Yonagunijima
与那国島24°28′ N 123°01′ EJMA1991-202020.7 to 23 °C
Table view
| Month | High °C | Low °C | Mean °C | Sea °C | Rain mm | Rain days | Sun h | Humidity % | Wind | m/s |
|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 20.7 | 16.6 | 18.5 | 23.9 | 187.2 | 15.8 | 52.8 | 75 | NNE | 7.9 |
| Feb | 21.3 | 17 | 19 | 23.7 | 163.6 | 13.6 | 60.3 | 76 | NNE | 7.6 |
| Mar | 23 | 18.3 | 20.5 | 24.3 | 163.7 | 13.4 | 88.1 | 77 | NNE | 6.9 |
| Apr | 25.5 | 20.9 | 23 | 25.4 | 153 | 11.1 | 104.7 | 79 | NNE | 6.2 |
| May | 28 | 23.4 | 25.4 | 26.9 | 207.3 | 11.3 | 142.3 | 81 | S | 5.3 |
| Jun | 30.3 | 26 | 27.9 | 28.4 | 162.3 | 9.9 | 182.3 | 83 | S | 5.5 |
| Jul | 31.7 | 26.8 | 28.9 | 29.4 | 125.3 | 8.4 | 257.9 | 80 | S | 5.5 |
| Aug | 31.4 | 26.4 | 28.7 | 29.4 | 213 | 10.4 | 227.4 | 81 | S | 5.2 |
| Sep | 30 | 25.3 | 27.5 | 28.8 | 285.7 | 11.7 | 180.9 | 79 | NNE | 6.3 |
| Oct | 27.8 | 23.6 | 25.4 | 27.6 | 238.5 | 10.8 | 132.2 | 75 | NNE | 7.7 |
| Nov | 25.3 | 21.3 | 23.1 | 26.3 | 222.6 | 13.6 | 86 | 76 | NNE | 7.6 |
| Dec | 22.2 | 18.2 | 20.1 | 24.8 | 200.8 | 15.7 | 59 | 74 | NNE | 8.2 |
Reading the seasons
Station
JMA's Yonagunijima station (block 47912) stands 30 m above sea level in Yonaguni town. Every figure in this file is JMA's published 1991–2020 normal, and rain days count the days with 1 mm or more.
Winter
Yonaguni has the strongest average wind of any station on this site. From December to March its most frequent wind blows from the north-north-east at 6.9–8.2 m/s on average, and the day's strongest wind reaches 10 m/s on 17.2 to 21.7 days a month. January brings only 52.8 hours of sunshine, with rain on 15.8 days. February averages a high of 21.3 °C and a low of 17.0 °C.
Spring
In early spring a low from the East China Sea sometimes deepens fast as it crosses Okinawa. Once its cold front passes, a southerly wind swings round to a strong north or north-east wind and the temperature drops. Okinawans have long called this *ningwachi kajimaai* (the wind turn of the second lunar month).
Summer
When the rainy season ends in late June the Pacific high pushes west and a strong south to south-west wind called *kaachiibee* blows steadily for several days. Yonaguni's most frequent wind from May to August comes from due south.
Typhoon
JMA counts a typhoon as approaching the Okinawa region when its centre comes within 300 km of a station there, and the 1991–2020 normal is 7.7 approaches a year. August averages 2.2 approaches and September 1.9. Across those 30 years JMA recorded no approach at all from January to March.
Rainy
JMA's 1991–2020 average puts the start of Okinawa's rainy season around 10 May and its end around 21 June. JMA's preliminary dates for 2026 were around 4 May and around 29 June. Okinawans call the season *suuman boosuu* after two of the old solar terms that fall inside it. September is Yonaguni's wettest month at 285.7 mm.
Sea
Sea temperatures are our monthly averages of JMA's daily 1991–2020 sea surface normals at its fixed point south of Yonaguni (与那国島南). The monthly figure runs from 23.7 °C in February up to 29.4 °C in July.
Wind
The windDir field holds JMA's most frequent wind direction (最多風向) for each month as the 16-point compass point the wind blows from.
Quick answers about Yonagunijimaよくある質問
What is the weather like in Yonagunijima in January to March?
In January to March, Yonagunijima averages daily highs of 20.7 to 23 °C and lows of 16.6 to 18.3 °C, with 164 to 187 mm of rain a month, by the Japan Meteorological Agency's 1991-2020 normals. The most frequent wind in January comes from the NNE at a mean 7.9 m/s.
Which month is warmest in Yonagunijima?
July is the warmest month in Yonagunijima, with an average daily high of 31.7 °C, by the Japan Meteorological Agency's 1991-2020 normals.
Which month is wettest in Yonagunijima?
September is the wettest month in Yonagunijima, with 285.7 mm of rain on average, by the Japan Meteorological Agency's 1991-2020 normals.