Jōetsu weather in April
In April, Jōetsu sees average daytime highs of 15°C and overnight lows near 8°C, with 97 mm of precipitation across 13.4 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 11th-wettest month of the year here.
Highs climb over the month, from about 13°C in the first days to 18°C by the end. The sky is clear or mostly clear about 31% of the time in April, and the air most often feels dry.
Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is Jōetsu's 1st-clearest and 6th-windiest month. For the whole year in context, see Jōetsu's year-round climate.
- Daytime high
- 15°
- 7th warmest
- Overnight low
- 8°
- 5th coldest
- Precipitation
- 97 mm
- 13.4 wet days
- Daylight
- 13 hours
- 5:19 AM – 6:16 PM
- Cloud cover
- 59%
- 1st clearest
- Wind
- 12 km/h
- 6th windiest
- Solar energy
- 5.28 kWh/m²
- Travel score
- 4.3
- out of 10
Jōetsu is city in Niigata Prefecture, Japan.
- Density
- 195/km²
- people per km²
- Founded
- 1971
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in April
Highs climb over the month, from about 13°C in the first days to 18°C by the end.
A typical April day in Jōetsu reaches about 15°C in the afternoon and slips back to 8°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 20°C. Set against its neighbours, April runs about 6°C warmer than March and about 5°C cooler than May.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 |
| Avg low (°C) | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 12 | 5 |
| 2 | 12 | 5 |
| 3 | 13 | 6 |
| 4 | 13 | 6 |
| 5 | 13 | 6 |
| 6 | 13 | 6 |
| 7 | 13 | 6 |
| 8 | 14 | 6 |
| 9 | 14 | 7 |
| 10 | 14 | 7 |
| 11 | 14 | 7 |
| 12 | 14 | 7 |
| 13 | 15 | 7 |
| 14 | 15 | 8 |
| 15 | 15 | 8 |
| 16 | 15 | 8 |
| 17 | 15 | 8 |
| 18 | 16 | 8 |
| 19 | 16 | 8 |
| 20 | 16 | 9 |
| 21 | 16 | 9 |
| 22 | 16 | 9 |
| 23 | 17 | 9 |
| 24 | 17 | 9 |
| 25 | 17 | 10 |
| 26 | 17 | 10 |
| 27 | 17 | 10 |
| 28 | 18 | 10 |
| 29 | 18 | 10 |
| 30 | 18 | 10 |
How April really feels in Jōetsu
Once humidity and wind are folded in, April 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.
April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Jōetsu weather by month
How April compares with the rest of the year at a glance. April is the 7th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 6° / 1° | 253 | 25.9 | 16.3 | 9.7 | 0.2 |
| Feb | 6° / 1° | 178 | 21.2 | 13.3 | 10.6 | 0.3 |
| Mar | 10° / 3° | 145 | 19.6 | 6.5 | 11.7 | 1.6 |
| Apr | 15° / 8° | 97 | 13.4 | 0.4 | 12.9 | 4.3 |
| May | 20° / 13° | 92 | 11.6 | 0 | 14 | 6.1 |
| Jun | 24° / 18° | 115 | 11.5 | 0 | 14.5 | 6.4 |
| Jul | 28° / 22° | 191 | 14.4 | 0 | 14.3 | 5.3 |
| Aug | 30° / 24° | 122 | 12.1 | 0 | 13.4 | 4.9 |
| Sep | 26° / 20° | 162 | 14.1 | 0 | 12.3 | 5.8 |
| Oct | 20° / 14° | 164 | 15.1 | 0 | 11 | 5.6 |
| Nov | 14° / 8° | 180 | 18.5 | 0.3 | 10 | 3.4 |
| Dec | 9° / 4° | 247 | 24.2 | 8.4 | 9.5 | 1.1 |
Cloud cover in April
