Dry-day rate calendar for June
Period: observations for 1996–2025 (30 years)
This is the month of the rainy season. In the 1996–2025 records, the area with many rainy days spreads from Okinawa and Amami to Honshu, and the dry-day rates in western / eastern Japan fall to some of the lowest levels in the annual cycle. Hokkaido does not drop as much as Honshu, so the north–south gap shows up large.
The "dry-day rate" is the share of years in which a given day had no precipitation (rain or snow) of 1 mm or more (daily rainfall under 1 mm, smoothed over the 4 days before and after).
These are statistics compiled from observations for 1996–2025 (30 years), not a weather forecast for any particular day. For the latest forecasts, see the JMA website.
June at a glance
The station with the highest monthly average dry-day rate in Japan, the national median, and the station with the lowest. The most comfortable stations this month: Otaru / Asahikawa / Ajigasawa (details in the comfort section below).
Dry-day rates across Japan (June average)
Each dot is 1 station. The highest and lowest stations are labeled on the map, and the top and bottom lists are below.
Daily calendar for major stations
The deeper the amber, the more years that day stayed dry (the colors match the legend above). The table below (averages for the early, middle, and late parts of the month) has the same values.
| Station | Early | Mid | Late | Monthly avg. | 2 days in a row | 3 days in a row | Windy days | Sunshine (avg.) |
|---|---|---|---|---|---|---|---|---|
| Sapporo | 73.2% | 72.3% | 76.0% | 73.8% | 59.1% | 47.0% | 16.8% | 6.2 hours |
| Sendai | 74.2% | 64.9% | 61.9% | 67.0% | 49.2% | 35.3% | 2.4% | 5.2 hours |
| Niigata | 77.3% | 70.0% | 62.4% | 69.9% | 53.2% | 40.3% | 5.8% | 6.2 hours |
| Kanazawa | 76.1% | 65.7% | 54.7% | 65.5% | 47.9% | 35.8% | 10.3% | 5.8 hours |
| Tokyo | 68.4% | 58.7% | 60.0% | 62.4% | 42.3% | 28.9% | 3.6% | 4.5 hours |
| Nagoya | 71.0% | 57.4% | 53.5% | 60.6% | 41.6% | 27.7% | 2.9% | 5.2 hours |
| Osaka | 72.0% | 58.9% | 56.2% | 62.4% | 43.3% | 30.2% | 1.7% | 5.4 hours |
| Hiroshima | 71.0% | 66.0% | 55.0% | 64.0% | 45.8% | 32.3% | 2.2% | 5.2 hours |
| Takamatsu | 73.9% | 65.6% | 58.1% | 65.8% | 47.7% | 35.1% | 0.8% | 5.4 hours |
| Fukuoka | 74.8% | 62.4% | 47.6% | 61.6% | 45.3% | 32.8% | 1.7% | 5.0 hours |
| Kagoshima | 60.9% | 44.4% | 39.0% | 48.1% | 29.5% | 17.7% | 4.9% | 3.7 hours |
| Naha | 51.0% | 56.1% | 71.4% | 59.5% | 44.8% | 34.9% | 57.4% | 5.2 hours |
"2 days in a row" and "3 days in a row" are the monthly averages of the share of years in which it stayed dry for 2 / 3 days starting that day (counted from the actual consecutive records, not by multiplying each day's share). They are a guide for multi-night trips and outdoor plans. "Windy days" is the share of days with a daily mean wind speed of 5 m/s or more. The sunshine averages include estimates from March 2021 onward at some stations.
Stations with the highest and lowest dry-day rates (June average)
Highest
Otaru / Chichijima Island / Hakodate / Sapporo / Kuroishi / Wakkanai / Nemuro / Aomori-Otani / Obihiro / Rumoi
Lowest
Yakushima Island / Uchinoura / Kihoku / Nishimera / Tashiro / Kimotsuki-Maeda / Makinohara / Kanoya / Kakuto / Shibushi
Comfort in June (5 levels)
Based on observations of dry-day rate, sunshine, wind, and temperature for 1996–2025 (30 years), each station is rated on 5 levels of comfort for June. The tables also show the values behind each rating and the factor that lowered it most (the main factor). Some stations with short sunshine records are not rated.
Each dot is 1 station. The colors match the levels in the legend. The top and bottom lists are below.
