Climate of Iwate Prefecture, Japan
Area-weighted average across Iwate Prefecture. For where people actually live and travel, see the cities below.
Iwate Prefecture, a subdivision of Japan, has a strongly continental climate on average. Area-weighted monthly temperatures across the whole territory range from -3.6°C / 25.5°F in January to 21.4°C / 70.5°F in August, with rainfall from 66 mm / 2.6 in to 181 mm / 7.1 in depending on the season (1366 mm / 53.8 in total across the year). See the city listed below for point-value climate at specific locations — these often differ from the area-weighted average, especially in geographically diverse subdivisions.
| Month | Temperature | Rainfall | Matches |
|---|---|---|---|
| January | -3.6°C25.5°F | 67 mm2.6″ | Snowy |
| February | -3.2°C26.2°F | 66 mm2.6″ | Snowy |
| March | 0°C32°F | 84 mm3.3″ | Snowy |
| April | 6.4°C43.5°F | 103 mm4.1″ | — |
| May | 11.7°C53.1°F | 106 mm4.2″ | — |
| June | 15.6°C60.1°F | 129 mm5.1″ | — |
| July | 19.8°C67.6°F | 170 mm6.7″ | — |
| August | 21.4°C70.5°F | 171 mm6.7″ | — |
| September | 16.9°C62.4°F | 181 mm7.1″ | — |
| October | 10.7°C51.3°F | 124 mm4.9″ | — |
| November | 4.9°C40.8°F | 90 mm3.5″ | — |
| December | -0.5°C31.1°F | 75 mm3″ | Snowy |
Frequently asked questions
What is the best time to visit Iwate Prefecture?
Iwate Prefecture, Japan does not have a clear sunny-and-dry window by our cutoffs. The warmest month is August at 21.4°C / 70.5°F, and the driest is February at 66 mm / 2.6 in — likely your best travel window. For city-level detail, see the cities section below.
What is the climate of Iwate Prefecture?
Iwate Prefecture, Japan has area-weighted monthly average temperatures ranging from -3.6°C / 25.5°F in January to 21.4°C / 70.5°F in August. Annual rainfall averages about 1366 mm / 53.8 in, with the wettest month being September (181 mm / 7.1 in) and the driest February (66 mm / 2.6 in). Because this is an area average across the whole subdivision, local city values can differ substantially.
What is the hottest month in Iwate Prefecture?
The hottest month in Iwate Prefecture is August, with an area-wide average temperature of 21.4°C / 70.5°F.
What is the coldest month in Iwate Prefecture?
The coldest month in Iwate Prefecture is January, with an area-wide average temperature of -3.6°C / 25.5°F.
When does it rain most in Iwate Prefecture?
The wettest month in Iwate Prefecture is September, averaging about 181 mm / 7.1 in of rainfall. The driest is February with about 66 mm / 2.6 in.