Yamagata weather in September
In September, Yamagata sees average daytime highs of 23°C and overnight lows near 16°C, with 126 mm of rain across 13 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 25°C in the first days to 20°C by the end. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels humid.
Daylight stretches from about 12 h 54 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Yamagata's 7th-clearest and 10th-windiest month. For the whole year in context, see Yamagata's year-round climate.
- Daytime high
- 23°
- 3rd warmest
- Overnight low
- 16°
- 10th coldest
- Rainfall
- 126 mm
- 13 wet days
- Daylight
- 12 h 12 min
- 5:26 AM – 5:40 PM
- Cloud cover
- 72%
- 7th clearest
- Wind
- 6 km/h
- 10th windiest
- Solar energy
- 3.51 kWh/m²
- Travel score
- 5.9
- out of 10
Temperature in September
Highs ease over the month, from about 25°C in the first days to 20°C by the end.
A typical September day in Yamagata reaches about 23°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 6°C warmer than October.
| 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) | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 |
| Avg low (°C) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 18 |
| 2 | 25 | 18 |
| 3 | 25 | 18 |
| 4 | 25 | 18 |
| 5 | 25 | 18 |
| 6 | 25 | 18 |
| 7 | 25 | 18 |
| 8 | 25 | 17 |
| 9 | 24 | 17 |
| 10 | 24 | 17 |
| 11 | 24 | 17 |
| 12 | 24 | 17 |
| 13 | 24 | 16 |
| 14 | 23 | 16 |
| 15 | 23 | 16 |
| 16 | 23 | 16 |
| 17 | 23 | 15 |
| 18 | 23 | 15 |
| 19 | 22 | 15 |
| 20 | 22 | 14 |
| 21 | 22 | 14 |
| 22 | 22 | 14 |
| 23 | 21 | 14 |
| 24 | 21 | 13 |
| 25 | 21 | 13 |
| 26 | 21 | 13 |
| 27 | 21 | 13 |
| 28 | 20 | 13 |
| 29 | 20 | 12 |
| 30 | 20 | 12 |
How September really feels in Yamagata
Once humidity and wind are folded in, September 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.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Yamagata weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 1° / -5° | 126 | 21.7 | 23.1 | 9.6 | 0.0 |
| Feb | 2° / -5° | 90 | 17.9 | 18.2 | 10.5 | 0.0 |
| Mar | 6° / -2° | 109 | 16.9 | 12.2 | 11.7 | 0.5 |
| Apr | 13° / 3° | 94 | 13.7 | 2.7 | 13 | 3.3 |
| May | 19° / 9° | 91 | 12 | 0 | 14 | 5.6 |
| Jun | 22° / 15° | 119 | 12.5 | 0 | 14.6 | 6.0 |
| Jul | 26° / 19° | 189 | 17.4 | 0 | 14.4 | 5.4 |
| Aug | 27° / 20° | 147 | 14.8 | 0 | 13.5 | 5.6 |
| Sep | 23° / 16° | 126 | 13 | 0 | 12.3 | 5.9 |
| Oct | 17° / 9° | 118 | 12.4 | 0 | 11 | 5.0 |
| Nov | 11° / 3° | 95 | 15.3 | 4.1 | 9.9 | 2.2 |
| Dec | 4° / -2° | 120 | 20 | 16.3 | 9.4 | 0.1 |
Cloud cover in September
The sky is clear or mostly clear about 15% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 67%.
