San Fernando weather in September
In September, San Fernando sees average daytime highs of 33°C and overnight lows near 23°C, with 119 mm of rain across 14.5 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.
Highs ease over the month, from about 34°C in the first days to 32°C by the end. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is San Fernando's 11th-clearest and 12th-windiest month. For the whole year in context, see San Fernando's year-round climate.
- Daytime high
- 33°
- 5th warmest
- Overnight low
- 23°
- 9th coldest
- Rainfall
- 119 mm
- 14.5 wet days
- Daylight
- 12 h 06 min
- 6:23 AM – 6:31 PM
- Cloud cover
- 54%
- 11th clearest
- Wind
- 11 km/h
- 12th windiest
- Solar energy
- 5.35 kWh/m²
- Travel score
- 3.3
- out of 10
San Fernando is municipal seat of San Fernando, State of Tamaulipas, Mexico.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 34°C in the first days to 32°C by the end.
A typical September day in San Fernando reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 36°C. Set against its neighbours, September runs about 3°C cooler than August and about 3°C warmer than October.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 34 | 24 |
| 2 | 34 | 24 |
| 3 | 34 | 24 |
| 4 | 34 | 24 |
| 5 | 34 | 24 |
| 6 | 34 | 24 |
| 7 | 34 | 24 |
| 8 | 34 | 24 |
| 9 | 33 | 24 |
| 10 | 33 | 24 |
| 11 | 33 | 24 |
| 12 | 33 | 24 |
| 13 | 33 | 24 |
| 14 | 33 | 24 |
| 15 | 33 | 23 |
| 16 | 33 | 23 |
| 17 | 33 | 23 |
| 18 | 33 | 23 |
| 19 | 33 | 23 |
| 20 | 33 | 23 |
| 21 | 32 | 23 |
| 22 | 32 | 23 |
| 23 | 32 | 23 |
| 24 | 32 | 23 |
| 25 | 32 | 22 |
| 26 | 32 | 22 |
| 27 | 32 | 22 |
| 28 | 32 | 22 |
| 29 | 32 | 22 |
| 30 | 32 | 22 |
How September really feels in San Fernando
Once humidity and wind are folded in, September averages 30 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 September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
San Fernando weather by month
How September compares with the rest of the year at a glance. September is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 23° / 12° | 25 | 4.4 | 10.6 | 7.7 |
| Feb | 25° / 14° | 20 | 3.9 | 11.1 | 7.8 |
| Mar | 28° / 17° | 32 | 4.9 | 11.8 | 6.8 |
| Apr | 31° / 20° | 45 | 5.2 | 12.6 | 5.1 |
| May | 33° / 23° | 49 | 6.5 | 13.2 | 3.8 |
| Jun | 35° / 25° | 63 | 9.9 | 13.5 | 2.8 |
| Jul | 35° / 25° | 69 | 8.8 | 13.4 | 2.6 |
| Aug | 35° / 25° | 57 | 9.5 | 12.9 | 2.4 |
| Sep | 33° / 23° | 119 | 14.5 | 12.2 | 3.3 |
| Oct | 30° / 20° | 67 | 8.2 | 11.4 | 5.4 |
| Nov | 26° / 16° | 35 | 5.3 | 10.8 | 7.5 |
| Dec | 23° / 13° | 24 | 4.1 | 10.5 | 7.9 |
Cloud cover in September
The sky is clear or mostly clear about 39% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 42%. 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 57 | 56 | 55 | 55 | 54 | 54 | 53 | 53 | 53 | 53 | 54 | 55 | 55 | 56 | 56 | 57 | 57 | 58 | 59 | 60 | 61 | 61 | 62 | 63 | 64 | 65 | 65 | 65 | 65 | 65 |
| Cloudier (%) | 43 | 44 | 45 | 45 | 46 | 46 | 47 | 47 | 47 | 47 | 46 | 45 | 45 | 44 | 44 | 43 | 43 | 42 | 41 | 40 | 39 | 39 | 38 | 37 | 36 | 35 | 35 | 35 | 35 | 35 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 57 | 43 |
