Ōyama weather in May
In May, Ōyama sees average daytime highs of 20°C and overnight lows near 18°C, with 208 mm of rain across 11.6 wet days and about 13.8 hours of daylight. It is the 6th-warmest and 5th-wettest month of the year here.
Highs climb over the month, from about 19°C in the first days to 21°C by the end. The sky is clear or mostly clear about 29% of the time in May, and the air most often feels humid.
Daylight stretches from about 13 h 24 min at the start of May to 14 h 06 min by month's end. Set against the rest of the year, May is Ōyama's 10th-clearest and 9th-windiest month. For the whole year in context, see Ōyama's year-round climate.
- Daytime high
- 20°
- 6th warmest
- Overnight low
- 18°
- 7th coldest
- Rainfall
- 208 mm
- 11.6 wet days
- Daylight
- 13 h 48 min
- 4:49 AM – 6:37 PM
- Cloud cover
- 64%
- 10th clearest
- Wind
- 21 km/h
- 9th windiest
- Solar energy
- 5.59 kWh/m²
- Travel score
- 6.0
- out of 10
Temperature in May
Highs climb over the month, from about 19°C in the first days to 21°C by the end.
A typical May day in Ōyama reaches about 20°C in the afternoon and slips back to 18°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 21°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 |
| Avg low (°C) | 16 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 18 | 16 |
| 2 | 18 | 16 |
| 3 | 19 | 16 |
| 4 | 19 | 16 |
| 5 | 19 | 16 |
| 6 | 19 | 16 |
| 7 | 19 | 17 |
| 8 | 19 | 17 |
| 9 | 19 | 17 |
| 10 | 19 | 17 |
| 11 | 19 | 17 |
| 12 | 19 | 17 |
| 13 | 19 | 17 |
| 14 | 19 | 17 |
| 15 | 20 | 17 |
| 16 | 20 | 18 |
| 17 | 20 | 18 |
| 18 | 20 | 18 |
| 19 | 20 | 18 |
| 20 | 20 | 18 |
| 21 | 20 | 18 |
| 22 | 20 | 18 |
| 23 | 20 | 18 |
| 24 | 20 | 18 |
| 25 | 20 | 19 |
| 26 | 21 | 19 |
| 27 | 21 | 19 |
| 28 | 21 | 19 |
| 29 | 21 | 19 |
| 30 | 21 | 19 |
| 31 | 21 | 19 |
Ōyama weather by month
How May compares with the rest of the year at a glance. May is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 11° / 8° | 94 | 8.3 | 9.9 | 2.8 |
| Feb | 11° / 8° | 112 | 9.3 | 10.7 | 2.9 |
| Mar | 14° / 10° | 180 | 12.9 | 11.7 | 3.7 |
| Apr | 17° / 14° | 177 | 11.8 | 12.8 | 5.1 |
| May | 20° / 18° | 208 | 11.6 | 13.8 | 6.0 |
| Jun | 22° / 21° | 290 | 14.5 | 14.3 | 5.6 |
| Jul | 26° / 24° | 240 | 13.6 | 14.1 | 6.1 |
| Aug | 27° / 26° | 137 | 13.2 | 13.3 | 6.2 |
| Sep | 25° / 24° | 240 | 15.6 | 12.2 | 5.9 |
| Oct | 22° / 20° | 259 | 14.1 | 11.1 | 6.1 |
| Nov | 18° / 15° | 160 | 12.1 | 10.2 | 5.6 |
| Dec | 13° / 10° | 94 | 9.5 | 9.7 | 4.1 |
Cloud cover in May
The sky is clear or mostly clear about 29% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 59%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 48 | 47 | 46 | 46 | 45 | 44 | 43 | 43 | 42 | 42 | 41 | 40 | 40 | 40 | 39 | 39 | 39 | 40 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 40 | 39 | 38 | 38 | 37 | 35 |
| Cloudier (%) | 52 | 53 | 54 | 54 | 55 | 56 | 57 | 57 | 58 | 58 | 59 | 60 | 60 | 60 | 61 | 61 | 61 | 60 | 59 | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 61 | 62 | 62 | 63 | 65 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 48 | 52 |
