Hygrometer
What each size shows
| Size | Shows | Best for |
|---|---|---|
| Small | The dial, the percentage, and the short band name | A glance among other widgets |
| Medium | Dial and percentage, plus dew point and water content | The useful default |
| Large | All of the above, plus the comfort scale and the condensation margin | A dedicated weather page |
| Lock Screen | Percentage inline, or a circular dial gauge | Seeing it without unlocking |
| StandBy | The dial at a distance, legible across a room | A charging phone on a bedside table |
The design principle is that the small widget answers "is it humid" and the large one answers "what should I expect" — so the extra space carries the dew point and the condensation threshold rather than more decoration.
Why a widget rather than an app
Humidity is a glance, not a session. You want to know whether the washing will dry, whether the evening will feel close, or whether the windscreen will be running in the morning — and then get on with your day.
That is also why the dew point is on the larger widgets. It barely changes through the day, so one glance in the morning is genuinely the whole story, in a way a temperature reading never is.
What Apple's own widget leaves out
The stock Weather widget shows conditions, temperature and a forecast. Humidity is in the app, several taps into the detail view, and it is a bare percentage — no dew point, no water content, no context for what the number means.
That gap is small but real, and it is most of the reason this app exists.
Adding one
Long-press the Home Screen, tap the + in the corner, search for the app, choose a size and place it. For the Lock Screen, long-press the lock screen, tap Customise, and pick a widget slot.
Widgets refresh on a schedule iOS controls — typically every 15 to 60 minutes, adjusted for how often you actually look and how much battery is left. For humidity this is more than adequate.
What it is reporting
Outdoor conditions at your location, from Apple Weather. It is not measuring the room you are in, because no iPhone has a humidity sensor — and the app says so rather than implying otherwise.
For outdoor questions, that is exactly the right reading. For indoor ones you need an instrument in the room, and no widget can substitute.