San Sebastián weather in May
In May, San Sebastián sees average daytime highs of 32°C and overnight lows near 24°C, with 351 mm of rain across 27 wet days and about 12.7 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 32°C in the first days to 31°C by the end. The sky is clear or mostly clear about 12% of the time in May, and the air most often feels oppressive.
Daylight stretches from about 12 h 30 min at the start of May to 12 h 48 min by month's end. Set against the rest of the year, May is San Sebastián's 7th-clearest and 7th-windiest month. For the whole year in context, see San Sebastián's year-round climate.
- Daytime high
- 32°
- 4th warmest
- Overnight low
- 24°
- 12th coldest
- Rainfall
- 351 mm
- 27 wet days
- Daylight
- 12 h 42 min
- 5:43 AM – 6:23 PM
- Cloud cover
- 72%
- 7th clearest
- Wind
- 4 km/h
- 7th windiest
- Solar energy
- 5.75 kWh/m²
- Travel score
- 2.6
- out of 10
Temperature in May
Highs ease over the month, from about 32°C in the first days to 31°C by the end.
A typical May day in San Sebastián reaches about 32°C in the afternoon and slips back to 24°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 33°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer 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) | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 24 |
| 2 | 33 | 24 |
| 3 | 32 | 24 |
| 4 | 32 | 24 |
| 5 | 32 | 24 |
| 6 | 32 | 24 |
| 7 | 32 | 24 |
| 8 | 32 | 24 |
| 9 | 32 | 24 |
| 10 | 32 | 24 |
| 11 | 32 | 24 |
| 12 | 32 | 24 |
| 13 | 32 | 24 |
| 14 | 32 | 24 |
| 15 | 32 | 24 |
| 16 | 32 | 24 |
| 17 | 32 | 24 |
| 18 | 31 | 24 |
| 19 | 31 | 24 |
| 20 | 31 | 24 |
| 21 | 31 | 24 |
| 22 | 31 | 23 |
| 23 | 31 | 23 |
| 24 | 31 | 23 |
| 25 | 31 | 23 |
| 26 | 31 | 23 |
| 27 | 31 | 23 |
| 28 | 31 | 23 |
| 29 | 31 | 23 |
| 30 | 31 | 23 |
| 31 | 31 | 23 |
How May really feels in San Sebastián
Once humidity and wind are folded in, May averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Sebastián weather by month
How May compares with the rest of the year at a glance. May is the 4th-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 | 31° / 21° | 18 | 4.9 | 11.2 | 5.3 |
| Feb | 32° / 22° | 15 | 3.8 | 11.5 | 4.8 |
| Mar | 33° / 23° | 36 | 8.5 | 11.9 | 4.0 |
| Apr | 33° / 23° | 94 | 14.4 | 12.3 | 3.2 |
| May | 32° / 24° | 351 | 27 | 12.7 | 2.6 |
| Jun | 30° / 23° | 374 | 28.4 | 12.8 | 2.6 |
| Jul | 31° / 23° | 287 | 27 | 12.8 | 2.8 |
| Aug | 30° / 23° | 361 | 28.6 | 12.5 | 2.7 |
| Sep | 30° / 23° | 456 | 29.2 | 12.1 | 2.6 |
| Oct | 30° / 23° | 384 | 27.7 | 11.7 | 3.0 |
| Nov | 30° / 23° | 116 | 15.5 | 11.3 | 4.4 |
| Dec | 31° / 22° | 27 | 6.1 | 11.2 | 5.4 |
Cloud cover in May
The sky is clear or mostly clear about 12% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 71%. 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 (%) | 51 | 50 | 49 | 48 | 46 | 45 | 43 | 41 | 40 | 38 | 36 | 34 | 32 | 30 | 29 | 27 | 25 | 24 | 23 | 22 | 20 | 19 | 18 | 18 | 16 | 15 | 15 | 14 | 12 | 12 | 12 |
