Weather in Stockholm in September

A good month. September is a solid month to be in Stockholm. Highs average 16.8 °C, lows 9.5 °C, and rain falls on 10 days — nothing in the month is working against you.

September ranks 4 of 12 in Stockholm: past the worst of the year but short of July, which is the month to book if the dates are open.

Rain on 10 days, 1 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 16.8 °C days and 9.5 °C nights; the spread matters more here than any single number.

What the averages hide

The averages here are honest — no hidden extremes worth planning around. Across the twenty years measured, the hottest September day reached 24.9 °C and the coldest night fell to 0 °C, and the wettest single day dropped 31 mm — roughly 56% of the month's rain in one day.

September is moderately variable: 19 mm in the driest year against 126 mm in the wettest, around an average of 55 mm. Roughly two Septembers in three land near that average, and the third does something else entirely.

Wind is light at 3.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 82%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 4.8 °C cooler than August, with October dropping another 7.1 °C. The first week and the last are not the same trip.

Daylight in September

13 hours of daylight, losing 2.6 hours across the month. That is between Stockholm's extremes of 18.6 and 6.2 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 27.8 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

September in Stockholm versus nearby

If Stockholm is one option among several, the nearby comparison is worth making. Linköping is close enough to be a coin toss — within a degree on temperature, 2 days more rain. Gothenburg is the weaker option in September — within a degree on temperature, 5 days more rain.

So: September is effectively as good as it gets here — 6 points behind July, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Stockholm

See all twelve months in Stockholm, or where else to go in September.