Ukraine heats up to +25: what the weather will be like on September 17 and where rain is expected

On September 17, 2026, most regions of Ukraine are expected to enjoy comfortable, warm weather with no significant precipitation. According to the Ukrainian Hydrometeorological Center, as cited by RBC-Ukraine, daytime temperatures will reach +25 degrees in some areas, while the weather across most of the country will be shaped by a field of high atmospheric pressure. Variable cloud cover and a predominantly southwest wind of 5–10 m/s will create conditions that meteorologists traditionally classify as the "warm" phase of early autumn.

The big picture: a high-pressure field

According to the forecast, calm and mostly dry weather across most oblasts will be ensured by an anticyclone — an area of high atmospheric pressure. It is this system that "seals off" precipitation and keeps clear or partly cloudy skies over the central, eastern, and southern regions. The wind will blow predominantly from the southwest at 5–10 m/s, with no gusts or sharp swings in sight. Such a configuration is typical of the transitional period, when the summer heat has already receded but the autumn coolness has not yet taken hold.

West under a front, center — dry

The western oblasts will be the exception: in Lviv, Volyn, and Rivne oblasts, a cold atmospheric front arriving from Western Europe will bring light rain during the day. Thus, precipitation will be local and confined to the western periphery of the country, while no rain is expected in the rest of Ukraine. This regional split is confirmed by other reports as well: during this period the weather effectively "divides" the western and central oblasts, where the dry anticyclone retains the upper hand.

Kyiv and the region

In Kyiv and Kyiv Oblast, September 17 is forecast to bring variable cloud cover with no precipitation. The capital region will fall within the influence of the same high-pressure field as the center of the country, so no rain is expected in the capital. This makes the day convenient for walks and outdoor activities, especially in open urban spaces, where the warm, calm weather will feel most comfortable.

Conflicting data

Here it is worth honestly noting a difference in emphasis between sources. RBC-Ukraine and the base summary from the Ukrainian Hydrometeorological Center paint a picture of predominantly dry, warm weather with rain only in the west. At the same time, the outlet my.ua, in the headline and body of the same forecast, stresses a "nighttime surprise," hinting at a possible overnight cooling or local precipitation that the daytime summary does not highlight as a key feature. In other words, one version emphasizes daytime warmth up to +25 and dryness, while the other — nighttime changes that may soften the comfort. The difference is not a direct contradiction in the numbers, but reflects different slices of the same forecast: the daytime maximum versus the nighttime dynamics. Readers should keep both components in mind when planning their day and night.

Context: Indian summer and thermometer accuracy

The warm weather on September 17 fits into the broader story of an "early Indian summer" — a period when stable warmth returns after the first coolings. Earlier, the Ukrainian Hydrometeorological Center also explained exactly how specialists measure air temperature and why a home thermometer can "lie" due to improper placement, solar heating, or proximity to walls. This matters for those who compare forecasts with their own instruments: official readings are taken using strict methodologies at weather stations, not in the shade of a balcony or under direct sunlight.