| Cloudier (%) | 49 | 50 | 51 | 52 | 54 | 55 | 57 | 59 | 60 | 62 | 64 | 66 | 68 | 70 | 71 | 73 | 75 | 76 | 77 | 78 | 80 | 81 | 82 | 82 | 84 | 85 | 85 | 86 | 88 | 88 | 88 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 51 | 49 |
| 2 | 50 | 50 |
| 3 | 49 | 51 |
| 4 | 48 | 52 |
| 5 | 46 | 54 |
| 6 | 45 | 55 |
| 7 | 43 | 57 |
| 8 | 41 | 59 |
| 9 | 40 | 60 |
| 10 | 38 | 62 |
| 11 | 36 | 64 |
| 12 | 34 | 66 |
| 13 | 32 | 68 |
| 14 | 30 | 70 |
| 15 | 29 | 71 |
| 16 | 27 | 73 |
| 17 | 25 | 75 |
| 18 | 24 | 76 |
| 19 | 23 | 77 |
| 20 | 22 | 78 |
| 21 | 20 | 80 |
| 22 | 19 | 81 |
| 23 | 18 | 82 |
| 24 | 18 | 82 |
| 25 | 16 | 84 |
| 26 | 15 | 85 |
| 27 | 15 | 85 |
| 28 | 14 | 86 |
| 29 | 12 | 88 |
| 30 | 12 | 88 |
| 31 | 12 | 88 |
Chance of precipitation in May
San Sebastián gets around 351 mm of rain over 27 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 86% and peaks near 94% on the wettest days. The odds climb toward the end of the month.
| 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 (%) | 72 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 92 | 93 | 93 | 93 | 93 | 94 | 94 | 94 | 94 | 94 |
| Rain chance (%) | |
|---|---|
| 1 | 72 |
| 2 | 74 |
| 3 | 75 |
| 4 | 76 |
| 5 | 77 |
| 6 | 78 |
| 7 | 79 |
| 8 | 80 |
| 9 | 81 |
| 10 | 82 |
| 11 | 83 |
| 12 | 83 |
| 13 | 84 |
| 14 | 85 |
| 15 | 86 |
| 16 | 87 |
| 17 | 88 |
| 18 | 89 |
| 19 | 90 |
| 20 | 91 |
| 21 | 92 |
| 22 | 92 |
| 23 | 93 |
| 24 | 93 |
| 25 | 93 |
| 26 | 93 |
| 27 | 94 |
| 28 | 94 |
| 29 | 94 |
| 30 | 94 |
| 31 | 94 |
Humidity in May
Most of May feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the oppressive band about 84% of days. Sticky, muggy-or-worse air turns up on roughly 99% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | 12 | 11 | 10 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 |
| Oppressive (%) | 83 | 84 | 84 | 86 | 86 | 87 | 87 | 88 | 87 | 88 | 87 | 87 | 87 | 86 | 86 | 85 | 84 | 84 | 83 | 82 | 82 | 82 | 82 | 82 | 82 | 83 | 83 | 83 | 83 | 84 | 85 |
| Miserable (%) | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 11 | 11 | 12 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 1 | 12 | 83 | 4 |
| 2 | 1 | 11 | 84 | 4 |
| 3 | 1 | 10 | 84 | 5 |
| 4 | 1 | 8 | 86 | 5 |
| 5 | 1 | 7 | 86 | 6 |
| 6 | 1 | 6 | 87 | 6 |
| 7 | 0 | 6 | 87 | 7 |
| 8 | 0 | 5 | 88 | 7 |
| 9 | 0 | 5 | 87 | 8 |
| 10 | 0 | 4 | 88 | 8 |
| 11 | 0 | 4 | 87 | 9 |
| 12 | 0 | 4 | 87 | 9 |
| 13 | 0 | 3 | 87 | 10 |
| 14 | 0 | 3 | 86 | 11 |
| 15 | 0 | 3 | 86 | 11 |
| 16 | 0 | 3 | 85 | 12 |
| 17 | 0 | 3 | 84 | 13 |
| 18 | 0 | 3 | 84 | 13 |
| 19 | 0 | 3 | 83 | 14 |
| 20 | 0 | 4 | 82 | 14 |
| 21 | 0 | 4 | 82 | 14 |
| 22 | 0 | 4 | 82 | 14 |
| 23 | 0 | 4 | 82 | 14 |
| 24 | 0 | 4 | 82 | 14 |
| 25 | 0 | 4 | 82 | 14 |
| 26 | 0 | 3 | 83 | 14 |
| 27 | 0 | 3 | 83 | 14 |
| 28 | 0 | 3 | 83 | 14 |
| 29 | 0 | 3 | 83 | 14 |
| 30 | 0 | 3 | 84 | 13 |
| 31 | 0 | 2 | 85 | 13 |
Wind in May
Winds average 4 km/h in May.
