The astronomical spring is set to commence on March 20 at 15:46 Central European Time, coinciding with the spring equinox. At this time, the sun will cross the equator, signaling the start of its journey northward. This event traditionally marks a moment when day and night are approximately equal in length, a significant marker in the seasonal cycle of the year. The longest day of the year will occur at the summer solstice on June 21, when daylight will be twice as long as the night.

Meteorologists predict that the onset of this astronomical spring will be met with predominantly cloudy weather across the country, although early in the southern half of Czechia there may be some clear skies. Nighttime temperatures are expected to hover around freezing, but daytime highs will likely reach between 9 and 14 degrees Celsius. Rainfall will be rare, though some snow could fall in higher elevations exceeding 900 meters. The weather patterns are expected to persist in a similar fashion in the following days.

Typically, the spring equinox falls on March 20, though historically, it has often been March 21. The last occurrence was in 2011, and it will next occur in 2102. Rarely, spring can commence as early as March 19, a phenomenon last seen in 1796 and projected to happen again in 2048. Towards the end of the century, there are predictions for more instances of spring commencing on this day, reflecting changes in the Earth's orbit and the calendar system.