Yokohama has a humid subtropical climate (Köppen Cfa) with four distinct seasons. Located on the western shore of Tokyo Bay at 35°N latitude, the city experiences hot, humid summers and mild winters. Annual rainfall totals approximately 1,630mm (64 inches), with the wettest months from June through October. The city’s coastal position moderates temperature extremes compared to inland Japanese cities at the same latitude.
Yokohama Weather by Month: Monthly Breakdown
January
Average high 10°C (50°F), average low 2°C (36°F). January is Yokohama’s coldest month but rarely dips below freezing. Rainfall averages 55mm over 5 rainy days. Clear skies are common , sunshine averages 6 hours per day. Snow is extremely rare; the city might see a light dusting once every 3-4 years. Sea temperature drops to 16°C (61°F). Pack a warm coat, scarf, and gloves for evening walks along the waterfront.
February
Average high 10°C (50°F), average low 3°C (37°F). Similar to January but with slightly less rain , about 63mm over 6 days. Late February sees the first plum blossoms (ume) at Sankeien Garden. Sunshine increases to 6.5 hours daily. Sea temperature holds at 16°C (61°F). The Yokohama Strawberry Festival runs through February at various locations around the city.
March
Average high 13°C (55°F), average low 6°C (43°F). A transitional month with warming temperatures and 115mm of rain over 10 days. Cherry blossoms (sakura) typically begin blooming in the last week of March, with peak bloom around March 28 to April 3. Sankei-en Garden and the Yamashita Park waterfront are prime viewing spots. Sunshine reaches 6 hours daily. Sea temperature warms to 17°C (63°F). Layers are essential , mornings can be chilly while afternoons feel spring-like.
April
Average high 18°C (64°F), average low 11°C (52°F). Arguably Yokohama’s most pleasant month. Cherry blossoms are in full bloom during the first week. Rainfall increases to 130mm over 10 days but comes in short showers rather than all-day rain. Sunshine averages 6 hours daily. Sea temperature reaches 18°C (64°F). Humidity is low, making it comfortable for exploring Minato Mirai on foot. A light jacket suffices for most days.
May
Average high 22°C (72°F), average low 16°C (61°F). Warm, sunny, and dry before the rainy season arrives. Rainfall is moderate at 140mm over 10 days. Sunshine peaks at 7 hours daily , the sunniest month of the year alongside August. Sea temperature warms to 20°C (68°F). This is one of the best months for outdoor activities like the Yokohama Port Opening Festival and strolling through Yamashita Park. Short sleeves are fine during the day with a light layer for evenings.
June
Average high 25°C (77°F), average low 19°C (66°F). The tsuyu (rainy season) typically runs from early June to mid-July. Rainfall jumps to 190mm over 13 rainy days , the second-wettest month. Humidity climbs to 78%, making 25°C feel considerably warmer. Sunshine drops to 5 hours daily. Sea temperature reaches 22°C (72°F). Pack a compact umbrella and waterproof shoes. Indoor attractions like the Cup Noodles Museum and Ramen Museum are good rainy-day options.
July
Average high 29°C (84°F), average low 23°C (73°F). Hot and humid as the rainy season tapers off by mid-month. Rainfall remains high at 165mm over 12 days. Humidity averages 80%. Sea temperature climbs to 25°C (77°F). Sunshine recovers to 6 hours daily. The Yokohama Summer Festival and fireworks displays happen in July. Light, breathable clothing is essential. Air conditioning provides relief in malls like Landmark Plaza and Queen’s Square.
August
Average high 31°C (88°F), average low 25°C (77°F) , the hottest month. Heat indices can reach 38°C (100°F) with humidity at 80%. Rainfall is 155mm over 11 days, often from afternoon thunderstorms. Sea temperature peaks at 27°C (81°F). Sunshine averages 7 hours daily. The Yokohama Sparkling Twilight fireworks display draws crowds to Yamashita Park. Stay hydrated, wear a hat, and take breaks in air-conditioned spaces. Early mornings and evenings are best for outdoor exploration.
