Isumi weather in November
In November, Isumi sees average daytime highs of 17°C and overnight lows near 14°C, with 147 mm of rain across 13.4 wet days and about 10.1 hours of daylight. It is the 7th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 19°C in the first days to 16°C by the end. The sky is clear or mostly clear about 37% of the time in November, and the air most often feels dry.
Daylight stretches from about 10 h 30 min at the start of November to 9 h 48 min by month's end. Set against the rest of the year, November is Isumi's 4th-clearest and 8th-windiest month. For the whole year in context, see Isumi's year-round climate.
- Daytime high
- 17°
- 7th warmest
- Overnight low
- 14°
- 6th coldest
- Rainfall
- 147 mm
- 13.4 wet days
- Daylight
- 10 h 06 min
- 6:20 AM – 4:27 PM
- Cloud cover
- 56%
- 4th clearest
- Wind
- 18 km/h
- 8th windiest
- Solar energy
- 2.43 kWh/m²
- Travel score
- 5.2
- out of 10
Isumi is city in Chiba Prefecture, Japan.
- Density
- 226/km²
- people per km²
- Founded
- 2005
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in November
Highs ease over the month, from about 19°C in the first days to 16°C by the end.
A typical November day in Isumi reaches about 17°C in the afternoon and slips back to 14°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 20°C. Set against its neighbours, November runs about 4°C cooler than October and about 4°C warmer than December.
| 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) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 |
| Avg low (°C) | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 19 | 16 |
| 2 | 19 | 16 |
| 3 | 19 | 16 |
| 4 | 19 | 16 |
| 5 | 19 | 16 |
| 6 | 19 | 16 |
| 7 | 19 | 15 |
| 8 | 18 | 15 |
| 9 | 18 | 15 |
| 10 | 18 | 15 |
| 11 | 18 | 15 |
| 12 | 18 | 15 |
| 13 | 18 | 15 |
| 14 | 18 | 14 |
| 15 | 17 | 14 |
| 16 | 17 | 14 |
| 17 | 17 | 14 |
| 18 | 17 | 14 |
| 19 | 17 | 13 |
| 20 | 17 | 13 |
| 21 | 17 | 13 |
| 22 | 16 | 13 |
| 23 | 16 | 13 |
| 24 | 16 | 13 |
| 25 | 16 | 13 |
| 26 | 16 | 12 |
| 27 | 16 | 12 |
| 28 | 16 | 12 |
| 29 | 15 | 12 |
| 30 | 15 | 12 |
Isumi weather by month
How November compares with the rest of the year at a glance. November is the 7th-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 10° / 7° | 108 | 10.7 | 9.9 | 2.5 |
| Feb | 11° / 6° | 101 | 10.6 | 10.7 | 2.4 |
| Mar | 13° / 9° | 159 | 14.6 | 11.7 | 3.2 |
| Apr | 16° / 13° | 126 | 12.6 | 12.9 | 4.8 |
| May | 20° / 17° | 138 | 11.8 | 13.8 | 5.9 |
| Jun | 23° / 20° | 190 | 13.5 | 14.3 | 5.8 |
| Jul | 26° / 24° | 133 | 11.8 | 14.1 | 6.2 |
| Aug | 28° / 25° | 100 | 11 | 13.3 | 6.2 |
| Sep | 25° / 23° | 188 | 14.7 | 12.2 | 5.9 |
| Oct | 21° / 19° | 239 | 14.9 | 11.1 | 5.8 |
| Nov | 17° / 14° | 147 | 13.4 | 10.1 | 5.2 |
| Dec | 13° / 9° | 106 | 11.7 | 9.7 | 3.6 |
Cloud cover in November
The sky is clear or mostly clear about 37% of the time in November.
