Yokosuka
Decide whether to visit or live in Yokosuka, then explore current conditions, local people, the map, and concise sourced context.
Check visit & living safetyUpdated Friday, October 9, 2026 · sourced live layer and versioned editorial content
AI-assisted, evidence-constrained research · how this page is made
Would you visit or live in Yokosuka?
Choose your plan and circumstances. The result changes immediately using today's advisory, weather, air-quality, and sourced local signals.
Generally suitable with routine precautions
British travel advice for Japan includes information regarding flooding and heavy rain.
high source confidence · current planning signal, not a personal-safety guaranteeSee the evidence and calculation
- No high-severity wording detected in the supplied advisory
- Latest air-quality reading is not elevated
- Flooding and heavy rain advisories
The score combines dated official-advisory wording, weather, air quality, sourced local context, and your selections. It does not predict crime or individual outcomes. Check local authorities and professional advice before a safety-critical decision.
Climate normals · 2016–2025
When to go: Yokosuka month by month
Judged purely on 2016–2025 weather records, the friendliest months in Yokosuka are typically May, June and August, with average daytime highs around 21–29°C. August is usually the warmest month (average high 29°C), January the coldest (average low 5°C), and June the wettest (about 219 mm). These are long-run averages, not a forecast.
| Month | Avg high (°C) | Avg low (°C) | Rain (mm) | Sunshine (h/day) |
|---|---|---|---|---|
| January | 10.0 | 4.6 | 66 | 7.8 |
| February | 10.6 | 4.9 | 73 | 7.9 |
| March | 13.7 | 8.0 | 165 | 8.2 |
| April | 17.3 | 12.4 | 141 | 8.8 |
| May | 20.8 | 16.6 | 165 | 8.9 |
| June | 23.8 | 20.1 | 219 | 8.7 |
| July | 27.3 | 24.0 | 190 | 9.8 |
| August | 28.9 | 25.4 | 134 | 10.7 |
| September | 26.5 | 22.7 | 216 | 8.4 |
| October | 21.2 | 17.0 | 217 | 6.9 |
| November | 17.0 | 12.1 | 105 | 7.5 |
| December | 12.5 | 7.1 | 61 | 7.4 |
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People and places shaping Yokosuka
AI-assisted local research, regenerated with the dated live layer. Every requested module remains visible; facts appear only after a source check, and unavailable categories explain what is still being researched.
Research updated Thursday, October 1, 2026Past and future events in Yokosuka
Upcoming
No future event in Yokosuka currently has a sufficiently reliable date and source. This is checked again on every refresh.
Previously
- Doolittle Raid
Yokosuka was bombed on April 18, 1942, by American B-25 Mitchell bombers with little damage as retaliation for the attack on Pearl Harbor.
- Great Kantō earthquake of 1923
Caused severe damage to Yokosuka, including the naval base which lost two years' operations of oil supplies.
Sources checked (2)
Interactive geography
See Yokosuka in context
Keep the deeper context
Stable history, culture, districts, and practical reference remain in the main reading flow while the live layers above continue changing.
01 · QuestionsQuestions about Yokosuka
Yokosuka is a city located in Kanagawa Prefecture, Japan, occupying most of the Miura Peninsula and bordering Tokyo Bay to the east and Sagami Bay to the west. It functions as a prominent industrial and military center within the Kantō region and the Greater Tokyo Area.
Questions on Yokosuka's Present-Day Economy
What drives the industrial sector in Yokosuka? Aside from the economic impact of various military installations like United States Fleet Activities Yokosuka, the local economy relies heavily on manufacturing. Nissan Motors and its affiliated subsidiaries operate factories that employ thousands of local residents. The 520,000-square-metre Oppama plant in Yokosuka assembles vehicle models including the Nissan Leaf, Nissan Cube, and Nissan Juke. This facility began operations in 1961, initially building the Nissan Bluebird, and remains adjacent to Nissan's Research and Development Center, the Oppama Proving Ground, and the Oppama Wharf used for domestic and overseas shipments.
What role does technology play in the local economy? Established in 1997, the Yokosuka Research Park serves as a major center for the Japanese telecommunications industry. Numerous wireless and mobile communications companies maintain research and development centers as well as joint testing facilities at this park.
02 · OverviewYokosuka, in brief
What defines Yokosuka as a city in Kanagawa Prefecture, Japan?
Yokosuka is a municipality situated in Kanagawa Prefecture, Japan, occupying the majority of the Miura Peninsula. The city is bordered by the mouth of Tokyo Bay to the east and Sagami Bay on the Pacific Ocean to the west, covering a total area of 100.7 square kilometers.
What are the population details and regional rankings of the city?
As of February 2024, Yokosuka has a population of 373,797 residents, alongside a population density of 3,708 inhabitants per square kilometre. Within the wider regional context, the municipality stands as the 11th-most populous city in the Greater Tokyo Area and ranks as the 12th-most populous city in the Kantō region. Demographic tracking based on Japanese census data indicates that the population peaked around 1990 and has subsequently declined. Foreign citizens residing within the municipal boundaries primarily comprise individuals from the Philippines, Korea, China, and the United States.
How does Yokosuka function within its present-day economy and strategic setting?
Geographically positioned at a strategic location at the entrance to Tokyo Bay, Yokosuka is home to United States Fleet Activities Yokosuka. The area maintains deep historical ties to maritime defense and shipbuilding infrastructure, originating from the 19th century when the Shogunate selected the site for a modern naval base and established the Yokosuka Iron Foundry under the direction of French engineer Léonce Verny. Following the Meiji Restoration, this facility transitioned into the Yokosuka Naval Arsenal under the Imperial Japanese Navy, shaping the industrial foundation of the region.
Frequently Asked Questions about Yokosuka
Essential geographic, demographic, currency, and travel context verified from primary records.
01 · Q&AWhere is Yokosuka located and what are its coordinates?
Yokosuka is situated in Japan at geographic coordinates 35.2836, 139.6672, with an elevation monitored in regional geographic surveys.
02 · Q&AWhat is the population and time zone of Yokosuka?
Yokosuka has a recorded population of approximately 409,478 and observes the Asia/Tokyo time zone.
03 · Q&AWhat languages and currency are used in Yokosuka?
Official and commonly spoken languages in Yokosuka include Japanese, with JPY used for local transactions.
04 · Q&AHow can I check live conditions and daily updates for Yokosuka?
Today's Atlas provides continuous tracking for Yokosuka, featuring real-time weather conditions, daylight cycles, local geographic signals, and verified daily briefs.