San Marcos weather in July
In July, San Marcos sees average daytime highs of 80°F and overnight lows near 65°F, with 0.1 in of rain across 0.4 wet days and about 14 hours of daylight. It is the 3rd-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 80°F through the month. The sky is clear or mostly clear about 83% of the time in July, and the air most often feels humid.
Daylight stretches from about 14 h 12 min at the start of July to 13 h 42 min by month's end. Set against the rest of the year, July is San Marcos's 3rd-clearest and 10th-windiest month. For the whole year in context, see San Marcos's year-round climate.
- Daytime high
- 80°
- 3rd warmest
- Overnight low
- 65°
- 11th coldest
- Rainfall
- 0.1 in
- 0.4 wet days
- Daylight
- 14 hours
- 4:55 AM – 6:54 PM
- Cloud cover
- 20%
- 3rd clearest
- Wind
- 4 mph
- 10th windiest
- Solar energy
- 7.69 kWh/m²
- Travel score
- 8.8
- out of 10
San Marcos is suburb of San Diego, California, United States.
- Density
- 1,471/km²
- people per km²
- Founded
- 1963
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 80°F through the month.
A typical July day in San Marcos reaches about 80°F in the afternoon and slips back to 65°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 86°F. Set against its neighbours, July runs about 5°F warmer than June and about 2°F cooler than August.
| 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) | 79 | 79 | 79 | 79 | 79 | 79 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 |
| Avg low (°F) | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 65 | 66 | 66 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 79 | 63 |
| 2 | 79 | 63 |
| 3 | 79 | 63 |
| 4 | 79 | 63 |
| 5 | 79 | 64 |
| 6 | 79 | 64 |
| 7 | 80 | 64 |
| 8 | 80 | 64 |
| 9 | 80 | 64 |
| 10 | 80 | 64 |
| 11 | 80 | 64 |
| 12 | 80 | 64 |
| 13 | 80 | 64 |
| 14 | 80 | 65 |
| 15 | 80 | 65 |
| 16 | 80 | 65 |
| 17 | 80 | 65 |
| 18 | 80 | 65 |
| 19 | 80 | 65 |
| 20 | 80 | 65 |
| 21 | 81 | 65 |
| 22 | 81 | 65 |
| 23 | 81 | 65 |
| 24 | 81 | 65 |
| 25 | 81 | 65 |
| 26 | 81 | 65 |
| 27 | 81 | 65 |
| 28 | 81 | 65 |
| 29 | 81 | 65 |
| 30 | 81 | 66 |
| 31 | 81 | 66 |
San Marcos weather by month
How July compares with the rest of the year at a glance. July is the 3rd-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 64° / 47° | 2.9 | 5.8 | 10.1 | 6.7 |
| Feb | 64° / 48° | 3.6 | 6.8 | 10.8 | 6.4 |
| Mar | 65° / 50° | 2.2 | 6.2 | 11.7 | 6.8 |
| Apr | 68° / 53° | 1.1 | 4.1 | 12.8 | 7.5 |
| May | 71° / 56° | 0.5 | 2.1 | 13.7 | 8.1 |
| Jun | 75° / 60° | 0.1 | 0.5 | 14.1 | 9.1 |
| Jul | 80° / 65° | 0.1 | 0.4 | 14 | 8.8 |
| Aug | 82° / 66° | 0.0 | 0.2 | 13.2 | 8.5 |
| Sep | 81° / 64° | 0.1 | 0.7 | 12.2 | 8.6 |
| Oct | 76° / 59° | 0.7 | 2.6 | 11.2 | 8.7 |
| Nov | 70° / 52° | 1.1 | 3.5 | 10.3 | 7.9 |
| Dec | 64° / 47° | 2.1 | 5.1 | 9.9 | 6.8 |
Cloud cover in July
The sky is clear or mostly clear about 83% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 7% of July, with mostly cloudy or overcast conditions the remaining 9%.
