Weather in Oslo in August

A good month. August works. It is not the peak, but nothing about it fights you. You should expect rain on 17 days of the month, which is more days wet than dry.

August ranks 3 of 12 in Oslo. Only June scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 17 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average August reaches 30 °C. Across the twenty years measured, the hottest August day reached 31.1 °C and the coldest night fell to 3.9 °C, and the wettest single day dropped 31 mm — roughly 25% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 187 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 122 mm average is a reasonable planning figure, not a promise.

Wind is light at 1.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 84%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 21.7 °C in July, 20.3 here, 16 in September. Nothing about the timing within the month matters much.

Daylight in August

15.7 hours of daylight, losing 2.6 hours across the month. That is between Oslo's extremes of 18.8 and 6 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 28.8 °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.

August in Oslo versus nearby

If Oslo is one option among several, the nearby comparison is worth making. Kristiansand is close enough to be a coin toss — 2.2 °C cooler, 1 day less rain. Gothenburg is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: August is effectively as good as it gets here — 5 points behind June, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in Oslo

See all twelve months in Oslo, or where else to go in August.