Our native Weather and Tempest Weather Station plugins correlate various conditions (sunny, partly cloudy, etc) to SVG icons.
You are welcome to use these icons for your own weather plugin development.
Icons - all layouts
Prefix the following URLs with https://usetrmnl.com.
/images/plugins/weather/wi-alien.svg
/images/plugins/weather/wi-barometer.svg
/images/plugins/weather/wi-celsius.svg
/images/plugins/weather/wi-cloud-down.svg
/images/plugins/weather/wi-cloud-refresh.svg
/images/plugins/weather/wi-cloud-up.svg
/images/plugins/weather/wi-cloud.svg
/images/plugins/weather/wi-cloudy-gusts.svg
/images/plugins/weather/wi-cloudy-windy.svg
/images/plugins/weather/wi-cloudy.svg
/images/plugins/weather/wi-day-cloudy-gusts.svg
/images/plugins/weather/wi-day-cloudy-high.svg
/images/plugins/weather/wi-day-cloudy-windy.svg
/images/plugins/weather/wi-day-cloudy.svg
/images/plugins/weather/wi-day-fog.svg
/images/plugins/weather/wi-day-hail.svg
/images/plugins/weather/wi-day-haze.svg
/images/plugins/weather/wi-day-light-wind.svg
/images/plugins/weather/wi-day-lightning.svg
/images/plugins/weather/wi-day-rain-mix.svg
/images/plugins/weather/wi-day-rain-wind.svg
/images/plugins/weather/wi-day-rain.svg
/images/plugins/weather/wi-day-showers.svg
/images/plugins/weather/wi-day-sleet-storm.svg
/images/plugins/weather/wi-day-sleet.svg
/images/plugins/weather/wi-day-snow-thunderstorm.svg
/images/plugins/weather/wi-day-snow-wind.svg
/images/plugins/weather/wi-day-snow.svg
/images/plugins/weather/wi-day-sprinkle.svg
/images/plugins/weather/wi-day-storm-showers.svg
/images/plugins/weather/wi-day-sunny-overcast.svg
/images/plugins/weather/wi-day-sunny.svg
/images/plugins/weather/wi-day-thunderstorm.svg
/images/plugins/weather/wi-day-windy.svg
/images/plugins/weather/wi-degrees.svg
/images/plugins/weather/wi-direction-down-left.svg
/images/plugins/weather/wi-direction-down-right.svg
/images/plugins/weather/wi-direction-down.svg
/images/plugins/weather/wi-direction-left.svg
/images/plugins/weather/wi-direction-right.svg
/images/plugins/weather/wi-direction-up-left.svg
/images/plugins/weather/wi-direction-up-right.svg
/images/plugins/weather/wi-direction-up.svg
/images/plugins/weather/wi-dust.svg
/images/plugins/weather/wi-earthquake.svg
/images/plugins/weather/wi-fahrenheit.svg
/images/plugins/weather/wi-fire.svg
/images/plugins/weather/wi-flood.svg
/images/plugins/weather/wi-fog.svg
/images/plugins/weather/wi-gale-warning.svg
/images/plugins/weather/wi-hail.svg
/images/plugins/weather/wi-horizon-alt.svg
/images/plugins/weather/wi-horizon.svg
/images/plugins/weather/wi-hot.svg
/images/plugins/weather/wi-humidity.svg
/images/plugins/weather/wi-hurricane-warning.svg
/images/plugins/weather/wi-hurricane.svg
/images/plugins/weather/wi-lightning.svg
/images/plugins/weather/wi-lunar-eclipse.svg
/images/plugins/weather/wi-meteor.svg
/images/plugins/weather/wi-moon-alt-first-quarter.svg
/images/plugins/weather/wi-moon-alt-full.svg
/images/plugins/weather/wi-moon-alt-new.svg
/images/plugins/weather/wi-moon-alt-third-quarter.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-1.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-2.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-3.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-4.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-5.svg
/images/plugins/weather/wi-moon-alt-waning-crescent-6.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-1.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-2.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-3.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-4.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-5.svg
/images/plugins/weather/wi-moon-alt-waning-gibbous-6.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-1.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-2.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-3.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-4.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-5.svg
