Chiba Prefecture Free Weather Report 2025

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世界逆転宣言！【セカセン！】@sekai_gyakuten

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

❄️ January
Cool and dry. Chiba City averages 3–10°C. Snow is rare but possible inland. Skies are mostly clear, with crisp air and low humidity. Coastal areas feel breezy.

🌨️ February
Still mild. Highs reach 10–13°C, with lows around 4°C. Occasional frost in rural areas. Rainfall remains low, and sunshine hours increase slightly.

🌱 March
Spring begins. Temperatures rise to 12–17°C. Plum blossoms bloom, and rainfall increases. Coastal zones warm faster, while inland areas stay crisp.

🌸 April
Mild and blooming. Highs reach 17–22°C. Cherry blossoms peak across the prefecture, especially in Narita and Chiba Park. Rain showers alternate with sunny spells.

🌼 May
Warm and pleasant. Temperatures climb to 21–26°C. Rainfall is light, and skies are mostly clear. Ideal for seaside visits and countryside travel.

☀️ June
Start of the rainy season. Highs range from 24–29°C. Humidity rises, and afternoon showers are frequent. Rivers swell, and vegetation flourishes.

🔥 July
Hot and humid. Temperatures reach 28–34°C. Rainfall peaks early, then tapers off. Summer festivals begin, and evenings stay warm and muggy.

🏖️ August
Still hot. Highs remain between 29–35°C. Rain is infrequent, and sunshine dominates. Beaches like Kujūkuri and Onjuku are popular for swimming and fireworks.

🍂 September
Transition to autumn. Temperatures ease to 25–31°C. Rain returns gradually, and typhoon activity may affect coastal areas. Nights begin to cool.

🌦️ October
Cooler and clearer. Highs drop to 19–26°C. Rainfall decreases, and autumn foliage begins in parks and temple grounds. Ideal for travel and photography.

🌫️ November
Chilly and dry. Highs hover around 14–21°C, with lows near 9°C. Rain is minimal, and foggy mornings are common. Fall colors peak inland.

🎄 December
Winter returns. Temperatures range from 6–13°C. Snow is rare, but mountain areas may see frost. Skies are mostly clear, and festive lights brighten city streets.

Chiba, Japan: Monthly Weather ReportChiba, Japan, located in the Chubu region, experiences a humid subtropical climate (Cfa under the Köppen classification), characterized by distinct seasonal variations, significant rainfall throughout the year, and moderate temperatures. This report provides a detailed analysis of Chiba’s weather patterns by month, covering temperature, precipitation, humidity, sunshine hours, and sea temperatures, based on historical averages and recent data. The information draws from reputable sources such as Weather Atlas, Climate-Data.org, and The Weather Network, offering a comprehensive guide for residents, travelers, and weather enthusiasts.

JanuaryJanuary is Chiba’s coldest month, with average high temperatures around 9.3°C (48.7°F) and lows dipping to 3.8°C (38.8°F). It is also the driest month, with approximately 41mm (1.61 inches) of precipitation over 7.2 rainy days, making it one of the least rainy periods. Relative humidity averages 62%, the lowest of the year, contributing to a crisp atmosphere. Snowfall is minimal, with only 2mm (0.08 inches) possible, and sunshine hours average 6.7 hours per day. Sea temperatures are chilly, averaging 13.7°C (56.7°F), unsuitable for swimming. January’s low UV index (3) and clear skies make it ideal for outdoor activities like sightseeing, though bundling up is necessary.

FebruaryFebruary sees a slight warming, with highs reaching 9.8°C (49.6°F) and lows around 4.4°C (39.9°F). Precipitation increases to 49.5mm (1.95 inches) over 7.3 rainy days, and snowfall peaks at 26mm (1.02 inches), the most for the year, though still rare. Humidity rises to 65%, and sunshine hours drop to 5.3, the lowest annually, due to occasional cloud cover. Sea temperatures hit their yearly low at 12.9°C (55.2°F). February retains a wintry feel, with occasional snow dusting the landscape, but it’s still a good time for indoor cultural activities in Chiba.

MarchMarch marks the transition to spring, with highs climbing to 12.9°C (55.2°F) and lows at 7.1°C (44.8°F). Rainfall intensifies to 74mm (2.91 inches) across 9.1 days, reflecting the shift to wetter conditions. Humidity averages 67%, and sunshine hours increase to 7.3, offering more daylight for exploration. Sea temperatures remain cool at 13.2°C (55.8°F). March’s mild weather and budding cherry blossoms make it a popular time for visitors, though rain gear is advisable. The UV index remains low at 3, posing minimal risk.

