Itoigawa weather in July
In July, Itoigawa sees average daytime highs of 25°C and overnight lows near 21°C, with 254 mm of rain across 18.8 wet days and about 14.3 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.
Highs climb over the month, from about 23°C in the first days to 27°C by the end. The sky is clear or mostly clear about 15% of the time in July, and the air most often feels muggy.
Daylight stretches from about 14 h 30 min at the start of July to 13 h 54 min by month's end. Set against the rest of the year, July is Itoigawa's 10th-clearest and 10th-windiest month. For the whole year in context, see Itoigawa's year-round climate.
- Daytime high
- 25°
- 2nd warmest
- Overnight low
- 21°
- 11th coldest
- Rainfall
- 254 mm
- 18.8 wet days
- Daylight
- 14 h 18 min
- 4:45 AM – 7:04 PM
- Cloud cover
- 74%
- 10th clearest
- Wind
- 7 km/h
- 10th windiest
- Solar energy
- 5 kWh/m²
- Travel score
- 5.3
- out of 10
Itoigawa is city in Niigata prefecture, Japan.
- Density
- 55/km²
- people per km²
- Founded
- 1954
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Highs climb over the month, from about 23°C in the first days to 27°C by the end.
A typical July day in Itoigawa reaches about 25°C in the afternoon and slips back to 21°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, July runs about 4°C warmer than June and about 2°C cooler than August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 27 | 27 | 27 |
| Avg low (°C) | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 23 | 19 |
| 2 | 23 | 19 |
| 3 | 23 | 20 |
| 4 | 23 | 20 |
| 5 | 23 | 20 |
| 6 | 24 | 20 |
| 7 | 24 | 20 |
| 8 | 24 | 20 |
| 9 | 24 | 20 |
| 10 | 24 | 21 |
| 11 | 24 | 21 |
| 12 | 24 | 21 |
| 13 | 25 | 21 |
| 14 | 25 | 21 |
| 15 | 25 | 21 |
| 16 | 25 | 21 |
| 17 | 25 | 22 |
| 18 | 25 | 22 |
| 19 | 25 | 22 |
| 20 | 26 | 22 |
| 21 | 26 | 22 |
| 22 | 26 | 22 |
| 23 | 26 | 22 |
| 24 | 26 | 23 |
| 25 | 26 | 23 |
| 26 | 26 | 23 |
| 27 | 27 | 23 |
| 28 | 27 | 23 |
| 29 | 27 | 23 |
| 30 | 27 | 23 |
| 31 | 27 | 23 |
How July really feels in Itoigawa
Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Itoigawa weather by month
How July compares with the rest of the year at a glance. July is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 3° / -0° | 288 | 26.3 | 22.8 | 9.7 | 0.0 |
| Feb | 3° / -1° | 219 | 21.8 | 18.7 | 10.6 | 0.0 |
| Mar | 6° / 1° | 200 | 20.5 | 12.9 | 11.7 | 0.4 |
| Apr | 11° / 6° | 143 | 14.8 | 2.4 | 12.9 | 2.6 |
| May | 17° / 12° | 139 | 14.2 | 0 | 14 | 4.9 |
| Jun | 21° / 17° | 173 | 14.3 | 0 | 14.5 | 5.5 |
| Jul | 25° / 21° | 254 | 18.8 | 0 | 14.3 | 5.3 |
| Aug | 27° / 23° | 197 | 18.1 | 0 | 13.4 | 5.3 |
| Sep | 23° / 19° | 235 | 18.2 | 0 | 12.3 | 5.3 |
| Oct | 18° / 14° | 216 | 17.3 | 0 | 11 | 4.7 |
| Nov | 12° / 8° | 213 | 19.1 | 2.4 | 10 | 2.5 |
| Dec | 6° / 2° | 274 | 24.3 | 15.1 | 9.5 | 0.4 |
