Key Takeaways
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Watercolor plein air painting means working outdoors on location, where shifting light and wind demand fast, decisive choices instead of working from a photo.
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Most beginners stall before their first brushstroke because gear decisions eat daylight and drain the joy out of painting outside.
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The five essentials of plein air watercolor painting are a small palette, 100% cotton cold-press paper, three round brushes, a water source, and paper towels.
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Some tips to paint plein air are choosing a simplifiable scene, snapping a reference photo before the light shifts, and committing to bold darks against preserved whites.
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Tobio's Watercolor Kit packs a walnut wooden palette, 12 paint tubes, a water brush, an absorbent wristband, a metal clip, a cotton paper sketchbook, and a digital guide into a pocket-sized case that opens in just seconds.
What Is Plein Air Watercolor Painting?
Plein air watercolor painting is the practice of painting outdoors, on location, instead of working from a photo back in a studio. The term comes from the French phrase meaning "in the open air," and it changes how you paint because the light, wind, and shadows are all moving while you work. That pressure is what makes the style distinct from any other kind of watercolor practice.
Most people assume the hard part is technique, when it's actually logistics. A painter who spends the first ten minutes on location digging through a bag for the right brush or mixing a palette from scratch loses the exact light they came outside to capture. The scene in front of you will not wait for your setup to finish.
Tobio's Kits removes that friction by keeping every core supply, palette, paint, brush, and paper in one case that opens in seconds. That means less time managing gear and more time actually painting while the light is still good.
Tobio's Kits: Everything You Need to Start Painting, In One Box
Complete Starter Kit | Ages 6+ | No Art Experience Needed
Tobio's portable watercolor kit puts everything in one compact box (pans, paper, and a wooden palette) so you can start painting right away, whether you're at home or on the go. No separate shopping, no guesswork. Just open the box and paint.
✓ A truly portable all-in-one kit, not just the wooden palette (unlike cheaper lookalikes)
✓ Pre-sketched Beginner Workbook with 30 guided illustrations, so no drawing required
✓ Curated supplies that work together, designed for beginners without the overwhelm
✓ Great for ages 6+ and thoughtful gift-givers who want to give something meaningful
Creativity should feel welcoming, not overwhelming.
What Supplies Do You Need for Plein Air Watercolor Painting?
1. Watercolor Paints
When selecting colors for your outdoor palette, keep it minimal but versatile. A limited palette forces creative color mixing and keeps your bag light. Most experienced plein air painters work with:
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A warm and cool version of each primary color
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A reliable earth tone
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A strong dark
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A go-to blue for skies
2. Watercolor Paper or Sketchbooks
Your paper choice directly affects how your paint behaves, especially outdoors where humidity and wind are factors. Always use 100% cotton, cold-press, and thick watercolor paper. Lighter paper warps badly when wet, which makes controlled washes nearly impossible.
A plain sketchbook can also work. Look for one with thick, cotton pages that hold up to outdoor washes without warping. At Tobio's Kits, we stock 60-page sketchbooks that give you enough room to work through multiple sessions and try different compositions, without committing to a full pad of loose sheets.
3. Brushes
You do not need a full brush set. For outdoor plein air painting, three brushes can handle almost everything: a large round (size 12 or 14) for washes and skies, a medium round (size 8) for mid-sized shapes, and a small round (size 4) for fine details.
A flat brush can also double as a wash brush for broad areas. Synthetic brushes hold up better in outdoor conditions and are lighter to carry. A water brush is another option worth packing for plein air work, since it stores water inside the handle and removes the need for a separate rinse cup.
Using a water brush means you don't need to pack a separate container for rinsing.
4. A Two-Well Water Container
This is a small detail that makes a big difference. A two-well container keeps your clean water separate from your dirty rinse water, which protects the clarity of your colors.
However, if you have a water brush, you can skip this supply entirely, since the handle stores clean water and releases it as you paint. That means one less item to pack, refill, or worry about tipping on uneven ground.
5. Paper Towels
Paper towels do more outdoors than most painters expect. You will use them to lift excess water off your brush, blot mistakes before they set, soften edges on a wet wash, and clean your palette between color mixes.
Bring more than you think you need, since wind and heat dry your work faster and you will reach for them constantly. A small roll or a folded stack in a zip bag travels well and stays dry.
Plein Air Watercolor Painting Supplies: Summary Table
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Supply |
Why It Matters |
Beginner-Friendly Pick |
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Watercolor Paints |
A limited palette forces cleaner mixes and lighter packing |
Warm/cool primaries, one earth tone, one strong dark, one sky blue |
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Paper or Sketchbook |
100% cotton, cold-press paper prevents warping outdoors |
Tobio's 60-page cotton sketchbook |
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Brushes |
Three rounds cover washes, shapes, and detail work |
Sizes 4, 8, and 12 or 14 (synthetic) |
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Two-Well Water Container |
Keeps clean and dirty water separate; skip it if you're using a water brush |
Optional, not needed if using Tobio's water brush |
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Paper Towels |
Lifts water, blots mistakes, softens edges |
A folded stack in a zip bag |
5 Tips for Plein Air Watercolor Painting
1. Use an All-in-One Watercolor Kit
The Tobio’s Watercolor Kit makes plein air painting simple and convenient.