Beyond those clear spells, partly cloudy skies cover about 15% of November, with mostly cloudy or overcast conditions the remaining 49%.
| 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 (%) | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 | 51 | 52 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 52 |
| Cloudier (%) | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 | 48 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 48 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 52 | 48 |
| 3 | 52 | 48 |
| 4 | 51 | 49 |
| 5 | 51 | 49 |
| 6 | 51 | 49 |
| 7 | 51 | 49 |
| 8 | 51 | 49 |
| 9 | 51 | 49 |
| 10 | 52 | 48 |
| 11 | 51 | 49 |
| 12 | 51 | 49 |
| 13 | 51 | 49 |
| 14 | 51 | 49 |
| 15 | 52 | 48 |
| 16 | 52 | 48 |
| 17 | 52 | 48 |
| 18 | 51 | 49 |
| 19 | 51 | 49 |
| 20 | 51 | 49 |
| 21 | 51 | 49 |
| 22 | 51 | 49 |
| 23 | 50 | 50 |
| 24 | 50 | 50 |
| 25 | 51 | 49 |
| 26 | 51 | 49 |
| 27 | 51 | 49 |
| 28 | 51 | 49 |
| 29 | 51 | 49 |
| 30 | 52 | 48 |
Chance of precipitation in November
Isumi gets around 147 mm of rain over 13.4 wet days in November. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 45% and peaks near 48% 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 (%) | 43 | 43 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 43 | 43 | 44 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 47 | 47 | 47 |
| Rain chance (%) | |
|---|---|
| 1 | 43 |
| 2 | 43 |
| 3 | 42 |
| 4 | 42 |
| 5 | 42 |
| 6 | 42 |
| 7 | 42 |
| 8 | 42 |
| 9 | 42 |
| 10 | 42 |
| 11 | 42 |
| 12 | 43 |
| 13 | 43 |
| 14 | 44 |
| 15 | 45 |
| 16 | 45 |
| 17 | 46 |
| 18 | 46 |
| 19 | 46 |
| 20 | 47 |
| 21 | 47 |
| 22 | 47 |
| 23 | 47 |
| 24 | 48 |
| 25 | 48 |
| 26 | 48 |
| 27 | 48 |
| 28 | 47 |
| 29 | 47 |
| 30 | 47 |
Humidity in November
Most of November feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, November lands in the dry band about 74% 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 (%) | 50 | 52 | 53 | 55 | 57 | 59 | 60 | 62 | 63 | 65 | 67 | 70 | 72 | 73 | 75 | 77 | 79 | 80 | 82 | 83 | 83 | 85 | 86 | 88 | 88 | 89 | 90 | 90 | 91 | 91 |
| Comfortable (%) | 32 | 31 | 30 | 29 | 28 | 27 | 27 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 18 | 16 | 15 | 14 | 13 | 12 | 12 | 11 | 10 | 9 | 9 | 8 | 8 | 8 | 7 | 7 |
| Humid (%) | 17 | 16 | 16 | 15 | 14 | 13 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 50 | 32 | 17 | 1 |
| 2 | 52 | 31 | 16 | 1 |
| 3 | 53 | 30 | 16 | 1 |
| 4 | 55 | 29 | 15 | 1 |
| 5 | 57 | 28 | 14 | 1 |
| 6 | 59 | 27 | 13 | 1 |
| 7 | 60 | 27 | 12 | 1 |
| 8 | 62 | 26 | 11 | 1 |
| 9 | 63 | 25 | 11 | 1 |
| 10 | 65 | 24 | 10 | 1 |
| 11 | 67 | 23 | 9 | 1 |
| 12 | 70 | 21 | 9 | 0 |
| 13 | 72 | 20 | 8 | 0 |
| 14 | 73 | 19 | 8 | 0 |
| 15 | 75 | 18 | 7 | 0 |
| 16 | 77 | 16 | 7 | 0 |
| 17 | 79 | 15 | 6 | 0 |
| 18 | 80 | 14 | 6 | 0 |
| 19 | 82 | 13 | 5 | 0 |
| 20 | 83 | 12 | 5 | 0 |
| 21 | 83 | 12 | 5 | 0 |
| 22 | 85 | 11 | 4 | 0 |
| 23 | 86 | 10 | 4 | 0 |
| 24 | 88 | 9 | 3 | 0 |
| 25 | 88 | 9 | 3 | 0 |
| 26 | 89 | 8 | 3 | 0 |
| 27 | 90 | 8 | 2 | 0 |
| 28 | 90 | 8 | 2 | 0 |
| 29 | 91 | 7 | 2 | 0 |
| 30 | 91 | 7 | 2 | 0 |
Wind in November
Winds average 18 km/h in November.
