For WeatherFlow Tempest owners
Give your Tempest a dashboard you’ll keep coming back to. Watch your weather change, right there on your desk, wall, or favourite screen.
Runs in your browser. No card needed for Free.
From people who watch their weather
“What a great product and the dev is very responsive. If you have a Tempest, you need this.”
5 / 5
“I've been using Halcyon for a while now and really love it.. I also use WeatherDisplay and Halcyon gives WD a run for their money. Great UI. Fast updates. The only thing I could recommend is a "light" theme. A little hard to see on my laptop but that's a petty thing. A++++”
5 / 5
“Love it, have the Tempest and the PurpleAir devices and can see both at same time with this app and can use a free login to display HD weather map overlays!”
5 / 5
“The more I use it, the more I like it.”
5 / 5
“Very impressed with Halcyon - I use it for both my properties with Tempest and Purple Air sensors. I use it primarily on a control tablet, but do have it installed on my PC and iPhone. Really like the configurable modules, and the UI. But most of all the developer has been incredibly diligent and responsive, and has added features and resolved issues non-stop. Huge recommendation for the app as well as the developer.”
5 / 5
“Nice color graphs. Can watch this all day long. Now I know the weather data! Thank you!”
5 / 5
“This feels like the kind of app Tempest should have made! I really appreciate seeing the times of day for the highs and lows. Plus, there’s so much more info, and the layout is fantastic!”
5 / 5
“Great weather information display for my Tempest weather station. Quite responsive and all the features I need. Has some radar issues, my fault. Support jumped right on it, outstanding.”
5 / 5
“Best web-based app, best developers! The app delivers WAY beyond what the original product/app could ever hope to do! Halcyon (DAB Worx) crew listens to its users, and they continually deliver beyond expectations every time! They’re second to none.”
The gust that just shook the trees. The rain starting on the roof. The hottest afternoon you’ve recorded. Give it all a place on your screen.
Live dashboard · Free and up
Wind shifts. Rain gathers in the gauge. Lightning lights up as your Tempest detects a strike. Your station’s readings become a dashboard you can follow from across the room.
Give a spare tablet a new job. Keep your station beside you at your desk. Open Halcyon in a modern browser and make it part of your day.
Try the real storm replayFree: choose four of eight panels on two screens. Basic: six slots, all 11 panels, and unlimited screens.
History, records & patterns · Plus
How hot did your garden get last summer? Was that your biggest gust? When does the rain usually arrive?
Import your available Tempest history and explore it with interactive charts, heatmaps, a wind rose and a rainfall calendar. Find your records, with the date and time of each one, and discover your station’s patterns in plain language.
Explore Plus
Explore a storm, compare seasons, or zoom out to your whole archive. Add a note when you move a sensor. Export the readings when you want to work with them yourself.
Charts, records, annotations and CSV export are included with Plus.
Sensor checks · Plus
Our own barometer was reading about 100 mb too low for nearly two years. It kept sending data. Halcyon’s checks brought the problem into view.
Halcyon looks back through your history and keeps checking for stuck, drifting or implausible readings. A person reviews the evidence before a sensor notice reaches you. You get an explanation and a report you can share with WeatherFlow support.
Read our Tempest review, story and fleet findings
Free and up
Live precipitation radar, your forecast, and astronomy with sun and moon information. Choose the four panels you want on Free.
Basic and up
NWS and Environment Canada alerts for your station’s location. Critical warnings can take over the display with an attention tone.
Basic and up
Cycle through all 11 panels, switch stations, sync your settings and share a public link. Add PurpleAir and aviation readings with your own API keys.
Basic / Plus
Halcyon Weather comes with Basic. Station Records comes with Plus. Add either recipe to your TRMNL with your Halcyon key.
Halcyon runs in your browser. Connect your WeatherFlow Tempest and use a screen you already own.
Start freeStart free and we’ll email it to you. Four live panels, on up to two screens. No card and no trial countdown.
Create a free WeatherFlow personal access token. Enter it with your Halcyon key and choose your station.
Pick your panels and units, then open your dashboard in your browser. Keep it full screen on a tablet or beside your work on a monitor.
Start with the free plan, or try a paid plan free for 7 days. All prices in USD.
Your first always-on weather dashboard.
No card. No trial clock.
Settings stay on each device. Alerts, cloud sync and history need a paid plan.
Your complete dashboard, across your screens.
Billed $14.99 yearly
Renews at $14.99/year
7-day free trial
Charts, historical records and sensor checks come with Plus.
Your station’s history, records & deeper insights.
Billed $59.99 yearly
Renews at $59.99/year
7-day free trial
Explore the full charts experience during your 7-day trial.
Paid plans: no charge for 7 days. Cancel during your trial to avoid a charge.
We never sell your weather data. Already have a key? Activate it
| Feature | Stock Tempest App | PiConsole | Grafana Stack | Halcyon Free | Halcyon Basic | Halcyon Plus |
|---|---|---|---|---|---|---|
| Animated panels | ✗ | ✓ | ✗ | ✓ | ✓ | ✓ |
| Live precipitation radar | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| Air Quality (PurpleAir) | ✗ | ✗ | ✗ | ✗ | ✓ | ✓ |
| Zero setup | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| Cloud-synced config | ✗ | ✗ | ✗ | ✗ | ✓ | ✓ |
| No hardware required | ✓ | ✗ | ✗ | ✓ | ✓ | ✓ |
| Weather alerts | US | ✗ | ✗ | ✗ | US / CA | US / CA |
| Manual or timer panel rotation | ✗ | Manual | ✗ | ✗ | Manual + timer | Manual + timer |
| Charts, heatmaps & history | ✗ | ✗ | DIY | ✗ | ✗ | ✓ |
| Cost | Free | Free + Pi (~$85) | Free + server (~$5–15/mo) | Free | $14.99/yr | $59.99/yr |
Weighing a tablet, a LightMap or a Raspberry Pi too? See every Tempest display option, compared.
