Abnormal weather: forecast for September 2025 published
September 2025 in Russia will be changeable: in Moscow at the beginning of the month it is expected to be warm up to 26 degrees and about 10 rainy days, in St. Petersburg the weather is close to normal with variable clouds. Local storms and frosts are possible, and Indian summer will occur in the second half of the month. September in Russia will be a great time to pick berries and mushrooms. About the weather for the first month of autumn 2025, folk signs and atmospheric pressure — in the material of Izvestia.
Weather for the month of September 2025 in Moscow
September 2025 in Moscow promises to be changeable and quite abnormal compared to the usual climate of this time of year. The beginning of autumn in the capital will be warm: the average daytime temperature will be about +18...+20 degrees, while some days in the first week may reach a maximum of 26 degrees Celsius, which is higher than normal.
Nighttime temperatures are expected in the range of +7...+10 degrees, which indicates a shift of the classical heat to a later time of the year. Meteorologists predict about 10-12 rainy days, which may compensate for the dry summer. Total precipitation in September is expected to reach 50-60 mm.
The weather will vary from cool and humid days at the beginning and middle of the month to warm and dry towards the end of the month.
Weather forecast for September 1, Knowledge Day, in Moscow
The first day of autumn, which is traditionally celebrated in Russia as Knowledge Day, will be warm and comfortable in Moscow for walking and outdoor celebrations. The daytime air temperature is expected to be around 20 degrees Celsius, with no precipitation.
The sky will be mostly cloudy, but this will not prevent celebrations from taking place in schools and universities on September 1. Nighttime temperatures will remain around +10 degrees, which will create pleasant conditions for evening walks.
What will the weather be like in September in St. Petersburg
No anomalies are expected in St. Petersburg in September. During this period, the weather will be close to the climatic norm.
The average daytime temperature will range from +13-17 degrees, and the nighttime temperature will range from +5 to +9 degrees. On some days, fluctuations from night frosts to -2 degrees and a short-term increase to 25 degrees Celsius are possible.
More precipitation is expected: approximately six rainy days with a total precipitation of about 70-80 mm. Increased humidity will make the air less comfortable on cloudy days, but warm moments will allow you to admire the city in delicate autumn colors.
Weather anomalies and natural disasters in September 2025
According to forecasters, September 2025 may bring several abnormal weather events. There is a possibility of local storms and strong winds, especially in the northern and central regions of Russia.
Forecasters note the possibility of unexpected frosts at the end of the month, which may affect agriculture.
It is noteworthy that there is a trend towards an increase in the number of extreme weather events worldwide, and Russia is no exception. Experts advise to be prepared for sudden changes in temperature and precipitation.
Will there be Indian summer in September 2025
Despite the anomalies, meteorologists predict a classic Indian summer from mid to late September. Warm, sunny days with temperatures up to +22...+25 degrees are expected, which will allow you to enjoy the last warm days before the real autumn. This time is usually characterized by clear weather and light winds, creating ideal conditions for walking and harvesting.
In the European part of the country, including Moscow, September is expected to remain warm and pleasant, mainly in the second half of the month. The air temperature in the capital can reach +22...+25 degrees, which will create conditions for comfortable walks, outdoor activities and the completion of gardening. At the same time, night temperatures will begin to drop gradually, emphasizing the change of seasons, but no sharp cold snaps are expected yet.
Indian summer is also possible in St. Petersburg in September, but it will be shorter than in Moscow. Here, the average daily temperatures will be around +16...+20 degrees, with thaws accompanied by variable clouds. On some days, a short-term temperature increase to +22-25 degrees is possible, however, night frosts at the end of the month may occur a little earlier than in the central regions.
Indian summer will traditionally manifest itself in the central and northern parts of the country. It will be a short but warm period when the autumn weather softens and a comfortable temperature is established. In the southern regions, Indian summers are usually more stable and prolonged, with warm days and moderate rainfall.
Indian summer is expected to be short and short in the northwestern part of Russia, with a predominance of humid and cloudy weather and daytime highs of about 12 degrees Celsius.
What useful berries and herbs are harvested in September in Russia
September is a rich month for picking healthy berries and medicinal herbs. For lovers of a healthy lifestyle and preparations for the winter, this is the ideal month to replenish their reserves of vitamins and nutrients. Collecting the autumn gifts of nature is not only a useful activity, but also an opportunity to spend time outdoors, enjoying the last warm days of September.
In the first month of autumn, ripe cranberries are actively harvested in forests and swamps — red juicy berries rich in vitamin C that help strengthen the immune system and improve metabolism; cranberries are a folk remedy for preventing colds and supporting the urinary system; blueberries and blueberries, mountain ash and rosehip — their fruits contain a large amount of vitamins, including infusions and teas are prepared to strengthen the immune system. Berries are especially appreciated after the first light frosts, as they become sweeter and lose their bitterness.
