Niigata climate by month
Averages and records for each calendar month at Niigata, Japan, from 1951 to 2026. The warmest month is August, averaging 30.2°C; the coolest is January at 5.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.2°C | −0.4°C | 15.3°C10 January 1979 | −8.3°C21 January 1984 | 64 / 75 |
| February | 5.8°C | −0.5°C | 21.3°C22 February 2004 | −10.6°C17 February 1978 | 66 / 75 |
| March | 9.3°C | 1.7°C | 24.7°C27 March 2025 | −5.4°C7 March 1971 | 67 / 75 |
| April | 15.8°C | 6.8°C | 30.7°C21 April 1987 | −1.8°C2 April 1970 | 68 / 75 |
| May | 21.0°C | 12.1°C | 32.9°C2 May 1998 | 2.2°C3 May 1953 | 69 / 75 |
| June | 24.2°C | 17.1°C | 34.7°C21 June 2004 | 9.6°C4 June 1973 | 69 / 75 |
| July | 28.3°C | 21.4°C | 38.4°C29 July 2018 | 12.5°C3 July 2026 | 67 / 75 |
| August | 30.2°C | 22.7°C | 39.9°C23 August 2018 | 14.5°C20 August 1956 | 67 / 75 |
| September | 25.8°C | 18.3°C | 37.1°C13 September 2003 | 9.3°C29 September 1960 | 65 / 74 |
| October | 20.0°C | 12.0°C | 33.2°C6 October 2018 | 3.0°C31 October 1983 | 67 / 74 |
| November | 14.1°C | 6.4°C | 27.2°C1 November 1977 | −1.8°C30 November 1970 | 66 / 74 |
| December | 8.5°C | 2.1°C | 20.4°C1 December 2025 | −9.5°C31 December 1969 | 62 / 74 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 62 to 69 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.