Across May, daily wind ranges from about 4 km/h on the calmest days to 4 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) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
| 31 | 4 | calm |
Sunrise & sunset in May
Daylight runs from about 12 h 30 min at the start of May to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over May. Sunrise moves from 5:48 AM to 5:40 AM, and sunset from 6:19 PM to 6:28 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) | 12.5 | 12.5 | 12.5 | 12.5 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.6 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.7 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 |
| Sunrise (AM) | 5:48 | 5:48 | 5:47 | 5:47 | 5:47 | 5:46 | 5:46 | 5:45 | 5:45 | 5:45 | 5:44 | 5:44 | 5:44 | 5:43 | 5:43 | 5:43 | 5:42 | 5:42 | 5:42 | 5:42 | 5:41 | 5:41 | 5:41 | 5:41 | 5:41 | 5:41 | 5:41 | 5:40 | 5:40 | 5:40 | 5:40 |
| Sunset (PM) | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:21 | 6:21 | 6:22 | 6:22 | 6:22 | 6:22 | 6:23 | 6:23 | 6:23 | 6:24 | 6:24 | 6:24 | 6:25 | 6:25 | 6:25 | 6:25 | 6:26 | 6:26 | 6:26 | 6:27 | 6:27 | 6:27 | 6:28 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 5:48 | 6:19 |
| 2 | 12.5 | 5:48 | 6:19 |
| 3 | 12.5 | 5:47 | 6:20 |
| 4 | 12.5 | 5:47 | 6:20 |
| 5 | 12.6 | 5:47 | 6:20 |
| 6 | 12.6 | 5:46 | 6:20 |
| 7 | 12.6 | 5:46 | 6:21 |
| 8 | 12.6 | 5:45 | 6:21 |
| 9 | 12.6 | 5:45 | 6:21 |
| 10 | 12.6 | 5:45 | 6:21 |
| 11 | 12.6 | 5:44 | 6:22 |
| 12 | 12.6 | 5:44 | 6:22 |
| 13 | 12.6 | 5:44 | 6:22 |
| 14 | 12.7 | 5:43 | 6:22 |
| 15 | 12.7 | 5:43 | 6:23 |
| 16 | 12.7 | 5:43 | 6:23 |
| 17 | 12.7 | 5:42 | 6:23 |
| 18 | 12.7 | 5:42 | 6:24 |
| 19 | 12.7 | 5:42 | 6:24 |
| 20 | 12.7 | 5:42 | 6:24 |
| 21 | 12.7 | 5:41 | 6:25 |
| 22 | 12.7 | 5:41 | 6:25 |
| 23 | 12.7 | 5:41 | 6:25 |
| 24 | 12.7 | 5:41 | 6:25 |
| 25 | 12.8 | 5:41 | 6:26 |
| 26 | 12.8 | 5:41 | 6:26 |
| 27 | 12.8 | 5:41 | 6:26 |
| 28 | 12.8 | 5:40 | 6:27 |
| 29 | 12.8 | 5:40 | 6:27 |
| 30 | 12.8 | 5:40 | 6:27 |
| 31 | 12.8 | 5:40 | 6:28 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.75 kWh/m².