/images/plugins/weather/wi-moon-alt-waxing-crescent-6.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-1.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-2.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-3.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-4.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-5.svg
/images/plugins/weather/wi-moon-alt-waxing-gibbous-6.svg
/images/plugins/weather/wi-moon-first-quarter.svg
/images/plugins/weather/wi-moon-full.svg
/images/plugins/weather/wi-moon-new.svg
/images/plugins/weather/wi-moon-third-quarter.svg
/images/plugins/weather/wi-moon-waning-crescent-1.svg
/images/plugins/weather/wi-moon-waning-crescent-2.svg
/images/plugins/weather/wi-moon-waning-crescent-3.svg
/images/plugins/weather/wi-moon-waning-crescent-4.svg
/images/plugins/weather/wi-moon-waning-crescent-5.svg
/images/plugins/weather/wi-moon-waning-crescent-6.svg
/images/plugins/weather/wi-moon-waning-gibbous-1.svg
/images/plugins/weather/wi-moon-waning-gibbous-2.svg
/images/plugins/weather/wi-moon-waning-gibbous-3.svg
/images/plugins/weather/wi-moon-waning-gibbous-4.svg
/images/plugins/weather/wi-moon-waning-gibbous-5.svg
/images/plugins/weather/wi-moon-waning-gibbous-6.svg
/images/plugins/weather/wi-moon-waxing-6.svg
/images/plugins/weather/wi-moon-waxing-crescent-1.svg
/images/plugins/weather/wi-moon-waxing-crescent-2.svg
/images/plugins/weather/wi-moon-waxing-crescent-3.svg
/images/plugins/weather/wi-moon-waxing-crescent-4.svg
/images/plugins/weather/wi-moon-waxing-crescent-5.svg
/images/plugins/weather/wi-moon-waxing-gibbous-1.svg
/images/plugins/weather/wi-moon-waxing-gibbous-2.svg
/images/plugins/weather/wi-moon-waxing-gibbous-3.svg
/images/plugins/weather/wi-moon-waxing-gibbous-4.svg
/images/plugins/weather/wi-moon-waxing-gibbous-5.svg
/images/plugins/weather/wi-moon-waxing-gibbous-6.svg
/images/plugins/weather/wi-moonrise.svg
/images/plugins/weather/wi-moonset.svg
/images/plugins/weather/wi-na.svg
/images/plugins/weather/wi-night-alt-cloudy-gusts.svg
/images/plugins/weather/wi-night-alt-cloudy-high.svg
/images/plugins/weather/wi-night-alt-cloudy-windy.svg
/images/plugins/weather/wi-night-alt-cloudy.svg
/images/plugins/weather/wi-night-alt-hail.svg
/images/plugins/weather/wi-night-alt-lightning.svg
/images/plugins/weather/wi-night-alt-partly-cloudy.svg
/images/plugins/weather/wi-night-alt-rain-mix.svg
/images/plugins/weather/wi-night-alt-rain-wind.svg
/images/plugins/weather/wi-night-alt-rain.svg
/images/plugins/weather/wi-night-alt-showers.svg
/images/plugins/weather/wi-night-alt-sleet-storm.svg
/images/plugins/weather/wi-night-alt-sleet.svg
/images/plugins/weather/wi-night-alt-snow-thunderstorm.svg
/images/plugins/weather/wi-night-alt-snow-wind.svg
/images/plugins/weather/wi-night-alt-snow.svg
/images/plugins/weather/wi-night-alt-sprinkle.svg
/images/plugins/weather/wi-night-alt-storm-showers.svg
/images/plugins/weather/wi-night-alt-thunderstorm.svg
/images/plugins/weather/wi-night-clear.svg
/images/plugins/weather/wi-night-cloudy-gusts.svg
/images/plugins/weather/wi-night-cloudy-high.svg
/images/plugins/weather/wi-night-cloudy-windy.svg
/images/plugins/weather/wi-night-cloudy.svg
/images/plugins/weather/wi-night-fog.svg
/images/plugins/weather/wi-night-hail.svg
/images/plugins/weather/wi-night-lightning.svg
/images/plugins/weather/wi-night-partly-cloudy.svg
/images/plugins/weather/wi-night-rain-mix.svg
/images/plugins/weather/wi-night-rain-wind.svg
/images/plugins/weather/wi-night-rain.svg
/images/plugins/weather/wi-night-showers.svg
/images/plugins/weather/wi-night-sleet-storm.svg
/images/plugins/weather/wi-night-sleet.svg
/images/plugins/weather/wi-night-snow-thunderstorm.svg