Something else on your mind?
Talk to the person building it.
A WeatherFlow Tempest weather station and a personal API token (free from tempestwx.com). That's it.
Yes. Free gives you a four-panel live dashboard from your Tempest — pick any four of Temperature, Wind, Pressure, Rainfall, Lightning, Forecast, Astronomy and Radar — on up to two screens at a time, with no card, for as long as you use it. (A free account nobody opens for a month is deleted, after a week's warning by email.) Basic ($14.99 a year) adds as many screens as you like, six slots that cycle through all eleven panels, severe weather alerts, the aviation and air-quality panels, multiple stations, settings that sync across your screens, and a public share link. Plus adds the full charts and history suite.
Any device with a modern web browser. It's designed for always-on displays (Raspberry Pi + screen, a wall-mounted tablet, a spare monitor) but works great on desktops, laptops, and even a 65-inch living room TV via Chromecast or AirPlay.
Yes. Your settings sync to the cloud. Enter your license key on any device and your full configuration loads automatically. (Basic and above. Free runs on two screens at a time and keeps settings on each device.)
Your 7-day free trial includes the full charts experience. After 7 days, your subscription continues on the plan you chose — Basic ($14.99/yr) or Plus ($59.99/yr). Cancel anytime during the trial and you won't be charged.
We never sell or share your data. When you view your own dashboard, live readings stream from WeatherFlow straight to your browser. Your WeatherFlow access token and settings are stored with your account so the dashboard follows you between devices. Some features do go through our servers: guest share links serve your station's data from our cache, and on Plus we import and store your station's history to draw charts. The privacy policy has the details.
We monitor for API changes and push updates immediately. You don't have to do anything — Halcyon updates automatically.
Yes, anytime. Your subscription runs through the end of the paid period.
Yes! Chrome: three-dot menu → Save and Share → Install page as app. Edge: three-dot menu → Apps → Install this site as an app. Safari (Mac): File → Add to Dock. Safari (iOS): Share → Add to Home Screen. Firefox doesn't support app install, but you can use F11 for full-screen mode. All options give you a clean, dedicated weather display.
Everything your station has ever recorded, made explorable. Import your complete Tempest history (years of data), then dig in with interactive charts for temperature, humidity, pressure, wind, rain, and lightning: hourly heatmaps that reveal seasonal patterns, a wind rose, a rainfall calendar, climate clouds that plot two metrics against each other, and side-by-side comparisons. A records dashboard tracks your hottest day, biggest gust, wettest hour, and dozens more — each with its exact date and time, across week, month, year, and all-time views — and automatically surfaces your station's patterns in plain language. You can also pin annotations to your timeline and export any range to CSV. And Halcyon checks your station's whole history for sensor faults — readings that have stuck, drifted or stopped making sense — against its own past and, for pressure, against every other Halcyon station. A person reviews anything it finds before you hear about it, on your History page, and confirmed bad days are kept out of your records without being deleted.
Everything your Tempest reports: temperature (current, min/max, feels-like, 24hr trend), wind (speed, gust, direction with animated compass), barometric pressure (gauge with trend), rainfall (rate and accumulation with animated gauge), lightning (distance and strike counts), a 3-day forecast, a radar panel, aviation conditions (METAR from your nearest airport), and astronomy (sun/moon position, UV index, solar radiation). Live weather alerts from NWS (US) and Environment Canada are also surfaced as a bell icon with count, a pulsing dashboard border, and a full-screen takeover for critical warnings. All updated in real time via WebSocket. (The aviation panel and weather alerts come with Basic and above.)
No. PiConsole is a free, self-hosted Python app that runs on a Raspberry Pi. Halcyon is a hosted web dashboard — no Pi, no Docker, no server. Just open a URL. It's built from the ground up with modern web tech, animated panels, and cloud-synced settings.
Yes, on Basic and Plus. If your WeatherFlow account has multiple stations, Halcyon detects all of them automatically. Switch between stations instantly by tapping the station name in the bottom bar. The clock, forecast, and all panel data update to match whichever station you select. Free shows one station.
Yes — Halcyon is built exclusively for the WeatherFlow Tempest weather station. It connects directly to WeatherFlow's API using your personal access token for real-time data.
Yes. TRMNL is a small e-ink screen for a shelf or wall that redraws itself every few minutes, and Halcyon has two screens for it. Halcyon Weather shows your station's current conditions, the days ahead and any NWS or Environment Canada alert for your station; it comes with Basic and Plus. Station Records puts your all-time records and station patterns on the wall; it comes with Plus. Both are in TRMNL's recipe directory: search its recipes for “Halcyon”, add the screen and paste in your Halcyon license key. The free version doesn't include TRMNL screens.
Most Tempest community projects are hobby tools built by one person in their spare time. Halcyon is actively developed and maintained as a product — hosted infrastructure, automatic updates, cloud-synced settings, and ongoing development all cost money to run. The free tier is the part that costs almost nothing to serve; the paid plans fund the rest.
Connect your Tempest and make your next glance out the window a little more interesting.
Start freeFour live panels. Two screens. No card.
We ran WeatherFlow PiConsole for years and loved it. Halcyon grew from wanting that always-on experience in a browser, on the screens we already owned. It’s built and maintained by DAB Worx Inc., a small shop making tools we use ourselves.