Climate averages 1991–2020
Osaka 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 Osaka: daytime highs average 23.0°C and nights cool to about 14.1°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 139 mm of rain on roughly 11 days, which makes May a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 57 min on an average May day.
The nearest other city in this atlas is Higashiosaka (8 km away). In May its highs average 23.2°C, about as warm as Osaka, with 139 mm of rain.
Among the 303 cities listed in Japan, Osaka ranks joint 27th of 303 for the warmest May highs and joint 132nd of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Osaka is 1.7°C warmer than that mean.
From May to June, average highs rise by 3.2°C to 26.2°C, and monthly rainfall rises from 139 mm to 189 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
Osaka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.2°C1.1°C | 1.1°C | 57 | 5.9 | 10.110 h |
| February | 9.2°C1.1°C | 1.1°C | 65 | 7.4 | 10.911 h |
| March | 12.8°C3.8°C | 3.8°C | 110 | 10.7 | 11.912 h |
| April | 18.2°C8.8°C | 8.8°C | 118 | 10.4 | 13.013 h |
| May, selected | 23.0°C14.1°C | 14.1°C | 139 | 10.6 | 14.014 h |
| June | 26.2°C18.8°C | 18.8°C | 189 | 13.0 | 14.414 h |
| July | 29.7°C23.1°C | 23.1°C | 183 | 14.6 | 14.214 h |
| August | 31.5°C24.3°C | 24.3°C | 110 | 11.6 | 13.513 h |
| September | 27.6°C20.4°C | 20.4°C | 163 | 11.9 | 12.412 h |
| October | 21.7°C14.3°C | 14.3°C | 151 | 9.5 | 11.311 h |
| November | 16.1°C8.5°C | 8.5°C | 81 | 7.2 | 10.410 h |
| December | 10.6°C3.4°C | 3.4°C | 62 | 6.8 | 9.910 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
- Higashiosaka in MayJapan · 8 kmHigh 23.2°C · Low 13.9°C · 139 mm rain
- Toyonaka in MayJapan · 10 kmHigh 22.9°C · Low 13.8°C · 139 mm rain
- Yao in MayJapan · 12 kmHigh 22.9°C · Low 13.5°C · 132 mm rain
- Sakai in MayJapan · 13 kmHigh 22.8°C · Low 13.8°C · 132 mm rain
- Nishinomiya in MayJapan · 16 kmHigh 23.0°C · Low 14.5°C · 150 mm rain
- Takarazuka in MayJapan · 18 kmHigh 23.0°C · Low 14.2°C · 150 mm rain
- Ikoma in MayJapan · 18 kmHigh 22.2°C · Low 12.6°C · 129 mm rain
- Hirakata in MayJapan · 19 kmHigh 23.0°C · Low 13.6°C · 129 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 Osaka) is explained once on the Osaka year overview and on the Sources, method and limits page.
Higashiosaka and Toyonaka lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.