Yamanashi Prefecture Free Weather Report 2025

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🇯🇵 Yamanashi Prefecture Weather Report – Month-by-Month Overview

🌨️ January
Cold and snowy, especially near Mount Fuji and the Southern Alps. Kofu averages −2 to 6°C. Skies are often clear, but mornings are frosty. Snowfall is frequent in higher elevations, making it ideal for winter sports.

🌨️ February
Still wintry. Highs reach 5–9°C, with lows below freezing. Snow continues in mountain towns like Fujikawaguchiko. Sunshine increases slightly, but the air remains crisp and dry.

🌧️ March
Spring begins. Temperatures rise to 8–15°C. Snow melts in lower regions, replaced by rain. Plum blossoms bloom, and foggy mornings are common in valleys.

🌸 April
Mild and blooming. Highs reach 14–21°C. Cherry blossoms peak across the prefecture, especially around Lake Kawaguchi and Kofu Castle. Rain showers alternate with sunny spells.

🌼 May
Warm and pleasant. Temperatures climb to 18–25°C. Rainfall is light, and skies are mostly clear. Ideal for hiking in the Yatsugatake Mountains and exploring vineyards.

☀️ June
Start of the rainy season. Highs range from 22–28°C. Humidity rises, and afternoon showers are frequent. Rivers swell, and greenery flourishes across the region.

🔥 July
Hot and humid. Temperatures reach 26–33°C. Rainfall peaks early, then tapers off. Summer festivals begin, and mountain escapes offer cooler air.

🏖️ August
Still hot. Highs remain between 27–34°C. Rain is infrequent, and sunshine dominates. Popular time for climbing Mount Fuji and enjoying lakeside retreats.

🍂 September
Transition to autumn. Temperatures ease to 23–30°C. Rain returns gradually, and typhoon remnants may affect the region. Nights begin to cool, and foliage starts to shift.

🌦️ October
Cooler and clearer. Highs drop to 17–24°C. Rainfall decreases, and autumn colors peak in forests and mountain passes. Crisp air makes it ideal for travel.

🌫️ November
Chilly and dry. Highs hover around 11–18°C, with lows near 5°C. Rain is minimal, and foggy mornings are common. Early snow may appear in higher elevations.

🎄 December
Winter returns. Temperatures range from −1 to 8°C. Snowfall resumes in mountainous areas. Skies are often clear, and festive lights brighten towns and resorts.

