Izumo climate
Izumo (Japan) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 17 °C62 °F, and about 1,793 mm71 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Izumo climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 948 | 744 | 846 | 1124.4 |
| Feb | 949 | 744 | 846 | 1044.1 |
| Mar | 1153 | 847 | 1050 | 1174.6 |
| Apr | 1559 | 1254 | 1457 | 1275.0 |
| May | 1966 | 1661 | 1864 | 1375.4 |
| Jun | 2272 | 2068 | 2170 | 2088.2 |
| Jul | 2679 | 2475 | 2577 | 2409.4 |
| Aug | 2883 | 2679 | 2781 | 1566.1 |
| Sep | 2577 | 2374 | 2475 | 2138.4 |
| Oct | 2170 | 1966 | 2068 | 1345.3 |
| Nov | 1762 | 1457 | 1560 | 1104.3 |
| Dec | 1253 | 948 | 1051 | 1385.4 |
| Year | 2883 | 744 | 1762 | 1,79371 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 74% | 89% | 1.8 | 10:01 |
| Feb | 73% | 84% | 2.5 | 10:51 |
| Mar | 73% | 76% | 3.7 | 11:52 |
| Apr | 76% | 71% | 4.8 | 13:02 |
| May | 81% | 71% | 5.3 | 14:01 |
| Jun | 84% | 79% | 5.0 | 14:32 |
| Jul | 88% | 76% | 4.9 | 14:19 |
| Aug | 82% | 67% | 5.1 | 13:29 |
| Sep | 78% | 73% | 4.0 | 12:21 |
| Oct | 72% | 71% | 3.3 | 11:13 |
| Nov | 72% | 77% | 2.2 | 10:15 |
| Dec | 74% | 87% | 1.6 | 9:47 |
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 Izumo is like
The warmest month is August, with an average high of 28 °C83 °F and a low of 26 °C79 °F. The coldest is January, when highs average 9 °C48 °F and lows 7 °C44 °F. Seasons are strongly marked: the warmest month is on average 19.2 °C34.6 °F warmer than the coldest.
It is wet, with about 1,793 mm71 in of precipitation per year. The wettest three-month stretch is July–September, which brings 34% of the annual total. The wettest month is July (240 mm9.4 in), the driest is February (104 mm4.1 in).
Relative humidity ranges from 72% in November to 88% in July. The clearest skies (lowest average cloud amount, 67%) are typical of August. Average wind speed near the ground ranges from 14 km/h (8 mph) in June to 24 km/h (15 mph) in December. Daylight lasts from about 9.8 hours in December to 14.5 hours in June.
A lasting snow cover is typical in January, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 10 cm).
Best time to visit Izumo
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October: average highs of 21 °C70 °F to 21 °C70 °F with 134 mm5.3 in to 134 mm5.3 in of precipitation per month.
The most challenging month is July, which is very wet (240 mm9.4 in) and humid (88% relative humidity).
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 Izumo
- Winter (December–February) — highs 948 to 12 °C53 °F, lows 744 to 9 °C48 °F, about 118 mm4.6 in of precipitation a month. Pack a warm coat, layers and closed shoes and an umbrella or light rain jacket.
- Spring (March–May) — highs 1153 to 19 °C66 °F, lows 847 to 16 °C61 °F, about 127 mm5.0 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 2272 to 28 °C83 °F, lows 2068 to 26 °C79 °F, about 201 mm7.9 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 1762 to 25 °C77 °F, lows 1457 to 23 °C74 °F, about 152 mm6.0 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Izumo compares
Compared with Matsue, about 29 km to the northeast, Izumo is on average 0.5 °C0.8 °F warmer and receives a similar amount of precipitation. The difference is largest in December (1.7 °C3.1 °F warmer).
Of the 111 places in Japan covered by World Climates, Izumo is the 27th warmest by annual mean temperature and the 41st 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: Jeju City (South Korea, Cfa), Zhoushan (China, Cfa) and Gijang (South Korea, Cfa).
Nearby places
- Matsue 29 km · 16 °C61 °F · 1,740 mm68 in
- Hiroshima 111 km · 15 °C60 °F · 1,556 mm61 in
- Fukuyama 112 km · 16 °C61 °F · 1,526 mm60 in
- Tsuyama 117 km · 14 °C58 °F · 1,488 mm59 in
- Kure 127 km · 16 °C61 °F · 1,621 mm64 in
- Okayama 133 km · 16 °C61 °F · 1,466 mm58 in
- Tottori-shi 134 km · 16 °C60 °F · 1,806 mm71 in
- Imabari 146 km · 17 °C62 °F · 1,699 mm67 in
Frequently asked questions
What is the warmest month in Izumo?
August is the warmest month in Izumo, with an average high of 28 °C (83 °F) and an average low of 26 °C (79 °F).
What is the coldest month in Izumo?
January is the coldest month, with an average high of 9 °C (48 °F) and an average low of 7 °C (44 °F).
When does it rain the most in Izumo?
July is the wettest month with about 240 mm (9.4 in) of precipitation; February is the driest with about 104 mm (4.1 in).
What is the best time to visit Izumo?
Judging by long-term averages, the most comfortable months are October.
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.