| 2 | 47 | 53 |
| 3 | 46 | 54 |
| 4 | 46 | 54 |
| 5 | 45 | 55 |
| 6 | 44 | 56 |
| 7 | 43 | 57 |
| 8 | 43 | 57 |
| 9 | 42 | 58 |
| 10 | 42 | 58 |
| 11 | 41 | 59 |
| 12 | 40 | 60 |
| 13 | 40 | 60 |
| 14 | 40 | 60 |
| 15 | 39 | 61 |
| 16 | 39 | 61 |
| 17 | 39 | 61 |
| 18 | 40 | 60 |
| 19 | 41 | 59 |
| 20 | 41 | 59 |
| 21 | 41 | 59 |
| 22 | 41 | 59 |
| 23 | 40 | 60 |
| 24 | 40 | 60 |
| 25 | 40 | 60 |
| 26 | 40 | 60 |
| 27 | 39 | 61 |
| 28 | 38 | 62 |
| 29 | 38 | 62 |
| 30 | 37 | 63 |
| 31 | 35 | 65 |
Chance of precipitation in May
Ōyama gets around 208 mm of rain over 11.6 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 37% and peaks near 39% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 38 | 38 | 38 | 38 | 39 | 39 | 38 | 38 | 38 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 36 | 36 | 37 |
| Rain chance (%) | |
|---|---|
| 1 | 36 |
| 2 | 36 |
| 3 | 36 |
| 4 | 36 |
| 5 | 36 |
| 6 | 37 |
| 7 | 37 |
| 8 | 38 |
| 9 | 38 |
| 10 | 38 |
| 11 | 38 |
| 12 | 39 |
| 13 | 39 |
| 14 | 38 |
| 15 | 38 |
| 16 | 38 |
| 17 | 37 |
| 18 | 37 |
| 19 | 37 |
| 20 | 36 |
| 21 | 36 |
| 22 | 36 |
| 23 | 36 |
| 24 | 36 |
| 25 | 36 |
| 26 | 35 |
| 27 | 35 |
| 28 | 35 |
| 29 | 36 |
| 30 | 36 |
| 31 | 37 |
Humidity in May
Most of May feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the humid band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 47 | 45 | 43 | 41 | 38 | 36 | 34 | 32 | 30 | 28 | 26 | 25 | 23 | 21 | 20 | 18 | 17 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 | 5 | 4 |
| Comfortable (%) | 32 | 33 | 33 | 34 | 34 | 35 | 36 | 36 | 37 | 38 | 39 | 40 | 40 | 41 | 41 | 40 | 40 | 39 | 38 | 38 | 37 | 36 | 35 | 34 | 33 | 31 | 30 | 29 | 27 | 26 | 25 |
| Humid (%) | 20 | 21 | 22 | 23 | 25 | 26 | 27 | 28 | 29 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 47 | 48 | 48 | 48 |
| Muggy (%) | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 19 | 20 | 22 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 47 | 32 | 20 | 2 | 0 |
| 2 | 45 | 33 | 21 | 2 | 0 |
| 3 | 43 | 33 | 22 | 2 | 0 |
| 4 | 41 | 34 | 23 | 2 | 0 |
| 5 | 38 | 34 | 25 | 3 | 0 |
| 6 | 36 | 35 | 26 | 3 | 0 |
| 7 | 34 | 36 | 27 | 3 | 0 |
| 8 | 32 | 36 | 28 | 3 | 0 |
| 9 | 30 | 37 | 29 | 4 | 0 |
| 10 | 28 | 38 | 29 | 4 | 0 |
| 11 | 26 | 39 | 30 | 4 | 0 |
| 12 | 25 | 40 | 31 | 5 | 0 |
| 13 | 23 | 40 | 32 | 5 | 0 |
| 14 | 21 | 41 | 33 | 6 | 0 |
| 15 | 20 | 41 | 34 | 6 | 0 |
| 16 | 18 | 40 | 35 | 7 | 0 |
| 17 | 17 | 40 | 36 | 7 | 0 |
| 18 | 15 | 39 | 38 | 8 | 0 |
| 19 | 14 | 38 | 39 | 8 | 0 |
| 20 | 13 | 38 | 40 | 9 | 0 |
| 21 | 12 | 37 | 41 | 10 | 0 |
| 22 | 11 | 36 | 42 | 11 | 0 |
| 23 | 10 | 35 | 43 | 12 | 0 |
| 24 | 9 | 34 | 44 | 13 | 1 |
| 25 | 8 | 33 | 45 | 14 | 1 |
| 26 | 7 | 31 | 46 | 15 | 1 |
| 27 | 7 | 30 | 47 | 16 | 1 |
| 28 | 6 | 29 | 47 | 17 | 1 |
| 29 | 6 | 27 | 48 | 19 | 1 |
| 30 | 5 | 26 | 48 | 20 | 1 |
| 31 | 4 | 25 | 48 | 22 | 1 |
Wind in May
Winds average 21 km/h in May.