Across November, daily wind ranges from about 18 km/h on the calmest days to 19 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) | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 |
| 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 | 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 | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 18 | light breeze |
| 2 | 18 | light breeze |
| 3 | 18 | light breeze |
| 4 | 18 | light breeze |
| 5 | 18 | light breeze |
| 6 | 18 | light breeze |
| 7 | 18 | light breeze |
| 8 | 18 | light breeze |
| 9 | 18 | light breeze |
| 10 | 18 | light breeze |
| 11 | 18 | light breeze |
| 12 | 18 | light breeze |
| 13 | 18 | light breeze |
| 14 | 18 | light breeze |
| 15 | 19 | light breeze |
| 16 | 19 | light breeze |
| 17 | 19 | light breeze |
| 18 | 19 | light breeze |
| 19 | 19 | light breeze |
| 20 | 19 | light breeze |
| 21 | 19 | light breeze |
| 22 | 19 | light breeze |
| 23 | 19 | light breeze |
| 24 | 19 | light breeze |
| 25 | 19 | light breeze |
| 26 | 19 | light breeze |
| 27 | 19 | light breeze |
| 28 | 19 | light breeze |
| 29 | 19 | light breeze |
| 30 | 19 | light breeze |
Sunrise & sunset in November
Daylight runs from about 10 h 30 min at the start of November to 9 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 42 minutes over November. Sunrise moves from 6:05 AM to 6:33 AM, and sunset from 4:38 PM to 4:22 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) | 10.5 | 10.5 | 10.5 | 10.5 | 10.4 | 10.4 | 10.4 | 10.3 | 10.3 | 10.3 | 10.2 | 10.2 | 10.2 | 10.2 | 10.1 | 10.1 | 10.1 | 10.1 | 10.0 | 10.0 | 10.0 | 10.0 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.9 | 9.8 | 9.8 |
| Sunrise (AM) | 6:05 | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:19 | 6:20 | 6:21 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:32 | 6:33 |
| Sunset (PM) | 4:38 | 4:37 | 4:37 | 4:36 | 4:35 | 4:34 | 4:33 | 4:32 | 4:32 | 4:31 | 4:30 | 4:30 | 4:29 | 4:28 | 4:28 | 4:27 | 4:27 | 4:26 | 4:26 | 4:25 | 4:25 | 4:24 | 4:24 | 4:24 | 4:23 | 4:23 | 4:23 | 4:23 | 4:22 | 4:22 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.5 | 6:05 | 4:38 |
| 2 | 10.5 | 6:06 | 4:37 |
| 3 | 10.5 | 6:07 | 4:37 |
| 4 | 10.5 | 6:08 | 4:36 |
| 5 | 10.4 | 6:09 | 4:35 |
| 6 | 10.4 | 6:10 | 4:34 |
| 7 | 10.4 | 6:11 | 4:33 |
| 8 | 10.3 | 6:12 | 4:32 |
| 9 | 10.3 | 6:13 | 4:32 |
| 10 | 10.3 | 6:14 | 4:31 |
| 11 | 10.2 | 6:15 | 4:30 |
| 12 | 10.2 | 6:16 | 4:30 |
| 13 | 10.2 | 6:17 | 4:29 |
| 14 | 10.2 | 6:18 | 4:28 |
| 15 | 10.1 | 6:19 | 4:28 |
| 16 | 10.1 | 6:20 | 4:27 |
| 17 | 10.1 | 6:21 | 4:27 |
| 18 | 10.1 | 6:22 | 4:26 |
| 19 | 10.0 | 6:23 | 4:26 |
| 20 | 10.0 | 6:24 | 4:25 |
| 21 | 10.0 | 6:25 | 4:25 |
| 22 | 10.0 | 6:26 | 4:24 |
| 23 | 9.9 | 6:27 | 4:24 |
| 24 | 9.9 | 6:28 | 4:24 |
| 25 | 9.9 | 6:29 | 4:23 |
| 26 | 9.9 | 6:30 | 4:23 |
| 27 | 9.9 | 6:31 | 4:23 |
| 28 | 9.9 | 6:32 | 4:23 |
| 29 | 9.8 | 6:32 | 4:22 |
| 30 | 9.8 | 6:33 | 4:22 |
Solar energy in November
Average shortwave solar energy reaching the ground each day in November, about 2.43 kWh/m².
