Harlingen weather in March
In March, Harlingen sees average daytime highs of 80°F and overnight lows near 62°F, with 1.6 in of rain across 5.5 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.
Highs climb over the month, from about 78°F in the first days to 82°F by the end. The sky is clear or mostly clear about 36% of the time in March, and the air most often feels muggy.
Daylight stretches from about 11 h 24 min at the start of March to 12 h 12 min by month's end. Set against the rest of the year, March is Harlingen's 9th-clearest and 3rd-windiest month. For the whole year in context, see Harlingen's year-round climate.
- Daytime high
- 80°
- 8th warmest
- Overnight low
- 62°
- 5th coldest
- Rainfall
- 1.6 in
- 5.5 wet days
- Daylight
- 11 h 48 min
- 6:46 AM – 6:35 PM
- Cloud cover
- 55%
- 9th clearest
- Wind
- 11 mph
- 3rd windiest
- Solar energy
- 4.69 kWh/m²
- Travel score
- 7.2
- out of 10
Harlingen is city in Cameron County, Texas, United States.
- Density
- 630/km²
- people per km²
- Founded
- 1904
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in March
Highs climb over the month, from about 78°F in the first days to 82°F by the end.
A typical March day in Harlingen reaches about 80°F in the afternoon and slips back to 62°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 89°F. Set against its neighbours, March runs about 5°F warmer than February and about 5°F cooler than April.
| 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 (°F) | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 78 | 79 | 79 | 79 | 79 | 79 | 80 | 80 | 80 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 82 | 82 | 82 | 82 | 82 | 82 | 83 | 83 |
| Avg low (°F) | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 60 | 60 | 61 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 78 | 59 |
| 2 | 78 | 59 |
| 3 | 78 | 59 |
| 4 | 78 | 60 |
| 5 | 78 | 60 |
| 6 | 78 | 60 |
| 7 | 78 | 60 |
| 8 | 78 | 60 |
| 9 | 79 | 60 |
| 10 | 79 | 61 |
| 11 | 79 | 61 |
| 12 | 79 | 61 |
| 13 | 79 | 62 |
| 14 | 80 | 62 |
| 15 | 80 | 62 |
| 16 | 80 | 62 |
| 17 | 80 | 62 |
| 18 | 80 | 63 |
| 19 | 80 | 63 |
| 20 | 81 | 63 |
| 21 | 81 | 63 |
| 22 | 81 | 64 |
| 23 | 81 | 64 |
| 24 | 82 | 64 |
| 25 | 82 | 64 |
| 26 | 82 | 64 |
| 27 | 82 | 65 |
| 28 | 82 | 65 |
| 29 | 82 | 65 |
| 30 | 83 | 65 |
| 31 | 83 | 65 |
How March really feels in Harlingen
Once humidity and wind are folded in, March averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
March sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Harlingen weather by month
How March compares with the rest of the year at a glance. March is the 8th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 71° / 53° | 1.2 | 5.1 | 10.5 | 7.3 |
| Feb | 75° / 57° | 1.0 | 4.9 | 11.1 | 7.6 |
| Mar | 80° / 62° | 1.6 | 5.5 | 11.8 | 7.2 |
| Apr | 85° / 68° | 1.7 | 5.5 | 12.6 | 5.7 |
| May | 90° / 73° | 1.9 | 6.5 | 13.3 | 4.3 |
| Jun | 94° / 77° | 2.3 | 8.9 | 13.6 | 3.1 |
| Jul | 95° / 78° | 2.4 | 8.5 | 13.5 | 2.6 |
| Aug | 95° / 78° | 2.1 | 9.4 | 12.9 | 2.5 |
| Sep | 91° / 75° | 4.1 | 14.4 | 12.2 | 3.4 |
| Oct | 86° / 68° | 2.7 | 7.9 | 11.4 | 5.5 |
| Nov | 78° / 61° | 1.5 | 6.5 | 10.7 | 7.4 |
| Dec | 73° / 55° | 1.3 | 5.5 | 10.4 | 7.4 |
Cloud cover in March
The sky is clear or mostly clear about 36% of the time in March.
Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 49%.
| 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 | 51 | 51 | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 50 | 50 | 51 | 52 | 52 | 53 | 54 | 54 | 54 | 54 | 53 | 54 | 53 | 53 | 52 | 52 | 51 | 50 | 50 | 50 | 50 |
| Cloudier (%) | 49 | 49 | 49 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 50 | 50 | 49 | 48 | 48 | 47 | 46 | 46 | 46 | 46 | 47 | 46 | 47 | 47 | 48 | 48 | 49 | 50 | 50 | 50 | 50 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 51 | 49 |
| 2 | 51 | 49 |
| 3 | 51 | 49 |
| 4 | 50 | 50 |
| 5 | 50 | 50 |
| 6 | 49 | 51 |
| 7 | 49 | 51 |
| 8 | 49 | 51 |
| 9 | 49 | 51 |
| 10 | 49 | 51 |
| 11 | 50 | 50 |
| 12 | 50 | 50 |
| 13 | 51 | 49 |
| 14 | 52 | 48 |
| 15 | 52 | 48 |
| 16 | 53 | 47 |
| 17 | 54 | 46 |
| 18 | 54 | 46 |
| 19 | 54 | 46 |
| 20 | 54 | 46 |
| 21 | 53 | 47 |
| 22 | 54 | 46 |
| 23 | 53 | 47 |
| 24 | 53 | 47 |
| 25 | 52 | 48 |
| 26 | 52 | 48 |
| 27 | 51 | 49 |
| 28 | 50 | 50 |
| 29 | 50 | 50 |
| 30 | 50 | 50 |
| 31 | 50 | 50 |
Chance of precipitation in March
Harlingen gets around 1.6 in of rain over 5.5 wet days in March. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 18% and peaks near 21% 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 (%) | 17 | 17 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 18 | 17 | 17 | 16 | 16 | 16 | 15 | 15 | 16 | 16 | 17 | 17 | 18 |
| Rain chance (%) | |
|---|---|
| 1 | 17 |
| 2 | 17 |
| 3 | 18 |
| 4 | 18 |
| 5 | 19 |
| 6 | 19 |
| 7 | 20 |
| 8 | 20 |
| 9 | 21 |
| 10 | 21 |
| 11 | 21 |
| 12 | 21 |
| 13 | 21 |
| 14 | 21 |
| 15 | 20 |
| 16 | 20 |
| 17 | 19 |
| 18 | 19 |
| 19 | 18 |
| 20 | 17 |
| 21 | 17 |
| 22 | 16 |
| 23 | 16 |
| 24 | 16 |
| 25 | 15 |
| 26 | 15 |
| 27 | 16 |
| 28 | 16 |
| 29 | 17 |
| 30 | 17 |
| 31 | 18 |
Humidity in March
Most of March feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, March lands in the muggy band about 34% of days. Sticky, muggy-or-worse air turns up on roughly 39% 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 (%) | 40 | 40 | 40 | 40 | 40 | 39 | 38 | 37 | 36 | 35 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 20 | 19 | 19 |
| Comfortable (%) | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 13 | 13 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 |
| Humid (%) | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 17 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 20 | 20 | 20 | 19 |
| Muggy (%) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 32 | 32 | 33 | 34 | 34 | 35 | 36 | 37 | 38 | 38 | 38 | 38 | 38 | 39 | 39 | 38 | 38 | 38 |
| Oppressive (%) | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 8 | 9 | 9 | 10 | 11 | 12 | 13 | 15 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 40 | 13 | 15 | 30 | 1 |
| 2 | 40 | 13 | 15 | 30 | 1 |
| 3 | 40 | 13 | 15 | 30 | 1 |
| 4 | 40 | 13 | 15 | 30 | 2 |
| 5 | 40 | 14 | 15 | 30 | 2 |
| 6 | 39 | 14 | 15 | 30 | 2 |
| 7 | 38 | 14 | 16 | 30 | 2 |
| 8 | 37 | 14 | 16 | 30 | 2 |
| 9 | 36 | 15 | 17 | 30 | 3 |
| 10 | 35 | 15 | 18 | 30 | 3 |
| 11 | 33 | 15 | 18 | 31 | 3 |
| 12 | 32 | 15 | 19 | 31 | 3 |
| 13 | 31 | 15 | 19 | 31 | 3 |
| 14 | 30 | 15 | 20 | 32 | 4 |
| 15 | 29 | 15 | 20 | 32 | 4 |
| 16 | 28 | 15 | 21 | 33 | 4 |
| 17 | 27 | 14 | 21 | 34 | 4 |
| 18 | 26 | 14 | 22 | 34 | 4 |
| 19 | 25 | 13 | 22 | 35 | 5 |
| 20 | 24 | 13 | 22 | 36 | 5 |
| 21 | 23 | 12 | 22 | 37 | 6 |
| 22 | 22 | 12 | 22 | 38 | 6 |
| 23 | 22 | 11 | 22 | 38 | 7 |
| 24 | 21 | 11 | 22 | 38 | 8 |
| 25 | 21 | 11 | 22 | 38 | 9 |
| 26 | 21 | 10 | 21 | 38 | 9 |
| 27 | 20 | 10 | 21 | 39 | 10 |
| 28 | 20 | 10 | 20 | 39 | 11 |
| 29 | 20 | 10 | 20 | 38 | 12 |
| 30 | 19 | 9 | 20 | 38 | 13 |
| 31 | 19 | 9 | 19 | 38 | 15 |
Wind in March
Winds average 11 mph in March.