| 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 (%) | 92 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 90 | 90 | 90 | 90 | 91 | 91 | 91 | 90 | 90 | 90 | 90 | 89 | 89 | 90 | 91 | 91 | 91 | 92 | 92 |
| Cloudier (%) | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 11 | 11 | 10 | 9 | 9 | 9 | 8 | 8 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 92 | 8 |
| 2 | 91 | 9 |
| 3 | 91 | 9 |
| 4 | 91 | 9 |
| 5 | 91 | 9 |
| 6 | 91 | 9 |
| 7 | 91 | 9 |
| 8 | 91 | 9 |
| 9 | 91 | 9 |
| 10 | 91 | 9 |
| 11 | 91 | 9 |
| 12 | 91 | 9 |
| 13 | 90 | 10 |
| 14 | 90 | 10 |
| 15 | 90 | 10 |
| 16 | 90 | 10 |
| 17 | 91 | 9 |
| 18 | 91 | 9 |
| 19 | 91 | 9 |
| 20 | 90 | 10 |
| 21 | 90 | 10 |
| 22 | 90 | 10 |
| 23 | 90 | 10 |
| 24 | 89 | 11 |
| 25 | 89 | 11 |
| 26 | 90 | 10 |
| 27 | 91 | 9 |
| 28 | 91 | 9 |
| 29 | 91 | 9 |
| 30 | 92 | 8 |
| 31 | 92 | 8 |
Chance of precipitation in July
San Marcos gets around 0.1 in of rain over 0.4 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 1% and peaks near 2% 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 (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 |
| Rain chance (%) | |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 1 |
| 15 | 1 |
| 16 | 1 |
| 17 | 1 |
| 18 | 1 |
| 19 | 1 |
| 20 | 1 |
| 21 | 1 |
| 22 | 1 |
| 23 | 1 |
| 24 | 1 |
| 25 | 1 |
| 26 | 1 |
| 27 | 2 |
| 28 | 2 |
| 29 | 2 |
| 30 | 2 |
| 31 | 2 |
Humidity in July
Most of July feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the humid band about 54% of days. Sticky, muggy-or-worse air turns up on roughly 17% 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 (%) | 3 | 3 | 2 | 2 | 2 | 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 |
| Comfortable (%) | 48 | 47 | 45 | 43 | 41 | 40 | 38 | 36 | 34 | 33 | 31 | 30 | 28 | 27 | 26 | 25 | 24 | 24 | 23 | 22 | 22 | 21 | 21 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 20 |
| Humid (%) | 41 | 43 | 44 | 46 | 47 | 49 | 50 | 51 | 52 | 54 | 55 | 55 | 57 | 57 | 58 | 58 | 58 | 57 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 55 |
| Muggy (%) | 7 | 8 | 8 | 9 | 10 | 10 | 11 | 12 | 13 | 13 | 14 | 15 | 15 | 16 | 16 | 17 | 17 | 18 | 18 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 23 | 23 | 23 | 24 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 3 | 48 | 41 | 7 | 0 |
| 2 | 3 | 47 | 43 | 8 | 0 |
| 3 | 2 | 45 | 44 | 8 | 0 |
| 4 | 2 | 43 | 46 | 9 | 0 |
| 5 | 2 | 41 | 47 | 10 | 0 |
| 6 | 1 | 40 | 49 | 10 | 0 |
| 7 | 1 | 38 | 50 | 11 | 0 |
| 8 | 1 | 36 | 51 | 12 | 0 |
| 9 | 1 | 34 | 52 | 13 | 0 |
| 10 | 0 | 33 | 54 | 13 | 0 |
| 11 | 0 | 31 | 55 | 14 | 0 |
| 12 | 0 | 30 | 55 | 15 | 0 |
| 13 | 0 | 28 | 57 | 15 | 0 |
| 14 | 0 | 27 | 57 | 16 | 0 |
| 15 | 0 | 26 | 58 | 16 | 0 |
| 16 | 0 | 25 | 58 | 17 | 0 |
| 17 | 0 | 24 | 58 | 17 | 1 |
| 18 | 0 | 24 | 57 | 18 | 1 |
| 19 | 0 | 23 | 58 | 18 | 1 |
| 20 | 0 | 22 | 58 | 19 | 1 |
| 21 | 0 | 22 | 58 | 19 | 1 |
| 22 | 0 | 21 | 58 | 20 | 1 |
| 23 | 0 | 21 | 58 | 20 | 1 |
| 24 | 0 | 20 | 58 | 21 | 1 |
| 25 | 0 | 20 | 58 | 21 | 1 |
| 26 | 0 | 19 | 58 | 22 | 1 |
| 27 | 0 | 19 | 58 | 22 | 1 |
| 28 | 0 | 19 | 57 | 23 | 1 |
| 29 | 0 | 19 | 57 | 23 | 1 |
| 30 | 0 | 19 | 57 | 23 | 1 |
| 31 | 0 | 20 | 55 | 24 | 1 |
Wind in July
Winds average 4 mph in July.
