Chiba climate
Chiba (Japan) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 16 °C60 °F, and about 1,694 mm67 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Chiba climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 948 | 133 | 541 | 803.2 | 12 |
| Feb | 1050 | 135 | 642 | 752.9 | 10 |
| Mar | 1457 | 440 | 948 | 1244.9 | 2 |
| Apr | 1865 | 948 | 1457 | 1355.3 | 0 |
| May | 2373 | 1457 | 1865 | 1485.8 | 0 |
| Jun | 2678 | 1865 | 2272 | 1857.3 | 0 |
| Jul | 2985 | 2272 | 2678 | 1526.0 | 0 |
| Aug | 3187 | 2374 | 2781 | 1345.3 | 0 |
| Sep | 2781 | 2069 | 2475 | 2118.3 | 0 |
| Oct | 2272 | 1558 | 1865 | 2469.7 | 0 |
| Nov | 1762 | 948 | 1355 | 1204.7 | 0 |
| Dec | 1253 | 338 | 846 | 833.3 | 2 |
| Year | 3187 | 133 | 1660 | 1,69467 | 26 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 75% | 66% | 2.5 | 9:00 |
| Feb | 76% | 72% | 3.0 | 10:51 |
| Mar | 76% | 71% | 3.8 | 11:52 |
| Apr | 77% | 70% | 4.6 | 13:03 |
| May | 79% | 72% | 5.0 | 14:02 |
| Jun | 82% | 81% | 4.6 | 14:33 |
| Jul | 83% | 75% | 4.9 | 14:20 |
| Aug | 81% | 61% | 5.2 | 13:29 |
| Sep | 82% | 71% | 3.9 | 12:21 |
| Oct | 82% | 73% | 2.9 | 11:13 |
| Nov | 80% | 71% | 2.4 | 10:14 |
| Dec | 78% | 66% | 2.2 | 9:46 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Chiba is like
The warmest month is August, with an average high of 31 °C87 °F and a low of 23 °C74 °F. The coldest is January, when highs average 9 °C48 °F and lows 1 °C33 °F. Seasons are strongly marked: the warmest month is on average 22.2 °C40 °F warmer than the coldest.
It is wet, with about 1,694 mm67 in of precipitation per year. The wettest three-month stretch is August–October, which brings 35% of the annual total. The wettest month is October (246 mm9.7 in), the driest is February (75 mm2.9 in).
Relative humidity ranges from 75% in January to 83% in July. The clearest skies (lowest average cloud amount, 61%) are typical of August. Average wind speed near the ground ranges from 8 km/h (5 mph) in June to 11 km/h (7 mph) in March. Daylight lasts from about 9.8 hours in December to 14.6 hours in June.
Best time to visit Chiba
Based on these averages, the most comfortable months for sightseeing and outdoor activities are April and May. Average highs then reach 18 °C65 °F to 23 °C73 °F. Precipitation is 135 mm5.3 in to 148 mm5.8 in per month.
The most challenging month is January, which is cold, with average highs of 9 °C48 °F.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Chiba
- Winter (December–February) — highs 948 to 12 °C53 °F, lows 133 to 3 °C38 °F, about 79 mm3.1 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Spring (March–May) — highs 1457 to 23 °C73 °F, lows 440 to 14 °C57 °F, about 136 mm5.3 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2678 to 31 °C87 °F, lows 1865 to 23 °C74 °F, about 157 mm6.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1762 to 27 °C81 °F, lows 948 to 20 °C69 °F, about 192 mm7.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Chiba compares
The nearest larger place is Tokyo, about 40 km to the west. Compared with it, Chiba has practically the same average temperature. It receives a similar amount of precipitation.
World Climates covers 111 places in Japan. By annual mean temperature, Chiba is the 42nd warmest of them. By annual precipitation, it is the 56th wettest. See all of them on the Japan climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are East Hampton (United States, Cfa), Norfolk (United States, Cfa) and Virginia Beach (United States, Cfa).
The same NASA POWER grid cell also contains Ichihara (pop. 283,531), Yachiyo (pop. 199,498), Narashino (pop. 176,197) and Sakura (pop. 173,740). Their long-term averages in this dataset are essentially the same as for Chiba, so they do not have separate pages.
Nearby places
- Climate in Narita 27 km · 16 °C60 °F · 1,543 mm61 in
- Climate in Abiko 31 km · 15 °C59 °F · 1,519 mm60 in
- Climate in Tokyo 40 km · 16 °C60 °F · 1,694 mm67 in
- Climate in Kawaguchi 43 km · 15 °C59 °F · 1,519 mm60 in
- Climate in Yokohama 46 km · 15 °C60 °F · 1,636 mm64 in
- Climate in Tsukuba 54 km · 15 °C59 °F · 1,519 mm60 in
- Climate in Saitama 54 km · 15 °C59 °F · 1,449 mm57 in
- Climate in Koga 74 km · 15 °C59 °F · 1,519 mm60 in
Frequently asked questions
What is the warmest month in Chiba?
August is the warmest month in Chiba. Its average high is 31 °C (87 °F) and its average low is 23 °C (74 °F).
What is the coldest month in Chiba?
January is the coldest month. Its average high is 9 °C (48 °F) and its average low is 1 °C (33 °F).
When does it rain the most in Chiba?
October is the wettest month with about 246 mm (9.7 in) of precipitation. February is the driest with about 75 mm (2.9 in).
What is the best time to visit Chiba?
Judging by long-term averages, the most comfortable months are April and May.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.