Today
Sun, Jun 21
Moderate rain
27°20°
- Rain chance
- 100%
- Precip
- 14.2 mm
- Max wind
- 7 km/h
Iruma weather forecast
Saitama, Japan · Tokyo time · 35.82°, 139.37°
Heavy rain Thursday: around 50 mm expected.
Heavy rain Thursday: around 50 mm expected.
Derived advisory — not an official warning
Current conditions · 8:30 PM local
Current conditions in Iruma
24°C
Partly cloudy
Feels like 23°C
- Humidity
- 98%
- Wind
- 7 km/h N
- Gusts
- 28 km/h
- UV index
- 0
- Visibility
- 2.7 km
Right now
Iruma is currently seeing partly cloudy, with 24 °C on the thermometer. It feels warmer than it reads, more like 27 °C. Wind is from the N at 7 km/h, gusting to 28 km/h. Humidity stands at 75% with sea-level pressure near 1000 hPa.
At a glance
Today
27° / 20°Moderate rain · rain likely (100%)
Tomorrow
29° / 19°Overcast · rain likely (94%)
Upcoming · to Saturday
27° / 16°Highs 27°, lows 16°. The most active day looks like Friday, when rain chances peak at 89%.
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Next 3 days
Today looks like moderate rain; temperatures run from 20 °C up to 27 °C. Rain chance peaks at 100% with around 14.2 mm possible. Tomorrow brings overcast with a high of 29 °C and a low of 19 °C. Rain chance peaks at 94%. Tuesday brings moderate drizzle with a high of 25 °C and a low of 17 °C. Rain chance peaks at 49% with around 1.9 mm possible.
Tomorrow
Mon, Jun 22
Overcast
29°19°
- Rain chance
- 94%
- Precip
- 0 mm
- Max wind
- 10 km/h
Tuesday
Tue, Jun 23
Moderate drizzle
25°17°
- Rain chance
- 49%
- Precip
- 1.9 mm
- Max wind
- 8 km/h
Next 48 hours
- 12 AM20°100%2 km/h
- 1 AM20°97%3 km/h
- 2 AM20°94%2 km/h
- 3 AM20°92%3 km/h
- 4 AM20°97%4 km/h
- 5 AM20°100%4 km/h
- 6 AM20°100%6 km/h
- 7 AM20°75%7 km/h
- 8 AM21°38%6 km/h
- 9 AM21°12%7 km/h
- 10 AM22°6%7 km/h
- 11 AM24°9%6 km/h
- 12 PM25°12%7 km/h
- 1 PM25°11%6 km/h
- 2 PM26°10%5 km/h
- 3 PM27°10%5 km/h
- 4 PM27°12%5 km/h
- 5 PM27°16%4 km/h
- 6 PM26°22%2 km/h
- 7 PM25°35%3 km/h
- 8 PM25°51%6 km/h
- 9 PM24°59%7 km/h
- 10 PM23°54%6 km/h
- 11 PM23°41%6 km/h
- 12 AM22°29%5 km/h
- 1 AM21°18%5 km/h
- 2 AM21°7%4 km/h
- 3 AM20°0%3 km/h
- 4 AM20°0%2 km/h
- 5 AM19°0%3 km/h
- 6 AM20°0%2 km/h
- 7 AM21°0%3 km/h
- 8 AM22°0%4 km/h
- 9 AM24°0%5 km/h
- 10 AM26°1%6 km/h
- 11 AM27°2%6 km/h
- 12 PM28°4%5 km/h
- 1 PM29°5%4 km/h
- 2 PM29°7%2 km/h
- 3 PM29°14%8 km/h
- 4 PM28°31%10 km/h
- 5 PM26°54%8 km/h
- 6 PM25°73%9 km/h
- 7 PM24°85%8 km/h
- 8 PM23°93%7 km/h
- 9 PM22°94%7 km/h
- 10 PM22°83%5 km/h
- 11 PM21°65%5 km/h
In depth
Across Iruma right now you'll find partly cloudy and a temperature of 24 °C, with the apparent temperature at 27 °C. Today's forecast calls for moderate rain, topping out near 27 °C before falling back to 20 °C overnight. Winds blow mainly from the NNE around 7 km/h, with gusts up to 35 km/h. Daytime highs hold fairly steady this week, staying within 21 to 29 °C. Rain is in the picture on today, Tuesday, Thursday and beyond, with roughly 92 mm expected in total across the week. Tomorrow brings overcast with a high of 29 °C and a 94% chance of precipitation. The UV index reaches 7 today, so sun protection is sensible during the middle of the day. Sunrise comes at 04:26 and sunset at 19:01, giving 14.6 hours of daylight. Current humidity sits at 75% with pressure near 1000 hPa. Looking further out, Thursday shows thunderstorm with a high around 21 °C, while Saturday ends the week at 27 °C. Forecast details are refreshed throughout the day as new model runs arrive, so check back for the latest figures.
