Show the Chance of Rain in the Mac Menu Bar

What you need

Find your latitude and longitude. Open-Meteo’s place search gives them for any town (the first result’s latitude and longitude):
Terminal
```
curl -s 'https://geocoding-api.open-meteo.com/v1/search?name=Plano&count=1'
```
Add a Web Address meter with this address and the key path hourly.precipitation_probability.0 (the first hour from now):
Web address
```
https://api.open-meteo.com/v1/forecast?latitude=33.02&longitude=-96.70&hourly=precipitation_probability&forecast_hours=1
```
Range 0 to 100, unit %, alerts on High values at 40 and 70.

In Customize This Meter… (from the meter’s menu):

Settings for this meter
Setting	Value
Source	Web Address
Web address	`https://api.open-meteo.com/v1/forecast?latitude=LAT&longitude=LON&hourly=precipitation_probability&forecast_hours=1`
Key path	`hourly.precipitation_probability.0`
Refresh every	15 minutes
Range	0 to 100
Unit	`%`
Alerts	High values: warning 40, critical 70
Label	`RAIN`
Face	Pie, Pill or Heat Strip

Tested: Run on October 29, 2026 for Plano, Texas: 1%.

More on this source, including every format it reads, in the Web Address guide.

Open-Meteo allows up to 10,000 calls a day for non-commercial use without a key; one meter every 15 minutes uses 96. Its models update about every hour.

Set forecast_hours=3 and use a Script meter: curl -s URL | jq '.hourly.precipitation_probability | max'.

current=precipitation, key path current.precipitation.

What the meter says, why, and what to do
Symptom	Cause	Fix
No number found in the response	The key path doesn’t match the reply.	Run `curl -s` with the address and read the JSON. Dots walk into objects, numbers pick array items (`items.0.count`).
Couldn’t reach the address	No network, a typo in the host, or the service is down.	Open the address in your browser. Multimeter tries again at the next refresh.

Why the hourly probability and not a current one?

Rain chance is a forecast, so it’s given per hour. The first hour in the list is the one starting now.