| 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 (%) | 32 | 33 | 33 | 32 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 33 | 33 | 32 | 31 | 31 | 31 | 31 | 32 | 33 | 33 | 32 | 33 | 34 | 34 |
| Cloudier (%) | 68 | 67 | 67 | 68 | 66 | 66 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 68 | 67 | 67 | 68 | 69 | 69 | 69 | 69 | 68 | 67 | 67 | 68 | 67 | 66 | 66 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 32 | 68 |
| 2 | 33 | 67 |
| 3 | 33 | 67 |
| 4 | 32 | 68 |
| 5 | 34 | 66 |
| 6 | 34 | 66 |
| 7 | 33 | 67 |
| 8 | 33 | 67 |
| 9 | 33 | 67 |
| 10 | 33 | 67 |
| 11 | 33 | 67 |
| 12 | 33 | 67 |
| 13 | 33 | 67 |
| 14 | 33 | 67 |
| 15 | 33 | 67 |
| 16 | 32 | 68 |
| 17 | 33 | 67 |
| 18 | 33 | 67 |
| 19 | 32 | 68 |
| 20 | 31 | 69 |
| 21 | 31 | 69 |
| 22 | 31 | 69 |
| 23 | 31 | 69 |
| 24 | 32 | 68 |
| 25 | 33 | 67 |
| 26 | 33 | 67 |
| 27 | 32 | 68 |
| 28 | 33 | 67 |
| 29 | 34 | 66 |
| 30 | 34 | 66 |
Chance of precipitation in September
Yamagata gets around 126 mm of rain over 13 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 44% and peaks near 46% on the wettest days.
| 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 (%) | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 45 | 45 | 45 | 44 | 44 | 43 | 43 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 42 |
| Rain chance (%) | |
|---|---|
| 1 | 46 |
| 2 | 46 |
| 3 | 46 |
| 4 | 46 |
| 5 | 46 |
| 6 | 46 |
| 7 | 46 |
| 8 | 46 |
| 9 | 46 |
| 10 | 46 |
| 11 | 46 |
| 12 | 46 |
| 13 | 46 |
| 14 | 45 |
| 15 | 45 |
| 16 | 45 |
| 17 | 44 |
| 18 | 44 |
| 19 | 43 |
| 20 | 43 |
| 21 | 42 |
| 22 | 42 |
| 23 | 42 |
| 24 | 42 |
| 25 | 42 |
| 26 | 42 |
| 27 | 42 |
| 28 | 43 |
| 29 | 43 |
| 30 | 42 |
Humidity in September
Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the humid band about 29% of days. Sticky, muggy-or-worse air turns up on roughly 26% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 1 | 2 | 2 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 10 | 11 | 13 | 15 | 18 | 20 | 22 | 25 | 28 | 30 | 33 | 35 | 37 | 40 | 42 | 44 | 47 | 49 | 51 |
| Comfortable (%) | 12 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 21 | 22 | 23 | 24 | 25 | 26 | 28 | 29 | 30 | 30 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 33 |
| Humid (%) | 33 | 34 | 34 | 35 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 34 | 34 | 33 | 32 | 31 | 29 | 28 | 27 | 25 | 24 | 22 | 21 | 19 | 18 | 17 | 15 | 14 | 13 |
| Muggy (%) | 39 | 38 | 37 | 37 | 36 | 35 | 34 | 33 | 32 | 30 | 29 | 27 | 26 | 24 | 22 | 20 | 18 | 17 | 15 | 13 | 12 | 10 | 9 | 7 | 6 | 5 | 4 | 4 | 3 | 3 |
| Oppressive (%) | 15 | 14 | 13 | 12 | 10 | 9 | 9 | 8 | 7 | 6 | 6 | 5 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 |
| Miserable (%) | 1 | 1 | 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 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 12 | 33 | 39 | 15 | 1 |