Across July, daily wind ranges from about 4 mph on the calmest days to 4 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) | 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 (mph) | 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 July
Daylight runs from about 14 h 12 min at the start of July to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 30 minutes over July. Sunrise moves from 4:47 AM to 5:04 AM, and sunset from 6:57 PM to 6:45 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) | 14.2 | 14.2 | 14.2 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 14.0 | 13.9 | 13.9 | 13.9 | 13.9 | 13.9 | 13.8 | 13.8 | 13.8 | 13.8 | 13.8 | 13.7 | 13.7 | 13.7 |
| Sunrise (AM) | 4:47 | 4:47 | 4:48 | 4:48 | 4:49 | 4:49 | 4:50 | 4:50 | 4:51 | 4:51 | 4:52 | 4:52 | 4:53 | 4:53 | 4:54 | 4:55 | 4:55 | 4:56 | 4:56 | 4:57 | 4:58 | 4:58 | 4:59 | 5:00 | 5:00 | 5:01 | 5:02 | 5:02 | 5:03 | 5:04 | 5:04 |
| Sunset (PM) | 6:57 | 6:57 | 6:57 | 6:57 | 6:57 | 6:57 | 6:57 | 6:56 | 6:56 | 6:56 | 6:56 | 6:55 | 6:55 | 6:55 | 6:54 | 6:54 | 6:54 | 6:53 | 6:53 | 6:52 | 6:52 | 6:51 | 6:51 | 6:50 | 6:49 | 6:49 | 6:48 | 6:47 | 6:47 | 6:46 | 6:45 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.2 | 4:47 | 6:57 |
| 2 | 14.2 | 4:47 | 6:57 |
| 3 | 14.2 | 4:48 | 6:57 |
| 4 | 14.1 | 4:48 | 6:57 |
| 5 | 14.1 | 4:49 | 6:57 |
| 6 | 14.1 | 4:49 | 6:57 |
| 7 | 14.1 | 4:50 | 6:57 |
| 8 | 14.1 | 4:50 | 6:56 |
| 9 | 14.1 | 4:51 | 6:56 |
| 10 | 14.1 | 4:51 | 6:56 |
| 11 | 14.1 | 4:52 | 6:56 |
| 12 | 14.1 | 4:52 | 6:55 |
| 13 | 14.0 | 4:53 | 6:55 |
| 14 | 14.0 | 4:53 | 6:55 |
| 15 | 14.0 | 4:54 | 6:54 |
| 16 | 14.0 | 4:55 | 6:54 |
| 17 | 14.0 | 4:55 | 6:54 |
| 18 | 14.0 | 4:56 | 6:53 |
| 19 | 13.9 | 4:56 | 6:53 |
| 20 | 13.9 | 4:57 | 6:52 |
| 21 | 13.9 | 4:58 | 6:52 |
| 22 | 13.9 | 4:58 | 6:51 |
| 23 | 13.9 | 4:59 | 6:51 |
| 24 | 13.8 | 5:00 | 6:50 |
| 25 | 13.8 | 5:00 | 6:49 |
| 26 | 13.8 | 5:01 | 6:49 |
| 27 | 13.8 | 5:02 | 6:48 |
| 28 | 13.8 | 5:02 | 6:47 |
| 29 | 13.7 | 5:03 | 6:47 |
| 30 | 13.7 | 5:04 | 6:46 |
| 31 | 13.7 | 5:04 | 6:45 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 7.69 kWh/m².
