San Martín weather in December
In December, San Martín sees average daytime highs of 32°C and overnight lows near 20°C, with 8 mm of rain across 1.7 wet days and about 11.2 hours of daylight. It is the 6th-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 73% of the time in December, and the air most often feels humid.
Daylight stretches from about 11 h 12 min at the start of December to 11 h 12 min by month's end. Set against the rest of the year, December is San Martín's 3rd-clearest and 2nd-windiest month. For the whole year in context, see San Martín's year-round climate.
- Daytime high
- 32°
- 6th warmest
- Overnight low
- 20°
- 2nd coldest
- Rainfall
- 8 mm
- 1.7 wet days
- Daylight
- 11 h 12 min
- 6:16 AM – 5:28 PM
- Cloud cover
- 29%
- 3rd clearest
- Wind
- 7 km/h
- 2nd windiest
- Solar energy
- 5.24 kWh/m²
- Travel score
- 5.4
- out of 10
San Martín is settlement in Cuscatlan, El Salvador.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in December
Day-to-day highs hold fairly steady near 32°C through the month.
A typical December day in San Martín reaches about 32°C in the afternoon and slips back to 20°C overnight — a 12°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, December runs about 1°C warmer than November and on par with January.
| 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) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| Avg low (°C) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 31 | 20 |
| 2 | 31 | 20 |
| 3 | 31 | 20 |
| 4 | 31 | 20 |
| 5 | 31 | 20 |
| 6 | 31 | 20 |
| 7 | 31 | 20 |
| 8 | 31 | 20 |
| 9 | 31 | 20 |
| 10 | 31 | 20 |
| 11 | 32 | 20 |
| 12 | 32 | 20 |
| 13 | 32 | 20 |
| 14 | 32 | 20 |
| 15 | 32 | 20 |
| 16 | 32 | 20 |
| 17 | 32 | 20 |
| 18 | 32 | 20 |
| 19 | 32 | 20 |
| 20 | 32 | 20 |
| 21 | 32 | 20 |
| 22 | 32 | 20 |
| 23 | 32 | 20 |
| 24 | 32 | 20 |
| 25 | 32 | 20 |
| 26 | 32 | 20 |
| 27 | 32 | 20 |
| 28 | 32 | 20 |
| 29 | 32 | 20 |
| 30 | 32 | 20 |
| 31 | 32 | 20 |
How December really feels in San Martín
Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
San Martín weather by month
How December compares with the rest of the year at a glance. December is the 6th-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 32° / 20° | 3 | 0.7 | 11.3 | 5.1 |
| Feb | 33° / 20° | 3 | 0.9 | 11.5 | 4.5 |
| Mar | 34° / 21° | 13 | 4 | 11.9 | 3.9 |
| Apr | 33° / 22° | 56 | 12.2 | 12.3 | 3.3 |
| May | 32° / 22° | 239 | 25.3 | 12.6 | 2.7 |
| Jun | 31° / 22° | 260 | 25.5 | 12.8 | 2.8 |
| Jul | 32° / 22° | 173 | 20.4 | 12.7 | 3.1 |
| Aug | 31° / 22° | 223 | 24.2 | 12.5 | 2.9 |
| Sep | 30° / 22° | 294 | 27.6 | 12.1 | 2.8 |
| Oct | 30° / 21° | 235 | 23.7 | 11.7 | 3.4 |
| Nov | 31° / 20° | 49 | 8.8 | 11.4 | 4.9 |
| Dec | 32° / 20° | 8 | 1.7 | 11.2 | 5.4 |
Cloud cover in December
The sky is clear or mostly clear about 73% of the time in December.
Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 13%. Skies tend to open up 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 (%) | 78 | 79 | 80 | 81 | 83 | 84 | 85 | 86 | 87 | 87 | 87 | 87 | 87 | 88 | 88 | 88 | 89 | 89 | 89 | 89 | 90 | 90 | 90 | 91 | 90 | 90 | 90 | 90 | 90 | 90 | 89 |
| Cloudier (%) | 22 | 21 | 20 | 19 | 17 | 16 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 11 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 78 | 22 |
| 2 | 79 | 21 |
| 3 | 80 | 20 |
| 4 | 81 | 19 |
| 5 | 83 | 17 |
| 6 | 84 | 16 |
| 7 | 85 | 15 |
| 8 | 86 | 14 |
| 9 | 87 | 13 |
| 10 | 87 | 13 |
| 11 | 87 | 13 |
| 12 | 87 | 13 |
| 13 | 87 | 13 |
| 14 | 88 | 12 |
| 15 | 88 | 12 |
| 16 | 88 | 12 |
| 17 | 89 | 11 |
| 18 | 89 | 11 |
| 19 | 89 | 11 |
| 20 | 89 | 11 |
| 21 | 90 | 10 |
| 22 | 90 | 10 |
| 23 | 90 | 10 |
| 24 | 91 | 9 |
| 25 | 90 | 10 |
| 26 | 90 | 10 |
| 27 | 90 | 10 |
| 28 | 90 | 10 |
| 29 | 90 | 10 |
| 30 | 90 | 10 |
| 31 | 89 | 11 |
Chance of precipitation in December
San Martín gets around 8 mm of rain over 1.7 wet days in December. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 6% and peaks near 12% on the wettest days. The odds ease 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 (%) | 12 | 11 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 |
| Rain chance (%) | |
|---|---|
| 1 | 12 |
| 2 | 11 |
| 3 | 10 |
| 4 | 9 |
| 5 | 8 |
| 6 | 8 |
| 7 | 7 |
| 8 | 7 |
| 9 | 6 |
| 10 | 6 |
| 11 | 6 |
| 12 | 6 |
| 13 | 6 |
| 14 | 5 |
| 15 | 5 |
| 16 | 5 |
| 17 | 5 |
| 18 | 5 |
| 19 | 5 |
| 20 | 5 |
| 21 | 5 |
| 22 | 5 |
| 23 | 5 |
| 24 | 5 |
| 25 | 5 |
| 26 | 4 |
| 27 | 4 |
| 28 | 4 |
| 29 | 4 |
| 30 | 4 |
| 31 | 4 |
Humidity in December
Most of December feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, December lands in the humid band about 52% of days. Sticky, muggy-or-worse air turns up on roughly 24% 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 (%) | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 5 |
| Comfortable (%) | 13 | 13 | 13 | 14 | 14 | 14 | 15 | 15 | 16 | 16 | 17 | 18 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Humid (%) | 46 | 47 | 49 | 50 | 51 | 51 | 51 | 52 | 51 | 52 | 52 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 53 | 53 | 53 | 53 | 54 | 54 | 53 | 54 | 54 | 55 | 54 | 55 | 55 |
| Muggy (%) | 35 | 34 | 33 | 32 | 31 | 30 | 29 | 28 | 28 | 27 | 27 | 26 | 26 | 25 | 24 | 23 | 23 | 22 | 20 | 19 | 18 | 17 | 16 | 15 | 15 | 14 | 14 | 13 | 13 | 12 | 12 |
| Oppressive (%) | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 2 | 13 | 46 | 35 | 3 |
| 2 | 2 | 13 | 47 | 34 | 3 |
| 3 | 2 | 13 | 49 | 33 | 3 |
| 4 | 2 | 14 | 50 | 32 | 3 |
| 5 | 2 | 14 | 51 | 31 | 2 |
| 6 | 3 | 14 | 51 | 30 | 2 |
