Rockwall weather in September
In September, Rockwall sees average daytime highs of 87°F and overnight lows near 69°F, with 2.7 in of rain across 6.6 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.
Highs ease over the month, from about 91°F in the first days to 84°F by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels muggy.
Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Rockwall's 1st-clearest and 11th-windiest month. For the whole year in context, see Rockwall's year-round climate.
- Daytime high
- 87°
- 4th warmest
- Overnight low
- 69°
- 9th coldest
- Rainfall
- 2.7 in
- 6.6 wet days
- Daylight
- 12 h 12 min
- 6:14 AM – 6:26 PM
- Cloud cover
- 41%
- 1st clearest
- Wind
- 7 mph
- 11th windiest
- Solar energy
- 5.13 kWh/m²
- Travel score
- 5.3
- out of 10
Rockwall is city in and county seat of Rockwall County, Texas, United States.
- Density
- 582/km²
- people per km²
- Founded
- 1854
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 91°F in the first days to 84°F by the end.
A typical September day in Rockwall reaches about 87°F in the afternoon and slips back to 69°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 95°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F 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 (°F) | 91 | 91 | 91 | 90 | 90 | 90 | 89 | 89 | 89 | 89 | 88 | 88 | 88 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 86 | 85 | 85 | 85 | 85 | 84 | 84 | 84 | 83 | 83 |
| Avg low (°F) | 73 | 73 | 73 | 72 | 72 | 72 | 71 | 71 | 71 | 71 | 70 | 70 | 70 | 69 | 69 | 69 | 68 | 68 | 67 | 67 | 67 | 66 | 66 | 65 | 65 | 65 | 64 | 64 | 64 | 63 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 91 | 73 |
| 2 | 91 | 73 |
| 3 | 91 | 73 |
| 4 | 90 | 72 |
| 5 | 90 | 72 |
| 6 | 90 | 72 |
| 7 | 89 | 71 |
| 8 | 89 | 71 |
| 9 | 89 | 71 |
| 10 | 89 | 71 |
| 11 | 88 | 70 |
| 12 | 88 | 70 |
| 13 | 88 | 70 |
| 14 | 87 | 69 |
| 15 | 87 | 69 |
| 16 | 87 | 69 |
| 17 | 87 | 68 |
| 18 | 86 | 68 |
| 19 | 86 | 67 |
| 20 | 86 | 67 |
| 21 | 86 | 67 |
| 22 | 85 | 66 |
| 23 | 85 | 66 |
| 24 | 85 | 65 |
| 25 | 85 | 65 |
| 26 | 84 | 65 |
| 27 | 84 | 64 |
| 28 | 84 | 64 |
| 29 | 83 | 64 |
| 30 | 83 | 63 |
How September really feels in Rockwall
Once humidity and wind are folded in, September averages 11 days that feel above 90°F and 0 that feel at or below 32°F — 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.
