nomadseason

Monthly climate in Bibai, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Bibai features a humid continental climate (Dfb). Temperatures typically range between -6 °C (21 °F) and 21 °C (70 °F) through the year, but rarely can drop to -22 °C (-7 °F) or can rise to as high as 32 °C (91 °F). The average annual precipitation amounts to about 1087 mm (42.8 inches) and receives 172 rainy days on the 1 mm (0.04 inches) threshold annually. Bibai enjoys an average of 2880 hours of sunshine throughout the year, and daylight varies from 9 hours 1 minutes to 15 hours 18 minutes per day.

Monthly average temperatures in Bibai, Japan

The warmest months in Bibai are July, August and September, with daily mean temperatures ranging from 18 to 21 °C (64 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -3 °C (21 - 27 °F) throughout the day. On average each year, Bibai experiences 23 days above 25 °C (77.0 °F) and 127 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Bibai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum7°C
(44°F)		6°C
(43°F)		15°C
(59°F)		22°C
(72°F)		30°C
(86°F)		27°C
(81°F)		32°C
(91°F)		32°C
(90°F)		30°C
(86°F)		24°C
(75°F)		17°C
(63°F)		13°C
(56°F)
Mean maximum4°C
(39°F)		5°C
(41°F)		12°C
(53°F)		19°C
(66°F)		24°C
(76°F)		24°C
(75°F)		30°C
(85°F)		30°C
(86°F)		27°C
(81°F)		21°C
(71°F)		16°C
(61°F)		9°C
(49°F)
Average high-3°C
(28°F)		-1°C
(30°F)		4°C
(40°F)		11°C
(52°F)		17°C
(62°F)		20°C
(68°F)		24°C
(76°F)		24°C
(76°F)		22°C
(71°F)		15°C
(60°F)		8°C
(47°F)		0°C
(32°F)
Daily mean-6°C
(21°F)		-5°C
(24°F)		1°C
(34°F)		7°C
(44°F)		13°C
(55°F)		16°C
(61°F)		20°C
(69°F)		21°C
(70°F)		18°C
(64°F)		11°C
(53°F)		5°C
(41°F)		-3°C
(27°F)
Average low-10°C
(14°F)		-8°C
(17°F)		-3°C
(26°F)		2°C
(36°F)		9°C
(48°F)		12°C
(55°F)		17°C
(63°F)		18°C
(64°F)		13°C
(56°F)		7°C
(45°F)		1°C
(35°F)		-6°C
(22°F)
Mean minimum-18°C
(-0°F)		-16°C
(3°F)		-12°C
(11°F)		-3°C
(26°F)		3°C
(37°F)		8°C
(46°F)		13°C
(57°F)		11°C
(52°F)		7°C
(44°F)		0°C
(32°F)		-5°C
(23°F)		-14°C
(7°F)
Minimum-22°C
(-7°F)		-19°C
(-2°F)		-15°C
(6°F)		-5°C
(24°F)		2°C
(35°F)		5°C
(41°F)		10°C
(50°F)		10°C
(50°F)		4°C
(40°F)		-2°C
(29°F)		-8°C
(17°F)		-16°C
(3°F)

Compare climate in Bibai with other places

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

Monthly average precipitation in Bibai, Japan

Bibai usually has the most precipitation in August, October and November, with an average of 16 rainy days and 133 mm (5.2 inches) of precipitation per month. The driest months in Bibai are January, February and April. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Bibai. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)48 (1.9)61 (2.4)75 (2.9)72 (2.8)89 (3.5)91 (3.6)84 (3.3)164 (6.5)85 (3.3)120 (4.7)115 (4.5)84 (3.3)
Average precipitation days (≥ 1 mm)141711121211101313152123

Monthly sunshine hours in Bibai, Japan

The sunniest months in Bibai are May, June and July, when the sun shines an average of 9 hours 54 minutes a day. Least sunny months in Bibai: January, November and December receive an average of 5 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Bibai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours135190242281303293315284265229176163
Mean daily daylight hours9h 22m10h 29m11h 56m13h 24m14h 40m15h 18m14h 59m13h 53m12h 28m11h 0m9h 42m9h 1m

Solar UV radiation in Bibai, Japan

Bibai experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Bibai UV Index data.

Average daily maximum UV levels by month for Bibai. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)2367899108532