Weather in Ust-Ilimsk

Planning your day in Ust-Ilimsk? In this section, you will find the latest weather information, including current data, forecasts, and useful charts.

The climate in Ust-Ilimsk can be characterized as sharply continental. This means the city experiences significant temperature fluctuations between seasons, with very cold winters and short but warm summers. If you are planning a trip, be prepared for distinct seasonal weather changes.

Winters in Ust-Ilimsk are long and severe, with the average temperature in January and December hovering around -21°C, and frosts can be even stronger. Summer, on the other hand, is short but quite warm, especially in July, when the average temperature reaches +19.2°C. Spring and autumn are transitional seasons characterized by rapid changes in weather conditions and noticeable temperature jumps.

One of the features of the local climate is the relatively low amount of precipitation throughout the year, usually not exceeding 1-2 mm per month. Nevertheless, the number of days with precipitation (in the form of snow in winter or rain during the warm season) remains fairly constant, indicating frequent but not very heavy falls. This is an important aspect for planning outdoor activities.

The annual temperature progression in Ust-Ilimsk clearly demonstrates the region's climatic features. The coldest months are December and January, when the average monthly air temperature is -21.3°C. During these months, minimum temperatures regularly drop to -24.8°C, and daily maximums rarely rise above -17.7°C. The warmest month is July, with an average temperature of +19.2°C. In July, daytime highs average +23.9°C, ensuring comfortable summer warmth.

Winter in Ust-Ilimsk is prolonged and frosty. By November, the average temperature drops to -11.8°C, heralding the arrival of severe cold. After the peak frosts in December and January, February brings some softening (averaging -18.1°C). March remains a winter month with an average temperature of -7.9°C and night frosts down to -12.4°C. A confident transition to positive average daily temperatures occurs in April (-0.4°C on average), when nature begins to awaken from its winter sleep.

The summer period in Ust-Ilimsk is relatively short but warm. In May, the average temperature rises to +7.9°C, and in June it reaches +16.5°C, with daytime highs around +21.8°C. After the warmest July, August also delights with summer weather, featuring an average temperature of +16.6°C and daytime values up to +21.2°C. Autumn arrives quickly: in September the average temperature is already +8.0°C, and in October it approaches zero (+0.5°C). A characteristic feature of Ust-Ilimsk is noticeable diurnal temperature fluctuations, especially in the spring-summer period. For example, in May and June, the difference between the maximum day and minimum night temperature can exceed 10°C.

Precipitation in Ust-Ilimsk is characterized by a very small total amount throughout the year, amounting to just 1-2 mm per month. Despite this, days with precipitation occur quite regularly. This means that when precipitation falls, it is usually very light, whether it be fine rain or light snow, given the region's climatic conditions.

It is difficult to identify a clearly defined rainy season or dry season in Ust-Ilimsk due to the extremely low absolute precipitation values. Nevertheless, it can be noted that the months from June to October receive slightly more precipitation (averaging 2 mm) compared to the other months (1 mm). In winter, roughly from November to April, when temperatures are consistently below freezing, precipitation falls mainly as snow. In warmer months, from May to September-October, precipitation typically takes the form of rain.

In terms of volume, the "wettest" months, receiving 2 mm of precipitation, are June, July, August, September, and October. The remaining months—January, February, March, April, May, November, and December—receive 1 mm. Regarding the number of days with precipitation, the highest number falls in November (averaging 14 days), as well as March, August, September, October, and December (12-13 days). The fewest number of precipitation days is observed in February (averaging 8 days), making it the month with the least frequent, though still light, precipitation.

When packing for a trip to Ust-Ilimsk, it is important to consider its sharply continental climate with very cold winters and short but warm summers. Winter months (from November to March) require particularly careful preparation: be sure to bring multi-layered warm clothing. The foundation of your wardrobe should be thermal underwear, fleece tops, a warm sweater, as well as a windproof and waterproof winter jacket or down coat designed for severe frosts (temperatures can drop to -25°C and below). Don't forget a warm hat that covers your ears, a voluminous scarf or snood, and very warm mittens or gloves. Given the frequent, though not heavy snowfalls, waterproof warm shoes with non-slip soles will be extremely important.

For the summer months (June-August), when the average temperature rises to +16...+19°C and can reach +24°C during the day, lighter items will suffice: t-shirts, long-sleeved shirts, light trousers, or jeans. However, even in summer, evenings can be cool, so a sweater or light jacket wouldn't go amiss. In the off-season (April-May and September-October), the weather is very changeable: it can be relatively warm during the day and freezing at night. Here, the principle of layering comes in handy: a t-shirt, a fleece or sweater over it, and a mid-season jacket. Since precipitation, although not heavy (1-2 mm), happens quite often (9-14 days a month), a light umbrella or raincoat will be useful at any time of year, except winter, when a hood and waterproof outerwear will replace them.

Regardless of the season, you will need comfortable footwear for walking around Ust-Ilimsk. In summer, this could be sneakers or closed shoes; in winter, insulated boots. Sunscreen and sunglasses are relevant not only in summer but also in winter when the sun reflects off the snow. Also, do not forget your usual toiletries and necessary medications. The adaptability of your wardrobe to changing conditions is the key to a comfortable journey.