Rockwall weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 56° / 37° | 2.8 | 7.2 | 0.4 | 10.1 | 4.0 |
| Feb | 60° / 41° | 3.0 | 7.8 | 0.6 | 10.8 | 5.0 |
| Mar | 67° / 48° | 4.1 | 9.5 | 0.2 | 11.7 | 6.3 |
| Apr | 74° / 56° | 4.5 | 9.1 | 0 | 12.8 | 7.1 |
| May | 82° / 65° | 5.4 | 11.3 | 0 | 13.7 | 6.0 |
| Jun | 89° / 72° | 3.4 | 8.9 | 0 | 14.1 | 4.3 |
| Jul | 93° / 76° | 1.9 | 6.2 | 0 | 14 | 3.3 |
| Aug | 93° / 75° | 2.1 | 5.6 | 0 | 13.2 | 3.4 |
| Sep | 87° / 69° | 2.7 | 6.6 | 0 | 12.2 | 5.3 |
| Oct | 77° / 57° | 4.0 | 7.9 | 0 | 11.2 | 7.4 |
| Nov | 66° / 47° | 3.7 | 7.3 | 0.1 | 10.3 | 6.5 |
| Dec | 57° / 39° | 3.8 | 7.5 | 0.2 | 9.9 | 4.4 |
Cloud cover in September
The sky is clear or mostly clear about 55% of the time in September, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 30%. 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 (%) | 72 | 71 | 71 | 70 | 70 | 69 | 69 | 69 | 67 | 67 | 67 | 67 | 67 | 67 | 67 | 66 | 67 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 74 | 74 | 75 | 75 | 75 |
| Cloudier (%) | 28 | 29 | 29 | 30 | 30 | 31 | 31 | 31 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 33 | 33 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 26 | 26 | 25 | 25 | 25 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 72 | 28 |
| 2 | 71 | 29 |
| 3 | 71 | 29 |
| 4 | 70 | 30 |
| 5 | 70 | 30 |
| 6 | 69 | 31 |
| 7 | 69 | 31 |
| 8 | 69 | 31 |
| 9 | 67 | 33 |
| 10 | 67 | 33 |
| 11 | 67 | 33 |
| 12 | 67 | 33 |
| 13 | 67 | 33 |
| 14 | 67 | 33 |
| 15 | 67 | 33 |
| 16 | 66 | 34 |
| 17 | 67 | 33 |
| 18 | 67 | 33 |
| 19 | 68 | 32 |
| 20 | 69 | 31 |
| 21 | 70 | 30 |
| 22 | 71 | 29 |
| 23 | 72 | 28 |
| 24 | 73 | 27 |
| 25 | 74 | 26 |
| 26 | 74 | 26 |
| 27 | 74 | 26 |
| 28 | 75 | 25 |
| 29 | 75 | 25 |
| 30 | 75 | 25 |
Chance of precipitation in September
Rockwall gets around 2.7 in of rain over 6.6 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 22% and peaks near 26% 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 (%) | 23 | 24 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 17 | 17 | 18 | 18 |
| Rain chance (%) | |
|---|---|
| 1 | 23 |
| 2 | 24 |
| 3 | 25 |
| 4 | 25 |
| 5 | 25 |
| 6 | 26 |
| 7 | 26 |
| 8 | 26 |
| 9 | 26 |
| 10 | 25 |
| 11 | 25 |
| 12 | 25 |
| 13 | 25 |
| 14 | 24 |
| 15 | 24 |
| 16 | 23 |
| 17 | 23 |
| 18 | 22 |
| 19 | 22 |
| 20 | 21 |
| 21 | 20 |
| 22 | 19 |
| 23 | 18 |
| 24 | 18 |
| 25 | 17 |
| 26 | 17 |
| 27 | 17 |
| 28 | 17 |
| 29 | 18 |
| 30 | 18 |
Humidity in September
Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 52% 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 (%) | 3 | 4 | 5 | 6 | 7 | 7 | 8 | 9 | 9 | 10 | 11 | 11 | 12 | 12 | 13 | 14 | 15 | 16 | 17 | 19 | 21 | 22 | 24 | 26 | 28 | 29 | 31 | 32 | 34 | 35 |
| Comfortable (%) | 8 | 8 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 11 | 11 | 12 | 12 | 13 | 13 | 14 | 15 | 15 | 16 | 17 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 |
| Humid (%) | 20 | 20 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 |
| Muggy (%) | 40 | 39 | 38 | 37 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 35 | 35 | 35 | 34 | 34 | 33 | 32 | 31 | 30 | 29 | 27 | 26 | 25 | 23 | 22 | 21 | 20 | 19 | 18 |
| Oppressive (%) | 29 | 28 | 28 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 11 | 10 | 9 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| 1 | 3 | 8 | 20 | 40 | 29 | 0 |
