Numazu

Planning your day in Numazu? Here you will find the most up-to-date weather information, including detailed forecasts and visual charts, to ensure your stay is as comfortable as possible.

The city of Numazu in Japan enjoys a temperate climate with four distinct seasons. Travelers can expect significant weather changes throughout the year, making each season attractive in its own way by offering a variety of temperature conditions and precipitation levels.

Winter (December–February) in Numazu is quite cool, with average temperatures ranging from 4.7°C in January to 6.9°C in December; it is the driest period of the year with minimal rainfall (2–4 mm). Spring (March–May) brings a gradual and pleasant warming: the average air temperature rises from 9.0°C in March to 16.8°C in May, while precipitation increases slightly. Summer (June–August) is the warmest time of year, when average temperatures reach 20.2°C–25.6°C. This season is also characterized as the most humid: June sees the highest volume of rainfall (11 mm), and August has the highest number of rainy days (averaging 21 days). Autumn (September–November) begins with comfortably warm days (average September temperature of 22.5°C), gradually transitioning to cooler weather by November (12.2°C); precipitation remains moderate during this period, especially at the start of the season, before declining.

The climate in Numazu is characterized by noticeable seasonal temperature changes throughout the year. The hottest month is typically August, when the average air temperature is 25.6°C and daytime highs can reach 28.3°C. In contrast, the coldest month is January, with an average temperature of about 4.7°C and nighttime lows dropping to 1.5°C. Thus, the annual temperature range in Numazu is quite broad, encompassing both cool winter days and hot summer periods.

Summer months in Numazu, especially July and August, feature warm and sometimes hot weather. Average temperatures during this period range from 24.3°C to 25.6°C. Daytime highs often rise above 27–28°C, while nights remain warm with temperatures around 21–23°C. Given the significant number of rainy days in summer (19–21 days), high humidity can be expected, which makes the heat feel more intense. Spring (April–May) and autumn (September–October) months offer more moderate and comfortable temperatures, averaging from 12.7°C to 22.5°C.

Winter in Numazu, from December to February, is characterized as cool but not freezing. Average monthly temperatures during this period range from 4.7°C in January to 6.9°C in December. At night, air temperatures can drop to 1.5–3.6°C, though severe frosts are atypical. During the day, the thermometer usually shows between 7.9°C and 10.2°C. The difference between day and night temperatures throughout the year averages about 5–7°C, indicating moderate daily fluctuations without sharp extremes.

The city of Numazu experiences pronounced seasonality in its precipitation distribution. The wettest month by volume of rainfall is June, with an average of 11 mm recorded. It is followed by July with 10 mm. In terms of frequency, August leads with 21 rainy days, although the total precipitation that month is 8 mm. The driest months, both in terms of rainfall volume (only 2 mm) and the number of rainy days (10–11 days), are December and January.

The nature of precipitation in Numazu changes depending on the time of year. In winter, especially in January and February, when minimum temperatures drop to 1.5–2.0°C, snowfall is possible alongside rain, though the total volume of precipitation in these months is low, suggesting light snow or drizzle. Rain predominates in spring and autumn. Summer months like June and July are characterized by the highest volume of precipitation, indicating periods of more intense rain. In August, despite a slightly lower volume, rain occurs most frequently.

Overall, a distinct wet season can be identified in Numazu, lasting from late spring to early autumn, roughly from May to October. During this period, precipitation ranges from 8 mm to 11 mm per month, and the number of rainy days varies from 15 to 21. Conversely, the winter months (December, January, February) and November can be considered a drier period, when precipitation is significantly lower and there are fewer rainy days, particularly in December and January.

When planning a trip to Numazu, it is important to consider seasonal weather changes to ensure your luggage is packed correctly. Winter (December–February) is quite cool here, with average temperatures around 4–7°C, sometimes dropping to 1–2°C. Although total precipitation is low, there can be 10–13 rainy days per month. Therefore, be sure to bring warm clothing: sweaters, fleeces, an insulated jacket, a hat, gloves, and a scarf. Layering will help you adapt to temperature differences between the outdoors and heated interiors.

Spring (March–May) and autumn (September–November) in Numazu are characterized by milder weather. In spring, temperatures gradually rise from 9°C to 17°C, while in autumn, they drop from a pleasant 22–25°C in September to 12°C in November. During these periods, the number of rainy days increases, especially in March–May and September–October (15–20 days per month). Layering is the ideal choice: T-shirts, shirts, a light sweater or cardigan, and a windbreaker or light waterproof jacket. Don’t forget comfortable walking shoes, as you will surely want to explore the city on foot.

Summer (June–August) in Numazu is warm and humid, with average temperatures of 20–26°C, sometimes reaching 28°C. This is also the rainiest season, with 19–21 rainy days per month and the highest volume of precipitation. Your summer wardrobe should include light, breathable clothing made from natural fabrics, shorts, T-shirts, and sandals. Be sure to pack a hat, sunscreen, and sunglasses. Given the high probability of rain, a compact umbrella or light raincoat will be indispensable almost any time of year, but especially in summer and during the shoulder seasons.