Inzai, Chiba Weather by Month and Climate Averages

Inzai, Chiba gets 1299 mm of precipitation a year over about 98 rainy days. August is the warmest month (average high 31°C) and January the coldest (average low 2°C).

Inzai climate at a glance

Humid subtropical climate

Inzai, Chiba has hot summers and chilly winters. Daytime highs range from about 10°C in January to 31°C in August. September is usually the wettest month. The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.

How much rain does Inzai get?

Inzai gets 1299 mm of precipitation in an average year, spread over about 98 days with measurable rain. That is fewer rainy days than 81% of Japan.

September is the wettest month, with 198 mm. December is the driest, with 51 mm. June has the most rainy days, about 11.

The longest dry spell in the last five years lasted 25 days, to February 5, 2022.

Inzai weather by month

Inzai weather in January

In January, Inzai averages a high of 10°C and a low of 2°C. It gets 59 mm of precipitation over about 5 rainy days. The sun is out about 56% of daylight hours. The January record high is 19°C (1989) and the record low is -5°C (1981).

Inzai weather in February

In February, Inzai averages a high of 11°C and a low of 2°C. It gets 55 mm of precipitation over about 6 rainy days. The sun is out about 54% of daylight hours. The February record high is 24°C (2009) and the record low is -4°C (1977).

Inzai weather in March

In March, Inzai averages a high of 14°C and a low of 5°C. It gets 97 mm of precipitation over about 9 rainy days. The sun is out about 40% of daylight hours. The March record high is 26°C (2013) and the record low is -4°C (1977).

Inzai weather in April

In April, Inzai averages a high of 19°C and a low of 10°C. It gets 101 mm of precipitation over about 9 rainy days. The sun is out about 38% of daylight hours. The April record high is 29°C (2004) and the record low is 1°C (2001). April is one of the most comfortable months to visit.

Inzai weather in May

In May, Inzai averages a high of 23°C and a low of 15°C. It gets 108 mm of precipitation over about 9 rainy days. The sun is out about 28% of daylight hours. The May record high is 32°C (2026) and the record low is 7°C (1993). May is one of the most comfortable months to visit.

Inzai weather in June

In June, Inzai averages a high of 26°C and a low of 19°C. It gets 141 mm of precipitation over about 11 rainy days. The sun is out about 22% of daylight hours. The June record high is 37°C (2022) and the record low is 11°C (1981). June is one of the most comfortable months to visit.

Inzai weather in July

In July, Inzai averages a high of 29°C and a low of 23°C. It gets 118 mm of precipitation over about 10 rainy days. The sun is out about 28% of daylight hours. The July record high is 38°C (2004) and the record low is 12°C (1976).

Inzai weather in August

In August, Inzai averages a high of 31°C and a low of 24°C. It gets 101 mm of precipitation over about 8 rainy days. The sun is out about 41% of daylight hours. The August record high is 38°C (2015) and the record low is 17°C (1980).

Inzai weather in September

In September, Inzai averages a high of 28°C and a low of 21°C. It gets 198 mm of precipitation over about 10 rainy days. The sun is out about 32% of daylight hours. The September record high is 36°C (2010) and the record low is 13°C (2003).

Inzai weather in October

In October, Inzai averages a high of 22°C and a low of 15°C. It gets 187 mm of precipitation over about 9 rainy days. The sun is out about 40% of daylight hours. The October record high is 33°C (2016) and the record low is 6°C (1983). October is one of the most comfortable months to visit.

Inzai weather in November

In November, Inzai averages a high of 17°C and a low of 9°C. It gets 83 mm of precipitation over about 7 rainy days. The sun is out about 53% of daylight hours. The November record high is 28°C (2023) and the record low is 0°C (1971). November is one of the most comfortable months to visit.

Inzai weather in December

In December, Inzai averages a high of 13°C and a low of 4°C. It gets 51 mm of precipitation over about 6 rainy days. The sun is out about 61% of daylight hours. The December record high is 24°C (2023) and the record low is -3°C (1984).

Sunshine, humidity and wind in Inzai

December is the sunniest month in Inzai, with sunshine about 61% of daylight hours. June is the cloudiest, at 22%. Over the year the sun shines about 41% of daylight hours. Inzai is sunnier than 70% of Japan.

Humidity peaks in September at 80% and is lowest in February at 62%.

Inzai has about 18 days a year above 32°C. Inzai is cooler than 55% of Japan.

First and last freeze in Inzai

The first fall freeze in Inzai typically comes around December 18, and the last spring freeze around February 18. That leaves a frost-free growing season of about 303 days.

Inzai weather records

The hottest temperature on record at the Inzai station is 38°C, on August 7, 2015. The coldest is -5°C, on January 17, 1970.

The wettest day on record brought 260 mm of rain, on September 22, 1996.

48 all-time records have been set at the station since 1970.

The best time to visit Inzai

The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.

Winter (December–February) is chilly, with average highs around 11°C and lows near 3°C.

Spring (March–May) is mild, with average highs around 19°C and lows near 10°C.

Summer (June–August) is hot, with average highs around 29°C and lows near 22°C. It can feel humid.

Autumn (September–November) is warm, with average highs around 22°C and lows near 15°C.

Monthly climate

MonthPrecipRain daysHumiditySunshineSea tempRecord highRecord low
January59 mm565%56%-9°19°-5°
February55 mm662%54%-10°24°-4°
March97 mm967%40%-10°26°-4°
April101 mm967%38%-9°29°
May108 mm972%28%-8°32°
June141 mm1178%22%-6°37°11°
July118 mm1079%28%-4°38°12°
August101 mm878%41%-3°38°17°
September198 mm1080%32%-4°36°13°
October187 mm976%40%-6°33°
November83 mm772%53%-7°28°
December51 mm666%61%-8°24°-3°

From ERA5 reanalysis. Sunshine is estimated from cloud cover.

Inzai climate questions

How much rain does Inzai get?

Inzai gets 1299 mm of precipitation in an average year, over about 98 rainy days.

What is the wettest month in Inzai?

September is the wettest month in Inzai, with 198 mm. December is the driest, with 51 mm.

How many rainy days does Inzai have a year?

Inzai has about 98 days with measurable rain in an average year. June has the most, about 11.

What is the hottest month in Inzai?

August is the warmest month in Inzai, with an average high of 31°C.

What is the coldest month in Inzai?

January is the coldest month in Inzai, with an average low of 2°C.

What is the record high temperature in Inzai?

The record high at the Inzai station is 38°C, set on August 7, 2015. The record low is -5°C, on January 17, 1970.

What is the sunniest month in Inzai?

December is the sunniest month in Inzai, with sunshine about 61% of daylight hours. June is the cloudiest.

When is the first frost in Inzai?

The first fall freeze in Inzai typically comes around December 18. The last spring freeze is around February 18.

What is the best time to visit Inzai?

The most comfortable time to visit is typically April to June and October to November, when daytime highs sit near 22°C.

Source: NOAA GHCN-Daily station CHIBA (27 km away).

GraySky app icon
GraySky on your iPhone
See the forecast and climate for Inzai, Chiba.
App Store

Normals from NOAA GHCN-Daily station CHIBA.