Missouri, United StatesMagnetic latitude 47.9°Population 10,957162 m above sea level
Can you see the northern lights in Union, Missouri?
Only severe geomagnetic storms (Kp 7.3 or more) bring the aurora into view from Union — a few nights per solar cycle, low in the north. Since 1995 that level (Kp 7.3) was reached during darkness here on 53 nights.
Right now
Quiet right now (Kp 1.7).
Updates every minute while this page is open.
Tonight in one minute
Not tonight
- Solar activity Too weak: Kp 3.3 expected, 7.3 needed here.
- Sky Mostly clear (0% cloud).
- Darkness Dark from 19:14 to 06:23. A bright moon (84%) washes out faint displays.
What to do: Not tonight — your next chance is shown just below.
Thursday 22 October — No · Kp 3.3 · Forecast cloud: 0%. · Reliability: good
Each box is one night: the colour shows the chance, the number the expected Kp. Tap a night for details.
📅 Add these nights to your calendar — it updates itself (.ics)
How far ahead can the northern lights be forecast?
- Minutes to an hour: satellites 1.5 million km away measure the solar wind before it reaches Earth. This is the surest warning — the “Right now” box uses it.
- 1–3 days: when the Sun throws out a cloud of particles, it takes one to three days to arrive. NOAA's 3-hourly forecast covers these nights; the timing can still be off by a few hours.
- 4–27 days: the Sun turns once every 27 days, and regions that disturbed Earth's field last time often do it again. NOAA's 27-day outlook gives this rough trend — new eruptions are not in it yet.
Tonight
Updated 04:20 local time
Unlikely
Best around 04:00. Forecast max Kp 3.3 (this place needs 7.3), average cloud 0%.
- Dark enough
- 19:14 – 06:23
- Sunset
- 18:16 · sunrise 07:21
- Moon
- 84% · ↑ 16:21 · ↓ 03:25
- Kp neededKp index: a 0–9 measure of geomagnetic activity. The higher it is, the further from the poles the aurora reaches.
- Kp 7.3
- Kp for photos
- In photos: from Kp 5.7 (a red glow low in the north).
- Look towards
- north (2°)
Cloud layers and weather
Low cloud blocks the aurora completely. Thin high cloud often still lets a bright aurora shine through, so a sky with only high cloud is worth a look.
| Time | Thu, 04 | Thu, 19 | Thu, 22 | Fri, 01 | Fri, 04 | Fri, 19 | Fri, 22 | Sat, 01 | Sat, 04 | Sat, 19 | Sat, 22 | Sun, 01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Low cloud | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| Mid cloud | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% |
| High cloud | 0% | 0% | 0% | 0% | 0% | 0% | 2% | 8% | 21% | 20% | 38% | 57% |
| Temperature | 10 °C | 18 °C | 15 °C | 14 °C | 12 °C | 18 °C | 15 °C | 13 °C | 11 °C | 18 °C | 16 °C | 14 °C |
| Feels like | 10 °C | 18 °C | 15 °C | 14 °C | 12 °C | 18 °C | 15 °C | 13 °C | 11 °C | 18 °C | 16 °C | 14 °C |
| Wind | 1 m/s | 2 m/s | 2 m/s | 2 m/s | 2 m/s | 3 m/s | 3 m/s | 3 m/s | 2 m/s | 3 m/s | 2 m/s | 2 m/s |
Cloud layers and weather: Open-Meteo (CC BY 4.0).
Score = activity (NOAA Kp and OVATION) × clear sky (MET Norway) × darkness × moonlight. Methodology
Weather in Union
The aurora only shows through clear skies, so the weather matters as much as the Kp index. Here is the general forecast for Union: temperature, wind and the chance of rain for the coming days.
Planning further ahead? See the hour-by-hour weather forecast for Union on Atlas of Seasons.
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What you would see from Union
Facing north. Bands show where the aurora sits at two activity levels.
| Kp | What you see | Lower edge | Ray tops | Distance to the aurora |
|---|---|---|---|---|
| 2 | Below the horizon | -4° | 0° | 1,624 km |
| 3 | Below the horizon | -2° | 2° | 1,401 km |
| 4 | Below the horizon | 0° | 4° | 1,179 km |
| 5 | Below the horizon | 2° | 7° | 956 km |
| 6 | Faint glow, mostly on camera | 5° | 12° | 734 km |
| 7 | Faint glow, mostly on camera | 9° | 19° | 512 km |
| 8 | Visible to the north | 19° | 33° | 289 km |
| 9 | Visible to the north | 57° | 71° | 67 km |
The Kp scale in plain words
Kp is a 0–9 score for how strongly the Earth's magnetic field is being shaken by the solar wind. The higher it goes, the further from the poles the northern lights reach. Kp 0–2 is a quiet night; Kp 5 and above is a geomagnetic storm.
- Kp 0–2 Quiet Only under the auroral oval: northern Norway, Swedish and Finnish Lapland, Iceland, Alaska, northern Canada.
- Kp 3 Unsettled next 24 h Bright in the Arctic; low on the horizon in central Scandinavia and southern Iceland.
- Kp 4 Active Overhead in the Arctic; low in the north from southern Norway, Sweden, Finland and northern Scotland.
- Kp 5 Minor storm (G1) Scotland, southern Scandinavia, the Baltic states, the northern US states and southern Canada.
