Siri Change Weather Temperature from Fahrenheit to Celsius
Yes, you can change Siri’s weather temperature from Fahrenheit to Celsius. The setting is not inside Siri itself but in the Weather app or the system region settings on your iPhone or iPad. Once you change it there, Siri will report temperatures in Celsius for all weather queries.
Where the Temperature Unit Is Set
Siri reads weather data from the built-in Weather app, which follows the temperature unit you choose in the app’s settings or the device’s region format. There is no separate “Siri temperature unit� toggle. If you ask Siri for the weather and it still says Fahrenheit after you changed the Weather app, the device’s region or language settings may be overriding your choice.
How to Change It on iPhone and iPad
- Open the Weather app on your iPhone or iPad.
- Tap the list icon (three horizontal lines) in the bottom-right corner.
- Tap the circle icon with “C/F� in the top-right corner of that list view. It toggles between Celsius and Fahrenheit.
- Close the Weather app and ask Siri “What’s the weather today?� – Siri should now use the unit you selected.
If you don’t see the C/F toggle, make sure the Weather app is up to date and that you are viewing the forecast list, not a single location’s details. On some older iOS versions, the toggle is inside the location’s detailed view.
Changing Region Settings as an Alternative
If the Weather app toggle doesn’t stick, you can force the unit by changing your device’s region format. Go to Settings → General → Language & Region. Under “Temperature Unit,� choose Celsius. This overrides the Weather app’s default for all system services, including Siri. Note that this also changes how dates, times, and other regional formats appear, so you may want to keep the region as your country but only change the temperature unit if the option is available.
Why Siri Might Still Say Fahrenheit
There are a few common reasons Siri continues to report Fahrenheit even after you change the Weather app:
- Weather app cache: Force-quit the Weather app and Siri by swiping them away in the app switcher, then try again.
- Region mismatch: If your device region is set to a country that uses Fahrenheit (like the United States), Siri may default to Fahrenheit unless you explicitly change the temperature unit in Language & Region.
- Spoken language: Some users report that Siri’s language (e.g., English US) can influence units. Changing the Siri language to English UK or English Australia may make Celsius the default.
- iOS version: Very old iOS versions may not have the C/F toggle in the Weather app. Updating to the latest iOS usually fixes this.
How to Check Which Unit Siri Is Using
Ask Siri “What temperature is it outside?� If Siri says “72 degrees� without a letter, it’s Fahrenheit. If it says “22 degrees Celsius,� it’s Celsius. To be sure, ask “Is that Fahrenheit or Celsius?� Siri will usually clarify. You can also look at the Weather app’s main screen – the unit is shown next to the temperature number.
Changing Units on Other Apple Devices
The same settings apply to iPod touch and iPad. On the Apple Watch, the temperature unit follows the iPhone’s Weather app setting. If you change it on the iPhone, the watch will update automatically. On a Mac, the Weather app (in macOS Ventura or later) also has a C/F toggle in its settings, and Siri on the Mac uses that same setting.
Frequently Asked Questions
Does changing the Weather app affect Siri’s answers?
Yes. Siri pulls weather data from the Weather app, so the unit you select there is what Siri uses. If you change the Weather app to Celsius, Siri will respond in Celsius for all weather queries.
Why does Siri say “72 degrees� without a unit?
Siri often omits the unit when it thinks the context is clear. If you’re in a region that uses Fahrenheit, it assumes you know it’s Fahrenheit. You can ask “in Celsius� as a follow-up, and Siri will convert it for that one query.
Can I set Siri to always use Celsius without changing the Weather app?
No. There is no Siri-specific temperature unit setting. You must change the unit in the Weather app or in the system region settings. The only exception is a one-time conversion request like “What’s 72°F in Celsius?�
Will changing the region to a Celsius country affect other things?
Yes. Changing the region changes date formats, number formats, and possibly the first day of the week. If you only want to change the temperature unit, look for the “Temperature Unit� option in Language & Region – it’s available in iOS 15 and later. That changes only temperature, not other regional formats.
Does Siri on HomePod or CarPlay use the same setting?
Yes. HomePod and CarPlay Siri use the temperature unit from the paired iPhone’s Weather app. Change it on the iPhone, and those devices will follow.
What if the C/F toggle is missing in the Weather app?
If you don’t see the toggle, make sure the Weather app is updated. On iOS 14 and earlier, the toggle may be inside the three-dot menu in the bottom-right corner. If it’s still missing, restart your iPhone or check that the app isn’t restricted by Screen Time settings.
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