For context, solar energy here swings from a low near 3.08 kWh/m² to a high of 7.96 kWh/m² in June across the year — July's 7.69 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) | 8.0 | 8.0 | 8.0 | 7.9 | 7.9 | 7.9 | 7.9 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.8 | 7.7 | 7.7 | 7.7 | 7.7 | 7.7 | 7.6 | 7.6 | 7.6 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 8.0 | Intense |
| 2 | 8.0 | Intense |
| 3 | 8.0 | Intense |
| 4 | 7.9 | Intense |
| 5 | 7.9 | Intense |
| 6 | 7.9 | Intense |
| 7 | 7.9 | Intense |
| 8 | 7.8 | Intense |
| 9 | 7.8 | Intense |
| 10 | 7.8 | Intense |
| 11 | 7.8 | Intense |
| 12 | 7.8 | Intense |
| 13 | 7.8 | Intense |
| 14 | 7.7 | Intense |
| 15 | 7.7 | Intense |
| 16 | 7.7 | Intense |
| 17 | 7.7 | Intense |
| 18 | 7.7 | Intense |
| 19 | 7.6 | Intense |
| 20 | 7.6 | Intense |
| 21 | 7.6 | Intense |
| 22 | 7.6 | Intense |
| 23 | 7.6 | Intense |
| 24 | 7.6 | Intense |
| 25 | 7.5 | Intense |
| 26 | 7.5 | Intense |
| 27 | 7.5 | Intense |
| 28 | 7.5 | Intense |
| 29 | 7.5 | Intense |
| 30 | 7.5 | Intense |
| 31 | 7.5 | Intense |
Is July a good time to visit San Marcos?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is one of the better times to visit San Marcos for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Marcos in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, San Marcos sees daytime highs around 80°F and nights near 65°F. Pack sun protection. Worth having: light clothes.
Sea temperature near San Marcos in July
The nearest coast averages about 69°F in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 12 mi away) is warmest in August at about 71°F and coldest in January near 59°F.
It's comfortable for a long swim from Jul 5 to Oct 7 — about 3.1 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 59 | 59 | 60 | 61 | 64 | 66 | 69 | 71 | 70 | 67 | 64 | 61 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 59 | Cool |
| Feb | 59 | Cool |
| Mar | 60 | Cool |
| Apr | 61 | Cool |
| May | 64 | Cool |
| Jun | 66 | Cool |
| Jul | 69 | Refreshing |
| Aug | 71 | Refreshing |
| Sep | 70 | Refreshing |
| Oct | 67 | Cool |
| Nov | 64 | Cool |
| Dec | 61 | Cool |
UV index in San Marcos in July
Clear-sky midday UV in July 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 Marcos peaks around July 11 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 10 | 8 | 6 | 4 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in San Marcos in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in San Marcos is worst in September — around 26 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (May, 8 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) | 12 | 12 | 12 | 11 | 8 | 11 | 11 | 15 | 26 | 14 | 12 | 16 |
| Level | Good | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Good |
| Feb | 12 | Moderate |
| Mar | 12 | Moderate |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 11 | Good |
| Jul | 11 | Good |
| Aug | 15 | Moderate |
| Sep | 26 | Moderate |
| Oct | 14 | Moderate |
| Nov | 12 | Moderate |
| Dec | 16 | Moderate |
Where is San Marcos?
San Marcos sits at 33.1°N, 117.2°W, 581 ft above sea level, in United States. The nearest listed city is Escondido, 5.0 mi away.
Topography around San Marcos
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of San Marcos.
Within 2 miles, the terrain around San Marcos has only modest variations in elevation — a maximum elevation change of 814 ft around an average of 699 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,093 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,537 ft.
The land around San Marcos is covered by artificial surfaces (54%) and trees (20%) within 2 miles, trees (35%) and artificial surfaces (32%) within 10 miles, and shrubs (27%) and water (24%) 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 San Marcos (33.1434°, -117.1661°, elevation 581 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. 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).