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Sagami Bay

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Sagami Bay Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Sagami Bay year round climate

  • Spring (March–May): Average 9.5–17.5°C, mild climate but relatively high rainfall, especially in April and May. Common activities: Coastal walks, flower viewing (e.g., cherry blossoms, depending on blooming conditions). Recommended clothing: Light jacket, long-sleeved shirts and pants, rain gear.
  • Summer (June–August): Average 21.5–27.4°C, hot and humid, with higher rainfall in June and September. Common activities: Swimming, surfing, water sports. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 12.8–24.9°C, pleasant and comfortable climate, with higher rainfall in September. Common activities: Hiking, sightseeing, enjoying autumn scenery. Recommended clothing: Comfortable jacket, long-sleeved shirts and pants.
  • Winter (December–February): Average 4.1–7.6°C, cold and dry, with low rainfall. Common activities: Hot spring bathing, enjoying winter seascapes. Recommended clothing: Warm jacket, sweater, scarf and gloves.

Sagami Bay climatological average

Annual average temperature: approx. 15.7°C / Annual rainfall: approx. 1908 mm / Summer humidity: 70%–80% / Rainiest month: June

Sagami Bay monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
4.1°C
37.8
February
5.1°C
83.7
March
9.5°C
180.8
April
14.5°C
203.2
May
17.5°C
205.5
June
21.5°C
302.3
July
26.5°C
156.8
August
27.4°C
151.7
September
24.9°C
300.8
October
17.6°C
140
November
12.8°C
107.2
December
7.6°C
38.2

Sagami Bay weather for the next seven days

4/21
Tuesday
Patchy rain nearby
21°C/15.6°C
4/22
Wednesday
Partly Cloudy
19.3°C/15.1°C
4/23
Thursday
Moderate rain
18.7°C/12.9°C
4/24
Friday
Heavy rain
13.4°C/12.5°C
4/25
Saturday
Patchy rain nearby
18.3°C/11.9°C
4/26
Sunday
Patchy rain nearby
16.3°C/13.1°C
4/27
Monday
Patchy rain nearby
16.7°C/13.7°C

Sagami Bay Frequently Asked Questions and Useful Information for Travel

What is Sagami Bay known for?

Sagami Bay, located in Japan, is renowned as the 'Treasure House of Nudibranchs.' It's an excellent spot for macro diving, offering a remarkable abundance of nudibranchs, as well as other marine life like lumpfish, blennies, and frogfish.

Can you swim in Sagami Bay?

Yes, you can swim in Sagami Bay. Many beaches facing Sagami Bay, particularly near Kamakura, are popular summer destinations. These beaches often feature expansive, shallow shoals that are ideal for swimming and attract many visitors during the warmer months.

How deep is Sagami Bay?

Sagami Bay has a maximum depth of approximately 1500 meters. The bay's depth and the influence of currents like the Oyashio Current contribute to its very high biodiversity, supporting a wide array of marine organisms.

Are there any islands in Sagami Bay?

Yes, Hatsushima is an island located within Sagami Bay. Administratively part of Atami city in Shizuoka Prefecture, Hatsushima can be reached by ferry from Atami and is a notable feature of the bay.

What kind of marine life can be found in Sagami Bay?

Sagami Bay is exceptionally rich in marine life. It is particularly famous for its diverse population of nudibranchs, earning it the nickname 'Treasure House of Nudibranchs.' Divers also frequently encounter lumpfish, blennies, and frogfish, showcasing the bay's vibrant underwater ecosystem.