| 2 | 1 | 12 | 34 | 38 | 14 | 1 |
| 3 | 2 | 13 | 34 | 37 | 13 | 1 |
| 4 | 2 | 14 | 35 | 37 | 12 | 0 |
| 5 | 2 | 15 | 36 | 36 | 10 | 0 |
| 6 | 3 | 16 | 36 | 35 | 9 | 0 |
| 7 | 4 | 17 | 36 | 34 | 9 | 0 |
| 8 | 5 | 18 | 36 | 33 | 8 | 0 |
| 9 | 6 | 19 | 36 | 32 | 7 | 0 |
| 10 | 7 | 21 | 36 | 30 | 6 | 0 |
| 11 | 8 | 22 | 36 | 29 | 6 | 0 |
| 12 | 10 | 23 | 35 | 27 | 5 | 0 |
| 13 | 11 | 24 | 34 | 26 | 4 | 0 |
| 14 | 13 | 25 | 34 | 24 | 4 | 0 |
| 15 | 15 | 26 | 33 | 22 | 3 | 0 |
| 16 | 18 | 28 | 32 | 20 | 3 | 0 |
| 17 | 20 | 29 | 31 | 18 | 2 | 0 |
| 18 | 22 | 30 | 29 | 17 | 2 | 0 |
| 19 | 25 | 30 | 28 | 15 | 2 | 0 |
| 20 | 28 | 31 | 27 | 13 | 2 | 0 |
| 21 | 30 | 32 | 25 | 12 | 1 | 0 |
| 22 | 33 | 32 | 24 | 10 | 1 | 0 |
| 23 | 35 | 33 | 22 | 9 | 1 | 0 |
| 24 | 37 | 33 | 21 | 7 | 1 | 0 |
| 25 | 40 | 34 | 19 | 6 | 1 | 0 |
| 26 | 42 | 34 | 18 | 5 | 1 | 0 |
| 27 | 44 | 34 | 17 | 4 | 1 | 0 |
| 28 | 47 | 34 | 15 | 4 | 0 | 0 |
| 29 | 49 | 34 | 14 | 3 | 0 | 0 |
| 30 | 51 | 33 | 13 | 3 | 0 | 0 |
Wind in September
Winds average 6 km/h in September.
Across September, 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 54 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 72 minutes over September. Sunrise moves from 5:12 AM to 5:38 AM, and sunset from 6:04 PM to 5:17 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) | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.7 |
| Sunrise (AM) | 5:12 | 5:13 | 5:14 | 5:15 | 5:16 | 5:17 | 5:18 | 5:18 | 5:19 | 5:20 | 5:21 | 5:22 | 5:23 | 5:24 | 5:25 | 5:26 | 5:26 | 5:27 | 5:28 | 5:29 | 5:30 | 5:31 | 5:32 | 5:33 | 5:34 | 5:35 | 5:36 | 5:36 | 5:37 | 5:38 |
| Sunset (PM) | 6:04 | 6:03 | 6:01 | 6:00 | 5:58 | 5:56 | 5:55 | 5:53 | 5:52 | 5:50 | 5:48 | 5:47 | 5:45 | 5:43 | 5:42 | 5:40 | 5:39 | 5:37 | 5:35 | 5:34 | 5:32 | 5:30 | 5:29 | 5:27 | 5:25 | 5:24 | 5:22 | 5:21 | 5:19 | 5:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 5:12 | 6:04 |
| 2 | 12.8 | 5:13 | 6:03 |
| 3 | 12.8 | 5:14 | 6:01 |
| 4 | 12.7 | 5:15 | 6:00 |
| 5 | 12.7 | 5:16 | 5:58 |
| 6 | 12.7 | 5:17 | 5:56 |
| 7 | 12.6 | 5:18 | 5:55 |
| 8 | 12.6 | 5:18 | 5:53 |
| 9 | 12.5 | 5:19 | 5:52 |
| 10 | 12.5 | 5:20 | 5:50 |
| 11 | 12.5 | 5:21 | 5:48 |
| 12 | 12.4 | 5:22 | 5:47 |
| 13 | 12.4 | 5:23 | 5:45 |
| 14 | 12.3 | 5:24 | 5:43 |
| 15 | 12.3 | 5:25 | 5:42 |
| 16 | 12.2 | 5:26 | 5:40 |
| 17 | 12.2 | 5:26 | 5:39 |
| 18 | 12.2 | 5:27 | 5:37 |
| 19 | 12.1 | 5:28 | 5:35 |
| 20 | 12.1 | 5:29 | 5:34 |
| 21 | 12.0 | 5:30 | 5:32 |
| 22 | 12.0 | 5:31 | 5:30 |
| 23 | 11.9 | 5:32 | 5:29 |
| 24 | 11.9 | 5:33 | 5:27 |
| 25 | 11.9 | 5:34 | 5:25 |
| 26 | 11.8 | 5:35 | 5:24 |
| 27 | 11.8 | 5:36 | 5:22 |
| 28 | 11.7 | 5:36 | 5:21 |
| 29 | 11.7 | 5:37 | 5:19 |
| 30 | 11.7 | 5:38 | 5:17 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 3.51 kWh/m².