Cloud cover in July
The sky is clear or mostly clear about 15% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 13% of July, with mostly cloudy or overcast conditions the remaining 72%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 23 | 24 | 24 | 25 | 26 | 26 | 28 | 28 | 29 | 31 | 31 | 33 | 33 | 35 | 35 | 36 | 38 | 39 | 39 | 40 | 41 |
| Cloudier (%) | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 78 | 78 | 78 | 77 | 76 | 76 | 75 | 74 | 74 | 72 | 72 | 71 | 69 | 69 | 67 | 67 | 65 | 65 | 64 | 62 | 61 | 61 | 60 | 59 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 21 | 79 |
| 2 | 21 | 79 |
| 3 | 21 | 79 |
| 4 | 21 | 79 |
| 5 | 21 | 79 |
| 6 | 21 | 79 |
| 7 | 21 | 79 |
| 8 | 22 | 78 |
| 9 | 22 | 78 |
| 10 | 22 | 78 |
| 11 | 23 | 77 |
| 12 | 24 | 76 |
| 13 | 24 | 76 |
| 14 | 25 | 75 |
| 15 | 26 | 74 |
| 16 | 26 | 74 |
| 17 | 28 | 72 |
| 18 | 28 | 72 |
| 19 | 29 | 71 |
| 20 | 31 | 69 |
| 21 | 31 | 69 |
| 22 | 33 | 67 |
| 23 | 33 | 67 |
| 24 | 35 | 65 |
| 25 | 35 | 65 |
| 26 | 36 | 64 |
| 27 | 38 | 62 |
| 28 | 39 | 61 |
| 29 | 39 | 61 |
| 30 | 40 | 60 |
| 31 | 41 | 59 |
Chance of precipitation in July
Itoigawa gets around 254 mm of rain over 18.8 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 60% and peaks near 64% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 61 | 61 | 62 | 62 | 63 | 63 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 63 | 63 | 62 | 62 | 61 | 61 | 60 | 59 | 58 | 58 | 57 | 56 | 56 | 55 | 55 | 55 | 55 | 55 |
| Rain chance (%) | |
|---|---|
| 1 | 61 |
| 2 | 61 |
| 3 | 62 |
| 4 | 62 |
| 5 | 63 |
| 6 | 63 |
| 7 | 64 |
| 8 | 64 |
| 9 | 64 |
| 10 | 64 |
| 11 | 64 |
| 12 | 64 |
| 13 | 64 |
| 14 | 63 |
| 15 | 63 |
| 16 | 62 |
| 17 | 62 |
| 18 | 61 |
| 19 | 61 |
| 20 | 60 |
| 21 | 59 |
| 22 | 58 |
| 23 | 58 |
| 24 | 57 |
| 25 | 56 |
| 26 | 56 |
| 27 | 55 |
| 28 | 55 |
| 29 | 55 |
| 30 | 55 |
| 31 | 55 |
Humidity in July
Most of July feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the muggy band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 81% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Comfortable (%) | 7 | 6 | 5 | 4 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | 44 | 41 | 39 | 37 | 34 | 32 | 29 | 27 | 25 | 23 | 22 | 20 | 18 | 17 | 15 | 14 | 13 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 |
| Muggy (%) | 46 | 49 | 51 | 53 | 56 | 58 | 60 | 60 | 62 | 62 | 62 | 62 | 62 | 61 | 62 | 61 | 60 | 60 | 59 | 57 | 56 | 53 | 51 | 49 | 47 | 45 | 43 | 41 | 38 | 36 | 35 |
| Oppressive (%) | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 11 | 12 | 14 | 15 | 17 | 19 | 21 | 23 | 25 | 27 | 29 | 31 | 34 | 36 | 39 | 42 | 44 | 47 | 50 | 52 | 54 | 58 | 60 | 60 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 7 | 44 | 46 | 3 | 0 |
| 2 | 0 | 6 | 41 | 49 | 4 | 0 |
| 3 | 0 | 5 | 39 | 51 | 5 | 0 |
| 4 | 0 | 4 | 37 | 53 | 6 | 0 |
| 5 | 0 | 3 | 34 | 56 | 7 | 0 |