Across March, daily wind ranges from about 11 mph on the calmest days to 12 mph 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 (mph) | 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 | 12 | 12 | 12 | 12 | 12 | 12 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 11 | light breeze |
| 2 | 11 | light breeze |
| 3 | 11 | light breeze |
| 4 | 11 | light breeze |
| 5 | 11 | light breeze |
| 6 | 11 | light breeze |
| 7 | 11 | light breeze |
| 8 | 11 | light breeze |
| 9 | 11 | light breeze |
| 10 | 11 | light breeze |
| 11 | 11 | light breeze |
| 12 | 11 | light breeze |
| 13 | 11 | light breeze |
| 14 | 11 | light breeze |
| 15 | 11 | light breeze |
| 16 | 11 | light breeze |
| 17 | 11 | light breeze |
| 18 | 11 | light breeze |
| 19 | 11 | light breeze |
| 20 | 11 | light breeze |
| 21 | 11 | light breeze |
| 22 | 11 | light breeze |
| 23 | 11 | light breeze |
| 24 | 11 | light breeze |
| 25 | 11 | light breeze |
| 26 | 12 | light breeze |
| 27 | 12 | light breeze |
| 28 | 12 | light breeze |
| 29 | 12 | light breeze |
| 30 | 12 | light breeze |
| 31 | 12 | light breeze |
Sunrise & sunset in March
Daylight runs from about 11 h 24 min at the start of March to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 48 minutes over March. Sunrise moves from 7:01 AM to 6:30 AM, and sunset from 6:27 PM to 6:42 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) | 11.4 | 11.4 | 11.5 | 11.5 | 11.5 | 11.5 | 11.6 | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 | 12.2 | 12.2 | 12.2 |
| Sunrise (AM) | 7:01 | 7:00 | 7:00 | 6:59 | 6:58 | 6:57 | 6:56 | 6:55 | 6:54 | 6:53 | 6:51 | 6:50 | 6:49 | 6:48 | 6:47 | 6:46 | 6:45 | 6:44 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:37 | 6:36 | 6:35 | 6:34 | 6:33 | 6:32 | 6:31 | 6:30 |
| Sunset (PM) | 6:27 | 6:27 | 6:28 | 6:28 | 6:29 | 6:29 | 6:30 | 6:31 | 6:31 | 6:32 | 6:32 | 6:33 | 6:33 | 6:34 | 6:34 | 6:35 | 6:35 | 6:36 | 6:36 | 6:37 | 6:37 | 6:38 | 6:38 | 6:39 | 6:39 | 6:40 | 6:40 | 6:40 | 6:41 | 6:41 | 6:42 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.4 | 7:01 | 6:27 |
| 2 | 11.4 | 7:00 | 6:27 |
| 3 | 11.5 | 7:00 | 6:28 |
| 4 | 11.5 | 6:59 | 6:28 |
| 5 | 11.5 | 6:58 | 6:29 |
| 6 | 11.5 | 6:57 | 6:29 |
| 7 | 11.6 | 6:56 | 6:30 |
| 8 | 11.6 | 6:55 | 6:31 |
| 9 | 11.6 | 6:54 | 6:31 |
| 10 | 11.7 | 6:53 | 6:32 |
| 11 | 11.7 | 6:51 | 6:32 |
| 12 | 11.7 | 6:50 | 6:33 |
| 13 | 11.7 | 6:49 | 6:33 |
| 14 | 11.8 | 6:48 | 6:34 |
| 15 | 11.8 | 6:47 | 6:34 |
| 16 | 11.8 | 6:46 | 6:35 |
| 17 | 11.8 | 6:45 | 6:35 |
| 18 | 11.9 | 6:44 | 6:36 |
| 19 | 11.9 | 6:43 | 6:36 |
| 20 | 11.9 | 6:42 | 6:37 |
| 21 | 11.9 | 6:41 | 6:37 |
| 22 | 12.0 | 6:40 | 6:38 |
| 23 | 12.0 | 6:39 | 6:38 |
| 24 | 12.0 | 6:37 | 6:39 |
| 25 | 12.0 | 6:36 | 6:39 |
| 26 | 12.1 | 6:35 | 6:40 |
| 27 | 12.1 | 6:34 | 6:40 |
| 28 | 12.1 | 6:33 | 6:40 |
| 29 | 12.2 | 6:32 | 6:41 |
| 30 | 12.2 | 6:31 | 6:41 |
| 31 | 12.2 | 6:30 | 6:42 |
Solar energy in March
Average shortwave solar energy reaching the ground each day in March, about 4.69 kWh/m².
