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Live weather, and what rain can do

Yardstick can show the current conditions right on your wall display, and the same rainfall can close a no-go zone after rain, hold your scheduled programs until the grass has dried, and send the leaf blower home when rain starts. Pick where the weather comes from: your own station (a Tempest, or any station that reports to Weather Underground), the National Weather Service, or MET Norway. The two public services need no account and nothing to sign up for.

Where it lives: Settings → Weather Off until you pick a source. Set Source to Off to turn it back off.
One source at a time Choose one in Source. You can switch freely in either direction, and nothing else needs changing when you do. If your station breaks, switch to a public source and switch back when the replacement arrives. Your Station ID and token or key are kept while you are away.

Which source to choose

Tempest
Reads your own WeatherFlow Tempest. It measures what actually fell on your grass, which nothing else here can do, so it is the best source if you have one. Needs a Station ID and an Access token.
Weather Underground
Reads your own station if it reports to Weather Underground: Ambient, Ecowitt, Davis and most others. Like a Tempest, it measures your own lawn. Needs your station's ID and the free API key Weather Underground gives station owners. Read every five minutes.
National Weather Service
United States only. Conditions come from the nearest reporting station, and rainfall from NOAA's radar, which measures a patch about two thirds of a mile across over your property. No account, no key.
MET Norway
Works anywhere in the world, also with no account. It is a forecast model rather than a measurement, so rainfall is what was expected rather than what was caught in a gauge.
The public sources find your yard from the robot The National Weather Service and MET Norway are asked for the weather at your yard's location, which Yardstick knows from where your robot has been. A brand new install shows nothing from them until the robot has reported its position. Your own station does not need this.

What it shows

Once it is set up, the wall display shows the live conditions and keeps them fresh. The values you see:

Temperature
The current air temperature, plus a feels-like reading.
Humidity
The relative humidity in the air right now.
Wind
Average wind speed, the latest gust, and the wind direction.
Pressure
The current barometric pressure.
Sun
UV index and solar radiation from a Tempest or Weather Underground, when the station measures them. MET Norway gives a UV index only, and the National Weather Service gives neither.
Rain
How much rain has fallen so far today.
A stale reading means the source has gone quiet A Tempest reports about once a minute, so a reading more than 5 minutes old is flagged stale: the station is offline or asleep. A Weather Underground station is flagged after 20 minutes, since it is read every five. The public services update about once an hour, so they are only flagged stale after an hour and a half. Either way, the flag clears on its own when a fresh reading arrives.

What rain can do

The rainfall from your source can drive three things. Each one is off until you set it up.

Close a no-go zone
A weather rule closes the zones you pick once enough rain has fallen, and reopens them a set number of hours after the rain. See Closing a zone after rain.
Hold your programs
The same weather rule can keep your scheduled programs on the dock until the grass has had time to dry, including a job waiting to go back out after quiet hours or a charging break. See Rainy days in the Scheduler.
Send the leaf blower home
When your own station reports rain, a robot out with the leaf blower is sent back to its dock. Below.

Send the leaf blower home when rain starts

The leaf blower has no rain sensor of its own, so once it is out, nothing else tells it to come in. Turn on Send the leaf blower home when rain starts in Settings → Weather, and when your own station reports rain, a robot out with the leaf blower is sent back to its dock and the job is ended.

  1. It waits for a second reading

    One wet reading is not enough. It waits for a second, newer reading that also shows rain, so a stray drop or a sprinkler catching the station once does not set it off.

  2. The robot is sent home

    A Tempest reports every minute, so the robot is on its way home a minute or two after the rain starts. Weather Underground is a few minutes behind, roughly 2 to 10, depending on how often your station uploads.

  3. The rest of the program is canceled

    If the robot was running one of your programs, the rest of that program is canceled and it runs again at its next scheduled time. A job you started yourself is simply ended.

  4. You are told

    You get an alert when it happens, and another if your station stops reporting while the blower is out, so a quiet station is never taken to mean dry weather.

