and replacement costs very quickly!

This 4500 Sq Ft model from Amazon, is more than big enough for most bath bomb makers and can be used for the entire basement or anywhere else in the house.

If you live in a dry climate that doesn’t get much precipitation, this likely won’t present an issue for you. Air that has significantly low levels of humidity won’t have the same damaging effects on your DIY bath bombs as air that is exceptionally humid. 

Check Humidity when Making Bath Bombs with a Hygrometer

The first thignt o ignore is the weather forecast. Quite apart from it being inaccurate most of the time, it will be providing a genral humidity level, and only applies for out of doors.

You are making your bath bombs inside, and need to know the humidity level wherever you are working and storing your creations.

An inexpensive and portable way to keep tabs on the humidity in your work and storage area is a simple digital tool, that will read both the tempreture and humidity.

I like this Humidity monitor from Amazon. It has either a stand or can be wall-mounted. I prefer to place it where I am working and to check my storage area, so the portability is a plus. As an additional benefit, it also records high and low records, so you can see if the situation has changed throughout the working or storage period.

It could help identify the root cause of why your bath bomb has cracked or is crumbling

Factors to Consider When DIY-ing Bath Bombs

One of the main things you need to have when you decide to make your own bath bombs is a recipe. There are a lot of recipes available online, ranging from concoctions that can relieve sore muscles to creations that are simply colorful and pleasantly scented. It’s up to you to decide what kind of benefits you want to get out of your bath bomb, so explore your options!

Another thing to consider when making your own bath bombs is the humidity level of your home. The way that bath bombs work is by triggering a chemical reaction when the baking soda and citric acid are placed in water. Because water is a key factor in the chemistry of bath bombs, it’s important that you aren’t triggering the reaction until you’re ready for your bath.

That’s why it’s important to pay attention to humidity. Too much humidity in the air while you’re making your bath bombs can cause them to lose shape. It might even prevent the ingredients from binding at all, leaving you with a crumbled and useless mess.

How to Make Bath Bombs in High Humidity

If you’re not willing to be deterred by humid air and you’re determined to make some DIY bath bombs, there are luckily quite a few solutions and options.

You don’t have to let the weather stop you from making your bath bomb creations and enjoying your bath time. 

One of the most common tips for making bath bombs in high humidity is to leave Epsom salt out of the recipe. Salt absorbs moisture from the air, so if there is a significant amount of water in the air for it to soak up, chances are that the salt will cause the ingredients to react and the bath bomb will start to dissolve before it can even reach the bathtub.

Another option for making bath bombs successfully in a humid climate to include a hardener in your recipe, such as kaolin clay or cream of tartar.

These ingredients can help the bath bomb become firm more quickly, which will cut down on the time that the baking soda and citric acid have to react with the moisture in the air as it dries. 

Lastly, if you’re really serious about making your own bath bombs but you live in a humid climate, you could consider investing in a dehumidifier for the room where you do the majority of your mixing and molding.

Dehumidifiers are available in a range of styles and prices, so if DIY bath bombs are your passion, they could be a great solution for you.

Final Thoughts

All in all, making bath bombs from the comfort of your own home is an enjoyable and rewarding way to create your own bath time fizzers without spending a significant amount of cash on products from corporate brands.

It allows you to explore your own sense of creativity and could even lead you toward a work of art that becomes your best-kept bath time secret.

Ensuring that you are making your bath bombs in the ideal environment is the key to success, especially in regard to humidity levels.

Bath bombs are best created in air that has less than 40 percent humidity, but that doesn’t mean you’re out of luck if you live in a humid climate. Try out our tips and tricks so that you can be on your way to bath time bliss! is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to, or

A Few Essentials and My Favorite Things

Because there are so many places to find and so much information to go through on-site, I thought I would bring a few of the most popular items from the site, and my favorite products all in one place so you can check them out easily.

Bath Bomb Maker

Take your bath bomb making to the next level and go from making 10 in a day to 10 in just a few minutes. The B-3 Bath Bomb Machine is the best on the market and helps turn around orders in super quick time

Bath Bombs for Men

Go figure this is the most popular area of the website, guys love bath bombs or you ladies like buying them for him.


The biggest problem often for bath bomb makers or soap makers is the humidity. This 4500 Sq Ft model from Amazon, is more than big enough for most bath bomb makers and can be used for the entire basement or anywhere else in the house.


The one thing you will need if you are making bath bombs, shower steamer or homemade soap is some good and reliable digital scales so your measurements can be as precise as digitally possible. These Kitchen Scales are from Amazon’s Choice, and they are mine too, as they are solid, reliable and inexpensive.

I hope you find everything you have come to Bath Bomb Guide to look for and enjoy the site.

My Favourite Bath Bombs

This is my favorite bath treat set from Amazon which includes a bath bomb, salts, and more, It is the perfect all-round package, all of which are included here on the bath bomb guide site, in the various sections

Turkish Cotton Towels

My towels are one of my favorite things. A soft, fluffy Turkish bath sheet to wrap up in is the best compliment to a bath or shower. Sometimes I just take it out of the cupboard and wrap up on the couch watching TV! Being Turkish cotton they last really well.

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