During the same period, herbs such as St. John's wort, mint, lemon balm and thyme are harvested. Experts recommend picking berries and herbs in dry weather to preserve vitamins, drying herbs in the shade or in ventilated rooms, and berries such as rosehip and mountain ash become especially tasty after the first frost.
Which mushrooms are harvested in Russia in September
The mushroom season reaches its peak in September. Porcini mushrooms, horseradish, redheads and champignons are massively harvested in the forests of Russia.
This time is considered the best time for mushroom pickers, because in September the humidity and temperature conditions are ideal for mushroom growth. However, due to changes in weather conditions, the season may shift slightly, so it is important to closely monitor local climate changes.
Among the most popular mushrooms of this season is the porcini mushroom, or boletus, with dense flesh and excellent taste, which grows in coniferous and mixed forests. Podberezoviki are harvested under birch trees, and podosinoviki — under aspens; both mushrooms are good for frying, marinating and drying. In coniferous forests, there are oil pans that require heat treatment, and honey mushrooms appear on stumps and fallen trees, growing in large groups and excellent for frying and pickling. Redheads continue to delight in pine forests, and coniferous and mixed forests are dotted with chanterelles with a characteristic aroma and taste.
Experienced mushroom pickers advise picking mushrooms after the rains, when they are fresh and juicy. For safety, it is recommended to use a basket instead of a plastic bag — this is how the mushrooms "breathe" and do not mold.
Folk weather signs for September
September is traditionally filled with folk signs that help predict the weather for autumn and the coming winter.
For example, a warm September usually heralds an early winter with light snow, while a cold one heralds a mild and lingering autumn. The wind direction also played a role: the wind from the south and east promises a warm autumn, and from the north and west — cold and rainy. Fog in the mornings at the beginning of the month was considered a harbinger of clear weather, and if the fog lasted a long time, rains would soon follow.
It was believed that if there were a lot of fogs in September, you should expect a good autumn and harvest. Bright sun on the first day of the month leads to a warm and dry autumn. If the leaves start to turn yellow and fall off quickly during the first days of September, it means that autumn will be early and cold.
There are also signs for specific days: sunny September 1 promises a warm and fruitful autumn, the flight of cranes high and united indicates dry weather, low — about wet. The date of September 8, the feast of the Beheading of John the Baptist, was considered significant: the rain on this day foreshadowed a wet September. On the Exaltation of the Cross, September 14, a clear day promises a cold but sunny autumn, while a cloudy day promises a warm and humid one. On September 21, the color of the leaves predicted the beginning of winter: if the leaves turn yellow early, winter will come early, if they remain green— autumn will be long.
Signs were also observed in the behavior of plants and animals. The early fall of acorns spoke of a cold winter coming, and the red and abundant mountain ash — of snowstorms and frosts. The gathering of swallows and cranes marked the beginning of the cold weather, and the noise in the forest from squirrels foreshadowed a snowy winter.
Atmospheric pressure in September: what to expect for weather-sensitive
Atmospheric pressure will fluctuate in September, which, combined with magnetic storms, can affect well-being. The first month of autumn will bring moderate but noticeable pressure changes for weather-sensitive people.
In turn, the geomagnetic situation in the first days of September is expected to be calm, with activity levels of 1-2 points (low, "green" level). However, short—term increases are possible: on September 3-4, up to the level of four points ("orange"), on September 5 and 7, the probability of a magnetic storm. On such days, weather-sensitive people should prepare for frequent headaches and loss of strength. This is stated in the preliminary forecasts of the Laboratory of Solar Astronomy of the IKI and the ISSF.
In Moscow, atmospheric pressure throughout the month will fluctuate in a narrow range — from about 744 to 748 mmHg, which corresponds practically to the norm for this time of year.
Weather forecast for September by regions of Russia
September 2025 promises to be truly contrasting and abnormal in Russia, with different weather depending on the region. In Central Russia and Moscow, the beginning of the month will be marked by warm days with temperatures up to 24 degrees Celsius, with possible short-term rains and thunderstorms.
By the second decade, the temperature will drop to +13...+18 degrees during the day and +8...+12 degrees at night, and precipitation will be close to the climatic norm. In St. Petersburg and the northwest, autumn will start warmer than usual, but with frequent rains and cloudy weather: around +15 degrees during the day and up to +13 degrees at night.
In the Volga region and the Urals, the first week of September will still retain summer warmth — up to +22...+23 degrees during the day and about +8...+10 degrees at night. A gradual cooling will begin in the second week, with rains and even night frosts of up to +4 degrees expected in some areas by the end of the month. The southern regions and the North Caucasus will continue to enjoy the remnants of summer: in the Krasnodar Territory and on the Black Sea coast, temperatures may rise to 30 degrees Celsius, especially in the first half of the month.
September will bring more drastic changes in Siberia and the northern Urals. In some areas, the first frosts and even snowfalls are already possible, especially at night, when the thermometer drops to -5...-7 degrees. In the eastern regions of the country, including the Far East, September will be rainy and cool, and Indian summer will shift to October and last about a week.
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