/images/plugins/weather/wi-night-snow-wind.svg
/images/plugins/weather/wi-night-snow.svg
/images/plugins/weather/wi-night-sprinkle.svg
/images/plugins/weather/wi-night-storm-showers.svg
/images/plugins/weather/wi-night-thunderstorm.svg
/images/plugins/weather/wi-rain-mix.svg
/images/plugins/weather/wi-rain-wind.svg
/images/plugins/weather/wi-rain.svg
/images/plugins/weather/wi-raindrop.svg
/images/plugins/weather/wi-raindrops.svg
/images/plugins/weather/wi-refresh-alt.svg
/images/plugins/weather/wi-refresh.svg
/images/plugins/weather/wi-sandstorm.svg
/images/plugins/weather/wi-showers.svg
/images/plugins/weather/wi-sleet.svg
/images/plugins/weather/wi-small-craft-advisory.svg
/images/plugins/weather/wi-smog.svg
/images/plugins/weather/wi-smoke.svg
/images/plugins/weather/wi-snow-wind.svg
/images/plugins/weather/wi-snow.svg
/images/plugins/weather/wi-snowflake-cold.svg
/images/plugins/weather/wi-solar-eclipse.svg
/images/plugins/weather/wi-sprinkle.svg
/images/plugins/weather/wi-stars.svg
/images/plugins/weather/wi-storm-showers.svg
/images/plugins/weather/wi-storm-warning.svg
/images/plugins/weather/wi-strong-wind.svg
/images/plugins/weather/wi-sunrise.svg
/images/plugins/weather/wi-sunset.svg
/images/plugins/weather/wi-thermometer-exterior.svg
/images/plugins/weather/wi-thermometer-internal.svg
/images/plugins/weather/wi-thermometer.svg
/images/plugins/weather/wi-thunderstorm.svg
/images/plugins/weather/wi-time-1.svg
/images/plugins/weather/wi-time-10.svg
/images/plugins/weather/wi-time-11.svg
/images/plugins/weather/wi-time-12.svg
/images/plugins/weather/wi-time-2.svg
/images/plugins/weather/wi-time-3.svg
/images/plugins/weather/wi-time-4.svg
/images/plugins/weather/wi-time-5.svg
/images/plugins/weather/wi-time-6.svg
/images/plugins/weather/wi-time-7.svg
/images/plugins/weather/wi-time-8.svg
/images/plugins/weather/wi-time-9.svg
/images/plugins/weather/wi-tornado.svg
/images/plugins/weather/wi-train.svg
/images/plugins/weather/wi-tsunami.svg
/images/plugins/weather/wi-umbrella.svg
/images/plugins/weather/wi-volcano.svg
/images/plugins/weather/wi-wind-beaufort-0.svg
/images/plugins/weather/wi-wind-beaufort-1.svg
/images/plugins/weather/wi-wind-beaufort-10.svg
/images/plugins/weather/wi-wind-beaufort-11.svg
/images/plugins/weather/wi-wind-beaufort-12.svg
/images/plugins/weather/wi-wind-beaufort-2.svg
/images/plugins/weather/wi-wind-beaufort-3.svg
/images/plugins/weather/wi-wind-beaufort-4.svg
/images/plugins/weather/wi-wind-beaufort-5.svg
/images/plugins/weather/wi-wind-beaufort-6.svg
/images/plugins/weather/wi-wind-beaufort-7.svg
/images/plugins/weather/wi-wind-beaufort-8.svg
/images/plugins/weather/wi-wind-beaufort-9.svg
/images/plugins/weather/wi-wind-deg.svg
/images/plugins/weather/wi-windy.svg
Icons - specific layouts
Icon options below are resized to fit better in a given layout. As above, prefix these URLs with https://usetrmnl.com.
/images/plugins/weather/full/cloudy-gusts.svg
/images/plugins/weather/full/showers.svg
/images/plugins/weather/full/snow.svg
/images/plugins/weather/full/sunny.svg
/images/plugins/weather/full/windy.svg
/images/plugins/weather/half_horizontal/cloudy-gusts.svg
/images/plugins/weather/half_horizontal/showers.svg
/images/plugins/weather/half_horizontal/snow.svg
/images/plugins/weather/half_horizontal/sunny.svg
/images/plugins/weather/half_horizontal/windy.svg
/images/plugins/weather/half_vertical/cloudy-gusts.svg
/images/plugins/weather/half_vertical/showers.svg
/images/plugins/weather/half_vertical/snow.svg
/images/plugins/weather/half_vertical/sunny.svg
/images/plugins/weather/half_vertical/windy.svg
/images/plugins/weather/quadrant/cloudy-gusts.svg
/images/plugins/weather/quadrant/showers.svg
/images/plugins/weather/quadrant/snow.svg
/images/plugins/weather/quadrant/sunny.svg
/images/plugins/weather/quadrant/windy.svg