For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 5.53 kWh/m² in August across the year — November's 2.43 kWh/m² sits near the bottom.
| 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) | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.6 | 2.6 | 2.6 | 2.5 | 2.5 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 |
| 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 | 2.8 | Moderate |
| 2 | 2.8 | Moderate |
| 3 | 2.8 | Moderate |
| 4 | 2.7 | Moderate |
| 5 | 2.7 | Moderate |
| 6 | 2.7 | Moderate |
| 7 | 2.6 | Moderate |
| 8 | 2.6 | Moderate |
| 9 | 2.6 | Moderate |
| 10 | 2.5 | Moderate |
| 11 | 2.5 | Moderate |
| 12 | 2.5 | Moderate |
| 13 | 2.5 | Moderate |
| 14 | 2.4 | Moderate |
| 15 | 2.4 | Moderate |
| 16 | 2.4 | Moderate |
| 17 | 2.4 | Moderate |
| 18 | 2.4 | Moderate |
| 19 | 2.3 | Moderate |
| 20 | 2.3 | Moderate |
| 21 | 2.3 | Moderate |
| 22 | 2.3 | Moderate |
| 23 | 2.3 | Moderate |
| 24 | 2.2 | Moderate |
| 25 | 2.2 | Moderate |
| 26 | 2.2 | Moderate |
| 27 | 2.2 | Moderate |
| 28 | 2.2 | Moderate |
| 29 | 2.2 | Moderate |
| 30 | 2.2 | Moderate |
Hazard calendar for Isumi
In November, Isumi sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Isumi sits in the Pacific typhoon belt; the season peaks July–October.
Is November a good time to visit Isumi?
Our two travel scores rate November for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
November is a reasonable time to visit Isumi for sightseeing.
What to pack for Isumi in November
From November's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In November, Isumi sees daytime highs around 17°C and nights near 14°C. Worth packing: rain gear. About 13 days see rain.
Sea temperature near Isumi in November
The nearest coast averages about 22°C in November — 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 26°C and coldest in February near 16°C.
It's comfortable for a long swim from May 22 to Dec 9 — about 6.6 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 18 | 16 | 16 | 18 | 20 | 22 | 24 | 26 | 26 | 24 | 22 | 20 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 18 | Cool |
| Feb | 16 | Cool |
| Mar | 16 | Cool |
| Apr | 18 | Cool |
| May | 20 | Cool |
| Jun | 22 | Refreshing |
| Jul | 24 | Refreshing |
| Aug | 26 | Warm |
| Sep | 26 | Warm |
| Oct | 24 | Refreshing |
| Nov | 22 | Refreshing |
| Dec | 20 | Cool |
UV index in Isumi in November
Clear-sky midday UV in November peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Isumi peaks around August 11 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 7 | 9 | 9 | 10 | 10 | 8 | 6 | 4 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 9 | Very high |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Isumi in November
Average fine-particle pollution (PM2.5) through the year — so you can see where November falls, not just the annual average.
Air quality in Isumi is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (September, 11 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) | 14 | 17 | 21 | 22 | 21 | 16 | 12 | 11 | 11 | 14 | 14 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 17 | Moderate |
| Mar | 21 | Moderate |
| Apr | 22 | Moderate |
| May | 21 | Moderate |
| Jun | 16 | Moderate |
| Jul | 12 | Good |
| Aug | 11 | Good |
| Sep | 11 | Good |
| Oct | 14 | Moderate |
| Nov | 14 | Moderate |
| Dec | 13 | Moderate |
Where is Isumi?
Isumi sits at 35.2°N, 140.4°E, 1 m above sea level, in Japan. The nearest listed city is Ōhara, 2.0 km away.
Topography around Isumi
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Isumi.
Within 3 km, the terrain around Isumi has only modest variations in elevation — a maximum elevation change of 86 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 229 m; within 80 km, significant variations in elevation — a maximum elevation change of 396 m.
The land around Isumi is covered by water (59%) and trees (27%) within 3 km, water (62%) and trees (27%) within 16 km, and water (55%) and trees (21%) 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 Isumi (35.23°, 140.4049°, elevation 1 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).