Your own station only, and the leaf blower only It needs a Tempest or your own station on Weather Underground. The National Weather Service and MET Norway cannot be used for this: they are a forecast or a radar estimate for your area, not a measurement of rain on your lawn. The mower keeps using Yarbo's own Rain Detection, set in the Yarbo app, and the snow blower is meant to be out in bad weather.

Setting it up

Open Settings → Weather and pick a Source. The two public services need nothing more. A Tempest needs its Station ID and a personal Access token from your account at tempestwx.com. Weather Underground needs your station's Station ID and an API key from wunderground.com. Those fields only appear when their source is picked.

  1. Pick a Source

    Choose Tempest, Weather Underground, National Weather Service or MET Norway. Using a public source? Skip to choosing your units.

  2. Tempest only: find your Station ID

    Sign in at tempestwx.com and open your station. The Station ID is in its settings, and in the web address as the number right after /station/. It is digits only.

  3. Tempest only: create an Access token

    Use Get a token in Settings, or go to tempestwx.com/settings/tokens, and sign in with the same account as your Tempest. Under Personal Use Tokens click Create Token, give it any name, and paste the string it shows into Access token.

  4. Weather Underground only: find your Station ID

    Sign in at wunderground.com and open My Devices. The Station ID is letters and numbers, such as KWIPLOVE12.

  5. Weather Underground only: get an API key

    Use Get a key in Settings, or go to wunderground.com/member/api-keys, and sign in with the same account as your station. If no key is listed, click Generate New Key. Copy it into API key. Weather Underground only gives keys to accounts with a station that is uploading.

  6. Choose your units

    Pick Fahrenheit (°F, mph, in) or Celsius (°C, km/h, mm). This only changes how the numbers are displayed.

  7. Leaf blower in the rain (optional)

    With your own station picked, turn on Send the leaf blower home when rain starts if you want it. With a public source the switch is grayed out.

  8. Test, then Save

    Press Test source to pull a reading and see it on the spot. When it looks right, press Save. It appears on the wall within a minute.

The Weather settings panel with a Source picker set to Tempest, a Station ID field, an Access token field, a Units choice, and Test source and Save buttons.
Settings → Weather with Tempest picked. With Weather Underground picked you see its Station ID and API key instead; with a public source picked, those fields go away.

Good to know

Rain can close a no-go zone and hold your programs Whichever source you pick also supplies the rainfall that weather rules follow, closing a zone after rain, holding your programs, and opening things back up once the grass has had time to dry. See Closing a zone after rain and Rainy days in the Scheduler.
Which weather sources work?

A WeatherFlow Tempest station of your own, any station of your own that reports to Weather Underground (Ambient, Ecowitt, Davis and most others), the National Weather Service (United States only), or MET Norway (anywhere in the world). No other services are supported.

Why can't the leaf blower use the National Weather Service?

Sending a robot home is acting on its own, so it only does it on a measurement of rain on your lawn. The National Weather Service gives a radar estimate for an area around you, and MET Norway a forecast; either can say rain when your grass is dry, or miss a shower that is soaking it. Weather rules can still use them, because those only decide whether to start.

How do I turn weather off?

Set Source to Off and press Save. Nothing shows on the wall display, and nothing is fetched.

Test source says "No reading". What now?

With Tempest, check the Station ID and token, and that the station is online. With Weather Underground, check the Station ID and API key, and that the station is uploading. With a public source, the service did not answer; try again in a minute. If the National Weather Service never answers, your yard may be outside the United States; use MET Norway instead.

The conditions say "stale". What does that mean?

The newest reading is older than it should be: more than 5 minutes for a Tempest, 20 minutes for Weather Underground, or an hour and a half for a public service. For your own station, check that it has power and is connected. Once a fresh reading arrives, the stale flag clears by itself.

Does this send my data anywhere?

Not to Yardstick. A Tempest is read with your own read-only token, which cannot change anything on your station, and Weather Underground with your own API key. The public services are asked for the weather at your yard's location, and that is all they are sent.

Yardstick is an independent tool for Yarbo robots. Not affiliated with or endorsed by Yarbo Inc. · © 2026 Yardstick Technologies LLC.