Japan is bracing for notable weather fluctuations as it transitions from February to March 2025, with rapid changes expected across the country. According to the Japan Meteorological Agency (JMA), the two-week forecast indicates significant temperature variations, starting with warmer conditions over the next few days before colder air masses sweep through.
For northern regions, including Hokkaido and parts of Honshu, the warmer air is anticipated for the next three days, bringing milder temperatures, with chances of reaching markedly high levels. Current forecasts suggest temperatures hitting 10 degrees Celsius for the first time this year on parts of Hokkaido, including Sapporo, where the temperature could reach 11 degrees, akin to mid-April averages.
"The southern high pressures combined with lower systems to the north create conditions conducive for warm air to sweep through, especially affecting the Kanto and western regions," the JMA explained. This trend is expected to lead to unseasonably warm weather, as temperatures are projected to soar to 20 degrees Celsius over the weekend of March 1-2, particularly in urban centers like Tokyo and Fukuoka.
Despite the initial warmth, forecasts caution against complacency. From March 2 onward, the weather is expected to shift dramatically as fronts and low-pressure systems approach, leading to rain and, potentially, snow across wide areas, including inland regions of Kanto.
"We might see snow where we typically wouldn’t this early, which is unusual for this period," noted meteorologists, referencing the potential for what is termed 'nanamame-zuyu' (rape blossom rain). This refers to the rain spells expected during early spring, typically occurring later in the month.
Over the upcoming week, from March 2 to March 6, Japan will face rainy or snowy conditions due to the stalling front, leading to significant precipitation, especially for the Chubu and northern regions. This could result in increased melting of accumulated snow, heightening safety concerns around avalanches and floods.
According to the JMA's latest month-long forecast, higher pressures from northern Asia are not expected to persist for long, indicating the likelihood for continued variations—initial warm temperatures might yield to more winter-like conditions swiftly.
For agriculture and residents, managing crops and preparing for possible adverse conditions is highly recommended, especially as rapid environmental changes can lead to increased risks for crop damage and natural disasters during the transition periods.
The JMA also highlighted the increased pollen counts accompanying the warmer temperatures. With higher temperatures expected as early as March, rapid growth and dispersal of cedar pollen will likely peak during the beginning of March, leading to prompts for residents to safeguard themselves against allergies.
"Expect 'very heavy' pollen counts as we approach the weekend," associated health experts indicated. Residents are advised to wear masks and take precautionary measures against allergy symptoms.
The JMA urges everyone to stay informed on weather developments over the next few weeks, particularly as conditions are expected to change from one extreme to another quite rapidly. Those planning activities outdoors should prepare for the unpredictable March weather, with both warm sunny intervals and potential wintry conditions expected to occur on the same days.
Overall, Japan's weather forecast for March signals both excitement and caution as citizens prepare for the variable spring conditions typical of this time of year.