Nagaoka weather in July
In July, Nagaoka has daytime highs averaging 28 °C, nights around 20 °C, with 16 wet days, and a sea temperature of 23 °C. Figures are 1991–2020 climate normals.
- 28.2°C Average high
- 20.4°C Average low
- 16days Wet days
- 210mm Rainfall
- 23.3°C Sea temperature
- 15h Daylight
Daily temperatures through July
How July develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 July | 27.0 °C | 19.3 °C | 58 % |
| 11–20 July | 27.7 °C | 20.3 °C | 65 % |
| 21–31 July | 29.7 °C | 21.5 °C | 38 % |
- Average highs rise from 27.0 °C early in July to 29.7 °C by the end of it.
- Rain is most likely over days 11–20 of July (65 % of days) and least likely over days 21–31 (38 %).
What to expect
| Measure | Typical July | Share of the month |
|---|---|---|
| Days above 25 °C | 26 of 31 | 84 % |
| Days above 30 °C | 8.6 of 31 | 28 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 16 of 31 | 53 % |
Conditions in July
| Measure | Average |
|---|---|
| Mean temperature | 24 °C |
| Record high (1991–2020) | 37 °C |
| Record low (1991–2020) | 12 °C |
| Relative humidity | 85 % |
| Wind speed | 12 km/h |
| Cloud cover | 74 % |
July compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| May | 21.7 °C | 96 mm | 64 % |
| June | 25.3 °C | 122 mm | 73 % |
| July | 28.2 °C | 210 mm | 74 % |
| August | 29.8 °C | 155 mm | 62 % |
| September | 25.6 °C | 147 mm | 68 % |
See all twelve months for Nagaoka
- July is the 2nd warmest month here.
- It is the 12th driest month of the year.
- It ranks 9th for least cloud cover.
- Days last about 15 hours from sunrise to sunset.
- It rains on 16 of 31 days — 53 % of the month.
- Nights are about 7.8 °C cooler than the middle of the day.
- The hottest July day on record since 1991 reached 37 °C, 9.2 °C above the usual daytime high.
- Beach score: 73 / 100 — see how this is calculated.
QuestionsJuly in Nagaoka, answered
How warm is Nagaoka in July?
Daily highs average 28 °C and nights fall to about 20 °C, a spread of 7.8 °C between afternoon and dawn. That makes July the 2nd warmest month of the year here.
Does it rain much in Nagaoka in July?
July averages 210 mm of rain, spread over about 16 of the 31 days — 53 % of the month. Cloud cover averages 74 % of the sky.
Is the sea warm enough to swim in July?
The sea averages 23 °C off Nagaoka in July. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in July?
Nagaoka averages 15 hours between sunrise and sunset in July. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.