- SA Fires
- SAAQIS
- Sacramento Region Air Quality
- SAFAR-Air
- Safe Sky - Airside Sync
- Safety tips
- Tourist Care Uttarakhand
- Saga Explorer
- Sail Bristol
- SailFlow: Marine Forecasts
- Sailmate
- Sailspots
- SailTimer API™
- Salcombe App
- SaltWx
- Salty Solutions
- San Diego Airport + Tracker
- Santa Fe Psychrometric Calculator
- SaskAlert
- Sataa
- Satark
- SatSquatch
- SatVis
- SCNow Florence Morning News
- Scope Nights Astronomy Weather
- Scottsbluff Star-Herald
- ScreenShot-Webpage Snapshoot
- Scuttlebutt App
- SDVFR
- Sea Level Rise
- Sea Status
- Sea Weather Professional
- Sea Weather Professional TV
- Seabreeze.com.au
- Seaside Buoy
- Seasonality Core
- Seasonality Go
- Seasonality TV
- Seasons App
- Seaweather
- Seewetterbericht
- Seismic Watch
- Seismo
- Seismos: Earthquake Monitoring
- Sejladsudsigt
- Semios
- Sencor Meter
- Sensimote
- Sensio Air: Allergy Tracker
- SensorBlue
- Sensorr
- Seqwater
- WWMT Weather Alert Network
- Severe Weather from NOAA/NWS
- SevereWXWarn Weather Pro
- Sferic Connect
- SevereWXWarn Weather Pro
- Sferic Connect
- Sferic Mobile
- SG Air
- SG Real PSI: Haze PSI
- SG Weather
- ShakeNet
- ShanghaiAir
- ShareLah
- Shine Your Weather
- ShipsClock
- Shoobie³ Tide Table
- Shorts or Pants?
- Shorts Weather
- Shralp Tide 2
- SIATA
- SiderealAirMass
- Sidillu
- Sigmet Decode
- SigmetViewer
- Sign&Glide
- SIGNALERT App
- SimClimat
- Simple and Colorful Weather
- Simple Forecast
- Simple Local Weather
- Simple Moon Phase Calendar