Koshigaya
Decide whether to visit or live in Koshigaya, then explore current conditions, local people, the map, and concise sourced context.
Check visit & living safetyUpdated Thursday, October 15, 2026 · sourced live layer and versioned editorial content
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Would you visit or live in Koshigaya?
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Generally suitable with routine precautions
Addition of information about flooding and heavy rain ('Safety and security' page).
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- No high-severity wording detected in the supplied advisory
- Latest air-quality reading is not elevated
- flooding
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Climate normals · 2016–2025
When to go: Koshigaya month by month
Judged purely on 2016–2025 weather records, the friendliest months in Koshigaya are typically April, May and October, with average daytime highs around 19–24°C. August is usually the warmest month (average high 32°C), January the coldest (average low 0°C), and October the wettest (about 199 mm). These are long-run averages, not a forecast.
| Month | Avg high (°C) | Avg low (°C) | Rain (mm) | Sunshine (h/day) |
|---|---|---|---|---|
| January | 9.2 | -0.3 | 51 | 8.0 |
| February | 10.6 | 0.8 | 52 | 8.3 |
| March | 14.6 | 4.9 | 139 | 8.1 |
| April | 19.3 | 9.7 | 121 | 8.7 |
| May | 23.6 | 14.5 | 146 | 8.6 |
| June | 26.7 | 18.9 | 188 | 8.2 |
| July | 30.5 | 23.1 | 172 | 8.8 |
| August | 31.9 | 24.3 | 139 | 10.0 |
| September | 28.0 | 21.0 | 195 | 7.8 |
| October | 21.7 | 14.3 | 199 | 6.7 |
| November | 16.7 | 7.8 | 81 | 7.5 |
| December | 11.4 | 1.9 | 47 | 7.6 |
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People and places shaping Koshigaya
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Research updated Sunday, October 4, 2026Past and future events in Koshigaya
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Previously
- Documented history · 1657
Koshigaya-shuku prospered during the Edo period as a post station on the Nikkō Kaidō and the Ōshū Kaidō highways, and the town served as the temporary residence of the Tokugawa shōgun after the 1657 Great Fire of Meireki which destroyed Edo Castle.
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Interactive geography
See Koshigaya in context
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01 · Food & cultureFood and everyday culture in Koshigaya
How does Koshigaya engage in cultural exchange through global ties?
Koshigaya is a city located in Saitama Prefecture, Japan, with an estimated population of 345,353 as of 1 January 2021. Situated approximately 25 kilometers north of Tokyo within the alluvial plain of the Nakagawa basin, this municipality maintains international connections beyond its borders.
How does the municipality formalize its international relationships? Koshigaya maintains a sister city affiliation with Campbelltown, New South Wales, Australia, a relationship established on April 11, 1984. Through this cross-continental partnership, the Japanese core city engages with international communities, bridging geographic distances through municipal collaboration.
02 · HistoryHow Koshigaya took shape
Koshigaya is a city located in Saitama Prefecture, Japan. With an estimated population of 345,353, the municipality functions as a major regional commercial center.
How did historical transport networks shape the area?
During the Edo period, Koshigaya-shuku prospered as a post station along the Nikkō Kaidō and the Ōshū Kaidō highways. Because of its riverine connections to Edo, the locality developed early on as a vital transportation and transshipment hub for both water and land routes. Following the 1657 Great Fire of Meireki, which destroyed Edo Castle, the town even served as a temporary residence for the Tokugawa shōgun.
How does the city engage internationally?
Cultural and regional exchange is maintained through formal partnerships, notably highlighted by a sister city relationship established with Campbelltown in New South Wales, Australia, on April 11, 1984. Within Japan, the area is also famous for producing daruma dolls and has served as actual scenery set in media like the anime and manga series Miss Kobayashi's Dragon Maid under the name Oborozuka.
03 · EconomyWork and the economy in Koshigaya
How does Koshigaya drive its regional economy?
Koshigaya is a city located in Saitama Prefecture, Japan. It functions as a major regional commercial center supported by a diversified industrial base and an estimated population of 345,353 residents across 158,022 households as of January 1, 2021.
Beyond its commercial and industrial operations, the economic and cultural landscape of the city is linked to international interaction. Koshigaya maintains a sister city relationship with Campbelltown, New South Wales, Australia, established on April 11, 1984. Within its commercial sectors, local production is notably famous for manufacturing daruma dolls. Historically, economic activity grew from premodern times when the city developed as a water and land transportation hub, bolstered by its riverine connections with Edo and its prosperity as Koshigaya-shuku during the Edo period on the Nikkō Kaidō and Ōshū Kaidō highways.
04 · OverviewKoshigaya, in brief
Koshigaya is a city located in Saitama Prefecture, Japan. Situated within the country in the continent of Asia, the municipality operates under the Asia/Tokyo timezone using the currency of JPY and uses Japanese as its primary language.
Where is Koshigaya located and what defines its geography? Positioned in eastern Saitama Prefecture, the area sits in the alluvial plain of the Nakagawa basin between the Omiya plateau and the Shimosa plateau. The flat terrain features an average elevation of five meters above sea level and is crossed by several waterways, including the Motoara River, Naka River, Ayase River, Furutone River, and Sakagawa River.
What are the demographic and historical dimensions of the settlement? Census records show the population has grown rapidly since the 1960s. As of 1 January 2021, the municipality recorded an estimated population of 345,353 residents across 158,022 households, resulting in a density of 5,700 persons per square kilometer across its total area of 60.24 square kilometers. Historically, the area developed from a Jōmon period sea inlet and a Yayoi or early Kofun settlement into an Edo period post station on the Nikkō Kaidō and Ōshū Kaidō highways, eventually gaining city status on November 3, 1958, and core city status on April 1, 2015.
How does Koshigaya participate in cultural exchange? Cultural connections for the municipality extend internationally through a sister city relationship established with Campbelltown in New South Wales, Australia, on April 11, 1984. Domestically and internationally, the city engages cultural interest through its renown for producing daruma dolls, and its actual scenery serves as the setting for the anime and manga series Miss Kobayashi's Dragon Maid under the fictional name of Oborozuka.
Frequently Asked Questions about Koshigaya
Essential geographic, demographic, currency, and travel context verified from primary records.
01 · Q&AWhere is Koshigaya located and what are its coordinates?
Koshigaya is situated in Japan at geographic coordinates 35.8903, 139.7892, with an elevation monitored in regional geographic surveys.
02 · Q&AWhat is the population and time zone of Koshigaya?
Koshigaya has a recorded population of approximately 345,353 and observes the Asia/Tokyo time zone.
03 · Q&AWhat languages and currency are used in Koshigaya?
Official and commonly spoken languages in Koshigaya include Japanese, with JPY used for local transactions.
04 · Q&AHow can I check live conditions and daily updates for Koshigaya?
Today's Atlas provides continuous tracking for Koshigaya, featuring real-time weather conditions, daylight cycles, local geographic signals, and verified daily briefs.