Most comfortable stations (top)
| Station | Level | Main factor | Dry-day rate | Sunshine (avg.) | Windy days | High (avg.) | Low (avg.) |
|---|---|---|---|---|---|---|---|
| Otaru | Comfortable | None | 74.9% | 5.9 hours | 0.8% | 20.9°C | 12.8°C |
| Asahikawa | Comfortable | None | 71.1% | 6.0 hours | 3.0% | 23.2°C | 12.1°C |
| Ajigasawa | Comfortable | None | 69.2% | 6.1 hours | 0.3% | 21.6°C | 13.7°C |
| Goshogawara | Comfortable | None | 71.6% | 5.9 hours | 0.5% | 23.1°C | 14.6°C |
| Hirosaki | Comfortable | None | 72.7% | 5.8 hours | 0.0% | 24.1°C | 14.1°C |
| Abashiri | Comfortable | None | 69.9% | 6.0 hours | 3.9% | 18.2°C | 10.6°C |
| Iwamizawa | Comfortable | None | 72.5% | 6.0 hours | 9.2% | 22.1°C | 12.3°C |
| Niigata | Comfortable | None | 69.9% | 6.2 hours | 5.8% | 25.2°C | 18.0°C |
| Aikawa | Comfortable | None | 70.1% | 6.2 hours | 7.5% | 23.7°C | 16.9°C |
| Fukaura | Comfortable | None | 68.5% | 6.1 hours | 5.3% | 21.9°C | 14.4°C |
Harshest stations (bottom)
| Station | Level | Main factor | Dry-day rate | Sunshine (avg.) | Windy days | High (avg.) | Low (avg.) |
|---|---|---|---|---|---|---|---|
| Ishigakijima Island | Harsh | Heat | 70.4% | 7.0 hours | 47.6% | 31.0°C | 26.7°C |
| Naha | Harsh | Heat | 59.5% | 5.2 hours | 57.4% | 29.8°C | 25.3°C |
| Yonagunijima Island | Harsh | Heat | 65.4% | 6.1 hours | 58.3% | 30.4°C | 26.1°C |
| Ibaruma | Harsh | Heat | 64.0% | 5.4 hours | 16.8% | 30.6°C | 26.0°C |
| Hateruma | Harsh | Heat | 68.4% | 6.4 hours | 32.1% | 30.9°C | 26.2°C |
| Ohara | Harsh | Heat | 67.2% | 5.7 hours | 22.1% | 30.9°C | 25.9°C |
| Naze | Tough | Heat | 46.7% | 3.8 hours | 1.2% | 29.5°C | 23.6°C |
| Miyakojima Island | Tough | Heat | 65.8% | 6.4 hours | 35.4% | 30.4°C | 25.9°C |
| Nago | Tough | Heat | 56.0% | 5.0 hours | 21.9% | 29.6°C | 25.0°C |
| Iriomotejima Island | Tough | Heat | 66.1% | 6.3 hours | 28.7% | 30.6°C | 25.8°C |
Stations are ordered by their rating from the observations. "Windy days" is the share of days with a daily mean wind speed of 5 m/s or more, and "Sunshine (avg.)" is the monthly average of daily sunshine hours (including estimates from March 2021 onward at some stations).
Typhoon approaches in June (5 broad areas)
| Area | Total approach days (1951–2025) |
|---|---|
| Hokkaido | 5 days |
| Honshu | 31 days |
| Shikoku | 24 days |
| Kyushu | 37 days |
| Okinawa and Amami | 99 days |
The total number of days in June on which the center of a typhoon came within 300 km of a staffed weather station in each area, from 75 years of confirmed records. The bars compare the areas within this table, with the busiest area drawn longest. The Izu and Ogasawara Islands are not included in Honshu (listed separately).
Typhoon approach calendar / Look up past typhoons by date range
What makes June distinctive
The June records split cleanly between north and south. In measurements over the 30 years 1996–2025, the stations with high dry-day rates were in Hokkaido, Otaru (74.9%) / Hakodate (74.2%) / Sapporo (73.8%) / Wakkanai (73.3%), joined by Chichijima Island (74.4%) in the Ogasawara Islands. The low ones, by contrast, clustered in Southern Kyushu: Yakushima Island (39.5%) / Nishimera (42.6%) / Aburatsu (45%). This is the season when the front that brings the rainy-season rain stretches from Honshu toward the southwest, and only Hokkaido, outside it, kept its values. Among major stations, Kagoshima was at 48.1%, and its share of 3 straight days without precipitation thinned to 17.7%.
Even in the south, Naha's numbers were different. Its monthly average was 59.5%, but its 3-day figure was 34.9%, above Tokyo (28.9%) / Nagoya (27.7%). This is because in places where the rainy season ends earlier than on Honshu, dry days lined up together. Temperatures spread from an average high of 31°C at Ishigakijima Island to 15.6°C at Nemuro. Whether you want to avoid heat or rain, June points destinations to the north. Days with a daily mean wind speed of 5 m/s or more were high on the southern sea side, at Cape Muroto (70.1%) / Naha (57.4%).
The record values in this commentary are as compiled in September 2026, and the normals are based on 1996–2025 (30 years).
Other months and calendars
Typhoon approach calendar (June is a month with a record of typhoon approaches)
When to travel calendar (holidays, long weekends, and comfort levels for 12 months at once)
Each station's page also has a 12-month calendar for that station.