| 7 | 3 | 15 | 51 | 29 | 2 |
| 8 | 3 | 15 | 52 | 28 | 2 |
| 9 | 3 | 16 | 51 | 28 | 2 |
| 10 | 3 | 16 | 52 | 27 | 2 |
| 11 | 3 | 17 | 52 | 27 | 1 |
| 12 | 3 | 18 | 52 | 26 | 1 |
| 13 | 3 | 18 | 52 | 26 | 1 |
| 14 | 3 | 19 | 52 | 25 | 1 |
| 15 | 3 | 20 | 52 | 24 | 1 |
| 16 | 3 | 21 | 52 | 23 | 1 |
| 17 | 3 | 22 | 51 | 23 | 1 |
| 18 | 3 | 23 | 51 | 22 | 1 |
| 19 | 3 | 24 | 53 | 20 | 0 |
| 20 | 3 | 25 | 53 | 19 | 0 |
| 21 | 3 | 26 | 53 | 18 | 0 |
| 22 | 3 | 27 | 53 | 17 | 0 |
| 23 | 3 | 27 | 54 | 16 | 0 |
| 24 | 3 | 28 | 54 | 15 | 0 |
| 25 | 4 | 28 | 53 | 15 | 0 |
| 26 | 4 | 28 | 54 | 14 | 0 |
| 27 | 4 | 28 | 54 | 14 | 0 |
| 28 | 4 | 28 | 55 | 13 | 0 |
| 29 | 5 | 28 | 54 | 13 | 0 |
| 30 | 5 | 28 | 55 | 12 | 0 |
| 31 | 5 | 28 | 55 | 12 | 0 |
Wind in December
Winds average 7 km/h in December.
Across December, daily wind ranges from about 7 km/h on the calmest days to 7 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
| 31 | 7 | calm |
Sunrise & sunset in December
Daylight runs from about 11 h 12 min at the start of December to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over December. Sunrise moves from 6:08 AM to 6:23 AM, and sunset from 5:23 PM to 5:35 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) | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 | 11.2 |
| Sunrise (AM) | 6:08 | 6:09 | 6:09 | 6:10 | 6:10 | 6:11 | 6:11 | 6:12 | 6:12 | 6:13 | 6:13 | 6:14 | 6:15 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:23 | 6:23 |
| Sunset (PM) | 5:23 | 5:23 | 5:23 | 5:23 | 5:24 | 5:24 | 5:24 | 5:25 | 5:25 | 5:25 | 5:26 | 5:26 | 5:26 | 5:27 | 5:27 | 5:28 | 5:28 | 5:28 | 5:29 | 5:29 | 5:30 | 5:30 | 5:31 | 5:31 | 5:32 | 5:32 | 5:33 | 5:33 | 5:34 | 5:34 | 5:35 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.2 | 6:08 | 5:23 |
| 2 | 11.2 | 6:09 | 5:23 |
| 3 | 11.2 | 6:09 | 5:23 |
| 4 | 11.2 | 6:10 | 5:23 |
| 5 | 11.2 | 6:10 | 5:24 |
| 6 | 11.2 | 6:11 | 5:24 |
| 7 | 11.2 | 6:11 | 5:24 |
| 8 | 11.2 | 6:12 | 5:25 |
| 9 | 11.2 | 6:12 | 5:25 |
| 10 | 11.2 | 6:13 | 5:25 |
| 11 | 11.2 | 6:13 | 5:26 |
| 12 | 11.2 | 6:14 | 5:26 |
| 13 | 11.2 | 6:15 | 5:26 |
| 14 | 11.2 | 6:15 | 5:27 |
| 15 | 11.2 | 6:16 | 5:27 |
| 16 | 11.2 | 6:16 | 5:28 |
| 17 | 11.2 | 6:17 | 5:28 |
| 18 | 11.2 | 6:17 | 5:28 |
| 19 | 11.2 | 6:18 | 5:29 |
| 20 | 11.2 | 6:18 | 5:29 |
| 21 | 11.2 | 6:19 | 5:30 |
| 22 | 11.2 | 6:19 | 5:30 |
| 23 | 11.2 | 6:20 | 5:31 |
| 24 | 11.2 | 6:20 | 5:31 |
| 25 | 11.2 | 6:20 | 5:32 |
| 26 | 11.2 | 6:21 | 5:32 |
| 27 | 11.2 | 6:21 | 5:33 |
| 28 | 11.2 | 6:22 | 5:33 |
| 29 | 11.2 | 6:22 | 5:34 |
| 30 | 11.2 | 6:23 | 5:34 |
| 31 | 11.2 | 6:23 | 5:35 |
Solar energy in December
Average shortwave solar energy reaching the ground each day in December, about 5.24 kWh/m².