| 6 | 0 | 2 | 32 | 58 | 8 | 0 |
| 7 | 0 | 2 | 29 | 60 | 9 | 0 |
| 8 | 0 | 2 | 27 | 60 | 11 | 0 |
| 9 | 0 | 1 | 25 | 62 | 12 | 0 |
| 10 | 0 | 1 | 23 | 62 | 14 | 0 |
| 11 | 0 | 1 | 22 | 62 | 15 | 0 |
| 12 | 0 | 1 | 20 | 62 | 17 | 0 |
| 13 | 0 | 1 | 18 | 62 | 19 | 0 |
| 14 | 0 | 1 | 17 | 61 | 21 | 0 |
| 15 | 0 | 0 | 15 | 62 | 23 | 0 |
| 16 | 0 | 0 | 14 | 61 | 25 | 0 |
| 17 | 0 | 0 | 13 | 60 | 27 | 0 |
| 18 | 0 | 0 | 11 | 60 | 29 | 0 |
| 19 | 0 | 0 | 10 | 59 | 31 | 0 |
| 20 | 0 | 0 | 9 | 57 | 34 | 0 |
| 21 | 0 | 0 | 8 | 56 | 36 | 0 |
| 22 | 0 | 0 | 8 | 53 | 39 | 0 |
| 23 | 0 | 0 | 7 | 51 | 42 | 0 |
| 24 | 0 | 0 | 6 | 49 | 44 | 1 |
| 25 | 0 | 0 | 5 | 47 | 47 | 1 |
| 26 | 0 | 0 | 5 | 45 | 50 | 1 |
| 27 | 0 | 0 | 4 | 43 | 52 | 1 |
| 28 | 0 | 0 | 4 | 41 | 54 | 1 |
| 29 | 0 | 0 | 3 | 38 | 58 | 1 |
| 30 | 0 | 0 | 3 | 36 | 60 | 1 |
| 31 | 0 | 0 | 3 | 35 | 60 | 2 |
Wind in July
Winds average 7 km/h in July.
Across July, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in July
Daylight runs from about 14 h 30 min at the start of July to 13 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over July. Sunrise moves from 4:37 AM to 4:56 AM, and sunset from 7:07 PM to 6:53 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.5 | 14.4 | 14.4 | 14.4 | 14.4 | 14.4 | 14.4 | 14.3 | 14.3 | 14.3 | 14.3 | 14.3 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 | 14.1 | 14.1 | 14.1 | 14.1 | 14.0 | 14.0 | 14.0 | 13.9 |
| Sunrise (AM) | 4:37 | 4:37 | 4:37 | 4:38 | 4:38 | 4:39 | 4:39 | 4:40 | 4:40 | 4:41 | 4:42 | 4:42 | 4:43 | 4:44 | 4:44 | 4:45 | 4:46 | 4:46 | 4:47 | 4:48 | 4:48 | 4:49 | 4:50 | 4:51 | 4:51 | 4:52 | 4:53 | 4:54 | 4:55 | 4:55 | 4:56 |
| Sunset (PM) | 7:07 | 7:07 | 7:07 | 7:07 | 7:07 | 7:07 | 7:07 | 7:06 | 7:06 | 7:06 | 7:06 | 7:05 | 7:05 | 7:04 | 7:04 | 7:04 | 7:03 | 7:03 | 7:02 | 7:01 | 7:01 | 7:00 | 6:59 | 6:59 | 6:58 | 6:57 | 6:57 | 6:56 | 6:55 | 6:54 | 6:53 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.5 | 4:37 | 7:07 |
| 2 | 14.5 | 4:37 | 7:07 |
| 3 | 14.5 | 4:37 | 7:07 |
| 4 | 14.5 | 4:38 | 7:07 |
| 5 | 14.5 | 4:38 | 7:07 |
| 6 | 14.5 | 4:39 | 7:07 |
| 7 | 14.5 | 4:39 | 7:07 |
| 8 | 14.4 | 4:40 | 7:06 |
| 9 | 14.4 | 4:40 | 7:06 |
| 10 | 14.4 | 4:41 | 7:06 |
| 11 | 14.4 | 4:42 | 7:06 |
| 12 | 14.4 | 4:42 | 7:05 |
| 13 | 14.4 | 4:43 | 7:05 |
| 14 | 14.3 | 4:44 | 7:04 |
| 15 | 14.3 | 4:44 | 7:04 |
| 16 | 14.3 | 4:45 | 7:04 |
| 17 | 14.3 | 4:46 | 7:03 |
| 18 | 14.3 | 4:46 | 7:03 |
| 19 | 14.2 | 4:47 | 7:02 |
| 20 | 14.2 | 4:48 | 7:01 |
| 21 | 14.2 | 4:48 | 7:01 |
| 22 | 14.2 | 4:49 | 7:00 |
| 23 | 14.2 | 4:50 | 6:59 |
| 24 | 14.1 | 4:51 | 6:59 |
| 25 | 14.1 | 4:51 | 6:58 |
| 26 | 14.1 | 4:52 | 6:57 |
| 27 | 14.1 | 4:53 | 6:57 |
| 28 | 14.0 | 4:54 | 6:56 |
| 29 | 14.0 | 4:55 | 6:55 |
| 30 | 14.0 | 4:55 | 6:54 |
| 31 | 13.9 | 4:56 | 6:53 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 5 kWh/m².