The sky is clear or mostly clear about 31% of the time in April, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 15% of April, with mostly cloudy or overcast conditions the remaining 54%. 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 43 | 45 | 45 | 45 | 45 | 45 | 46 | 46 | 47 | 47 | 47 | 48 | 47 | 47 | 46 | 47 | 46 | 45 | 46 | 46 | 45 | 46 | 46 | 46 | 45 | 45 | 46 | 46 | 46 | 46 |
| Cloudier (%) | 57 | 55 | 55 | 55 | 55 | 55 | 54 | 54 | 53 | 53 | 53 | 52 | 53 | 53 | 54 | 53 | 54 | 55 | 54 | 54 | 55 | 54 | 54 | 54 | 55 | 55 | 54 | 54 | 54 | 54 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 43 | 57 |
| 2 | 45 | 55 |
| 3 | 45 | 55 |
| 4 | 45 | 55 |
| 5 | 45 | 55 |
| 6 | 45 | 55 |
| 7 | 46 | 54 |
| 8 | 46 | 54 |
| 9 | 47 | 53 |
| 10 | 47 | 53 |
| 11 | 47 | 53 |
| 12 | 48 | 52 |
| 13 | 47 | 53 |
| 14 | 47 | 53 |
| 15 | 46 | 54 |
| 16 | 47 | 53 |
| 17 | 46 | 54 |
| 18 | 45 | 55 |
| 19 | 46 | 54 |
| 20 | 46 | 54 |
| 21 | 45 | 55 |
| 22 | 46 | 54 |
| 23 | 46 | 54 |
| 24 | 46 | 54 |
| 25 | 45 | 55 |
| 26 | 45 | 55 |
| 27 | 46 | 54 |
| 28 | 46 | 54 |
| 29 | 46 | 54 |
| 30 | 46 | 54 |
Chance of precipitation in April
Jōetsu gets around 97 mm of rain and snow over 13.4 wet days in April. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 45% and peaks near 54% on the wettest days, and about 0 day brings snow. 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 54 | 53 | 53 | 52 | 52 | 51 | 50 | 50 | 49 | 48 | 47 | 46 | 46 | 45 | 44 | 44 | 43 | 42 | 42 | 41 | 41 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 38 |
| Snow chance (%) | 8 | 7 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 54 | 8 |
| 2 | 53 | 7 |
| 3 | 53 | 6 |
| 4 | 52 | 5 |
| 5 | 52 | 4 |
| 6 | 51 | 4 |
| 7 | 50 | 3 |
| 8 | 50 | 3 |
| 9 | 49 | 2 |
| 10 | 48 | 2 |
| 11 | 47 | 1 |
| 12 | 46 | 1 |
| 13 | 46 | 1 |
| 14 | 45 | 1 |
| 15 | 44 | 1 |
| 16 | 44 | 1 |
| 17 | 43 | 1 |
| 18 | 42 | 1 |
| 19 | 42 | 1 |
| 20 | 41 | 0 |
| 21 | 41 | 0 |
| 22 | 40 | 0 |
| 23 | 40 | 0 |
| 24 | 40 | 0 |
| 25 | 40 | 0 |
| 26 | 40 | 0 |
| 27 | 39 | 0 |
| 28 | 39 | 0 |
| 29 | 39 | 0 |
| 30 | 38 | 0 |
Humidity in April
Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, April lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 97 | 97 | 96 | 95 | 95 | 94 | 93 | 92 | 90 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 | 5 | 5 | 6 | 7 | 8 | 9 |
| Humid (%) | 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 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 100 | 0 | 0 |
| 2 | 100 | 0 | 0 |
| 3 | 100 | 0 | 0 |
| 4 | 100 | 0 | 0 |
| 5 | 100 | 0 | 0 |
| 6 | 100 | 0 | 0 |
| 7 | 100 | 0 | 0 |
| 8 | 100 | 0 | 0 |
| 9 | 100 | 0 | 0 |
| 10 | 100 | 0 | 0 |
| 11 | 99 | 1 | 0 |
| 12 | 99 | 1 | 0 |
| 13 | 99 | 1 | 0 |
| 14 | 99 | 1 | 0 |
| 15 | 99 | 1 | 0 |
| 16 | 99 | 1 | 0 |
| 17 | 99 | 1 | 0 |
| 18 | 99 | 1 | 0 |
| 19 | 98 | 2 | 0 |
| 20 | 98 | 2 | 0 |
| 21 | 98 | 2 | 0 |
| 22 | 97 | 3 | 0 |
| 23 | 97 | 3 | 0 |
| 24 | 96 | 4 | 0 |
| 25 | 95 | 5 | 0 |
| 26 | 95 | 5 | 0 |
| 27 | 94 | 6 | 0 |
| 28 | 93 | 7 | 0 |
| 29 | 92 | 8 | 0 |
| 30 | 90 | 9 | 1 |
Wind in April
Winds average 12 km/h in April.
