Today
Sun, Jun 21
Light drizzle
28°22°
- Rain chance
- 100%
- Precip
- 0.3 mm
- Max wind
- 11 km/h
Isahaya weather forecast
Nagasaki, Japan · Tokyo time · 32.84°, 130.04°
Heavy rain Wednesday: around 115 mm expected.
Heavy rain Wednesday: around 115 mm expected.
Derived advisory — not an official warning
Current conditions · 9:30 PM local
Current conditions in Isahaya
23°C
Partly cloudy
Feels like 28°C
- Humidity
- 95%
- Wind
- 6 km/h ENE
- Gusts
- 9 km/h
- UV index
- 0
- Visibility
- 11.8 km
Right now
Right now in Isahaya, it's partly cloudy with the temperature at 23 °C. It feels warmer than it reads, more like 26 °C. Wind is from the ENE at 6 km/h. Humidity stands at 77% with sea-level pressure near 1009 hPa.
At a glance
Today
28° / 22°Light drizzle · rain likely (100%)
Tomorrow
24° / 20°Moderate rain · rain likely (95%)
Upcoming · to Saturday
26° / 19°Highs 26°, lows 19°. The most active day looks like Wednesday, when rain chances peak at 100%.
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Next 3 days
Expect light drizzle today, between 22 °C and 28 °C. Rain chance peaks at 100% with around 0.3 mm possible. Tomorrow brings moderate rain with a high of 24 °C and a low of 20 °C. Rain chance peaks at 95% with around 10 mm possible. Tuesday brings moderate rain with a high of 21 °C and a low of 19 °C. Rain chance peaks at 98% with around 35.4 mm possible.
Tomorrow
Mon, Jun 22
Moderate rain
24°20°
- Rain chance
- 95%
- Precip
- 10 mm
- Max wind
- 10 km/h
Tuesday
Tue, Jun 23
Moderate rain
21°19°
- Rain chance
- 98%
- Precip
- 35.4 mm
- Max wind
- 12 km/h
Next 48 hours
- 12 AM24°100%8 km/h
- 1 AM23°81%9 km/h
- 2 AM23°54%9 km/h
- 3 AM22°31%7 km/h
- 4 AM23°17%7 km/h
- 5 AM23°7%7 km/h
- 6 AM23°0%7 km/h
- 7 AM23°0%8 km/h
- 8 AM24°0%9 km/h
- 9 AM25°0%9 km/h
- 10 AM26°0%9 km/h
- 11 AM27°0%10 km/h
- 12 PM27°0%11 km/h
- 1 PM27°6%11 km/h
- 2 PM28°14%10 km/h
- 3 PM28°22%6 km/h
- 4 PM27°29%7 km/h
- 5 PM26°35%6 km/h
- 6 PM25°37%9 km/h
- 7 PM24°31%8 km/h
- 8 PM24°20%5 km/h
- 9 PM24°12%4 km/h
- 10 PM23°9%7 km/h
- 11 PM23°8%8 km/h
- 12 AM23°8%7 km/h
- 1 AM23°8%4 km/h
- 2 AM22°8%5 km/h
- 3 AM22°8%4 km/h
- 4 AM22°8%6 km/h
- 5 AM22°9%6 km/h
- 6 AM22°10%7 km/h
- 7 AM22°11%7 km/h
- 8 AM23°12%8 km/h
- 9 AM24°14%9 km/h
- 10 AM24°16%8 km/h
- 11 AM24°20%8 km/h
- 12 PM24°24%5 km/h
- 1 PM23°30%1 km/h
- 2 PM23°37%3 km/h
- 3 PM23°45%7 km/h
- 4 PM23°53%4 km/h
- 5 PM22°61%6 km/h
- 6 PM21°69%7 km/h
- 7 PM21°77%8 km/h
- 8 PM21°84%10 km/h
- 9 PM21°90%8 km/h
- 10 PM20°94%7 km/h
- 11 PM20°95%9 km/h
In depth
Isahaya starts the period under partly cloudy, with the mercury at 23 °C and a feels-like of 26 °C. Today's forecast calls for light drizzle, topping out near 28 °C before falling back to 22 °C overnight. Winds blow mainly from the WNW around 11 km/h, with gusts up to 33 km/h. Highs ease downward through the week, ranging 21 to 28 °C. Rain is in the picture on tomorrow, Tuesday, Wednesday and beyond, with roughly 171 mm expected in total across the week. Tomorrow brings moderate rain with a high of 24 °C and a 95% chance of precipitation. The UV index reaches 8 today, so sun protection is sensible during the middle of the day. Sunrise comes at 05:11 and sunset at 19:30, giving 14.3 hours of daylight. Current humidity sits at 77% with pressure near 1009 hPa. Looking further out, Thursday shows thunderstorm with a high around 25 °C, while Saturday ends the week at 24 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Air quality
70
Moderate
US AQI · European AQI 38
Air quality in Isahaya is currently moderate, with a US AQI of 70 (European AQI 38). The dominant pollutant right now is ozone. Unusually sensitive people should consider easing prolonged outdoor exertion. Fine particulate matter (PM2.5) measures 7.6 µg/m³.
