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Tamagawa

Travel guide

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Best time to visit Tamagawa

Data source：Meteostat
Last updated：2025-09

Weather in Tamagawa throughout the year

  • Spring (March–May): Average 11.3–19.8°C, mild and comfortable climate, but with relatively high rainfall, especially in April. Common activities: flower viewing, hiking. Recommended clothing: light jacket, long-sleeved shirt; bring rain gear.
  • Summer (June–August): Average 24.0–29.9°C, hot and humid, rainfall concentrated in June, gradually decreasing afterwards. Common activities: swimming, beach activities, visiting summer resorts. Recommended clothing: light and breathable clothing, short sleeves, shorts, sandals; bring rain gear.
  • Autumn (September–November): Average 20.1–14.9°C, comfortable and pleasant climate, reduced rainfall. Common activities: maple leaf viewing, mountain hiking. Recommended clothing: long-sleeved shirt, light jacket, comfortable shoes.
  • Winter (December–February): Average 8.6–7.0°C, cold and dry, least rainfall. Common activities: hot spring bathing, indoor activities. Recommended clothing: warm jacket, sweater, scarf, gloves.

Weather in Tamagawa

Annual average temperature: approx. 18°C / Annual rainfall: approx. 1334 mm / Summer humidity: 70%–80% / Rainiest month: June

Tamagawa weather by month

Month
Temperature (°C)
Rainfall (mm)
January
6.4°C
30
February
7°C
48
March
11.3°C
112
April
16.8°C
154.7
May
19.8°C
172.7
June
24°C
220
July
29°C
146.7
August
29.9°C
133.7
September
27.6°C
106.7
October
20.1°C
96
November
14.9°C
99
December
8.6°C
14.7

7-day weather forecast for Tamagawa

11/15
Sunday
Light rain
17.9°C/14.8°C
11/16
Monday
Patchy rain nearby
16.4°C/10.7°C
11/17
Tuesday
Overcast
17.8°C/8.5°C
11/18
Wednesday
Patchy rain nearby
17.1°C/12.7°C
11/19
Thursday
Patchy rain nearby
13.5°C/7.9°C
11/20
Friday
Patchy rain nearby
10.4°C/6.3°C
11/21
Saturday
Patchy rain nearby
12°C/6.4°C

Tamagawa travel FAQs and useful info

Where is Tamagawa located?

Tamagawa is located in the Tama Prefecture, on Seijima Island, within the country of Nakama. It is the capital city of Tama Prefecture and a significant urban center.

What is the meaning of the name Tamagawa?

The name Tamagawa can be translated as 'Jewel River.' This name is thought to originate from the Kawakamidani River that flows near the region, with 'gawa' signifying the flow of a river.

Is the Tamagawa Aqueduct still in use?

Yes, the Tamagawa Aqueduct, which extends approximately 43 kilometers from Hamura Weir to Yotsuya Okido in Shinjuku, is still in use. The upstream section continues to function as an active water conduit.

What are some key features of Tamagawa's geography?

Tamagawa is the largest city in Tama Prefecture and its combined urban area boasts an estimated population of over 500,000, making it the second-largest urban area in the Togan Region.

What is the historical significance of Tamagawa?

Tamagawa has a rich history, serving as the capital of Tama Prefecture and developing into a significant political and population center, particularly notable for its growth in the Edo period which predates its renaming.