September
Average high 27°C (81°F), average low 21°C (70°F). Typhoon season peaks in September, bringing the highest monthly rainfall at 230mm over 13 rainy days. Humidity remains high at 78%. Sea temperature holds at 26°C (79°F). Sunshine averages 5 hours daily. Typhoons typically bring 1-2 days of heavy rain and wind before clearing , check Japan Meteorological Agency (JMA) forecasts. The Yokohama Oktoberfest at the Red Brick Warehouse usually runs from late September into October.
October
Average high 22°C (72°F), average low 16°C (61°F). A marked improvement from September , humidity drops significantly and rainfall decreases to 165mm over 11 days. Sunshine averages 5 hours daily. Sea temperature cools to 23°C (73°F). This is one of the best months for visiting, with comfortable temperatures, autumn foliage beginning in parks, and the Yokohama Oktoberfest continuing. A light jacket or sweater is enough for most days.
November
Average high 17°C (63°F), average low 10°C (50°F). Autumn foliage peaks in mid-to-late November. Sankeien Garden and Mitsuike Park display brilliant red and gold maple leaves. Rainfall drops sharply to 92mm over 7 days , the start of the dry season. Sunshine averages 5.5 hours daily. Sea temperature falls to 21°C (70°F). A medium-weight jacket is appropriate. This is one of the most photogenic months for visiting Yokohama.
December
Average high 13°C (55°F), average low 5°C (41°F). Crisp, clear days with low humidity. Rainfall is minimal at 45mm over 5 days , the driest month. Sunshine averages 6 hours daily. Sea temperature drops to 18°C (64°F). Yokohama’s holiday illuminations transform Minato Mirai, with the annual “Yokohama Mirai Light” display running from late November through December. A warm coat and gloves are sufficient , snow is virtually unheard of in December.
Yokohama Weather by Month: Quick Reference Table
| Month | Avg High | Avg Low | Rain (mm) | Rain Days | Sun (hrs) | Sea Temp |
|---|---|---|---|---|---|---|
| Jan | 10°C / 50°F | 2°C / 36°F | 55 | 5 | 6.0 | 16°C / 61°F |
| Feb | 10°C / 50°F | 3°C / 37°F | 63 | 6 | 6.5 | 16°C / 61°F |
| Mar | 13°C / 55°F | 6°C / 43°F | 115 | 10 | 6.0 | 17°C / 63°F |
| Apr | 18°C / 64°F | 11°C / 52°F | 130 | 10 | 6.0 | 18°C / 64°F |
| May | 22°C / 72°F | 16°C / 61°F | 140 | 10 | 7.0 | 20°C / 68°F |
| Jun | 25°C / 77°F | 19°C / 66°F | 190 | 13 | 5.0 | 22°C / 72°F |
| Jul | 29°C / 84°F | 23°C / 73°F | 165 | 12 | 6.0 | 25°C / 77°F |
| Aug | 31°C / 88°F | 25°C / 77°F | 155 | 11 | 7.0 | 27°C / 81°F |
| Sep | 27°C / 81°F | 21°C / 70°F | 230 | 13 | 5.0 | 26°C / 79°F |
| Oct | 22°C / 72°F | 16°C / 61°F | 165 | 11 | 5.0 | 23°C / 73°F |
| Nov | 17°C / 63°F | 10°C / 50°F | 92 | 7 | 5.5 | 21°C / 70°F |
| Dec | 13°C / 55°F | 5°C / 41°F | 45 | 5 | 6.0 | 18°C / 64°F |
Yokohama Weather by Month: Extremes and Records
The highest temperature ever recorded in Yokohama is 37.4°C (99.3°F) on August 11, 2013. The lowest is -8.2°C (17.2°F) on January 24, 1954. Typhoon season (August through October) can bring winds exceeding 120 km/h (75 mph), though Yokohama’s position inside Tokyo Bay provides more protection than exposed Pacific coastal cities. The 2019 Typhoon Hagibis caused localized flooding in low-lying areas near the port.