- Kp 6 Moderate storm (G2) camera in Union Northern England, Denmark, northern Germany and Poland, the US Midwest — often clearer in photos than to the eye.
- Kp 7 Strong storm (G3) eye in Union Most of the UK, the Netherlands, Germany, Poland, Czechia; red glow in photos from France and the northern Alps.
- Kp 8 Severe storm (G4) Central Europe to the eye; red sky in photos from northern Italy, Spain, the Balkans and Turkey's Black Sea coast.
- Kp 9 Extreme storm (G5) Seen across Europe and the US; in photos as far south as the Mediterranean, Turkey and North Africa (May 2024).
Light pollution
Bright suburban sky. Strong sky glow washes out faint aurora. Head out of town for anything but a bright display.
Estimate from NASA VIIRS night-light data (sky-glow model within 50 km). Check access and private land before you go.
Hills and mountains
Terrain is not modelled for this place.
From elevation data (AWS Terrain Tiles) along seven lines of sight up to 30 km.
Best months to see the aurora in Union
Share of nights 2005–2025 that were dark, active enough here and mostly clear.
Activity of Kp 7.3 or more is too rare here for monthly odds to be meaningful. The table still shows how often nights are clear and dark.
| Month | Good nights | Clear nights | Darkness | Low / high |
|---|---|---|---|---|
| September | 0.3% | 76% | 9.6 h | 15° / 28°C |
| October | 0.3% | 73% | 10.9 h | 8° / 21°C |
| November | 0.3% | 66% | 11.9 h | 2° / 14°C |
| December | 0% | 50% | 12.3 h | -3° / 8°C |
| January | 0.2% | 54% | 12.0 h | -5° / 5°C |
| February | 0% | 59% | 11.0 h | -4° / 7°C |
| March | 0% | 56% | 10.0 h | 2° / 14°C |
| April | 0.2% | 61% | 8.6 h | 7° / 19°C |
Aurora nights in Union since 1995
Nights when Kp reached 7.3 or more while it was dark here.
Most recent strong nights
- 20 January 2026 · Kp 7.3
- 19 January 2026 · Kp 7.7
- 12 November 2025 · Kp 7.3
- 11 November 2025 · Kp 8.7
- 31 May 2025 · Kp 7.7
- 10 October 2024 · Kp 8.3
- 16 September 2024 · Kp 7.3
- 10 May 2024 · Kp 8.3
Practical information
- Nearest airport
- St. Louis Lambert International Airport (STL) · 65 km
- Typical low / high in May
- 13° / 24°C
- What to wear
- Cool nights: layers, a windproof jacket, hat and gloves for standing still outside. Full clothing guide
- Emergency number
- 911
- Winter driving
- Tyre and chain rules are set at state level; check Alaska 511 (511.alaska.gov, Alaska DOT&PF) for Alaska roads, or the relevant state's 511 service elsewhere. Road conditions
- Access to land
- There is no general right to roam; trespass law is set by each state, so stay on public land (national parks, national forests, BLM land) or get the landowner's permission, and follow each park's night-time and parking rules.
- Official space-weather service
- NOAA Space Weather Prediction Center (aurora dashboard)
- Weather service
- National Weather Service (NOAA)
Questions and answers
What Kp do you need to see the aurora in Union?
Only severe geomagnetic storms (Kp 7.3 or more) bring the aurora into view from Union — a few nights per solar cycle, low in the north.
Which way should I look for the aurora in Union?
Face north (about 2° from true north). At Kp 7.3 the lower edge of the aurora sits roughly 19° above the horizon; stronger activity lifts it higher and further across the sky.
When is the aurora season in Union?
Union gets dark enough for the aurora all year round, though the long winter nights give the most hours to watch.
Is there much light pollution in Union?
Strong sky glow washes out faint aurora. Head out of town for anything but a bright display.
When was the aurora last possible in Union?
The most recent night in our data when activity reached the level Union needs, during darkness, was 20 January 2026 (Kp 7.3). It has happened on 53 nights since 1995.
Also covered by this forecast
Villages and districts around Union share its forecast: within a few kilometres the sky, the Kp needed and the best direction are the same.
- Pohlman Mill 4 km
- Township of Union 5 km
- Krakow 6 km
- Franklin County 7 km
- Gildehouse 7 km
- Jeffriesburg 7 km
- Fourmile Corner 8 km
- Township of Central 11 km
- Clover Bottom 11 km
- Neier 11 km
- Villa Ridge 11 km
- Moselle 12 km
- Saint Clair 12 km
- Parkway 13 km
- The Diamonds 13 km
- Boles 14 km
- Beaufort 16 km
- Labadie 16 km
- Lyon 16 km
- Meramec Terrace 16 km
- Anaconda 17 km
- Benson Tourist City 17 km
- Campbellton 17 km
- Noser Mill 17 km
- Robertsville 17 km
- Augusta 18 km
- Greenstreet 18 km
- Piney Park 18 km
- Schmitt Ford 18 km
- Township of Calvey 19 km
- Peters Ford 19 km
- Plum Ford 19 km
- Catawissa 20 km
- Leslie 20 km
- Township of Lyon 21 km
- Mount Hope 21 km
- Port Hudson 21 km
- Stanton 21 km
- Twin Springs 21 km
- Charmwood 21 km