Denver is 1.9°C (3.4°F) warmer by day, Seattle has 4.5°C (8.1°F) warmer nights, Seattle gets 793 mm (31.2 in) more rain a year.
Denver is at its warmest in July and coolest in January, while Seattle peaks in August and bottoms out in December. Month for month, Seattle is the warmer of the two in 8 of 12 months.
Seattle is the wetter of the two, collecting 1,255 mm (49.4 in) of rain a year against 462 mm (18.2 in) in Denver. The most comfortable time to visit is June, July and August in Denver and July, August and September in Seattle.
| Denver | Metric | Seattle |
|---|---|---|
| 🌡️ Temperature | ||
| 61.9°F | 🌡️Average daytime high | 58.5°F |
| 35.8°F | 🌙Average nighttime low | 43.9°F |
| July | 🔥Hottest month | August |
| January | ❄️Coldest month | December |
| 🌧️ Rain | ||
| 18.2 in | 🌧️Annual rainfall | 49.4 in |
| May | ☔Wettest month | November |
| January | 🏜️Driest month | July |
| 💨 Climate | ||
| 50% | 💧Average humidity | 83% |
| 2.5 m/s | 💨Average wind speed | 0.7 m/s |
Overnight, Denver typically falls to around 2.1°C (35.8°F) while Seattle settles near 6.6°C (43.9°F).
Denver is hottest in July and coldest in January, whereas Seattle peaks in August and is coolest in December.
Denver sees the most rain in May and the least in January; Seattle is wettest in November and driest in July.
Seattle feels the more humid of the two, averaging 83% relative humidity against 50%.
For Seattle, the pick of the year is July, August 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 | Denver | Seattle | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 19.6 | 30.2❄️ | 40.6 | 35.1 | 40.1 | 45 |
| February | 20.5 | 31.8 | 43.2 | 34.9 | 41 | 47.1 |
| March | 25.3 | 37.9 | 50.7 | 37.8 | 44.8 | 51.6 |
| April | 30.6 | 44.6 | 58.5 | 40.8 | 48.6 | 56.5 |
| May | 40.1 | 54.3 | 68.7 | 46.2 | 54.7 | 63 |
| June | 50.7 | 65.8 | 81.1 | 50.7 | 59.2 | 67.6 |
| July | 57.4 | 71.6🔥 | 85.6 | 55 | 64.2 | 73.2 |
| August | 55.9 | 69.4 | 82.9 | 55.8 | 64.9🔥 | 74.3 |
| September | 47.5 | 61.9 | 76.3 | 51.4 | 60.4 | 69.4 |
| October | 35.4 | 49.5 | 63.3 | 45 | 52.2 | 59.5 |
| November | 26.2 | 38.3 | 50.4 | 38.8 | 44.2 | 49.6 |
| December | 20.1 | 30.6 | 40.8 | 34.3 | 39❄️ | 43.7 |
| Annual Avg | 35.8 | 48.9 | 61.9 | 43.9 | 51.1 | 58.5 |
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 Denver and Seattle feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Denver Seattle
See how Denver and Seattle 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 Denver and Seattle — each drawn straight from the climate figures above.
Denver is the warmer of the two. It averages daytime highs of 16.6°C (61.9°F) against 14.7°C (58.5°F) in Seattle — roughly 1.9°C (3.4°F) warmer by day. Nights are milder in Seattle, with average lows of 6.6°C (43.9°F) versus 2.1°C (35.8°F).
Denver is hottest in July, averaging highs of about 29.8°C (85.6°F), while Seattle peaks in August at around 23.5°C (74.3°F). That makes Denver the hotter of the two at the height of summer.
Denver gets colder. In its coldest month (January) overnight lows average about -6.9°C (19.7°F), compared with 1.3°C (34.4°F) at the low point of the year in Seattle.
Seattle is the wetter city, collecting about 1,255 mm (49.4 in) of rain a year versus 462 mm (18.2 in) in Denver. Denver is wettest in May and driest in January; Seattle is wettest in November and driest in July.
Seattle is the more humid of the two, averaging 83% relative humidity over the year against 50% in Denver.
The most comfortable months in Denver are June, July and August, when average temperatures are at their mildest.
Seattle is at its most pleasant around July, August and September, based on the mildest average temperatures of the year.
Seattle is the warmer city in 8 of the 12 months of the year. The gap is widest in January, about 5.5°C (9.9°F), and narrowest in May, about 0.2°C (0.4°F).
Denver has the bigger seasonal swing, about 23°C (41.4°F) between its coldest and hottest months versus 14.4°C (25.9°F) in Seattle — so Seattle has the steadier, more even climate.
On climate alone, Denver comes out ahead — it offers warmer days, less rain and lower humidity than Seattle. Seattle is the better fit only if you'd actually prefer cooler weather, more rainfall and a more humid climate.
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 Denver and Seattle, not a single year's weather or a short-range forecast.
