Published: April 12, 2026 · A complete guide
Body weather is a simple way to understand how your body feels today, expressed as a weather forecast instead of a number. Rather than showing you a score you need to interpret, it translates your biometric data into something instantly meaningful: Sunny means you are well-recovered, Stormy means your body is under stress and needs rest.
The concept was created by LuminaEco for the Atmos app. It takes the complexity out of heart rate variability, resting heart rate, and sleep data and gives you a single glanceable answer to "How am I doing today?"
Instead of waking up and guessing whether you are recovered enough for a hard workout, you check your body weather. It is the same idea as checking the real weather before deciding what to wear — except the forecast is about you.
Atmos reads your biometric data from your smartwatch, normalizes each metric against your personal baseline (not population averages), and combines them into a readiness score from 0 to 100.
The normalization step is important. It means Atmos is comparing you to yourself, not to some generic population average. Your baseline adapts over a rolling 14-day window, so seasonal changes, lifestyle shifts, and fitness improvements are all accounted for.
That readiness score maps to one of five weather states:
| State | Score Range | What It Means |
|---|---|---|
| Sunny | 80 - 100 | You are well-recovered. Great day for a hard workout or important meeting. |
| Partly Cloudy | 60 - 79 | You are doing okay. Normal activity is fine, but maybe skip the personal record attempt. |
| Cloudy | 40 - 59 | Your body is a bit run down. Consider a lighter day. |
| Rainy | 20 - 39 | You are noticeably stressed or under-recovered. Prioritize rest and sleep. |
| Stormy | 0 - 19 | Your body is sending strong signals. Rest today. Cancel what you can. |
All processing happens on your phone. No data is sent anywhere.
The key idea behind body weather is personalization. Atmos does not compare you to population averages. It builds a 14-day rolling baseline of your own biometric data and measures today against your recent normal. A drop that is significant for you will register as a weather change, even if your raw numbers look "fine" compared to someone else.
Body weather relies on three biometric signals from your smartwatch. These three together give a surprisingly complete picture of daily readiness:
Atmos reads this data from Apple Health (iOS) or Health Connect (Android). Access is read-only — the app never writes to or modifies your health records.
You do not need to manually log anything. If your smartwatch records the data, Atmos picks it up automatically. The less you have to think about, the more likely you are to actually use the information.
No. Body weather is a wellness visualization tool, not a medical device. It is not FDA-regulated and does not diagnose, treat, or prevent any disease.
It simply helps you understand patterns in your biometric data so you can make better daily decisions about rest and activity. Think of it like a mood ring that actually works — it reflects real data, but it is not telling you that you are sick or healthy in a medical sense.
A fitness score (like VO2 max or a training status) tells you how fit you are overall. It changes slowly over weeks and months. Body weather tells you how you feel today — it changes every morning based on last night's sleep and your current biometric state.
Think of it this way: your fitness score is your climate. Your body weather is today's forecast. A very fit person can still have a Stormy day after a terrible night of sleep. Both metrics are useful, but body weather is a daily decision tool.
Most fitness scores also require weeks of data to become meaningful. Body weather gives you a useful reading from your very first morning — as long as your watch has recorded at least one night of sleep, heart rate, and HRV data.
Body weather becomes most useful when you build it into your daily routine. It takes about a week for most people to start acting on their forecast instead of just checking it. Here are the most common use cases:
The common thread across all of these use cases is the same: body weather turns vague feelings into actionable information. You probably already sense when you are run down. Body weather gives that sense a name and a data-backed confirmation. For more ideas on using body signals, read our guide on how to read your body.
Body weather was created by Atmos, made by LuminaEco. Atmos runs 50 on-device features including readiness scoring, trend analysis, and personalized baselines. It works with Apple Watch, Oura, Whoop, Garmin, Fitbit, and any device that writes to Apple Health or Health Connect.
Atmos has a free tier with core body weather features and a Pro subscription at $9.99/month for advanced insights like trend analysis and detailed breakdowns. Unlike Whoop ($30/month) or Oura ($5.99/month after buying the ring), Atmos does not require any additional hardware — it uses the smartwatch you already own. See how Atmos compares to other wellness apps.
Yes. Atmos processes everything on your device. There is no server, no cloud upload, and no tracking. Your biometric data never leaves your phone. Old data is automatically deleted after 90 days. You do not even need to create an account to use the app.
LuminaEco does not run analytics, does not show ads, and does not sell or share your information with anyone. The app does not even require an account to use. Read the full LuminaEco privacy policy or our detailed guide to how LuminaEco protects your health data.