Weather in Kristiansand in September

Shoulder season. September sits in between. You will get good days and you will lose some. You should expect rain on 15 days of the month, which is more days wet than dry.

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

Rain on 15 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 15.4 °C days and 12.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 2.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 20.6 °C and the coldest night fell to 7.6 °C, and the wettest single day dropped 59 mm — roughly 53% 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 216 mm against 48 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 112 mm average is a reasonable planning figure, not a promise.

Wind is light at 15.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 85%, high enough to notice on the warm days without dominating them.

How September sits in the year

The month is on the way down: 2.7 °C cooler than August, with October dropping another 4 °C. The first week and the last are not the same trip.

Daylight in September

12.9 hours of daylight, losing 2.5 hours across the month. That is between Kristiansand's extremes of 18.2 and 6.5 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 15.1 °C in September — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. This is the warmest the water gets all year.

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 Kristiansand versus nearby

If Kristiansand is one option among several, the nearby comparison is worth making. Stavanger is close enough to be a coin toss — within a degree on temperature, 4 days more rain. Gothenburg is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: September works, with July the better month by 11 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Kristiansand

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