Climate averages 1991–2020

Niigata weather
in September.

A warm, wet month: the 3rd warmest and the 6th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 24.7°C Daytime mean, September

Average low 19.2°C Night-time mean, September

Rainfall 146 mm 14 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a warm month in Niigata: daytime highs average 24.7°C and nights cool to about 19.2°C. By daytime temperature it is the 3rd warmest of the 12 months.

Expect about 146 mm of rain on roughly 14 days, which makes September a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 28 min on an average September day.

The nearest other city in this atlas is Shibata (26 km away). In September its highs average 24.8°C, about as warm as Niigata, with 160 mm of rain.

Among the 303 cities listed in Japan, Niigata ranks joint 240th of 303 for the warmest September highs and 22nd of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Niigata is 0.9°C cooler than that mean.

From September to October, average highs fall by 5.7°C to 19.1°C, and monthly rainfall rises from 146 mm to 155 mm.

The annual picture

September in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Niigata climate table

1991–2020

Monthly climate averages for Niigata, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	4.2°C0.0°C	0.0°C	178	26.6	9.910 h
February	4.7°C-0.6°C	-0.6°C	115	21.3	10.811 h
March	8.6°C1.8°C	1.8°C	110	18.6	11.912 h
April	14.1°C6.0°C	6.0°C	90	12.6	13.213 h
May	19.4°C11.4°C	11.4°C	99	11.8	14.214 h
June	23.1°C16.5°C	16.5°C	123	11.2	14.715 h
July	26.6°C21.2°C	21.2°C	226	15.2	14.515 h
August	28.3°C22.7°C	22.7°C	159	12.9	13.614 h
September, selected	24.7°C19.2°C	19.2°C	146	14.2	12.512 h
October	19.1°C13.1°C	13.1°C	155	15.8	11.211 h
November	13.2°C7.5°C	7.5°C	164	19.7	10.210 h
December	7.5°C2.7°C	2.7°C	195	25.4	9.610 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

September in nearby cities

Distance from Niigata

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Niigata) is explained once on the Niigata year overview and on the Sources, method and limits page.