| 2 | 4 | 8 | 20 | 39 | 28 | 0 |
| 3 | 5 | 9 | 21 | 38 | 28 | 0 |
| 4 | 6 | 9 | 21 | 37 | 27 | 0 |
| 5 | 7 | 9 | 20 | 36 | 27 | 0 |
| 6 | 7 | 10 | 20 | 36 | 26 | 0 |
| 7 | 8 | 10 | 20 | 36 | 26 | 0 |
| 8 | 9 | 10 | 19 | 36 | 26 | 0 |
| 9 | 9 | 10 | 19 | 36 | 25 | 0 |
| 10 | 10 | 10 | 19 | 36 | 25 | 0 |
| 11 | 11 | 10 | 18 | 36 | 25 | 1 |
| 12 | 11 | 11 | 18 | 35 | 24 | 1 |
| 13 | 12 | 11 | 18 | 35 | 24 | 1 |
| 14 | 12 | 12 | 17 | 35 | 23 | 1 |
| 15 | 13 | 12 | 17 | 34 | 23 | 1 |
| 16 | 14 | 13 | 17 | 34 | 22 | 1 |
| 17 | 15 | 13 | 17 | 33 | 21 | 0 |
| 18 | 16 | 14 | 17 | 32 | 20 | 0 |
| 19 | 17 | 15 | 17 | 31 | 19 | 0 |
| 20 | 19 | 15 | 17 | 30 | 18 | 0 |
| 21 | 21 | 16 | 17 | 29 | 17 | 0 |
| 22 | 22 | 17 | 17 | 27 | 16 | 0 |
| 23 | 24 | 18 | 17 | 26 | 15 | 0 |
| 24 | 26 | 18 | 17 | 25 | 14 | 0 |
| 25 | 28 | 19 | 17 | 23 | 13 | 0 |
| 26 | 29 | 19 | 18 | 22 | 12 | 0 |
| 27 | 31 | 19 | 18 | 21 | 11 | 0 |
| 28 | 32 | 19 | 18 | 20 | 11 | 0 |
| 29 | 34 | 19 | 18 | 19 | 10 | 0 |
| 30 | 35 | 19 | 18 | 18 | 9 | 0 |
Wind in September
Winds average 7 mph in September.
Across September, daily wind ranges from about 7 mph on the calmest days to 8 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 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 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | 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 | light breeze |
| 25 | 7 | light breeze |
| 26 | 8 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
Sunrise & sunset in September
Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 60 minutes over September. Sunrise moves from 6:04 AM to 6:24 AM, and sunset from 6:47 PM to 6:07 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) | 12.7 | 12.7 | 12.6 | 12.6 | 12.6 | 12.5 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 |
| Sunrise (AM) | 6:04 | 6:05 | 6:05 | 6:06 | 6:07 | 6:07 | 6:08 | 6:09 | 6:09 | 6:10 | 6:11 | 6:11 | 6:12 | 6:13 | 6:13 | 6:14 | 6:15 | 6:15 | 6:16 | 6:17 | 6:18 | 6:18 | 6:19 | 6:20 | 6:20 | 6:21 | 6:22 | 6:22 | 6:23 | 6:24 |
| Sunset (PM) | 6:47 | 6:46 | 6:44 | 6:43 | 6:42 | 6:40 | 6:39 | 6:37 | 6:36 | 6:35 | 6:33 | 6:32 | 6:30 | 6:29 | 6:28 | 6:26 | 6:25 | 6:23 | 6:22 | 6:21 | 6:19 | 6:18 | 6:16 | 6:15 | 6:13 | 6:12 | 6:11 | 6:09 | 6:08 | 6:07 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.7 | 6:04 | 6:47 |
| 2 | 12.7 | 6:05 | 6:46 |
| 3 | 12.6 | 6:05 | 6:44 |
| 4 | 12.6 | 6:06 | 6:43 |
| 5 | 12.6 | 6:07 | 6:42 |
| 6 | 12.5 | 6:07 | 6:40 |
| 7 | 12.5 | 6:08 | 6:39 |
| 8 | 12.5 | 6:09 | 6:37 |
| 9 | 12.4 | 6:09 | 6:36 |
| 10 | 12.4 | 6:10 | 6:35 |
| 11 | 12.4 | 6:11 | 6:33 |
| 12 | 12.3 | 6:11 | 6:32 |
| 13 | 12.3 | 6:12 | 6:30 |
| 14 | 12.3 | 6:13 | 6:29 |
| 15 | 12.2 | 6:13 | 6:28 |
| 16 | 12.2 | 6:14 | 6:26 |
| 17 | 12.2 | 6:15 | 6:25 |
| 18 | 12.1 | 6:15 | 6:23 |
| 19 | 12.1 | 6:16 | 6:22 |
| 20 | 12.1 | 6:17 | 6:21 |
| 21 | 12.0 | 6:18 | 6:19 |
| 22 | 12.0 | 6:18 | 6:18 |
| 23 | 12.0 | 6:19 | 6:16 |
| 24 | 11.9 | 6:20 | 6:15 |
| 25 | 11.9 | 6:20 | 6:13 |
| 26 | 11.9 | 6:21 | 6:12 |
| 27 | 11.8 | 6:22 | 6:11 |
| 28 | 11.8 | 6:22 | 6:09 |
| 29 | 11.7 | 6:23 | 6:08 |
| 30 | 11.7 | 6:24 | 6:07 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.13 kWh/m².