For context, solar energy here swings from a low near 1.85 kWh/m² to a high of 5.28 kWh/m² in May across the year — September's 3.51 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.8 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.2 | 3.2 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.8 | Moderate |
| 2 | 3.8 | Moderate |
| 3 | 3.8 | Moderate |
| 4 | 3.8 | Moderate |
| 5 | 3.7 | Moderate |
| 6 | 3.7 | Moderate |
| 7 | 3.7 | Moderate |
| 8 | 3.6 | Moderate |
| 9 | 3.6 | Moderate |
| 10 | 3.6 | Moderate |
| 11 | 3.6 | Moderate |
| 12 | 3.5 | Moderate |
| 13 | 3.5 | Moderate |
| 14 | 3.5 | Moderate |
| 15 | 3.5 | Moderate |
| 16 | 3.5 | Moderate |
| 17 | 3.4 | Moderate |
| 18 | 3.4 | Moderate |
| 19 | 3.4 | Moderate |
| 20 | 3.4 | Moderate |
| 21 | 3.4 | Moderate |
| 22 | 3.3 | Moderate |
| 23 | 3.3 | Moderate |
| 24 | 3.3 | Moderate |
| 25 | 3.3 | Moderate |
| 26 | 3.3 | Moderate |
| 27 | 3.2 | Moderate |
| 28 | 3.2 | Moderate |
| 29 | 3.2 | Moderate |
| 30 | 3.2 | Moderate |
Hazard calendar for Yamagata
In September, Yamagata sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Yamagata sits in the Pacific typhoon belt; the season peaks July–October.
Is September a good time to visit Yamagata?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Yamagata for sightseeing.
What to pack for Yamagata in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Yamagata sees daytime highs around 23°C and nights near 16°C. Worth packing: light clothes and rain gear. About 13 days see rain.
Sea temperature near Yamagata in September
The nearest coast averages about 23°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 67 km away) is warmest in August at about 24°C and coldest in March near 9°C.
It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 11 | 9 | 9 | 10 | 14 | 18 | 21 | 24 | 23 | 19 | 17 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 11 | Bracing |
| Feb | 9 | Bracing |
| Mar | 9 | Bracing |
| Apr | 10 | Bracing |
| May | 14 | Bracing |
| Jun | 18 | Cool |
| Jul | 21 | Refreshing |
| Aug | 24 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 17 | Cool |
| Dec | 14 | Bracing |
UV index in Yamagata in September
Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Yamagata peaks around August 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 8 | 8 | 8 | 9 | 8 | 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 | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 5 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Yamagata in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Yamagata is worst in April — around 22 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 | 21 | 22 | 21 | 16 | 14 | 12 | 12 | 12 | 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 | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 21 | Moderate |
| Jun | 16 | Moderate |
| Jul | 14 | Moderate |
| Aug | 12 | Moderate |
| Sep | 12 | Good |
| Oct | 12 | Good |
| Nov | 11 | Good |
| Dec | 10 | Good |
Where is Yamagata?
Yamagata sits at 38.2°N, 140.4°E, 321 m above sea level, in Japan. The nearest listed city is Kaminoyama, 12 km away.
Topography around Yamagata
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Yamagata.
Within 3 km, the terrain around Yamagata has large variations in elevation — a maximum elevation change of 600 m around an average of 312 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,754 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,110 m.
The land around Yamagata is covered by trees (65%) and artificial surfaces (32%) within 3 km, trees (73%) within 16 km, and trees (75%) 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 Yamagata (38.2333°, 140.3667°, elevation 321 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).