An all-in-one kit removes the biggest barrier to painting outdoors: setup time and forgotten supplies. Tobio's Watercolor Kit packs a walnut wood palette, 12 watercolor tubes, a water brush, a thick cotton paper sketchbook, an absorbent wristband, a digital guide, and a metal clip into a pocket-sized case that opens in seconds.
Because the water brushes hold their own water, you can skip the cup and sink entirely. Fewer decisions before you paint means more time actually painting, which matters when outdoor light shifts fast.
2. Select the Right Subject
Look for a scene you can simplify into a few clear parts before you commit. The best plein air subjects break down cleanly into light values (sky, grass, sunlit walls), a large connected midground shape like a treeline or building, and a smaller foreground with texture.
If you cannot see those three layers in front of you, keep walking. A subject that fights the wash-then-detail process will slow you down every time.
3. Capture a Photo of the Scene
Snap a reference photo before you start painting. Outdoor light shifts every now and then, which means the shadow shapes and value pattern you saw at setup will not be there an hour later.
A quick photo locks in those value shapes so you can keep working from the original look, even as the sun moves. It also gives you a reference to touch up the painting back at home.
4. Direct Viewers by Maximizing Horizontals, Verticals & Diagonals
Strong composition is what separates a compelling plein air painting from a pretty snapshot of a scene. Deliberately maximizing the three primary line directions (horizontals, verticals, and diagonals) can control where a viewer's eye travels through your painting. Horizontals create calm and space, verticals create strength and height, and diagonals create movement and energy.
Before you make a single brushstroke, identify the dominant line direction in your scene and decide how to use it intentionally. A wide horizontal shoreline becomes more powerful when a single strong vertical (a pier post, a figure, a tall tree) cuts through it. That tension between directions is what creates visual interest and keeps viewers engaged with the painting longer.
5. Maximize Contrast for Light & Shadow
Natural light outdoors is far more dramatic than studio lighting, and watercolor is uniquely positioned to capture it, but only if you are bold with your darks. Many beginners paint their shadows too light because they are afraid of going too dark and losing the ability to correct it. The result is a painting that feels flat and washed out despite being technically accurate.
Commit to strong, dark shadow shapes early, preserve your whites completely, and the light in your painting will feel like it is genuinely glowing.
Tobio's Kits Makes Plein Air Painting Simple From the Start
The Tobio’s Watercolor Kit comes with 12 colors that can help you get started with plein air painting.
Plein air watercolor rewards preparation more than skill. The right five supplies, a scene simplified into clear shapes, and the willingness to commit to bold darks will do more for a painting than any expensive add-on. Painters who travel light and set up fast get more time with the light that drew them outside in the first place.
We built the Tobio's Watercolor Kit so beginners can skip the gear-shopping stress and start painting outdoors in about a minute. Everything you need, from the watercolor palette and travel water brush to the cotton paper sketchbook and walnut wood palette, fits into one pocket-sized case. Grab your Tobio's Watercolor Kit and get outside with it today.
Frequently Asked Questions (FAQs)
What is the plein air art style?
Plein air is the practice of painting outdoors, on location, in direct observation of the subject rather than from photographs or studio setups. The term comes from the French phrase en plein air, meaning "in the open air." The technique prioritizes capturing natural light, atmosphere, and the immediate visual experience of a place. Because outdoor light shifts constantly, plein air painters must work quickly and decisively, making bold choices about color, value, and composition in real time.
How is plein air painting different from indoor painting?
Indoor painting gives you full control: consistent light, unlimited time, and no environmental variables. Plein air painting removes most of that control and replaces it with immediacy, unpredictability, and direct sensory experience. The light shifts every now and then, the wind moves your paper, and the scene in front of you is three-dimensional and complex in a way no photograph fully captures.
What is the golden rule of watercolor painting?
The golden rule of watercolor painting is to work from light to dark. Because watercolor is transparent, you cannot paint a lighter color over a darker one and expect it to show. Your lightest values (including your brightest whites) must be preserved from the very beginning, either by leaving the white of the paper untouched or by masking those areas before you begin painting.
Is plein air painting good for beginners?
Absolutely, and in many ways, plein air is one of the best ways for beginners to accelerate their development. The time pressure prevents overworking and overthinking, two of the most common problems beginners face. Starting with small formats keeps sessions manageable and helps build confidence quickly. An all-in-one kit simplifies the gear decisions so you can focus entirely on observing and painting rather than troubleshooting your equipment.
What does Tobio's Watercolor Kit include?
Tobio's Watercolor Kit includes a pocket-sized walnut wood palette, 12 watercolor paint tubes, a refillable water brush, a cotton-paper sketchbook, a metal clip, an absorbent wristband, and a compact carrying case. The whole set is built for plein air work: the water brush holds its own water, and the case opens in seconds, so you can paint outdoors without extra gear. It fits in a bag or jacket pocket and travels easily wherever the light is good.
*Disclaimer: Tobio's Kits watercolor supplies are designed for ages 6 and above. As with all art materials, paints are not food-safe and should be kept away from the mouth. Best suited for beginner to intermediate painters. Visit Tobio's Kits to explore our full range of art kits and find the right set for you.