AprilApril brings full spring conditions, with highs of 17.2°C (63°F) and lows of 11.3°C (52.3°F). Precipitation peaks at 77mm (3.03 inches) over 14.3 days, but snowfall ceases. Humidity rises to 69%, and sunshine hours reach 8.2, providing pleasant conditions for outdoor activities. Sea temperatures warm to 14.7°C (58.5°F), still too cold for swimming. April’s comfortable temperatures and vibrant spring scenery, including cherry blossoms, make it an excellent time to visit Chiba, though expect occasional showers.

MayMay sees significant warming, with highs of 21.8°C (71.2°F) and lows at 16.3°C (61.3°F). Rainfall remains high at 73mm (2.87 inches) over 12.7 days, and humidity climbs to 74%. Sunshine hours peak at 9.0, offering long, bright days. Sea temperatures rise to 17.9°C (64.2°F), suitable for some water activities. May’s warm, pleasant weather and moderate rainfall make it one of the best months to visit Chiba, ideal for exploring parks and coastal areas.

JuneJune ushers in summer, with highs reaching 24°C (75.2°F) and lows at 19.4°C (66.9°F). Rainfall spikes to 103mm (4.06 inches) over 17.8 days, marking the onset of the rainy season. Humidity soars to 82%, and sunshine hours drop to 8.5 due to cloud cover. Sea temperatures reach 20.9°C (69.6°F), inviting beachgoers. June’s warm, wet conditions are less ideal for outdoor plans, but indoor attractions like museums thrive.

JulyJuly is the height of summer, with highs of 28°C (82.4°F) and lows at 23.1°C (73.6°F). Precipitation is substantial at 125.1mm (4.93 inches) over 14 days, and humidity peaks at 82%, creating muggy conditions. Sunshine hours average 9.1, and sea temperatures hit 23.9°C (75°F), perfect for swimming. July’s heat and humidity make it ideal for beach activities, but rain can disrupt plans, so flexibility is key.

AugustAugust is Chiba’s warmest month, with highs of 29.8°C (85.6°F) and lows at 24.8°C (76.6°F). Rainfall decreases slightly to 57.7mm (2.27 inches) over 10.2 days, but humidity remains high at 79%. Sunshine hours are at their peak, averaging 10.2 hours, and sea temperatures reach 26.1°C (79°F), the warmest of the year. August is prime for beach vacations and water sports, though recent reports note extreme heat, with temperatures in nearby areas reaching 41.8°C (107.2°F) in 2025.

SeptemberSeptember sees a cooling trend, with highs dropping to 26.4°C (79.5°F) and lows at 21.8°C (71.2°F). Rainfall surges to 117mm (4.61 inches) over 16.3 days, one of the wettest months. Humidity stays high at 81%, and sunshine hours decrease to 7.6. Sea temperatures remain warm at 24.9°C (76.8°F). September’s heavy rain and typhoon risk make it less ideal for travel, though indoor activities remain viable.

OctoberOctober is the wettest month, with 124mm (4.88 inches) of precipitation over 15.9 days and highs of 21.5°C (70.7°F) and lows of 16.9°C (62.4°F). Humidity averages 78%, and sunshine hours drop to 6.5. Sea temperatures cool to 21.6°C (70.9°F). October’s heavy rainfall and reduced daylight make it the least favorable month for outdoor activities, though cooler temperatures offer some relief.

NovemberNovember brings cooler weather, with highs of 16.7°C (62.1°F) and lows at 11.9°C (53.4°F). Rainfall decreases to 67mm (2.64 inches) over 12.5 days, and humidity drops to 71%. Sunshine hours average 6.1, and sea temperatures fall to 18.8°C (65.8°F). November’s crisp, mild weather is excellent for sightseeing and outdoor adventures, with fewer crowds.

DecemberDecember is winter’s onset, with highs of 11.7°C (53.1°F) and lows at 6.6°C (43.9°F). Precipitation is minimal at 43mm (1.69 inches) over 9.4 days, and humidity averages 63%. Sunshine hours are 6.3, and sea temperatures drop to 15.8°C (60.4°F). December’s cool, dry conditions and occasional festive events make it a pleasant time for cultural exploration.

Best and Worst Times to VisitThe best time to visit Chiba is late spring to early summer (May to July), with comfortable temperatures (21.8°C–28°C), longer daylight (14–14.5 hours), and warm sea temperatures (18.4°C–23.8°C). These months balance warmth and moderate rainfall, ideal for outdoor and coastal activities. The worst time is September to October, due to heavy rainfall (117mm–124mm) and typhoon risks, which can disrupt plans.

ConclusionChiba’s weather varies significantly by month, with mild winters, wet summers, and transitional spring and autumn seasons. Visitors should plan around May–July for optimal conditions, avoiding the rainy September–October period. Always check short-term forecasts, as recent extreme heat events indicate potential variability. This report equips travelers and residents with the data needed to navigate Chiba’s dynamic climate effectively.

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