Miami is 12.4°C (22.3°F) warmer by day, Miami has 19.6°C (35.3°F) warmer nights, Miami gets 161 mm (6.3 in) more rain a year.
Boston is at its warmest in July and coolest in January, while Miami peaks in August and bottoms out in January. Month for month, Miami is the warmer of the two in 12 of 12 months.
Miami is the wetter of the two, collecting 1,374 mm (54.1 in) of rain a year against 1,213 mm (47.8 in) in Boston. The most comfortable time to visit is June, July and August in Boston and January, February and December in Miami.
| Boston | Metric | Miami |
|---|---|---|
| 🌡️ Temperature | ||
| 57.4°F | 🌡️Average daytime high | 79.7°F |
| 40.1°F | 🌙Average nighttime low | 75.4°F |
| July | 🔥Hottest month | August |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 47.8 in | 🌧️Annual rainfall | 54.1 in |
| October | ☔Wettest month | June |
| February | 🏜️Driest month | February |
| 💨 Climate | ||
| 80% | 💧Average humidity | 76% |
| 0.7 m/s | 💨Average wind speed | 4.3 m/s |
Overnight, Boston typically falls to around 4.5°C (40.1°F) while Miami settles near 24.1°C (75.4°F).
Boston is hottest in July and coldest in January, whereas Miami peaks in August and is coolest in January.
Boston sees the most rain in October and the least in February; Miami is wettest in June and driest in February.
Boston feels the more humid of the two, averaging 80% relative humidity against 76%.
For Miami, the pick of the year is January, February and December.
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 | Boston | Miami | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 17.8 | 25❄️ | 32.4 | 67.3 | 70❄️ | 72.9 |
| February | 19.4 | 27.1 | 34.9 | 68.9 | 71.6 | 74.3 |
| March | 26.4 | 34.7 | 43 | 70.3 | 73 | 75.9 |
| April | 35.8 | 45.1 | 54.5 | 73.4 | 75.9 | 78.4 |
| May | 46.4 | 55.9 | 65.5 | 77.2 | 79.2 | 81.3 |
| June | 55.9 | 65.1 | 74.3 | 80.4 | 82 | 83.8 |
| July | 62.4 | 71.8🔥 | 81.1 | 82 | 83.5 | 85.1 |
| August | 61.3 | 71.1 | 80.8 | 82.4 | 84🔥 | 85.6 |
| September | 54.1 | 64 | 73.8 | 81.3 | 82.9 | 84.4 |
| October | 43.7 | 52.5 | 61.5 | 78.4 | 80.1 | 81.9 |
| November | 33.8 | 41.5 | 49.3 | 73.9 | 75.9 | 78.1 |
| December | 24.8 | 31.5 | 38.1 | 70.2 | 72.5 | 74.8 |
| Annual Avg | 40.1 | 48.7 | 57.4 | 75.6 | 77.5 | 79.7 |
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 Boston and Miami feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Boston Miami
See how Boston and Miami stack up against other cities. Swipe for more.
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 Boston and Miami — each drawn straight from the climate figures above.
Miami is the warmer of the two. It averages daytime highs of 26.5°C (79.7°F) against 14.1°C (57.4°F) in Boston — roughly 12.4°C (22.3°F) warmer by day. Nights are milder in Miami, with average lows of 24.1°C (75.4°F) versus 4.5°C (40.1°F).
Boston is hottest in July, averaging highs of about 27.3°C (81.1°F), while Miami peaks in August at around 29.8°C (85.6°F). That makes Miami the hotter of the two at the height of summer.
Boston gets colder. In its coldest month (January) overnight lows average about -7.9°C (17.7°F), compared with 19.6°C (67.2°F) at the low point of the year in Miami.
Miami is the wetter city, collecting about 1,374 mm (54.1 in) of rain a year versus 1,213 mm (47.8 in) in Boston. Boston is wettest in October and driest in February; Miami is wettest in June and driest in February.
Boston is the more humid of the two, averaging 80% relative humidity over the year against 76% in Miami.
The most comfortable months in Boston are June, July and August, when average temperatures are at their mildest.
Miami is at its most pleasant around January, February and December, based on the mildest average temperatures of the year.
Miami is the warmer city in all 12 months of the year. The gap is widest in January, about 25°C (45°F), and narrowest in July, about 6.5°C (11.7°F).
Boston has the bigger seasonal swing, about 26°C (46.8°F) between its coldest and hottest months versus 7.8°C (14°F) in Miami — so Miami has the steadier, more even climate.
It depends what matters most to you: choose Miami for warmer weather, pick Boston if you prefer drier conditions and go for Miami if you want lower humidity. There is no single "better" climate — it comes down to whether you value warmth, dryness or comfort most.
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 Boston and Miami, not a single year's weather or a short-range forecast.
