Isumi Climate by Month
Isumi, Chiba, Japan
Warm summers and cool winters, with rain spread through the year.
Warm summers and cool winters, with rain spread through the year: that's Isumi's climate in short. Expect highs of 85°F (29°C) in August and 51°F (11°C) in January, with the coldest nights (January) near 36°F (2°C). About 72 in (1822 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(29°C)
- Average high, August
- Coldest nights
- 36°F(2°C)
- Average low, January
- Rain per year
- 72 in(1822 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: August
Best and worst months in Isumi
Best for weatherMay to July are the best time for weather in Isumi: highs near 75°F (24°C) and about 6.6 in (167 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; February is the coldest, with highs of only 52°F (11°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Isumi weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 51°F(11°C) | 36°F(2°C) | 3.2 in(81 mm) | 62% | 2.6 |
| FebFebruary | 52°F(11°C) | 37°F(3°C) | 3.9 in(100 mm) | 61% | 3.1 |
| MarMarch | 57°F(14°C) | 42°F(6°C) | 6.0 in(153 mm) | 66% | 3.9 |
| AprApril | 64°F(18°C) | 51°F(11°C) | 5.4 in(137 mm) | 68% | 4.7 |
| MayMayBest | 70°F(21°C) | 58°F(15°C) | 6.3 in(161 mm) | 78% | 5.0 |
| JunJuneBest | 75°F(24°C) | 65°F(18°C) | 8.3 in(211 mm) | 85% | 4.5 |
| JulJulyBest | 81°F(27°C) | 71°F(22°C) | 5.0 in(128 mm) | 84% | 4.9 |
| AugAugust | 85°F(29°C) | 74°F(23°C) | 5.4 in(137 mm) | 82% | 5.2 |
| SepSeptember | 80°F(27°C) | 69°F(21°C) | 8.7 in(220 mm) | 79% | 3.9 |
| OctOctober | 72°F(22°C) | 60°F(16°C) | 9.9 in(252 mm) | 73% | 3.0 |
| NovNovember | 64°F(18°C) | 51°F(10°C) | 5.8 in(148 mm) | 69% | 2.4 |
| DecDecember | 56°F(13°C) | 41°F(5°C) | 3.7 in(94 mm) | 61% | 2.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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