Ōsaki climate
Ōsaki (Japan) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 12 °C54 °F, and about 1,316 mm52 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Ōsaki climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 438 | −228 | 133 | 783.1 | 24 |
| Feb | 440 | −229 | 134 | 532.1 | 22 |
| Mar | 847 | 133 | 440 | 833.3 | 15 |
| Apr | 1457 | 541 | 949 | 1014.0 | 1 |
| May | 1966 | 1051 | 1558 | 1014.0 | 0 |
| Jun | 2373 | 1559 | 1966 | 1164.6 | 0 |
| Jul | 2679 | 1967 | 2373 | 1766.9 | 0 |
| Aug | 2882 | 2170 | 2476 | 1395.5 | 0 |
| Sep | 2476 | 1864 | 2170 | 1405.5 | 0 |
| Oct | 1966 | 1253 | 1560 | 1515.9 | 0 |
| Nov | 1355 | 542 | 949 | 863.4 | 1 |
| Dec | 744 | 133 | 438 | 933.7 | 14 |
| Year | 2882 | −228 | 1254 | 1,31652 | 78 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 85% | 81% | 1.7 | 9:45 |
| Feb | 82% | 79% | 2.5 | 10:42 |
| Mar | 79% | 75% | 3.5 | 11:51 |
| Apr | 79% | 71% | 4.5 | 13:10 |
| May | 81% | 72% | 5.0 | 14:15 |
| Jun | 83% | 77% | 4.9 | 14:51 |
| Jul | 85% | 83% | 4.3 | 14:36 |
| Aug | 84% | 74% | 4.4 | 13:39 |
| Sep | 83% | 76% | 3.6 | 12:23 |
| Oct | 81% | 71% | 2.9 | 11:07 |
| Nov | 83% | 72% | 2.0 | 10:01 |
| Dec | 85% | 80% | 1.5 | 9:29 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Ōsaki is like
The warmest month is August, with an average high of 28 °C82 °F and a low of 21 °C70 °F. The coldest is January, when highs average 4 °C38 °F and lows −2 °C28 °F. Seasons are strongly marked: the warmest month is on average 23.5 °C42.3 °F warmer than the coldest.
It is wet, with about 1,316 mm52 in of precipitation per year. The wettest three-month stretch is July–September, which brings 35% of the annual total. The wettest month is July (176 mm6.9 in), the driest is February (53 mm2.1 in).
Relative humidity ranges from 79% in April to 85% in July. The clearest skies (lowest average cloud amount, 71%) are typical of April. Average wind speed near the ground ranges from 9 km/h (6 mph) in July to 16 km/h (10 mph) in January. Daylight lasts from about 9.5 hours in December to 14.8 hours in June.
A lasting snow cover is typical in December–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 17 cm).
Best time to visit Ōsaki
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and June: average highs of 19 °C66 °F to 23 °C73 °F with 101 mm4.0 in to 116 mm4.6 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 4 °C38 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Ōsaki
- Winter (December–February) — highs 438 to 7 °C44 °F, lows −228 to 1 °C33 °F, about 74 mm2.9 in of precipitation a month. Pack a warm coat, layers and closed shoes and shoes with good grip, as frost is common.
- Spring (March–May) — highs 847 to 19 °C66 °F, lows 133 to 10 °C51 °F, about 95 mm3.7 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2373 to 28 °C82 °F, lows 1559 to 21 °C70 °F, about 144 mm5.7 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1355 to 24 °C76 °F, lows 542 to 18 °C64 °F, about 126 mm4.9 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Ōsaki compares
Compared with Ishinomaki, about 34 km to the southeast, Ōsaki has practically the same average temperature and receives a similar amount of precipitation.
Of the 111 places in Japan covered by World Climates, Ōsaki is the 91st warmest by annual mean temperature and the 102nd wettest by annual precipitation. See all of them on the Japan climate page.
Places in other countries with the most similar temperature and rainfall pattern: Brooklyn (United States, Cfa), New York City (United States, Cfa) and Bridgeport (United States, Cfa).
Nearby places
- Ishinomaki 34 km · 12 °C54 °F · 1,316 mm52 in
- Sendai 37 km · 12 °C53 °F · 1,547 mm61 in
- Ichinoseki 39 km · 11 °C52 °F · 1,411 mm56 in
- Oshu 64 km · 11 °C52 °F · 1,411 mm56 in
- Yamagata 66 km · 10 °C51 °F · 1,363 mm54 in
- Tsuruoka 101 km · 12 °C54 °F · 1,581 mm62 in
- Fukushima 103 km · 12 °C54 °F · 1,363 mm54 in
- Sakata 104 km · 12 °C54 °F · 1,767 mm70 in
Frequently asked questions
What is the warmest month in Ōsaki?
August is the warmest month in Ōsaki, with an average high of 28 °C (82 °F) and an average low of 21 °C (70 °F).
What is the coldest month in Ōsaki?
January is the coldest month, with an average high of 4 °C (38 °F) and an average low of -2 °C (28 °F).
When does it rain the most in Ōsaki?
July is the wettest month with about 176 mm (6.9 in) of precipitation; February is the driest with about 53 mm (2.1 in).
What is the best time to visit Ōsaki?
Judging by long-term averages, the most comfortable months are May and June.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.