Weather in Niigata in October

A good month. October is a solid month to be in Niigata. You should expect rain on 16 days of the month, which is more days wet than dry.

October ranks 5 of 12 in Niigata: past the worst of the year but short of June, which is the month to book if the dates are open.

Rain on 16 days, 5 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 October reaches 30 °C; the day barely swings — 2.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest October day reached 27.4 °C and the coldest night fell to 10.5 °C, and the wettest single day dropped 71 mm — roughly 47% 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 241 mm against 78 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 151 mm average is a reasonable planning figure, not a promise.

Wind is light at 14.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 73%.

How October sits in the year

The month is on the way down: 5.1 °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

11.3 hours of daylight, losing 1.2 hours across the month. That is between Niigata's extremes of 14.8 and 9.6 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 21.2 °C in October — comfortable for a proper swim. The sea peaks at 26.2 °C in August and bottoms out at 9.8 °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

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.

October in Niigata versus nearby

If Niigata is one option among several, the nearby comparison is worth making. Sendai is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Utsunomiya is close enough to be a coin toss — within a degree on temperature, 3 days less rain.

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

Every month in Niigata

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