Across May, daily wind ranges from about 19 km/h on the calmest days to 23 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 23 | breezy |
| 2 | 23 | breezy |
| 3 | 23 | breezy |
| 4 | 22 | breezy |
| 5 | 22 | breezy |
| 6 | 22 | breezy |
| 7 | 22 | breezy |
| 8 | 22 | breezy |
| 9 | 22 | breezy |
| 10 | 22 | breezy |
| 11 | 22 | breezy |
| 12 | 22 | breezy |
| 13 | 21 | breezy |
| 14 | 21 | breezy |
| 15 | 21 | breezy |
| 16 | 21 | breezy |
| 17 | 21 | breezy |
| 18 | 21 | breezy |
| 19 | 21 | breezy |
| 20 | 20 | breezy |
| 21 | 20 | breezy |
| 22 | 20 | breezy |
| 23 | 20 | light breeze |
| 24 | 20 | light breeze |
| 25 | 20 | light breeze |
| 26 | 20 | light breeze |
| 27 | 20 | light breeze |
| 28 | 19 | light breeze |
| 29 | 19 | light breeze |
| 30 | 19 | light breeze |
| 31 | 19 | light breeze |
Sunrise & sunset in May
Daylight runs from about 13 h 24 min at the start of May to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 42 minutes over May. Sunrise moves from 5:03 AM to 4:41 AM, and sunset from 6:25 PM to 6:48 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.4 | 13.4 | 13.4 | 13.5 | 13.5 | 13.5 | 13.6 | 13.6 | 13.6 | 13.6 | 13.7 | 13.7 | 13.7 | 13.8 | 13.8 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 |
| Sunrise (AM) | 5:03 | 5:02 | 5:01 | 5:00 | 4:59 | 4:58 | 4:57 | 4:56 | 4:55 | 4:54 | 4:53 | 4:53 | 4:52 | 4:51 | 4:50 | 4:49 | 4:49 | 4:48 | 4:47 | 4:46 | 4:46 | 4:45 | 4:45 | 4:44 | 4:43 | 4:43 | 4:42 | 4:42 | 4:42 | 4:41 | 4:41 |
| Sunset (PM) | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:30 | 6:31 | 6:32 | 6:33 | 6:34 | 6:34 | 6:35 | 6:36 | 6:37 | 6:37 | 6:38 | 6:39 | 6:40 | 6:41 | 6:41 | 6:42 | 6:43 | 6:43 | 6:44 | 6:45 | 6:46 | 6:46 | 6:47 | 6:48 | 6:48 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.4 | 5:03 | 6:25 |
| 2 | 13.4 | 5:02 | 6:26 |
| 3 | 13.4 | 5:01 | 6:27 |
| 4 | 13.5 | 5:00 | 6:28 |
| 5 | 13.5 | 4:59 | 6:29 |
| 6 | 13.5 | 4:58 | 6:30 |
| 7 | 13.6 | 4:57 | 6:30 |
| 8 | 13.6 | 4:56 | 6:31 |
| 9 | 13.6 | 4:55 | 6:32 |
| 10 | 13.6 | 4:54 | 6:33 |
| 11 | 13.7 | 4:53 | 6:34 |
| 12 | 13.7 | 4:53 | 6:34 |
| 13 | 13.7 | 4:52 | 6:35 |
| 14 | 13.8 | 4:51 | 6:36 |
| 15 | 13.8 | 4:50 | 6:37 |
| 16 | 13.8 | 4:49 | 6:37 |
| 17 | 13.8 | 4:49 | 6:38 |
| 18 | 13.9 | 4:48 | 6:39 |
| 19 | 13.9 | 4:47 | 6:40 |
| 20 | 13.9 | 4:46 | 6:41 |
| 21 | 13.9 | 4:46 | 6:41 |
| 22 | 13.9 | 4:45 | 6:42 |
| 23 | 14.0 | 4:45 | 6:43 |
| 24 | 14.0 | 4:44 | 6:43 |
| 25 | 14.0 | 4:43 | 6:44 |
| 26 | 14.0 | 4:43 | 6:45 |
| 27 | 14.1 | 4:42 | 6:46 |
| 28 | 14.1 | 4:42 | 6:46 |
| 29 | 14.1 | 4:42 | 6:47 |
| 30 | 14.1 | 4:41 | 6:48 |
| 31 | 14.1 | 4:41 | 6:48 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.59 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 5.59 kWh/m² in May across the year — May's 5.59 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.6 | 5.6 | 5.6 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.5 | Bright |
| 2 | 5.5 | Bright |
| 3 | 5.5 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.5 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.5 | Bright |