For context, solar energy here swings from a low near 2.91 kWh/m² to a high of 6.72 kWh/m² in July across the year — March's 4.69 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) | 4.2 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.4 | 4.4 | 4.4 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.7 | 4.7 | 4.8 | 4.8 | 4.8 | 4.9 | 4.9 | 4.9 | 5.0 | 5.0 | 5.0 | 5.1 | 5.1 | 5.1 | 5.2 | 5.2 |
| 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 | 4.2 | Bright |
| 2 | 4.3 | Bright |
| 3 | 4.3 | Bright |
| 4 | 4.3 | Bright |
| 5 | 4.3 | Bright |
| 6 | 4.3 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.5 | Bright |
| 11 | 4.5 | Bright |
| 12 | 4.5 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.6 | Bright |
| 16 | 4.7 | Bright |
| 17 | 4.7 | Bright |
| 18 | 4.8 | Bright |
| 19 | 4.8 | Bright |
| 20 | 4.8 | Bright |
| 21 | 4.9 | Bright |
| 22 | 4.9 | Bright |
| 23 | 4.9 | Bright |
| 24 | 5.0 | Bright |
| 25 | 5.0 | Bright |
| 26 | 5.0 | Bright |
| 27 | 5.1 | Bright |
| 28 | 5.1 | Bright |
| 29 | 5.1 | Bright |
| 30 | 5.2 | Bright |
| 31 | 5.2 | Bright |
Hazard calendar for Harlingen
None of Harlingen's seasonal hazards are active in March. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Harlingen sits in the Atlantic hurricane belt; the season peaks August–October.
Is March a good time to visit Harlingen?
Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
March is one of the better times to visit Harlingen for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Harlingen in March
From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In March, Harlingen sees daytime highs around 80°F and nights near 62°F. Worth packing: light clothes and sun protection. About 6 days see rain.
Sea temperature near Harlingen in March
The nearest coast averages about 67°F in March — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 35 mi away) is warmest in September at about 84°F and coldest in February near 65°F.
It's comfortable for a long swim from Mar 22 to Dec 29 — about 9.3 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 66 | 65 | 67 | 72 | 77 | 82 | 82 | 83 | 84 | 81 | 75 | 70 |
| Comfort | Cool | Cool | Cool | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 66 | Cool |
| Feb | 65 | Cool |
| Mar | 67 | Cool |
| Apr | 72 | Refreshing |
| May | 77 | Warm |
| Jun | 82 | Warm |
| Jul | 82 | Tropical |
| Aug | 83 | Tropical |
| Sep | 84 | Tropical |
| Oct | 81 | Warm |
| Nov | 75 | Refreshing |
| Dec | 70 | Refreshing |
UV index in Harlingen in March
Clear-sky midday UV in March peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Harlingen peaks around June 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 5 (moderate).
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 | 11 | 9 | 12 | 11 | 11 | 10 | 8 | 6 | 5 |
| Level | Moderate | High | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 5 | Moderate |
| Feb | 7 | High |
| Mar | 8 | Very high |
| Apr | 11 | Extreme |
| May | 9 | Very high |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 5 | Moderate |
Air quality in Harlingen in March
Average fine-particle pollution (PM2.5) through the year — so you can see where March falls, not just the annual average.
Air quality in Harlingen is worst in July — around 25 µg/m³ PM2.5 (moderate), about 3.7× the cleanest month (October, 7 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) | 8 | 9 | 11 | 13 | 19 | 20 | 25 | 18 | 13 | 7 | 7 | 9 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 11 | Good |
| Apr | 13 | Moderate |
| May | 19 | Moderate |
| Jun | 20 | Moderate |
| Jul | 25 | Moderate |
| Aug | 18 | Moderate |
| Sep | 13 | Moderate |
| Oct | 7 | Good |
| Nov | 7 | Good |
| Dec | 9 | Good |
Where is Harlingen?
Harlingen sits at 26.2°N, 97.7°W, 39 ft above sea level, in United States. The nearest listed city is San Benito, 5.6 mi away.
Topography around Harlingen
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Harlingen.
Within 2 miles, the terrain around Harlingen has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 43 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 82 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 446 ft.
The land around Harlingen is covered by artificial surfaces (56%) and trees (25%) within 2 miles, cropland (52%) and grassland (22%) within 10 miles, and cropland (34%), grassland (22%) and water (20%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Harlingen (26.1906°, -97.6961°, elevation 39 ft), 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).