Weather in Groningen in October

Shoulder season. October is shoulder season in Groningen — cheaper, quieter, and a genuine gamble. Highs sit at 14.2 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

October ranks 7 of 12 in Groningen: past the worst of the year but short of June, which is the month to book if the dates are open.

This is persistent light rain rather than storms: 14 wet days but only 1 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Layers, and a genuinely waterproof outer — at 14.2 °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 October day reached 24.2 °C and the coldest night fell to -2.8 °C, and the wettest single day dropped 27 mm — roughly 40% of the month's rain in one day.

October is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest October on record still delivered 114 mm against 32 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 67 mm average is a reasonable planning figure, not a promise.

Wind is light at 13.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 87%, which at 14.2 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How October sits in the year

The month is on the way down: 4.6 °C cooler than September, with November dropping another 5.2 °C. The first week and the last are not the same trip.

Daylight in October

10.7 hours of daylight, losing 2 hours across the month. That is between Groningen's extremes of 16.9 and 7.6 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 14.7 °C in October — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 18.4 °C in August and bottoms out at 5.3 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

October in Groningen versus nearby

If Groningen is one option among several, the nearby comparison is worth making. Bielefeld is close enough to be a coin toss — within a degree on temperature, 2 days less rain. Rotterdam is close enough to be a coin toss — within a degree on temperature, 1 day more rain.

So: October is a compromise. June is 20 points better and is what Groningen is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Groningen

See all twelve months in Groningen, or where else to go in October.