Northern lights in St. Louis tonight
The aurora forecast for St. Louis, Missouri, hour by hour: the Kp index NOAA expects, darkness, the Moon and the cloud forecast for the city.
Unlikely Monday, October 26
The highest Kp expected after dark tonight is 1.67. St. Louis needs about Kp 8 to see the aurora low on the northern horizon, and the sky cover forecast after dark averages 40%. The Moon is 98% lit.
| Time | Sky | Kp | Clouds | Moon | Chance |
|---|---|---|---|---|---|
| 7 PM | Twilight | 1.67 | 30% | 8° | Not dark yet |
| 8 PM | Dark | 1.67 | 31% | 19° | Unlikely |
| 9 PM | Dark | 1.67 | 32% | 30° | Unlikely |
| 10 PM | Dark | 1.33 | 32% | 42° | Unlikely |
| 11 PM | Dark | 1.33 | 32% | 53° | Unlikely |
| 12 AM | Dark | 1.33 | 31% | 63° | Unlikely |
| 1 AM | Dark | 1.33 | 30% | 71° | Unlikely |
| 2 AM | Dark | 1.33 | 38% | 73° | Unlikely |
| 3 AM | Dark | 1.33 | 46% | 66° | Unlikely |
| 4 AM | Dark | 1.33 | 55% | 56° | Unlikely |
| 5 AM | Dark | 1.33 | 54% | 45° | Unlikely |
| 6 AM | Dark | 1.33 | 54% | 34° | Unlikely |
Forecast from NOAA SWPC (Kp, 3-hour blocks) and the National Weather Service (sky cover), checked when this page was built. The page updates itself when it can reach our data feed.
What Kp you need in St. Louis
The farther north (in magnetic terms) you stand, the lower the Kp you need. From St. Louis, an aurora usually shows low on the northern horizon once Kp reaches about 8; overhead displays need about two steps more. A phone camera in night mode often records it one step earlier than the eye. How we estimate this: our method.
How often the aurora reaches St. Louis
Our own count from the official Kp archive: on how many nights each year the Kp index reached about 8 or more while it was dark at St. Louis. Clouds are not counted, so the real number of nights with a visible aurora is lower. Over the last 10 years the average was 0.6 nights a year; in 2025 it was 1.
Data: Kp index since 1932, GFZ Helmholtz Centre for Geosciences (Matzka et al., 2021), CC BY 4.0. Darkness computed by us for each 3-hour interval (Sun 12° or more below the horizon).
The next 27 days
NOAA's 27-day outlook has no day with a largest Kp near the 8 that St. Louis needs. The outlook repeats the Sun's 27-day rotation and cannot see sudden storms, so check the 3-day forecast too.
| Day (UTC) | Largest Kp | At St. Louis |
|---|---|---|
| Mon, Oct 26 | 2 | Unlikely |
| Tue, Oct 27 | 2 | Unlikely |
| Wed, Oct 28 | 2 | Unlikely |
| Thu, Oct 29 | 2 | Unlikely |
| Fri, Oct 30 | 2 | Unlikely |
| Sat, Oct 31 | 5 | Unlikely |
| Sun, Nov 1 | 4 | Unlikely |
| Mon, Nov 2 | 3 | Unlikely |
| Tue, Nov 3 | 2 | Unlikely |
| Wed, Nov 4 | 2 | Unlikely |
First 10 days shown. Full table: 27-day aurora forecast.
Where to watch in St. Louis
In St. Louis the aurora shows up only during strong storms, often faint and low. The river bluffs to the north and the farmland of northeast Missouri give darker skies. Summer haze from the rivers can soften the view.
Find a bluff or field with an open view north, away from the city glow.
- Pere Marquette State Park: bluff top state park in Illinois near Grafton, about 45 miles north
- Cuivre River State Park: rural state park near Troy, about 55 miles northwest
Nearby cities
Questions people ask
Can you see the northern lights in St. Louis, MO?
Yes, on active nights. From St. Louis it takes about Kp 8, which happened on about 0.6 nights a year over the last 10 years (before clouds).
What time is best?
Usually between 10 pm and 2 am local time, when the sky is fully dark and your location faces the night side of the auroral oval. Storms can bring it earlier or later.
Which way should I look?
North, toward a low, open horizon away from city lights. In strong storms the aurora can climb higher or appear overhead.
Is this an official forecast?
No. It is our estimate built from NOAA's Kp forecast, the National Weather Service sky cover forecast and the Sun and Moon positions. It is not a promise.
Sources: Kp forecast and 27-day outlook: NOAA Space Weather Prediction Center (public domain). Sky cover: National Weather Service (public domain). Kp archive: GFZ, CC BY 4.0. Coordinates: U.S. Census Bureau Gazetteer. Magnetic latitude: our calculation from the IGRF-14 model of Earth's magnetic field. Sun and Moon: Astronomy Engine. Unofficial estimates, not a guarantee.
Page checked: October 26, 2026.