Air quality
37
Good
US AQI · European AQI 30
Air quality in Iruma is currently good, with a US AQI of 37 (European AQI 30). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 11.4 µg/m³.
Pollutants
- PM2.5
- 11.4 µg/m³
- PM10
- 11.5 µg/m³
- Ozone (O₃)
- 76 µg/m³
- NO₂
- 11 µg/m³
- SO₂
- 6.1 µg/m³
- CO
- 124 µg/m³
- Dust
- 0 µg/m³
Sun & UV
- Sunrise
- 4:26 AM
- Sunset
- 7:01 PM
- Daylight
- 14h 35m
- Max UV
- 6.85 High
Wind
- Wind
- 7 km/h
- Gusts
- 28 km/h
- Direction
- N (9°)
Farming weather
Soil temperatures today read surface 20.3 °C, 6 cm 21.6 °C, 18 cm 22.2 °C, 54 cm 20.9 °C. Soil moisture sits at 0-1 cm at 0.3 m³/m³, 3-9 cm at 0.31 m³/m³, 27-81 cm at 0.32 m³/m³. For wheat, the root-zone reading is within the ideal 0.2-0.35 m³/m³ band. Forecast rain (92 mm) roughly covers crop water demand (ET0 22 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 124, maize 86.
- Topsoil moisture
- 0.334 m³/m³
- Soil temp
- 20°C
- ET₀ today
- 2.87 mm
- Spray window
- ~5:00
- Rain (next 7d)
- 91.7 mm
- Wind
- 7 km/h
- Humidity
- 98%
Advisory summary
Weather alerts for Iruma (derived from forecast data, not official warnings): Heavy rain Thursday: around 50 mm expected.
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All data for Iruma
| Variable | Value |
|---|---|
| City | Iruma, Saitama, Japan |
| Coordinates | 35.818, 139.368 |
| Elevation | 126 m |
| Timezone | Asia/Tokyo |
| Population | 147,166 |
| Observed at (local) | 8:30 PM |
| Temperature (2 m) | 24°C |
| Apparent temperature | 23°C |
| Relative humidity (2 m) | 98% |
| Dew point (2 m) | 20°C |
| Precipitation (last hour) | 0 mm |
| Rain | 0 mm |
| Showers | 0 mm |
| Snowfall | 0 cm |
| Weather code (WMO) | 2 |
| Cloud cover | 79% |
| Surface pressure | 985 hPa |
| Sea-level pressure | 1000 hPa |
| Wind speed (10 m) | 7 km/h |
| Wind gusts (10 m) | 28 km/h |
| Wind direction (10 m) | 9° (N) |
| Visibility | 2.7 km |
| UV index | 0 |
| Day / night | Night |
| Today max / min | 27°C / 20°C |
| Today feels-like max / min | 30°C / 23°C |
| Today precipitation sum | 14.2 mm |
| Today rain sum | 14.2 mm |
| Today snowfall sum | 0 cm |
| Today max precip probability | 100% |
| Today max wind / gusts | 7 km/h / 35 km/h |
| Dominant wind direction | 14° (NNE) |
| Sunrise / sunset | 4:26 AM / 7:01 PM |
| Daylight duration | 14h 35m |
| Sunshine duration | 4h 52m |
| Max UV index | 6.85 |
| Reference evapotranspiration (ET₀) | 2.87 mm |
| Topsoil moisture (0–1 cm) | 0.334 m³/m³ |
| Surface soil temperature | 20°C |
| US AQI | 37 |
| European AQI | 30 |
| PM2.5 | 11.4 µg/m³ |
| PM10 | 11.5 µg/m³ |
| Ozone (O₃) | 76 µg/m³ |
| Nitrogen dioxide (NO₂) | 11 µg/m³ |
| Sulphur dioxide (SO₂) | 6.1 µg/m³ |
| Carbon monoxide (CO) | 124 µg/m³ |
| Dust | 0 µg/m³ |
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<iframe src="https://weathertomorrow.cloud/embed/city/jp/saitama/iruma" width="320" height="180" frameborder="0" title="Iruma weather" loading="lazy"></iframe>Frequently asked questions
Will it rain in Iruma tomorrow?
Rain is likely in Iruma tomorrow — the chance of precipitation reaches 94%, with around 0 mm expected.
What is the temperature in Iruma today?
Today Iruma sees moderate rain with a high of 27 °C and a low of 20 °C.
How hot will it be in Iruma tomorrow?
Tomorrow's high in Iruma is forecast at 29 °C with overcast.
Is it windy in Iruma today?
No, not especially; gusts only reach up to 35 km/h today.
What is the UV index in Iruma today?
The UV index peaks at 7 today, which is high.
What time is sunrise and sunset in Iruma today?
The sun rises at 04:26 and sets at 19:01 local time.
Is the air quality in Iruma good today?
Air quality is good right now, with a US AQI reading of 37.