--- title: "Magnetic Storms Sept 4–6: NOAA Forecasts No Storm, Max Kp at 2.67" description: "According to NOAA, the geomagnetic field will remain quiet from September 4–6: the maximum Kp index will not exceed 2.67, which is below the G1 storm threshold. No real storm is expected over the weekend." date: 2026-09-04T13:04:01.000Z lang: en url: https://xab.info/en/posts/magnetic-storms-forecast-weekend-4-6-september tags: [geomagnetic-storm, solar-activity, space-weather, noaa, kp-index] publisher: "XAB.info" --- # Magnetic Storms Sept 4–6: NOAA Forecasts No Storm, Max Kp at 2.67 ![Woman in profile against a glowing projection of Earth — illustration for the September 4–6 magnetic storm forecast](https://xab.info/media/2026/09/04/magnitnye-buri-prognoz-na-vyhodnye-4-6-sentyabrya/magnitnye-buri-prognoz-na-vyhodnye-4-6-sentyabrya-1.webp) ## 🎯 Key Points - On September 4, geomagnetic conditions are quiet, with the Kp index within 1–1.67 - The maximum Kp for September 4–6 per NOAA is 2.67, below the G1 storm threshold (Kp 5) - A slight increase in activity is possible on Sunday, September 6, but not a storm - The first half of September is expected to be quiet, with activity possibly rising toward the end of the month At the start of September, the geomagnetic conditions on Earth remain stable, and the upcoming weekend, according to current expert assessments, will pass without sharp fluctuations in the magnetic field. According to the forecast issued on September 4, on Friday, September 4, the Kp index will stay within a range of approximately 1 to 1.67 over the course of the day. Such values fall into the category of quiet geomagnetic conditions and show no signs of an approaching disturbance. In other words, no strong geomagnetic storm is expected today or over the next 24 hours. ### NOAA Data: Maximum Below the Storm Threshold Operational data was released by the NOAA Space Weather Prediction Center. In the forecast covering the period from September 4 to 6, the highest expected Kp index value is 2.67. This level remains well below the threshold at which the first category of geomagnetic storm, G1, begins. On the NOAA scale, the G1 threshold is reached at Kp 5, meaning the forecast maximum for these three days is almost half the storm boundary. For this reason, there is no basis for speaking of a "real" magnetic storm over the weekend. ### Sunday: Slight Intensification Without a Storm On Saturday, September 5, the situation remains unchanged: the forecast Kp is around 1.33–1.67, and the geomagnetic field continues to stay quiet. A slight increase in activity is possible only on Sunday, September 6, when the maximum forecast value reaches Kp 2.67. Nevertheless, even this peak level does not reach the G1 category, so it is classified as a moderate rather than a storm-level disturbance. The weekend will most likely pass without a powerful geomagnetic storm. ### September Outlook and Forecast Dynamics Experts emphasize that the space weather forecast is dynamic: solar activity can change within a short period, so NOAA data are updated periodically. According to preliminary assessments, the first half of September should pass relatively quietly overall, although periods of elevated geomagnetic activity are possible toward the end of the month. It is recommended to monitor the situation through the latest forecast updates. Thus, for September 4–6, no strong magnetic storm is forecast, and the expected Kp maximum of 2.67 remains below the geomagnetic storm scale level. ## 🔍 Fact-Check Verification - [Magnetic storms today and over the weekend: will it "storm" on September 4–6](https://styler.rbc.ua/ukr/useful/magnitni-buri-sogodni-ta-vihidnih-chi-shtormitime-1788520223.html) - Первичный источник: Kp 1–1,67 (4.09), 1,33–1,67 (5.09), максимум 2,67 (6.09); порог G1 = Kp 5; данные NOAA SWPC от 4.09.2026. - [Magnetic storms: weekend forecast for September 5–6](https://tsn.ua/ru/lady/zdorovye/aktualnaya-tema/magnitnye-buri-prognoz-na-vyhodnye-5-6-sentyabrya-3161891.html) - Контекстный источник по прогнозу на выходные; не содержит противоречащих числовых значений. - [Fragile "calm": magnetic storm forecast for September 2026 published](https://gorod55.ru/news/2026-09-02/hrupkoe-spokoystvie-opublikovan-prognoz-magnitnyh-bur-na-sentyabr-2026-goda-5673462) - Контекст по месячному прогнозу: первая половина сентября спокойная, к концу месяца возможна повышенная активность. - [Will storms ruin Saturday: geomagnetic conditions forecast for September 5, 2026](https://www.rosbalt.ru/news/2026-09-04/isportyat-li-buri-subbotu-prognoz-geomagnitnoy-obstanovki-na-5-sentyabrya-2026-5674985) - Контекстный источник по субботней обстановке; согласуется со спокойным прогнозом Kp ~1,33–1,67. ## ❓ FAQ ### Q: Is a magnetic storm expected on September 4–6? **A:** No. According to NOAA, the maximum Kp index for this period is 2.67, which is below the G1 geomagnetic storm threshold (Kp 5). No storm is forecast. ### Q: What is the forecast for Sunday, September 6? **A:** A slight increase in activity is possible, with a maximum Kp of around 2.67. This is a moderate disturbance that does not reach the G1 storm level. ### Q: Will September be quiet overall? **A:** The first half of the month is expected to be relatively quiet, although periods of elevated geomagnetic activity are possible toward the end of September, so the forecast should be tracked through NOAA updates.