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Weather in Yamanashi, Japan: A Month-by-Month AnalysisYamanashi Prefecture, located in central Japan, is a region known for its stunning natural landscapes, including Mount Fuji, the Fuji Five Lakes, and the Minami Alps National Park. Its climate, classified as Dfb (humid continental with warm summers and significant snowfall in winter) according to the Köppen-Geiger system, is shaped by its mountainous geography and proximity to Tokyo, approximately 70 miles away. This report provides a detailed month-by-month analysis of Yamanashi’s weather, including temperature ranges, precipitation, humidity, and sunshine hours, to assist in trip planning and understanding seasonal variations. Data is drawn from historical averages (1991–2021) and recent forecasts, with temperatures primarily reported in Celsius for consistency with local conventions.JanuaryJanuary is Yamanashi’s coldest month, with average daytime temperatures ranging from 3°C to 7°C in areas like Hokuto and Yamanakako, and nighttime lows dipping to -8.9°C to -5°C. The mean temperature hovers around -0.39°C. Precipitation is relatively low at 71 mm, with about 6 rainy or snowy days, and February is the snowiest month with approximately 20 cm of snow accumulation. Humidity averages 63%, the lowest of the year, and sunshine hours are around 7.1 daily. The frigid conditions make January ideal for winter sports enthusiasts visiting ski resorts in the Minami Alps, but heavy winter clothing is essential due to the cold and occasional snowfall.FebruaryFebruary remains cold, with average maximum temperatures between 4°C in Hokuto and 8°C in Yamanakako, and lows from -8.1°C to -5.37°C. The mean temperature is slightly higher at 0.96°C. Precipitation increases to 82 mm across 7 days, with snow still prevalent, especially in higher elevations. Humidity rises to 66%, and sunshine hours average 7.0 daily. February is also a winter month, suitable for snow-related activities, but the persistent cold requires layered clothing and precautions against icy conditions.MarchMarch marks the transition to spring, though temperatures remain cool, with highs ranging from 8°C to 11°C and lows from -4.4°C to -1.79°C. The mean temperature is about 4.97°C. Precipitation increases significantly to 130 mm over 10 days, reflecting the onset of Japan’s rainy season precursors. Humidity is around 66%, and sunshine hours increase to 7.5 daily. March is less ideal for outdoor activities due to chilly and wet conditions, but it’s a good time for early cherry blossom viewing in lower elevations, with lighter jackets recommended.AprilApril brings milder weather, with average highs of 14°C to 17°C and lows from 1.2°C to 3°C, yielding a mean temperature of 10.25°C. Precipitation is substantial at 134 mm across 11 days, indicating a wet spring. Humidity rises to 68%, and sunshine hours are around 7.6 daily. This month is considered unpleasant for extensive outdoor activities due to frequent rain, but it’s popular for cherry blossom viewing, especially around mid-April when blooms peak in Yamanashi. Visitors should carry umbrellas and waterproof clothing.MayMay is one of the best months to visit Yamanashi, with pleasant weather featuring average highs of 20°C to 21°C in Fujikawaguchiko and lows around 6.8°C to 10°C. The mean temperature is 16.23°C. Precipitation is 154 mm over 12 days, but the weather is generally more stable than in April. Humidity averages 71%, and sunshine hours peak at 8.3 daily. May’s mild temperatures and moderate rainfall make it ideal for hiking, sightseeing at Mount Fuji, and enjoying outdoor festivals, with light clothing and a raincoat sufficient.JuneJune ushers in the rainy season (baiu), with warm temperatures averaging 22°C to 23°C during the day and 11.4°C to 15°C at night, with a mean of 19.21°C. Precipitation spikes to 209 mm across 15 days, making it one of the wettest months. Humidity climbs to 81%, and sunshine hours drop to 7.0 daily due to overcast skies. The weather ranges from unpleasant in Fujikawaguchiko to tolerable in Hokuto. Visitors should expect frequent showers and pack waterproof gear, though indoor activities like visiting wineries in Koshu City are recommended.JulyJuly is a summer month with warm temperatures, averaging 26°C to 27°C during the day and 15.7°C to 19°C at night, with a mean of 23.16°C. Precipitation is high at 226 mm over 16 days, and humidity peaks at 83%, the highest of the year. Sunshine hours are 7.4 daily. The hot and humid conditions, combined with frequent rain, make outdoor activities challenging, but summer festivals and fireworks displays are abundant. Lightweight, breathable clothing and rain protection are necessary.AugustAugust is Yamanashi’s warmest month, with highs of 27°C to 28°C in Fujikawaguchiko and lows around 16.3°C to 20°C, with a mean of 24.03°C. Precipitation is slightly lower at 201 mm across 16 days, but humidity remains high at 83%. Sunshine hours are 7.0 daily, offering ample daylight for outdoor pursuits. The heat and humidity can be intense, with recent reports noting temperatures reaching 34°C to 35°C in 2025, making hydration critical. August is ideal for festivals and lake activities, but visitors should dress lightly and carry sun protection.SeptemberSeptember sees a gradual cooling, with highs of 23°C to 25°C and lows from 13°C to 16°C, with a mean of 19.67°C. It is the wettest month, with 236 mm of precipitation over 14 days, driven by late summer rains and occasional typhoons. Humidity is high at 84%, and sunshine hours drop to 5.9 daily. The weather is poor in Yamanakako but tolerable in Hokuto. Autumn foliage begins to appear, making it a scenic time for visits, though rain gear is essential due to heavy rainfall.OctoberOctober brings cooler, more comfortable weather, with highs of 18°C to 20°C and lows from 7.2°C to 13.59°C, with a mean of 13.89°C. Precipitation remains high at 209 mm over 11 days, but humidity drops to 80%. Sunshine hours are 5.6 daily. The weather is tolerable in Hokuto but less so in Fujikawaguchiko due to rain. October is excellent for viewing vibrant autumn foliage, especially around the Fuji Five Lakes, with light jackets and waterproof clothing recommended.NovemberNovember is cooler, with highs of 12°C to 15°C and lows from 0.8°C to 2.52°C, with a mean of 8.54°C. Precipitation decreases to 98 mm over 8 days, and humidity is 74%. Sunshine hours are 6.2 daily. The crisp weather and stunning fall colors make November ideal for hiking and sightseeing, though a warm jacket is needed, especially in the evenings.DecemberDecember returns to winter conditions, with highs of 6°C to 10°C and lows from -4.9°C to -2.83°C, with a mean of 2.7°C. Precipitation is lowest at 63 mm over 6 days, often as snow in higher areas. Humidity is 68%, and sunshine hours are 6.5 daily. December is great for winter activities and early holiday events, requiring heavy winter clothing.ConclusionYamanashi’s climate offers diverse experiences, from snowy winters to warm, wet summers. May and late April are ideal for pleasant weather and cherry blossoms, while August is best for summer festivals despite the heat. September and October are perfect for autumn foliage, though rain is frequent. Winter months like January and February cater to snow enthusiasts. Visitors should prepare for high humidity and precipitation, especially from June to October, and pack accordingly for seasonal temperature swings. For precise planning, check local forecasts closer to your travel date, as Yamanashi’s mountainous terrain can cause microclimate variations.

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