For context, solar energy here swings from a low near 4.79 kWh/m² to a high of 6.28 kWh/m² in March across the year — December's 5.24 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) | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 |
| 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 | 5.2 | Bright |
| 2 | 5.2 | Bright |
| 3 | 5.2 | Bright |
| 4 | 5.2 | Bright |
| 5 | 5.2 | Bright |
| 6 | 5.2 | Bright |
| 7 | 5.2 | Bright |
| 8 | 5.2 | Bright |
| 9 | 5.2 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.2 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.2 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.2 | Bright |
| 20 | 5.2 | Bright |
| 21 | 5.2 | Bright |
| 22 | 5.2 | Bright |
| 23 | 5.2 | Bright |
| 24 | 5.3 | Bright |
| 25 | 5.3 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.3 | Bright |
| 28 | 5.3 | Bright |
| 29 | 5.3 | Bright |
| 30 | 5.3 | Bright |
| 31 | 5.3 | Bright |
Hazard calendar for San Martín
None of San Martín's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
San Martín sits in the Atlantic hurricane belt; the season peaks August–October.
San Martín's monsoon runs May–October, when most of the year's rain falls.
Is December a good time to visit San Martín?
Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
December is a reasonable time to visit San Martín for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Martín in December
From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In December, San Martín sees daytime highs around 32°C and nights near 20°C. Pack light clothes. Worth having: sun protection.
Sea temperature near San Martín in December
The nearest coast averages about 29°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 51 km away) is warmest in August at about 30°C and coldest in January near 28°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) | 28 | 28 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 28 | 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 | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in San Martín in December
Clear-sky midday UV in December 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 San Martín peaks around April 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 9 (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) | 10 | 13 | 13 | 13 | 12 | 13 | 12 | 12 | 12 | 11 | 9 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 13 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 13 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in San Martín in December
Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.
Air quality in San Martín is worst in April — around 43 µg/m³ PM2.5 (poor), about 1.6× the cleanest month (September, 26 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) | 34 | 35 | 35 | 43 | 40 | 27 | 30 | 27 | 26 | 29 | 35 | 36 |
| Level | Moderate | Moderate | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 34 | Moderate |
| Feb | 35 | Moderate |
| Mar | 35 | Poor |
| Apr | 43 | Poor |
| May | 40 | Poor |
| Jun | 27 | Moderate |
| Jul | 30 | Moderate |
| Aug | 27 | Moderate |
| Sep | 26 | Moderate |
| Oct | 29 | Moderate |
| Nov | 35 | Moderate |
| Dec | 36 | Poor |
Where is San Martín?
San Martín sits at 13.8°N, 88.9°W, 622 m above sea level, in El Salvador. The nearest listed city is Cojutepeque, 7.0 km away.
Topography around San Martín
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Martín.
Within 3 km, the terrain around San Martín has significant variations in elevation — a maximum elevation change of 399 m around an average of 638 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 826 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,703 m.
The land around San Martín is covered by trees (64%) and grassland (32%) within 3 km, trees (61%) and grassland (31%) within 16 km, and trees (54%) and grassland (23%) within 80 km.
El Salvador travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 115 V · 60 Hz
- Prices
- ≈ 41% of US
- price level, 2025
- GDP per capita
- $5,767
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Homicide rate
- 7.9
- per 100k, 2022
- Road deaths
- 20.9
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 523
- 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 Martín (13.7833°, -88.9167°, elevation 622 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).