---
title: "The 'gentle September summer' in Ukraine is coming to an end: from September 21 — a noticeable cooling and rain"
description: "Forecaster Vitaliy Postrihan warned that after the \"gentle September summer,\" Ukraine will experience a noticeable cooling: from September 21, a cold Atlantic cyclone will bring rain and Scandinavian air."
date: 2026-09-18T08:46:01.000Z
lang: en
url: https://xab.info/en/posts/ukraine-cooling-after-gentle-september-summer
tags: [ukraine-weather, autumn-cooling, cyclone, weather-forecast, scandinavia-cold-air]
publisher: "XAB.info"
---

# The 'gentle September summer' in Ukraine is coming to an end: from September 21 — a noticeable cooling and rain

![People walking along a park path on a warm September day in Ukraine before the expected cooling](https://xab.info/media/2026/09/19/ukraina-poholodanie-posle-laskovogo-sentyabrya/ukraina-poholodanie-posle-laskovogo-sentyabrya-1.webp)

## 🎯 Key Points

- Until Sunday, September 20, Ukraine continues to enjoy a "gentle September summer" with temperatures above normal.
- From Monday, September 21, a cold front of an Atlantic cyclone and Scandinavian air will bring rain and a noticeable cooling.
- Preliminary estimates for September 22–25: +7…+12 °C at night, +12…+17 °C during the day, with no frosts — no threat to unharvested crops.

After a prolonged "gentle September summer," Ukraine is set to experience a significant cooling, according to forecasters. Rain will become noticeably more frequent, and the sun will more often hide behind the clouds. This is reported by RBC-Ukraine, citing a Facebook post by Vitaliy Postrihan, head of the Cherkasy Regional Hydrometeorological Center. The expert emphasized that the calendar already shows the second half of September, yet it is hard to call the current weather truly autumnal: "the atmosphere is prolonging summer," and the average daily temperature remains above normal, more in line with the climate of the early part of the month.

### What is happening now and until Sunday, September 20

According to Postrihan, until Sunday, September 20, the country will continue to enjoy a "gentle September summer" — warm, relatively dry, and sunny weather, atypical for late September. The forecaster noted, however, that changes in the weather situation have already begun: atmospheric processes are being restructured, and the stable warm background is gradually giving way to a colder, wetter air mass.

### The change on September 21: a cold front and Scandinavian air

A noticeable change in the weather is expected on Monday, September 21, when conditions will shift to a more typical autumnal mode. As Postrihan explained, a cold atmospheric front of a deep Atlantic cyclone will cross Ukraine, which, in his words, "will finally bring the long-awaited rains so needed by farmers for the sowing campaign." Along with the northern winds, cold, moist air from Scandinavia will enter the country, ensuring a marked drop in temperature.

### Forecast for the work week of September 22–25

For the next working period — September 22–25 — the expert provided "preliminary model estimates": nighttime air temperatures will be +7…+12 °C, daytime — +12…+17 °C. Postrihan recommended preparing umbrellas and light jackets in advance. The cold wave is expected to be noticeable but, according to his data, so far without frosts, which removes the main threat to field work and unharvested crops.

### Impact on agriculture and "pleasant pauses"

The absence of frosts, according to the forecaster's conclusion, means there is no threat to unharvested vegetable crops — the harvest can still be left in the fields. In closing, Postrihan noted that even under the "cyclonic pressure," nature will leave room for pleasant pauses, i.e., periods with clearings and more comfortable conditions. It is important to emphasize that the figures for September 22–25 are preliminary, model-based estimates and may be refined as the observation date approaches.

## 🔍 Fact-Check Verification

- [Will the warmth return? Forecaster says whether there will be an "Indian summer" after the cooling](https://www.rbc.ua/ukr/news/teplo-povernetsya-sinoptik-skazav-chi-bude-1789720422.html) - Подтверждает тему похолодания и поднимает вопрос о возможном возврате тепла («бабьем лете») после него; конкретные цифры в заголовке не приведены.
- [A cooling from Scandinavia is approaching Ukraine: forecasters named the exact dates when the summer ...](https://tsn.ua/ru/ukrayina/na-ukrainu-nadvigaetsya-poholodanie-iz-skandinavii-sinoptiki-nazvali-tochnye-daty-kogda-ot-leta-ne-ostanetsya-i-sleda-karta-3170579.html) - Совпадает с основной лентой: похолодание из Скандинавии, названы даты смены погоды.
- [A cyclone brings rain and autumnal cooling to Ukraine (map)](https://www.unian.net/pogoda/news/ciklon-neset-v-ukrainu-dozhdi-i-osennee-poholodanie-prognoz-sinoptika-13488567.html) - Подтверждает приход циклона с дождями и осенним похолоданием, наличие прогностической карты.
- [Indian summer in jeopardy: powerful cyclones bring cold, downpours and a sharp drop in warmth to Russia](https://www.pravda.ru/news/society/2402356-russia-autumn-weather-anomaly-2026/) - Контекстный источник по России; используется лишь как общий фон циклонической активности, не влияет на украинские цифры.

## ❓ FAQ

### Q: When exactly will the cooling begin in Ukraine?
**A:** According to Vitaliy Postrihan, a noticeable change in the weather is expected on Monday, September 21, 2026, when a cold atmospheric front of an Atlantic cyclone will pass through the country.

### Q: What temperatures are forecast for September 22–25?
**A:** Preliminary model estimates are provided: +7…+12 °C at night, +12…+17 °C during the day. No frosts are expected for now.

### Q: Do frosts threaten unharvested vegetable crops?
**A:** No. The forecaster noted that the cold wave is so far without frosts, so unharvested vegetable crops can be left in the fields.

### Q: How accurate is the forecast for the work week?
**A:** The figures for September 22–25 are preliminary model-based estimates and may be refined as the observation date approaches.