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Relative humidity changes with temperature through the day, so 90% on a cool morning can feel fine while 50% on a hot afternoon feels sticky. Dew point measures how much moisture is actually in the air, which is what decides how muggy it feels.
Live readings are averaged from nearby U.S. National Weather Service stations. Forecasts come from meteoblue, UV from currentuvindex.com, pollen from Google, radar from RainViewer and maps from Esri. The full list is in the privacy policy.
Tap the location arrow to use where you are now, or search for a place by name. If the arrow does nothing, location access may be off: open Settings → Privacy & Security → Location Services → Muggy Meter and choose “While Using the App”.
Turn on Muggy alerts in the comfort-line card. The app schedules a heads-up about an hour before the dew point is forecast to reach your comfort line, plus a 7 am summary, for the next two days. Alerts use the forecast from the last time you opened the app, so open it now and then to keep them fresh. If they never arrive, check Settings → Notifications → Muggy Meter.
Your last reading, with how long ago it was taken. Pull down to refresh once you are back online.
Subscriptions are handled by Apple. On your iPhone, open Settings → your name → Subscriptions.
Muggy Meter is comfort information, not medical or safety advice. In extreme heat, follow guidance from the National Weather Service and your local authorities.