| 2 | 56 | 44 |
| 3 | 55 | 45 |
| 4 | 55 | 45 |
| 5 | 54 | 46 |
| 6 | 54 | 46 |
| 7 | 53 | 47 |
| 8 | 53 | 47 |
| 9 | 53 | 47 |
| 10 | 53 | 47 |
| 11 | 54 | 46 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 56 | 44 |
| 15 | 56 | 44 |
| 16 | 57 | 43 |
| 17 | 57 | 43 |
| 18 | 58 | 42 |
| 19 | 59 | 41 |
| 20 | 60 | 40 |
| 21 | 61 | 39 |
| 22 | 61 | 39 |
| 23 | 62 | 38 |
| 24 | 63 | 37 |
| 25 | 64 | 36 |
| 26 | 65 | 35 |
| 27 | 65 | 35 |
| 28 | 65 | 35 |
| 29 | 65 | 35 |
| 30 | 65 | 35 |
Chance of precipitation in September
San Fernando gets around 119 mm of rain over 14.5 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 47% and peaks near 54% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 54 | 54 | 54 | 53 | 52 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 44 | 43 | 42 | 40 | 39 | 38 | 37 | 37 | 36 | 35 |
| Rain chance (%) | |
|---|---|
| 1 | 47 |
| 2 | 48 |
| 3 | 49 |
| 4 | 50 |
| 5 | 51 |
| 6 | 52 |
| 7 | 53 |
| 8 | 54 |
| 9 | 54 |
| 10 | 54 |
| 11 | 54 |
| 12 | 53 |
| 13 | 52 |
| 14 | 52 |
| 15 | 51 |
| 16 | 50 |
| 17 | 49 |
| 18 | 48 |
| 19 | 47 |
| 20 | 46 |
| 21 | 44 |
| 22 | 43 |
| 23 | 42 |
| 24 | 40 |
| 25 | 39 |
| 26 | 38 |
| 27 | 37 |
| 28 | 37 |
| 29 | 36 |
| 30 | 35 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 93% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 4 | 4 |
| Humid (%) | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 8 | 9 | 9 | 10 | 11 | 11 | 12 | 12 | 12 |
| Muggy (%) | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 8 | 9 | 9 | 10 | 10 | 11 | 12 | 13 | 14 | 15 | 15 | 16 | 17 | 18 | 19 | 19 | 20 |
| Oppressive (%) | 74 | 72 | 72 | 70 | 70 | 69 | 69 | 67 | 66 | 65 | 65 | 63 | 63 | 60 | 59 | 59 | 57 | 58 | 56 | 54 | 53 | 52 | 51 | 51 | 50 | 49 | 49 | 48 | 48 | 48 |
| Miserable (%) | 21 | 22 | 22 | 23 | 23 | 24 | 24 | 25 | 25 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 25 | 25 | 24 | 23 | 22 | 21 | 19 | 18 | 17 | 16 | 15 | 14 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 1 | 4 | 74 | 21 |
| 2 | 0 | 0 | 2 | 4 | 72 | 22 |
| 3 | 0 | 0 | 2 | 4 | 72 | 22 |
| 4 | 0 | 0 | 2 | 5 | 70 | 23 |
| 5 | 0 | 0 | 2 | 5 | 70 | 23 |
| 6 | 0 | 0 | 2 | 5 | 69 | 24 |
| 7 | 0 | 0 | 2 | 5 | 69 | 24 |
| 8 | 0 | 0 | 3 | 5 | 67 | 25 |
| 9 | 0 | 0 | 3 | 6 | 66 | 25 |
| 10 | 0 | 0 | 3 | 6 | 65 | 26 |
| 11 | 0 | 0 | 3 | 6 | 65 | 26 |
| 12 | 0 | 0 | 3 | 7 | 63 | 27 |
| 13 | 0 | 0 | 3 | 7 | 63 | 27 |
| 14 | 0 | 1 | 4 | 8 | 60 | 27 |
| 15 | 0 | 1 | 4 | 9 | 59 | 27 |
| 16 | 0 | 1 | 4 | 9 | 59 | 27 |
| 17 | 0 | 1 | 5 | 10 | 57 | 27 |
| 18 | 0 | 1 | 5 | 10 | 58 | 26 |
| 19 | 1 | 1 | 6 | 11 | 56 | 25 |
| 20 | 1 | 2 | 6 | 12 | 54 | 25 |
| 21 | 1 | 2 | 7 | 13 | 53 | 24 |
| 22 | 1 | 2 | 8 | 14 | 52 | 23 |
| 23 | 1 | 2 | 9 | 15 | 51 | 22 |
| 24 | 1 | 3 | 9 | 15 | 51 | 21 |
| 25 | 2 | 3 | 10 | 16 | 50 | 19 |
| 26 | 2 | 3 | 11 | 17 | 49 | 18 |
| 27 | 2 | 3 | 11 | 18 | 49 | 17 |
| 28 | 2 | 3 | 12 | 19 | 48 | 16 |
| 29 | 2 | 4 | 12 | 19 | 48 | 15 |
| 30 | 2 | 4 | 12 | 20 | 48 | 14 |
Wind in September
Winds average 11 km/h in September, the calmest month.
Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| 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 |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 12 | calm |
| 2 | 12 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 30 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 42 minutes over September. Sunrise moves from 6:17 AM to 6:28 AM, and sunset from 6:48 PM to 6:16 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.8 |
| Sunrise (AM) | 6:17 | 6:17 | 6:18 | 6:18 | 6:19 | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:22 | 6:22 | 6:22 | 6:23 | 6:23 | 6:23 | 6:24 | 6:24 | 6:25 | 6:25 | 6:25 | 6:26 | 6:26 | 6:26 | 6:27 | 6:27 | 6:28 | 6:28 |
| Sunset (PM) | 6:48 | 6:47 | 6:45 | 6:44 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 | 6:33 | 6:32 | 6:31 | 6:30 | 6:29 | 6:28 | 6:27 | 6:26 | 6:25 | 6:23 | 6:22 | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.5 | 6:17 | 6:48 |
| 2 | 12.5 | 6:17 | 6:47 |
| 3 | 12.5 | 6:18 | 6:45 |
| 4 | 12.4 | 6:18 | 6:44 |
| 5 | 12.4 | 6:19 | 6:43 |
| 6 | 12.4 | 6:19 | 6:42 |
| 7 | 12.4 | 6:19 | 6:41 |
| 8 | 12.3 | 6:20 | 6:40 |
| 9 | 12.3 | 6:20 | 6:39 |
| 10 | 12.3 | 6:20 | 6:38 |
| 11 | 12.3 | 6:21 | 6:37 |
| 12 | 12.2 | 6:21 | 6:36 |
| 13 | 12.2 | 6:22 | 6:35 |
| 14 | 12.2 | 6:22 | 6:33 |
| 15 | 12.2 | 6:22 | 6:32 |
| 16 | 12.1 | 6:23 | 6:31 |
| 17 | 12.1 | 6:23 | 6:30 |
| 18 | 12.1 | 6:23 | 6:29 |
| 19 | 12.1 | 6:24 | 6:28 |
| 20 | 12.0 | 6:24 | 6:27 |
| 21 | 12.0 | 6:25 | 6:26 |
| 22 | 12.0 | 6:25 | 6:25 |
| 23 | 12.0 | 6:25 | 6:23 |
| 24 | 11.9 | 6:26 | 6:22 |
| 25 | 11.9 | 6:26 | 6:21 |
| 26 | 11.9 | 6:26 | 6:20 |
| 27 | 11.9 | 6:27 | 6:19 |
| 28 | 11.8 | 6:27 | 6:18 |
| 29 | 11.8 | 6:28 | 6:17 |
| 30 | 11.8 | 6:28 | 6:16 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.35 kWh/m².
