Houston is 4.4°C (7.9°F) warmer by day, Houston has 5°C (9°F) warmer nights, Marietta gets 58 mm (2.3 in) more rain a year.
Houston is at its warmest in August and coolest in January, while Marietta peaks in July and bottoms out in January. Month for month, Houston is the warmer of the two in 12 of 12 months.
Marietta is the wetter of the two, collecting 1,301 mm (51.2 in) of rain a year against 1,243 mm (48.9 in) in Houston. The most comfortable time to visit is April, May and October in Houston and May, June and September in Marietta.
| Houston | Metric | Marietta |
|---|---|---|
| 🌡️ Temperature | ||
| 79.3°F | 🌡️Average daytime high | 71.4°F |
| 59.2°F | 🌙Average nighttime low | 50.2°F |
| August | 🔥Hottest month | July |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 48.9 in | 🌧️Annual rainfall | 51.2 in |
| May | ☔Wettest month | February |
| February | 🏜️Driest month | October |
| 💨 Climate | ||
| 77% | 💧Average humidity | 76% |
| 1.8 m/s | 💨Average wind speed | 1.1 m/s |
Overnight, Houston typically falls to around 15.1°C (59.2°F) while Marietta settles near 10.1°C (50.2°F).
Houston is hottest in August and coldest in January, whereas Marietta peaks in July and is coolest in January.
Houston sees the most rain in May and the least in February; Marietta is wettest in February and driest in October.
Houston feels the more humid of the two, averaging 77% relative humidity against 76%.
For Marietta, the pick of the year is May, June and September.
Month by month, here is the coldest night, the average day and the hottest afternoon each city can expect. Switch Compare to read rainfall, humidity, wind or solar instead, and Period to move between the long-term 45-year average and any single year — the shading is a quick warm-to-cool guide.
| Month | Houston | Marietta | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 40.6 | 50.9❄️ | 61.2 | 30.7 | 40.5❄️ | 50 |
| February | 44.4 | 54.7 | 65.1 | 34.5 | 44.8 | 54.9 |
| March | 50.9 | 61.5 | 72.3 | 40.6 | 51.6 | 62.6 |
| April | 58.1 | 68.7 | 79.5 | 48.2 | 59.4 | 70.3 |
| May | 66.7 | 76.5 | 86.4 | 57.6 | 68 | 78.6 |
| June | 73 | 82.4 | 91.8 | 65.8 | 76.1 | 86.4 |
| July | 74.7 | 84 | 93.2 | 69.6 | 80.1🔥 | 90.7 |
| August | 75 | 84.9🔥 | 94.8 | 68.5 | 79.3 | 90 |
| September | 70.2 | 80.2 | 90.1 | 62.1 | 73.2 | 84.4 |
| October | 60.8 | 71.6 | 82.4 | 50.7 | 62.4 | 74.1 |
| November | 50.9 | 61.3 | 71.6 | 40.5 | 51.6 | 62.8 |
| December | 43.7 | 53.8 | 63.7 | 34 | 43.7 | 53.2 |
| Annual Avg | 59.2 | 69.3 | 79.3 | 50.2 | 61 | 71.4 |
Min / mean / max temperature (°F). 🔥 marks each city's hottest month, ❄️ its coldest; shading runs cool blue to warm red.
The same figures plotted out, so the shape of a typical year is easier to see than in a grid. Where the two lines run close together Houston and Marietta feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Houston Marietta
Choose which city to keep, then search for any other city in our database — we'll build the comparison for you.
Quick answers to the questions people ask most when comparing Houston and Marietta — each drawn straight from the climate figures above.
Houston is the warmer of the two. It averages daytime highs of 26.3°C (79.3°F) against 21.9°C (71.4°F) in Marietta — roughly 4.4°C (7.9°F) warmer by day. Nights are milder in Houston, with average lows of 15.1°C (59.2°F) versus 10.1°C (50.2°F).
Houston is hottest in August, averaging highs of about 34.9°C (94.9°F), while Marietta peaks in July at around 32.6°C (90.6°F). That makes Houston the hotter of the two at the height of summer.
Marietta gets colder. In its coldest month (January) overnight lows average about -0.7°C (30.8°F), compared with 4.8°C (40.7°F) at the low point of the year in Houston.
Marietta is the wetter city, collecting about 1,301 mm (51.2 in) of rain a year versus 1,243 mm (48.9 in) in Houston. Houston is wettest in May and driest in February; Marietta is wettest in February and driest in October.
Humidity is similar in both, averaging around 77% in Houston and 76% in Marietta across the year.
The most comfortable months in Houston are April, May and October, when average temperatures are at their mildest.
Marietta is at its most pleasant around May, June and September, based on the mildest average temperatures of the year.
Houston is the warmer city in all 12 months of the year. The gap is widest in January, about 5.8°C (10.4°F), and narrowest in July, about 2.2°C (4°F).
Marietta has the bigger seasonal swing, about 22°C (39.6°F) between its coldest and hottest months versus 18.9°C (34°F) in Houston — so Houston has the steadier, more even climate.
On climate alone, Houston comes out ahead — it offers warmer days and less rain than Marietta. Marietta is the better fit only if you'd actually prefer cooler weather and more rainfall.
Every figure on this page is calculated from NASA POWER satellite climate data spanning 1981–2025 (45 years). The averages describe the long-term climate of Houston and Marietta, not a single year's weather or a short-range forecast.