Pollutants
- PM2.5
- 7.6 µg/m³
- PM10
- 9.6 µg/m³
- Ozone (O₃)
- 96 µg/m³
- NO₂
- 5.3 µg/m³
- SO₂
- 2.7 µg/m³
- CO
- 146 µg/m³
- Dust
- 0 µg/m³
Sun & UV
- Sunrise
- 5:11 AM
- Sunset
- 7:30 PM
- Daylight
- 14h 19m
- Max UV
- 8.5 Very high
Wind
- Wind
- 6 km/h
- Gusts
- 9 km/h
- Direction
- ENE (58°)
Farming weather
Soil temperatures today read surface 21.9 °C, 6 cm 23.5 °C, 18 cm 24.4 °C, 54 cm 22 °C. Soil moisture sits at 0-1 cm at 0.34 m³/m³, 3-9 cm at 0.35 m³/m³, 27-81 cm at 0.41 m³/m³. For wheat, the root-zone reading is within the ideal 0.2-0.35 m³/m³ band. Forecast rain (171 mm) roughly covers crop water demand (ET0 18 mm), so irrigation can likely be paused. A suitable spraying window opens around 06:00 on 2026-06-21, with winds at or below 15 km/h and no rain expected. Projected growing degree days over the next week: wheat 125, maize 87.
- Topsoil moisture
- 0.38 m³/m³
- Soil temp
- 23°C
- ET₀ today
- 4.44 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 170.8 mm
- Wind
- 6 km/h
- Humidity
- 95%
Advisory summary
Weather alerts for Isahaya (derived from forecast data, not official warnings): Heavy rain Wednesday: around 115 mm expected.
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All data for Isahaya
| Variable | Value |
|---|---|
| City | Isahaya, Nagasaki, Japan |
| Coordinates | 32.84111, 130.04306 |
| Elevation | 104 m |
| Timezone | Asia/Tokyo |
| Population | 135,546 |
| Observed at (local) | 9:30 PM |
| Temperature (2 m) | 23°C |
| Apparent temperature | 28°C |
| Relative humidity (2 m) | 95% |
| Dew point (2 m) | 23°C |
| Precipitation (last hour) | 0 mm |
| Rain | 0 mm |
| Showers | 0 mm |
| Snowfall | 0 cm |
| Weather code (WMO) | 2 |
| Cloud cover | 64% |
| Surface pressure | 1000 hPa |
| Sea-level pressure | 1009 hPa |
| Wind speed (10 m) | 6 km/h |
| Wind gusts (10 m) | 9 km/h |
| Wind direction (10 m) | 58° (ENE) |
| Visibility | 11.8 km |
| UV index | 0 |
| Day / night | Night |
| Today max / min | 28°C / 22°C |
| Today feels-like max / min | 33°C / 25°C |
| Today precipitation sum | 0.3 mm |
| Today rain sum | 0.3 mm |
| Today snowfall sum | 0 cm |
| Today max precip probability | 100% |
| Today max wind / gusts | 11 km/h / 33 km/h |
| Dominant wind direction | 294° (WNW) |
| Sunrise / sunset | 5:11 AM / 7:30 PM |
| Daylight duration | 14h 19m |
| Sunshine duration | 9h 33m |
| Max UV index | 8.5 |
| Reference evapotranspiration (ET₀) | 4.44 mm |
| Topsoil moisture (0–1 cm) | 0.38 m³/m³ |
| Surface soil temperature | 23°C |
| US AQI | 70 |
| European AQI | 38 |
| PM2.5 | 7.6 µg/m³ |
| PM10 | 9.6 µg/m³ |
| Ozone (O₃) | 96 µg/m³ |
| Nitrogen dioxide (NO₂) | 5.3 µg/m³ |
| Sulphur dioxide (SO₂) | 2.7 µg/m³ |
| Carbon monoxide (CO) | 146 µg/m³ |
| Dust | 0 µg/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/jp/nagasaki/isahaya" width="320" height="180" frameborder="0" title="Isahaya weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in Isahaya tomorrow?
Rain is likely in Isahaya tomorrow — the chance of precipitation reaches 95%, with around 10 mm expected.
What is the temperature in Isahaya today?
Today Isahaya sees light drizzle with a high of 28 °C and a low of 22 °C.
How hot will it be in Isahaya tomorrow?
Tomorrow's high in Isahaya is forecast at 24 °C with moderate rain.
Is it windy in Isahaya today?
No, not especially; gusts only reach up to 33 km/h today.
What is the UV index in Isahaya today?
The UV index peaks at 8 today, which is very high.
What time is sunrise and sunset in Isahaya today?
The sun rises at 05:11 and sets at 19:30 local time.
Is the air quality in Isahaya good today?
Air quality is moderate right now, with a US AQI reading of 70.