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Monthly climate in Iwaki, Fukushima, Japan

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Iwaki features a humid subtropical climate (Cfa).Temperatures typically range between 5 °C (42 °F) and 25 °C (76 °F) through the year, but rarely can drop to -4 °C (26 °F) or can rise to as high as 30 °C (87 °F).The average annual precipitation amounts to about 1652 mm (65.0 inches) and receives 138 rainy days on the 1 mm (0.04 inches) threshold annually.Iwaki enjoys an average of 2997 hours of sunshine throughout the year, and daylight varies from 9 hours 39 minutes to 14 hours 38 minutes per day.

Monthly average temperatures in Iwaki, Fukushima, Japan §

The warmest months in Iwaki are July, August and September, with daily mean temperatures ranging from 22 to 25 °C (72 - 76 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 8 °C (42 - 46 °F) throughout the day. On average each year, Iwaki experiences 30 days above 25 °C (77.0 °F) and 3 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Iwaki, Fukushima, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 14°C
(58°F)		 17°C
(63°F)		 18°C
(64°F)		 21°C
(70°F)		 23°C
(74°F)		 26°C
(78°F)		 30°C
(86°F)		 30°C
(87°F)		 29°C
(84°F)		 26°C
(78°F)		 20°C
(68°F)		 18°C
(65°F)
Mean maximum 12°C
(55°F)		 14°C
(57°F)		 16°C
(60°F)		 19°C
(66°F)		 22°C
(72°F)		 23°C
(74°F)		 27°C
(80°F)		 29°C
(84°F)		 27°C
(81°F)		 24°C
(76°F)		 19°C
(67°F)		 16°C
(61°F)
Average high 7°C
(46°F)		 8°C
(47°F)		 11°C
(52°F)		 14°C
(57°F)		 18°C
(65°F)		 20°C
(69°F)		 23°C
(75°F)		 26°C
(79°F)		 23°C
(74°F)		 19°C
(67°F)		 15°C
(59°F)		 10°C
(50°F)
Daily mean 5°C
(42°F)		 6°C
(42°F)		 8°C
(47°F)		 11°C
(53°F)		 16°C
(61°F)		 19°C
(66°F)		 22°C
(72°F)		 25°C
(76°F)		 22°C
(72°F)		 18°C
(64°F)		 13°C
(55°F)		 8°C
(46°F)
Average low 3°C
(38°F)		 3°C
(38°F)		 6°C
(43°F)		 9°C
(49°F)		 14°C
(58°F)		 17°C
(63°F)		 21°C
(70°F)		 23°C
(74°F)		 21°C
(69°F)		 16°C
(61°F)		 11°C
(51°F)		 5°C
(42°F)
Mean minimum -0°C
(31°F)		 -0°C
(32°F)		 2°C
(36°F)		 4°C
(40°F)		 10°C
(50°F)		 14°C
(58°F)		 18°C
(65°F)		 20°C
(69°F)		 17°C
(63°F)		 12°C
(53°F)		 5°C
(42°F)		 1°C
(35°F)
Minimum -4°C
(26°F)		 -1°C
(30°F)		 1°C
(34°F)		 3°C
(38°F)		 9°C
(48°F)		 13°C
(56°F)		 17°C
(63°F)		 18°C
(65°F)		 15°C
(60°F)		 10°C
(51°F)		 4°C
(39°F)		 0°C
(33°F)

Compare climate in Iwaki with other places

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

Monthly average precipitation in Iwaki, Fukushima, Japan §

Iwaki usually has the most precipitation in July, September and October, with an average of 16 rainy days and 220 mm (8.7 inches) of precipitation per month.The driest months in Iwaki are January, February and December. On average, 58 mm (2.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Iwaki, Fukushima, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 57 (2.2) 45 (1.8) 169 (6.6) 136 (5.4) 154 (6.1) 136 (5.3) 202 (8.0) 137 (5.4) 186 (7.3) 271 (10.7) 85 (3.4) 73 (2.9)
Average precipitation days (≥ 1 mm) 6 8 10 12 12 12 17 13 16 15 8 9

Monthly sunshine hours in Iwaki, Fukushima, Japan §

The sunniest months in Iwaki are May, June and August, when the sun shines an average of 9 hours 25 minutes a day.Least sunny months in Iwaki: January, October and December receive an average of 6 hours 37 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Iwaki, Fukushima, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 182 231 265 279 293 280 261 293 247 213 230 219
Mean daily daylight hours 9h 55m 10h 48m 11h 57m 13h 8m 14h 8m 14h 38m 14h 23m 13h 31m 12h 23m 11h 12m 10h 10m 9h 39m

Solar UV radiation in Iwaki, Fukushima, Japan §

Iwaki experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / 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 Iwaki UV Index data.

Average daily maximum UV levels by month for Iwaki, Fukushima, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 10 11 11 9 6 5 3