For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 6.77 kWh/m² in July across the year — September's 5.13 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) | 5.6 | 5.6 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.1 | 5.1 | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 |
| 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 | 5.6 | Bright |
| 2 | 5.6 | Bright |
| 3 | 5.5 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.4 | Bright |
| 7 | 5.4 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.3 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.1 | Bright |
| 14 | 5.1 | Bright |
| 15 | 5.1 | Bright |
| 16 | 5.1 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 5.0 | Bright |
| 20 | 5.0 | Bright |
| 21 | 5.0 | Bright |
| 22 | 5.0 | Bright |
| 23 | 4.9 | Bright |
| 24 | 4.9 | Bright |
| 25 | 4.9 | Bright |
| 26 | 4.9 | Bright |
| 27 | 4.9 | Bright |
| 28 | 4.8 | Bright |
| 29 | 4.8 | Bright |
| 30 | 4.8 | Bright |
Hazard calendar for Rockwall
In September, Rockwall sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Rockwall sits in the Atlantic hurricane belt; the season peaks August–October.
Is September a good time to visit Rockwall?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Rockwall for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Rockwall in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Rockwall sees daytime highs around 87°F and nights near 69°F. Pack light clothes. Worth having: sun protection. About 7 days see rain.
UV index in Rockwall in September
Clear-sky midday UV in September 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 Rockwall peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 3 (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) | 3 | 5 | 6 | 10 | 10 | 10 | 10 | 10 | 8 | 6 | 5 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 10 | Very high |
| May | 10 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 3 | Moderate |
Air quality in Rockwall 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 Rockwall is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (October, 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) | 8 | 8 | 10 | 11 | 14 | 16 | 19 | 15 | 11 | 8 | 8 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 8 | Good |
| Mar | 10 | Good |
| Apr | 11 | Good |
| May | 14 | Moderate |
| Jun | 16 | Moderate |
| Jul | 19 | Moderate |
| Aug | 15 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Rockwall?
Rockwall sits at 32.9°N, 96.5°W, 591 ft above sea level, in United States. The nearest listed city is Rowlett, 6.2 mi away.
Topography around Rockwall
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Rockwall.
Within 2 miles, the terrain around Rockwall has only modest variations in elevation — a maximum elevation change of 187 ft around an average of 509 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 279 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 617 ft.
The land around Rockwall is covered by artificial surfaces (32%), grassland (25%) and water (21%) within 2 miles, grassland (41%) within 10 miles, and grassland (47%) and trees (26%) 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 Rockwall (32.9312°, -96.4597°, elevation 591 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). 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).