For context, solar energy here swings from a low near 3.35 kWh/m² to a high of 6.8 kWh/m² in July across the year — September's 5.35 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.8 | 5.8 | 5.7 | 5.7 | 5.6 | 5.6 | 5.5 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.1 | 5.1 |
| 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 |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.8 | Bright |
| 2 | 5.8 | Bright |
| 3 | 5.7 | Bright |
| 4 | 5.7 | Bright |
| 5 | 5.6 | Bright |
| 6 | 5.6 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.5 | Bright |
| 9 | 5.5 | Bright |
| 10 | 5.5 | Bright |
| 11 | 5.4 | Bright |
| 12 | 5.4 | Bright |
| 13 | 5.4 | Bright |
| 14 | 5.4 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.3 | Bright |
| 17 | 5.3 | Bright |
| 18 | 5.3 | Bright |
| 19 | 5.3 | Bright |
| 20 | 5.3 | Bright |
| 21 | 5.3 | Bright |
| 22 | 5.3 | Bright |
| 23 | 5.2 | Bright |
| 24 | 5.2 | Bright |
| 25 | 5.2 | Bright |
| 26 | 5.2 | Bright |
| 27 | 5.2 | Bright |
| 28 | 5.2 | Bright |
| 29 | 5.1 | Bright |
| 30 | 5.1 | Bright |
Hazard calendar for San Fernando
In September, San Fernando sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.
San Fernando sits in the Atlantic hurricane belt; the season peaks August–October.
San Fernando's rainy season runs June–October, when most of the year's rain falls.
Is September a good time to visit San Fernando?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in San Fernando.
What to pack for San Fernando in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, San Fernando sees daytime highs around 33°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 15 days see rain.
Sea temperature near San Fernando in September
The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 58 km away) is warmest in September at about 29°C and coldest in February near 20°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) | 21 | 20 | 21 | 23 | 26 | 28 | 28 | 29 | 29 | 28 | 25 | 22 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 20 | Refreshing |
| Mar | 21 | Refreshing |
| Apr | 23 | Refreshing |
| May | 26 | Warm |
| Jun | 28 | Warm |
| Jul | 28 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 25 | Warm |
| Dec | 22 | Refreshing |
UV index in San Fernando in September
Clear-sky midday UV in September 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 Fernando peaks around April 17 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 5 (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) | 5 | 7 | 8 | 12 | 9 | 11 | 11 | 11 | 9 | 9 | 6 | 5 |
| Level | High | High | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | High |
| Feb | 7 | High |
| Mar | 8 | Very high |
| Apr | 12 | Extreme |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 6 | High |
| Dec | 5 | High |
Air quality in San Fernando in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in San Fernando is worst in August — around 34 µg/m³ PM2.5 (moderate), about 5.6× the cleanest month (January, 6 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) | 6 | 8 | 11 | 14 | 23 | 28 | 34 | 34 | 17 | 7 | 6 | 6 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 8 | Good |
| Mar | 11 | Good |
| Apr | 14 | Moderate |
| May | 23 | Moderate |
| Jun | 28 | Moderate |
| Jul | 34 | Moderate |
| Aug | 34 | Moderate |
| Sep | 17 | Moderate |
| Oct | 7 | Good |
| Nov | 6 | Good |
| Dec | 6 | Good |
Where is San Fernando?
San Fernando sits at 24.8°N, 98.1°W, 44 m above sea level, in Mexico. The nearest listed city is Valle Hermoso, 98 km away.
Topography around San Fernando
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Fernando.
Within 3 km, the terrain around San Fernando has only modest variations in elevation — a maximum elevation change of 64 m around an average of 45 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 135 m; within 80 km, large variations in elevation — a maximum elevation change of 1,049 m.
The land around San Fernando is covered by trees (37%), artificial surfaces (29%) and shrubs (21%) within 3 km, cropland (35%), trees (30%) and shrubs (22%) within 16 km, and shrubs (30%) and cropland (21%) within 80 km.
Mexico travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 / 127 V · 60 Hz
- Prices
- ≈ 54% of US
- price level, 2025
- GDP per capita
- $13,889
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 43%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 12.8
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 440
- 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 Fernando (24.8471°, -98.1488°, elevation 44 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).