Weather in Stavanger in September

A hard month. September asks something of you. Go in knowing what. You should expect rain on 19 days of the month, which is more days wet than dry.

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

Rain on 19 days, 6 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 15.1 °C days and 11.7 °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 — 3.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest September day reached 22.7 °C and the coldest night fell to 6.9 °C, and the wettest single day dropped 51 mm — roughly 30% 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 295 mm against 77 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 170 mm average is a reasonable planning figure, not a promise.

Wind is light at 12.7 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 3.9 °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 Stavanger's extremes of 18.4 and 6.3 hours, so days are long enough not to constrain the plan.

An inland climate

Despite being inland, the year stays fairly even: 17.2 °C between the year's warmest afternoons and coldest nights.

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 Stavanger versus nearby

If Stavanger is one option among several, the nearby comparison is worth making. Kristiansand is close enough to be a coin toss — within a degree on temperature, 4 days less rain. Bergen is close enough to be a coin toss — within a degree on temperature, 3 days more rain.

So: September works, with July the better month by 10 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Stavanger

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