Kumejima
久米島26°20′ N 126°48′ EJMA1991-202019.5 to 21.8 °C
Table view
| Month | High °C | Low °C | Mean °C | Sea °C | Rain mm | Rain days | Sun h | Humidity % | Wind | m/s |
|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 19.5 | 14.6 | 17 | 22.8 | 138.3 | 12.7 | 75.2 | 68 | N | 4.2 |
| Feb | 20 | 14.8 | 17.3 | 22.1 | 141.2 | 11.7 | 80.1 | 70 | N | 4.2 |
| Mar | 21.8 | 16.3 | 19 | 22.4 | 195.5 | 13 | 107.6 | 73 | N | 4.1 |
| Apr | 24.3 | 19 | 21.5 | 23.6 | 196.8 | 11.5 | 118.4 | 76 | N | 4.1 |
| May | 27 | 21.8 | 24.2 | 25.3 | 260.3 | 12 | 136.2 | 80 | ENE | 3.7 |
| Jun | 29.9 | 25.1 | 27.2 | 27.3 | 307.4 | 11.2 | 158.9 | 84 | SSW | 4 |
| Jul | 32 | 26.7 | 29 | 29.1 | 154.4 | 7.9 | 250.3 | 80 | SSW | 4 |
| Aug | 31.8 | 26.5 | 28.9 | 29.3 | 197.7 | 9.8 | 231.9 | 80 | SE | 3.8 |
| Sep | 30.5 | 25.3 | 27.7 | 28.6 | 235.6 | 10.6 | 198.6 | 78 | NE | 3.7 |
| Oct | 27.9 | 23.2 | 25.3 | 27.2 | 152.7 | 8.6 | 162.3 | 73 | NE | 4 |
| Nov | 24.9 | 20.3 | 22.4 | 25.7 | 129.6 | 9 | 108.3 | 70 | NE | 4.1 |
| Dec | 21.4 | 16.6 | 19 | 24.2 | 134 | 10.7 | 89.9 | 68 | N | 4.1 |
Reading the seasons
Station
JMA's Kumejima observatory (block 47929) stands 4.6 m above sea level in the Higa district of Kumejima 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
Due north is the most frequent wind at Kumejima from December to April, averaging 4.1–4.2 m/s. The day's strongest wind reaches 10 m/s on about 1 day a month in winter, far fewer than at Naha. January gets 75.2 hours of sunshine and February 80.1, and rain falls on 12.7 days in January and 11.7 in February.
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.
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. June is Kumejima's wettest month at 307.4 mm.
Sea
Sea temperatures are our monthly averages of JMA's daily 1991–2020 sea surface normals at its fixed point south-east of Kume-jima (久米島南). The monthly figure runs from 22.1 °C in February up to 29.3 °C in August.
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 Kumejimaよくある質問
What is the weather like in Kumejima in January to March?
In January to March, Kumejima averages daily highs of 19.5 to 21.8 °C and lows of 14.6 to 16.3 °C, with 138 to 196 mm of rain a month, by the Japan Meteorological Agency's 1991-2020 normals. The most frequent wind in January comes from the N at a mean 4.2 m/s.
Which month is warmest in Kumejima?
July is the warmest month in Kumejima, with an average daily high of 32 °C, by the Japan Meteorological Agency's 1991-2020 normals.
Which month is wettest in Kumejima?
June is the wettest month in Kumejima, with 307.4 mm of rain on average, by the Japan Meteorological Agency's 1991-2020 normals.