Across April, daily wind ranges from about 11 km/h on the calmest days to 13 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 13 | light breeze |
| 2 | 13 | light breeze |
| 3 | 13 | light breeze |
| 4 | 12 | light breeze |
| 5 | 12 | light breeze |
| 6 | 12 | light breeze |
| 7 | 12 | light breeze |
| 8 | 12 | light breeze |
| 9 | 12 | light breeze |
| 10 | 12 | light breeze |
| 11 | 12 | light breeze |
| 12 | 12 | light breeze |
| 13 | 12 | light breeze |
| 14 | 12 | light breeze |
| 15 | 12 | calm |
| 16 | 12 | calm |
| 17 | 12 | calm |
| 18 | 12 | calm |
| 19 | 12 | calm |
| 20 | 12 | calm |
| 21 | 12 | calm |
| 22 | 12 | calm |
| 23 | 12 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in April
Daylight runs from about 12 h 24 min at the start of April to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 66 minutes over April. Sunrise moves from 5:41 AM to 5:00 AM, and sunset from 6:02 PM to 6:29 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.4 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.4 | 13.4 | 13.4 | 13.5 |
| Sunrise (AM) | 5:41 | 5:39 | 5:38 | 5:36 | 5:35 | 5:33 | 5:32 | 5:30 | 5:29 | 5:27 | 5:26 | 5:24 | 5:23 | 5:22 | 5:20 | 5:19 | 5:17 | 5:16 | 5:15 | 5:13 | 5:12 | 5:10 | 5:09 | 5:08 | 5:06 | 5:05 | 5:04 | 5:03 | 5:01 | 5:00 |
| Sunset (PM) | 6:02 | 6:03 | 6:04 | 6:05 | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:19 | 6:19 | 6:20 | 6:21 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 5:41 | 6:02 |
| 2 | 12.4 | 5:39 | 6:03 |
| 3 | 12.4 | 5:38 | 6:04 |
| 4 | 12.5 | 5:36 | 6:05 |
| 5 | 12.5 | 5:35 | 6:06 |
| 6 | 12.6 | 5:33 | 6:07 |
| 7 | 12.6 | 5:32 | 6:08 |
| 8 | 12.6 | 5:30 | 6:09 |
| 9 | 12.7 | 5:29 | 6:10 |
| 10 | 12.7 | 5:27 | 6:10 |
| 11 | 12.8 | 5:26 | 6:11 |
| 12 | 12.8 | 5:24 | 6:12 |
| 13 | 12.8 | 5:23 | 6:13 |
| 14 | 12.9 | 5:22 | 6:14 |
| 15 | 12.9 | 5:20 | 6:15 |
| 16 | 13.0 | 5:19 | 6:16 |
| 17 | 13.0 | 5:17 | 6:17 |
| 18 | 13.0 | 5:16 | 6:18 |
| 19 | 13.1 | 5:15 | 6:19 |
| 20 | 13.1 | 5:13 | 6:19 |
| 21 | 13.1 | 5:12 | 6:20 |
| 22 | 13.2 | 5:10 | 6:21 |
| 23 | 13.2 | 5:09 | 6:22 |
| 24 | 13.3 | 5:08 | 6:23 |
| 25 | 13.3 | 5:06 | 6:24 |
| 26 | 13.3 | 5:05 | 6:25 |
| 27 | 13.4 | 5:04 | 6:26 |
| 28 | 13.4 | 5:03 | 6:27 |
| 29 | 13.4 | 5:01 | 6:28 |
| 30 | 13.5 | 5:00 | 6:29 |
Solar energy in April
Average shortwave solar energy reaching the ground each day in April, about 5.28 kWh/m².
For context, solar energy here swings from a low near 1.89 kWh/m² to a high of 5.79 kWh/m² in May across the year — April's 5.28 kWh/m² sits near the top of that range.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.9 | Bright |
| 2 | 4.9 | Bright |
| 3 | 4.9 | Bright |
| 4 | 5.0 | Bright |
| 5 | 5.0 | Bright |
| 6 | 5.0 | Bright |
| 7 | 5.1 | Bright |
| 8 | 5.1 | Bright |
| 9 | 5.1 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.2 | Bright |
| 14 | 5.3 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.3 | Bright |
| 17 | 5.3 | Bright |
| 18 | 5.3 | Bright |
| 19 | 5.3 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.5 | Bright |
| 25 | 5.5 | Bright |
| 26 | 5.5 | Bright |
| 27 | 5.5 | Bright |
| 28 | 5.6 | Bright |
| 29 | 5.6 | Bright |
| 30 | 5.6 | Bright |
Hazard calendar for Jōetsu
In April, Jōetsu sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Jōetsu sits in the Pacific typhoon belt; the season peaks July–October.
Is April a good time to visit Jōetsu?
Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
April is a reasonable time to visit Jōetsu for sightseeing.
What to pack for Jōetsu in April
From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In April, Jōetsu sees daytime highs around 15°C and nights near 8°C. Worth packing: a warm layer, rain gear and sun protection. About 13 days see rain.
Sea temperature near Jōetsu in April
The nearest coast averages about 11°C in April — 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 Jōetsu in April
Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Jōetsu peaks around August 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 | 4 | 7 | 8 | 9 | 9 | 10 | 9 | 5 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 10 | Very high |
| Sep | 9 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Air quality in Jōetsu in April
Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.
Air quality in Jōetsu is worst in April — around 22 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 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 | 22 | 20 | 17 | 15 | 12 | 10 | 10 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 20 | Moderate |
| Apr | 22 | Moderate |
| May | 20 | Moderate |
| Jun | 17 | Moderate |
| Jul | 15 | Moderate |
| Aug | 12 | Good |
| Sep | 10 | Good |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Jōetsu?
Jōetsu sits at 37.1°N, 138.2°E, 10 m above sea level, in Japan. The nearest listed city is Myoko, 14 km away.
Topography around Jōetsu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Jōetsu.
Within 3 km, the terrain around Jōetsu has only modest variations in elevation — a maximum elevation change of 177 m around an average of 22 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,200 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,900 m.
The land around Jōetsu is covered by artificial surfaces (46%), trees (24%) and cropland (20%) within 3 km, trees (39%) and water (32%) within 16 km, and trees (53%) and water (37%) 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 Jōetsu (37.1483°, 138.2364°, elevation 10 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).