GUIDES / BASICS
Best time of year to watch the ISS
By Jeroen Wouda · 2 November 2026 · Basics
No month is reliably the best for seeing the space station, and any guide that names one is oversimplifying. What matters is the angle between the station's orbital plane and the Sun, and that angle runs through a cycle several times a year. The calendar is only a rough proxy for the geometry.
The rule, once more
Visible means the station is in sunlight while your sky is dark. Nothing about the season changes that. Seasons matter only because they change where the Sun is relative to the orbit.
Why the orbit plane drifts against the Sun
The station orbits at 51.6° inclination, roughly 400 km up, one lap every 92 to 93 minutes. Its orbital plane is fixed in space: it does not rotate to follow the Sun as the Earth travels round. So over the course of a year, the Sun's direction relative to that plane sweeps through a full range and back.
There are two extremes, and everything in between:
- Sun high above the plane of the orbit. The station hardly enters the Earth's shadow at all. It is sunlit for the whole of your night, and you can see it several times in one evening, on the evening side and again before dawn.
- Sun close to the plane of the orbit. The station spends long stretches of every orbit in the Earth's shadow. Its night-time passes are unlit and there is nothing to see for days or weeks.
Because the cycle repeats several times a year, every latitude gets both generous stretches and empty ones. Neither is unusual.
What that means in practice, season by season
These are tendencies from the geometry, not rules:
- Spring and autumn are, at mid-northern latitudes, usually the most productive stretches. The evening sky gets properly dark at a reasonable hour while the station is still catching the Sun, which is exactly the combination you want.
- Midsummer is the weakest season at high latitudes, for a different reason: the sky never becomes truly dark. The station may be sunlit and overhead, but against a bright blue-grey twilight it is hard to pick out, and a faint pass is hopeless.
- Winter has long, genuinely dark evenings, which helps. But the orbit may be turned so that the station is in shadow during exactly those evenings, so a good winter depends on which part of the cycle you are in.
Why the same week differs by latitude
Two observers in the same week can have quite different experiences. Latitude changes how high the station gets — nothing north of 51.6° ever sees it overhead — and it also changes how dark the sky becomes: a summer evening in the far north never reaches the darkness of a summer evening in the Mediterranean.
Light pollution matters less than most people assume for a bright pass, though it will wipe out a low, faint one. The station at 60° elevation is visible from a city street; the same station at 15° is not.
Within a season, the times slide
A visibility season is not a fixed timetable. Week to week the passes drift in local time, so the convenient early-evening pass becomes a later one, and the season ends with a stretch of awkward hours before it stops altogether. Then a gap of days or weeks, then a new season beginning at the other end of the night.
This is why checking once and giving up is a poor strategy, and checking every week or two is a good one. The pattern moves faster than most people expect.
The practical version
If you want one rule to remember: check the table, not the calendar. The geometry is already computed for you, city by city, and it will tell you far more than any general statement about seasons.
Then apply judgement on top:
- Prefer a pass that peaks high and late enough for a dark sky, at an hour you will actually be outside.
- Take the good pass when it comes. A pass that high may not repeat for weeks.
- In summer, be willing to stay up for a genuinely dark hour rather than trying at dusk.
- In winter, take the early-evening passes: the sky is already dark when they arrive.
A note on mornings
Morning passes are the half of each season people forget. They run before sunrise, when the sky is dark and the station is in sunlight ahead of you, and they can be as good as any evening pass. They are also quieter and, at some times of year, more frequent than evening ones. If the evening table looks thin, check the hours before dawn before concluding that the station has gone.
Where to go next
- ISS passes for your city
- Why the table sometimes goes empty
- How to photograph a pass once you have found one
More guides
- How often does the ISS pass over my city? — The station circles Earth 15 times a day, yet you can go weeks without a visible pass. Here is why the schedule behaves that way.
- How to photograph the ISS — A moving point of light, a dark sky and a camera, and what it takes to turn a pass into a photograph worth keeping.
- How to see the ISS tonight (without an app) — What to look for, when to look, and why an ordinary evening is often the wrong one — a plain guide to spotting the space station.