For context, solar energy here swings from a low near 1.88 kWh/m² to a high of 5.67 kWh/m² in May across the year — July's 5 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.8 | Bright |
| 2 | 4.8 | Bright |
| 3 | 4.8 | Bright |
| 4 | 4.8 | Bright |
| 5 | 4.8 | Bright |
| 6 | 4.8 | Bright |
| 7 | 4.8 | Bright |
| 8 | 4.8 | Bright |
| 9 | 4.8 | Bright |
| 10 | 4.8 | Bright |
| 11 | 4.8 | Bright |
| 12 | 4.8 | Bright |
| 13 | 4.9 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.9 | Bright |
| 16 | 4.9 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.1 | Bright |
| 21 | 5.1 | Bright |
| 22 | 5.2 | Bright |
| 23 | 5.2 | Bright |
| 24 | 5.3 | Bright |
| 25 | 5.3 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.4 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.4 | Bright |
| 30 | 5.4 | Bright |
| 31 | 5.4 | Bright |
Hazard calendar for Itoigawa
In July, Itoigawa sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Itoigawa sits in the Pacific typhoon belt; the season peaks July–October.
Is July a good time to visit Itoigawa?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is a reasonable time to visit Itoigawa for sightseeing.
What to pack for Itoigawa in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Itoigawa sees daytime highs around 25°C and nights near 21°C. Pack rain gear. Worth having: light clothes and sun protection. About 19 days see rain.
Sea temperature near Itoigawa in July
The nearest coast averages about 23°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 27°C and coldest in March near 10°C.
It's comfortable for a long swim from Jun 20 to Nov 1 — about 4.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 11 | 10 | 11 | 15 | 20 | 23 | 27 | 25 | 22 | 19 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Warm | Refreshing | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 11 | Bracing |
| Mar | 10 | Bracing |
| Apr | 11 | Bracing |
| May | 15 | Bracing |
| Jun | 20 | Cool |
| Jul | 23 | Refreshing |
| Aug | 27 | Warm |
| Sep | 25 | Warm |
| Oct | 22 | Refreshing |
| Nov | 19 | Cool |
| Dec | 15 | Cool |
UV index in Itoigawa in July
Clear-sky midday UV in July peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Itoigawa peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 5 | 6 | 8 | 9 | 10 | 10 | 9 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 9 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Itoigawa in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Itoigawa is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 14 | 20 | 21 | 20 | 18 | 15 | 13 | 12 | 11 | 11 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 20 | Moderate |
| Apr | 21 | Moderate |
| May | 20 | Moderate |
| Jun | 18 | Moderate |
| Jul | 15 | Moderate |
| Aug | 13 | Moderate |
| Sep | 12 | Good |
| Oct | 11 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Itoigawa?
Itoigawa sits at 37.0°N, 137.8°E, 15 m above sea level, in Japan. The nearest listed city is Nyūzen, 33 km away.
Topography around Itoigawa
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Itoigawa.
Within 3 km, the terrain around Itoigawa has significant variations in elevation — a maximum elevation change of 312 m around an average of 44 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,586 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,069 m.
The land around Itoigawa is covered by trees (35%), water (30%) and artificial surfaces (24%) within 3 km, trees (50%) and water (45%) within 16 km, and trees (49%) and water (40%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Itoigawa (37.0333°, 137.85°, elevation 15 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).