| 9 | 5.5 | Bright |
| 10 | 5.5 | Bright |
| 11 | 5.5 | Bright |
| 12 | 5.5 | Bright |
| 13 | 5.5 | Bright |
| 14 | 5.6 | Bright |
| 15 | 5.6 | Bright |
| 16 | 5.6 | Bright |
| 17 | 5.6 | Bright |
| 18 | 5.6 | Bright |
| 19 | 5.6 | Bright |
| 20 | 5.7 | Bright |
| 21 | 5.7 | Bright |
| 22 | 5.7 | Bright |
| 23 | 5.7 | Bright |
| 24 | 5.7 | Bright |
| 25 | 5.7 | Bright |
| 26 | 5.7 | Bright |
| 27 | 5.7 | Bright |
| 28 | 5.7 | Bright |
| 29 | 5.6 | Bright |
| 30 | 5.6 | Bright |
| 31 | 5.6 | Bright |
Hazard calendar for Ōyama
In May, Ōyama sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Ōyama sits in the Pacific typhoon belt; the season peaks July–October.
Is May a good time to visit Ōyama?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Ōyama for sightseeing.
What to pack for Ōyama in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Ōyama sees daytime highs around 20°C and nights near 18°C. Worth packing: rain gear, sun protection and a windbreaker. About 12 days see rain.
Sea temperature near Ōyama in May
The nearest coast averages about 19°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 27°C and coldest in February near 16°C.
It's comfortable for a long swim from May 25 to Nov 29 — about 6.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 16 | 16 | 16 | 17 | 19 | 22 | 25 | 27 | 26 | 24 | 21 | 19 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 16 | Cool |
| Feb | 16 | Cool |
| Mar | 16 | Cool |
| Apr | 17 | Cool |
| May | 19 | Cool |
| Jun | 22 | Refreshing |
| Jul | 25 | Warm |
| Aug | 27 | Warm |
| Sep | 26 | Warm |
| Oct | 24 | Refreshing |
| Nov | 21 | Refreshing |
| Dec | 19 | Cool |
UV index in Ōyama in May
Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ōyama peaks around July 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 7 | 9 | 10 | 10 | 10 | 9 | 6 | 4 | 3 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Ōyama in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.
Air quality in Ōyama is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 14 | 19 | 21 | 19 | 16 | 12 | 11 | 10 | 11 | 10 | 9 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 14 | Moderate |
| Mar | 19 | Moderate |
| Apr | 21 | Moderate |
| May | 19 | Moderate |
| Jun | 16 | Moderate |
| Jul | 12 | Good |
| Aug | 11 | Good |
| Sep | 10 | Good |
| Oct | 11 | Good |
| Nov | 10 | Good |
| Dec | 9 | Good |
Where is Ōyama?
Ōyama sits at 34.6°N, 138.2°E, 50 m above sea level, in Japan. The nearest listed city is Omaezaki, 1.0 km away.
Topography around Ōyama
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ōyama.
Within 3 km, the terrain around Ōyama has only modest variations in elevation — a maximum elevation change of 51 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 154 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,311 m.
The land around Ōyama is covered by water (70%) within 3 km, water (80%) within 16 km, and water (55%) and trees (37%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ōyama (34.6036°, 138.2172°, elevation 50 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).