For context, solar energy here swings from a low near 4.61 kWh/m² to a high of 6.34 kWh/m² in April across the year — May's 5.75 kWh/m² falls in the middle.
| 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) | 6.2 | 6.2 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 | 6.1 | 6.0 | 6.0 | 6.0 | 5.9 | 5.9 | 5.9 | 5.8 | 5.8 | 5.7 | 5.7 | 5.7 | 5.6 | 5.6 | 5.5 | 5.5 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | 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 | 6.2 | Intense |
| 2 | 6.2 | Intense |
| 3 | 6.2 | Intense |
| 4 | 6.2 | Intense |
| 5 | 6.1 | Intense |
| 6 | 6.1 | Intense |
| 7 | 6.1 | Intense |
| 8 | 6.1 | Intense |
| 9 | 6.0 | Intense |
| 10 | 6.0 | Intense |
| 11 | 6.0 | Bright |
| 12 | 5.9 | Bright |
| 13 | 5.9 | Bright |
| 14 | 5.9 | Bright |
| 15 | 5.8 | Bright |
| 16 | 5.8 | Bright |
| 17 | 5.7 | Bright |
| 18 | 5.7 | Bright |
| 19 | 5.7 | Bright |
| 20 | 5.6 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.5 | Bright |
| 23 | 5.5 | Bright |
| 24 | 5.4 | Bright |
| 25 | 5.4 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.3 | Bright |
| 28 | 5.3 | Bright |
| 29 | 5.3 | Bright |
| 30 | 5.2 | Bright |
| 31 | 5.2 | Bright |
Hazard calendar for San Sebastián
In May, San Sebastián sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
San Sebastián sits in the Atlantic hurricane belt; the season peaks August–October.
San Sebastián's rainy season runs May–October, when most of the year's rain falls.
Is May a good time to visit San Sebastián?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a weaker month for outdoor sightseeing in San Sebastián.
What to pack for San Sebastián in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, San Sebastián sees daytime highs around 32°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.
Sea temperature near San Sebastián in May
The nearest coast averages about 30°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 49 km away) is warmest in July at about 30°C and coldest in February near 29°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 29 | 30 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 29 | Tropical |
| Nov | 30 | Tropical |
| Dec | 29 | Tropical |
UV index in San Sebastián in May
Clear-sky midday UV in May peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Sebastián peaks around March 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 8 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 9 | 11 | 12 | 12 | 11 | 12 | 11 | 11 | 11 | 10 | 8 | 8 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 8 | Very high |
Air quality in San Sebastián 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 San Sebastián is worst in December — around 45 µg/m³ PM2.5 (poor), about 1.6× the cleanest month (June, 28 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) | 44 | 45 | 41 | 44 | 40 | 28 | 29 | 29 | 29 | 30 | 37 | 45 |
| Level | Poor | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 44 | Poor |
| Feb | 45 | Poor |
| Mar | 41 | Poor |
| Apr | 44 | Poor |
| May | 40 | Poor |
| Jun | 28 | Moderate |
| Jul | 29 | Moderate |
| Aug | 29 | Moderate |
| Sep | 29 | Moderate |
| Oct | 30 | Moderate |
| Nov | 37 | Poor |
| Dec | 45 | Poor |
Where is San Sebastián?
San Sebastián sits at 14.6°N, 91.6°W, 313 m above sea level, in Guatemala. The nearest listed city is Retalhuleu, 4.0 km away.
Topography around San Sebastián
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Sebastián.
Within 3 km, the terrain around San Sebastián has only modest variations in elevation — a maximum elevation change of 150 m around an average of 314 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,200 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,178 m.
The land around San Sebastián is covered by trees (66%) and grassland (20%) within 3 km, trees (71%) within 16 km, and trees (53%) and water (20%) within 80 km.
Guatemala travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 43% of US
- price level, 2025
- GDP per capita
- $6,598
- 2025
- Happiness
- 6.5 / 10
- World Happiness, 2025
- Safe drinking water
- 49%
- of population, 2024
- Homicide rate
- 23.4
- per 100k, 2023
- Road deaths
- 22.9
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 510
- 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 San Sebastián (14.5618°, -91.6487°, elevation 313 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).