Weather in Umeå in September

Shoulder season. September sits in between. You will get good days and you will lose some. Highs sit at 13.5 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

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

Rain on 13 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 13.5 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

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 20.9 °C and the coldest night fell to -2 °C, and the wettest single day dropped 41 mm — roughly 48% of the month's rain in one day.

September is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest September on record still delivered 151 mm against 19 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 86 mm average is a reasonable planning figure, not a promise.

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 89%, which at 13.5 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How September sits in the year

The month is on the way down: 4.8 °C cooler than August, with October dropping another 7.4 °C. The first week and the last are not the same trip.

Daylight in September

13.2 hours of daylight, losing 3.2 hours across the month. That is between Umeå's extremes of 20.8 and 4.4 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 30 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

September in Umeå versus nearby

If Umeå is one option among several, the nearby comparison is worth making. Rovaniemi is the weaker option in September — within a degree on temperature, 2 days more rain. Trondheim is the weaker option in September — within a degree on temperature, 5 days more rain.

So: September works, with July the better month by 17 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Umeå

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