Tachikawa

Planning your day in Tachikawa? Here you will find the most up-to-date information on weather conditions, including detailed forecasts and helpful charts.

The climate in Tachikawa, Japan, can be described as temperate with four distinct seasons. The city experiences significant temperature fluctuations throughout the year, allowing visitors to enjoy the unique charms of each season.

Winters in Tachikawa (December–February) are quite cool, with average temperatures around 3–6°C, occasionally dropping below freezing, especially in January. Spring (March–May) brings gradual warming, with average temperatures rising from 9°C in March to a comfortable 17–18°C in May. Summer (June–August) is warm and humid, with average temperatures between 20–26°C, with July and August being the hottest months. Autumn (September–November) is characterized by a pleasant drop in temperature, from a warm 22–23°C in September to a crisp 11°C in November.

As for precipitation, it is distributed throughout the year; however, there is a notable increase in the amount of rainfall and the number of rainy days during the summer and early autumn months. The highest precipitation and most rainy days occur between June and October, with July and August peaking in terms of wet days. Conversely, the winter months are drier with less precipitation.

The climate in Tachikawa is characterized by noticeable seasonal temperature fluctuations. The annual temperature range is quite wide: from cool and sometimes frosty winters to hot and humid summers. The coldest month is usually January, when the average temperature stays at 3.5°C, while nighttime minimums can drop to -0.8°C and daytime maximums barely reach 7.9°C. Conversely, August is the hottest month with an average temperature of 26.4°C, daytime peaks up to 29.5°C, and nighttime temperatures around 23.3°C.

Summer months in Tachikawa, especially July and August, bring consistently hot weather. Average daytime temperatures stay firmly above 28°C, while nights remain very warm, rarely dropping below 22–23°C. The high number of days with precipitation during this period (21–22 days in July–August) suggests that summer heat is often accompanied by high humidity, creating rather sweltering and muggy conditions. June is slightly milder, with average temperatures around 20.9°C, but already signals the approaching summer heat.

Winter in Tachikawa is cool. From December to February, average temperatures range from 3.5°C to 5.8°C. Daytime highs in January and February rarely exceed 8–9°C, and nights can be cold, with temperatures dropping to zero or even slightly below in January (averaging -0.8°C). The variations between daytime and nighttime temperatures during the winter and shoulder seasons (spring, autumn) are more pronounced than in summer, reaching 8–9°C. For example, in December, the difference between the average maximum (10.1°C) and minimum (1.4°C) temperature is nearly 9 degrees, indicating a significant cooling once darkness falls.

The city of Tachikawa experiences a well-defined seasonality in precipitation distribution throughout the year. The wettest period occurs during the summer months and early autumn, while winter is characterized by significantly lower rainfall and fewer rainy days.

The main season with the highest precipitation in Tachikawa lasts roughly from June to October. The highest rainfall figures are recorded in June, July, and October, when an average of 8 mm falls. July stands out as the month with the highest frequency of rain—precipitation is likely on about 22 days. June, August, and September also see a significant number of days with precipitation, ranging from 18 to 21 days. During this period, precipitation primarily falls as rain.

The driest months in Tachikawa are January and December. During this time, the average monthly precipitation is only 2 mm, and the number of days with precipitation drops to 8. February and November also feature relatively low rainfall (3 mm) and about 10 days with precipitation. Given that the average minimum temperature in January drops to -0.8°C, and stays near freezing in December and February, winter precipitation can occur as both rain and snow.

When planning a trip to Tachikawa, it is important to consider the weather variability throughout the year. Winter (December to February) is quite cool, with average temperatures ranging from 3.5°C to 5.8°C, and nighttime frosts are not uncommon. Therefore, you should definitely pack warm outerwear, sweaters, a hat, gloves, and a scarf. Although precipitation is low (2–3 mm), the number of rainy or snowy days can reach 8–10, so a waterproof jacket or a small umbrella will be useful.

In spring (March to May) and autumn (September to November), the weather in Tachikawa is milder but changeable. Temperatures gradually rise from 8.9°C to 17.5°C in spring and drop from 22.7°C to 11.4°C in autumn. Layering is particularly useful during these seasons: a light jacket, jumpers, and long-sleeved T-shirts will keep you comfortable as temperatures fluctuate. Rainfall in spring and early autumn (October) is moderate (5–8 mm), but the number of rainy days is significant—from 14 to 19—so an umbrella or raincoat will come in handy. Summer (June to August) in Tachikawa is warm and humid, with average temperatures reaching 20.9°C–26.4°C and maximums approaching 30°C. This is also the rainiest period, with 18–22 rainy days per month and rainfall of 6–8 mm. We recommend bringing light, breathable clothing made from natural fabrics, sunscreen, a hat, and, of course, a reliable umbrella or raincoat. Comfortable walking shoes are a must for any season, as you will likely want to explore the city on foot.