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Monthly climate in Tachikawa, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Tachikawa features a humid subtropical climate (Cfa). Temperatures typically range between 4 °C (40 °F) and 28 °C (82 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 38 °C (100 °F). The average annual precipitation amounts to about 1654 mm (65.1 inches) and receives 152 rainy days on the 1 mm (0.04 inches) threshold annually. Tachikawa enjoys an average of 2925 hours of sunshine throughout the year, and daylight varies from 9 hours 45 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Tachikawa, Japan

The warmest months in Tachikawa are July, August and September, with daily mean temperatures ranging from 23 to 28 °C (74 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 7 °C (40 - 44 °F) throughout the day. On average each year, Tachikawa experiences 94 days above 25 °C (77.0 °F) and 37 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Tachikawa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum19°C
(66°F)		22°C
(71°F)		24°C
(76°F)		27°C
(81°F)		31°C
(89°F)		32°C
(90°F)		38°C
(100°F)		37°C
(99°F)		36°C
(97°F)		31°C
(89°F)		24°C
(75°F)		22°C
(71°F)
Mean maximum16°C
(62°F)		18°C
(65°F)		22°C
(71°F)		26°C
(79°F)		29°C
(85°F)		29°C
(85°F)		34°C
(94°F)		36°C
(97°F)		34°C
(93°F)		28°C
(84°F)		22°C
(72°F)		19°C
(66°F)
Average high9°C
(49°F)		11°C
(52°F)		15°C
(58°F)		18°C
(66°F)		23°C
(74°F)		26°C
(79°F)		29°C
(85°F)		31°C
(89°F)		27°C
(80°F)		21°C
(71°F)		17°C
(63°F)		12°C
(53°F)
Daily mean4°C
(40°F)		6°C
(42°F)		10°C
(50°F)		14°C
(57°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		23°C
(74°F)		18°C
(64°F)		12°C
(55°F)		7°C
(44°F)
Average low-0°C
(32°F)		1°C
(34°F)		5°C
(41°F)		9°C
(49°F)		15°C
(59°F)		19°C
(66°F)		23°C
(74°F)		25°C
(76°F)		20°C
(69°F)		15°C
(59°F)		8°C
(47°F)		3°C
(37°F)
Mean minimum-5°C
(24°F)		-3°C
(26°F)		-1°C
(30°F)		3°C
(38°F)		8°C
(46°F)		15°C
(60°F)		19°C
(67°F)		20°C
(68°F)		15°C
(60°F)		8°C
(48°F)		2°C
(35°F)		-3°C
(28°F)
Minimum-9°C
(16°F)		-4°C
(25°F)		-4°C
(26°F)		1°C
(34°F)		5°C
(42°F)		13°C
(55°F)		17°C
(63°F)		17°C
(62°F)		13°C
(55°F)		7°C
(44°F)		-0°C
(32°F)		-4°C
(25°F)

Compare climate in Tachikawa with other places

Compare temperature, precipitation, sunshine, UV index in Tachikawa, Japan with other places around the world.

Monthly average precipitation in Tachikawa, Japan

Tachikawa usually has the most precipitation in July, September and October, with an average of 18 rainy days and 248 mm (9.8 inches) of precipitation per month. The driest months in Tachikawa are January, February and December. On average, 51 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Tachikawa. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.8)50 (2.0)144 (5.7)126 (5.0)117 (4.6)168 (6.6)252 (9.9)133 (5.3)201 (7.9)291 (11.4)69 (2.7)55 (2.2)
Average precipitation days (≥ 1 mm)58131212152017191687

Monthly sunshine hours in Tachikawa, Japan

The sunniest months in Tachikawa are April, May and August, when the sun shines an average of 9 hours 12 minutes a day. Least sunny months in Tachikawa: January, October and November receive an average of 6 hours 46 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tachikawa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours190232259273284262233288235202230231
Mean daily daylight hours10h 1m10h 52m11h 57m13h 5m14h 2m14h 31m14h 17m13h 27m12h 22m11h 15m10h 16m9h 45m

Solar UV radiation in Tachikawa, Japan

Tachikawa experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Tachikawa UV Index data.

Average daily maximum UV levels by month for Tachikawa. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)35891111111110754