Climate averages 1991–2020
Inzai weather
in May.
A warm, wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Inzai: daytime highs average 22.0°C and nights cool to about 14.0°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 128 mm of rain on roughly 12 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 02 min on an average May day.
The nearest other city in this atlas is Ryūgasaki (7 km away). In May its highs average 22.3°C, about as warm as Inzai, with 129 mm of rain.
Among the 303 cities listed in Japan, Inzai ranks joint 135th of 303 for the warmest May highs and joint 57th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Inzai is 0.7°C warmer than that mean.
From May to June, average highs rise by 2.8°C to 24.8°C, and monthly rainfall rises from 128 mm to 159 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Inzai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.2°C0.2°C | 0.2°C | 74 | 7.5 | 10.010 h |
| February | 9.2°C0.7°C | 0.7°C | 72 | 8.6 | 10.911 h |
| March | 12.6°C4.0°C | 4.0°C | 125 | 12.8 | 11.912 h |
| April | 17.5°C8.9°C | 8.9°C | 113 | 12.5 | 13.113 h |
| May, selected | 22.0°C14.0°C | 14.0°C | 128 | 11.6 | 14.014 h |
| June | 24.8°C17.9°C | 17.9°C | 159 | 13.7 | 14.515 h |
| July | 28.6°C21.9°C | 21.9°C | 150 | 13.8 | 14.314 h |
| August | 30.0°C23.3°C | 23.3°C | 114 | 11.9 | 13.514 h |
| September | 26.2°C20.2°C | 20.2°C | 175 | 14.3 | 12.412 h |
| October | 20.8°C14.6°C | 14.6°C | 207 | 13.0 | 11.311 h |
| November | 15.7°C8.7°C | 8.7°C | 102 | 10.4 | 10.310 h |
| December | 10.6°C3.0°C | 3.0°C | 68 | 8.4 | 9.810 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Ryūgasaki in MayJapan · 7 kmHigh 22.3°C · Low 13.7°C · 129 mm rain
- Toride in MayJapan · 10 kmHigh 22.3°C · Low 13.8°C · 131 mm rain
- Yachiyo in MayJapan · 12 kmHigh 21.6°C · Low 14.3°C · 131 mm rain
- Sakura in MayJapan · 15 kmHigh 21.8°C · Low 14.4°C · 128 mm rain
- Ushiku in MayJapan · 15 kmHigh 22.2°C · Low 13.5°C · 129 mm rain
- Narita in MayJapan · 15 kmHigh 22.1°C · Low 14.0°C · 128 mm rain
- Kamagaya in MayJapan · 16 kmHigh 21.9°C · Low 13.9°C · 131 mm rain
- Kashiwa in MayJapan · 17 kmHigh 22.1°C · Low 13.6°C · 131 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Inzai) is explained once on the Inzai year overview and on the Sources, method and limits page.
Sakura and Narita lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.