Hamilton is 3.8°C (6.8°F) warmer by day, Mississauga has 4.3°C (7.7°F) warmer nights, and both get similar annual rainfall.
Hamilton is at its warmest in July and coolest in January, while Mississauga peaks in July and bottoms out in January. Month for month, Hamilton is the warmer of the two in 6 of 11 months.
Both collect a similar amount of rain over the year — 718 mm (28.3 in) in Hamilton and 685 mm (27 in) in Mississauga. The most comfortable time to visit is June, July and August in Hamilton and June, July and August in Mississauga.
| Hamilton | Metric | Mississauga |
|---|---|---|
| 🌡️ Temperature | ||
| 21.8°C | 🌡️Average daytime high | 18°C |
| -4.8°C | 🌙Average nighttime low | -0.5°C |
| July | 🔥Hottest month | July |
| January | ❄️Coldest month | January |
| 🌧️ Rain | ||
| 718 mm | 🌧️Annual rainfall | 685 mm |
| July | ☔Wettest month | July |
| February | 🏜️Driest month | February |
| 💨 Climate | ||
| 77% | 💧Average humidity | 78% |
| 3.3 m/s | 💨Average wind speed | 4.1 m/s |
Overnight, Hamilton typically falls to around -4.8°C (23.4°F) while Mississauga settles near -0.5°C (31.1°F).
Hamilton is hottest in July and coldest in January, whereas Mississauga peaks in July and is coolest in January.
Hamilton sees the most rain in July and the least in February; Mississauga is wettest in July and driest in February.
Mississauga feels the more humid of the two, averaging 78% relative humidity against 77%.
For Mississauga, the pick of the year is June, July and August.
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 | Hamilton | Mississauga | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | -20.5 | -7.1❄️ | 6.2 | -13.9 | -3.7❄️ | 6.5 |
| February | -19.6 | -5.9 | 7.8 | -13.4 | -3.3 | 6.8 |
| March | -15.2 | 0.8 | 16.9 | -10.3 | 0.8 | 12 |
| April | -6 | 8.3 | 22.7 | -3.1 | 6.7 | 16.4 |
| May | -0.3 | 13.9 | 28.1 | 2.3 | 12.5 | 22.6 |
| June | 5.5 | 18.7 | 31.9 | 7.8 | 17.2 | 26.5 |
| July | 10.2 | 22🔥 | 33.8 | 13 | 20.7🔥 | 28.5 |
| August | 9.6 | 21.4 | 33.2 | 13.3 | 20.6 | 28 |
| September | 4.1 | 17.5 | 30.9 | 8.5 | 17.1 | 25.7 |
| October | -2.4 | 11.3 | 24.9 | 2.5 | 11.4 | 20.3 |
| November | -7.7 | 4.6 | 16.9 | -3.3 | 5.4 | 14 |
| December | -14.7 | -3 | 8.8 | -9.2 | -0.3 | 8.6 |
| Annual Avg | -4.7 | 8.5 | 21.8 | -0.5 | 8.8 | 18 |
Min / mean / max temperature (°C). 🔥 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 Hamilton and Mississauga feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Hamilton Mississauga
See how Hamilton and Mississauga 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 Hamilton and Mississauga — each drawn straight from the climate figures above.
Hamilton is the warmer of the two. It averages daytime highs of 21.8°C (71.2°F) against 18°C (64.4°F) in Mississauga — roughly 3.8°C (6.8°F) warmer by day. Nights are milder in Mississauga, with average lows of -0.5°C (31.1°F) versus -4.8°C (23.4°F).
Hamilton is hottest in July, averaging highs of about 33.8°C (92.8°F), while Mississauga peaks in July at around 28.5°C (83.2°F). That makes Hamilton the hotter of the two at the height of summer.
Hamilton gets colder. In its coldest month (January) overnight lows average about -20.5°C (-4.9°F), compared with -13.9°C (7°F) at the low point of the year in Mississauga.
They get a similar amount of rain over a year — about 718 mm (28.3 in) in Hamilton and 685 mm (27 in) in Mississauga. Hamilton is wettest in July and driest in February; Mississauga is wettest in July and driest in February.
Humidity is similar in both, averaging around 77% in Hamilton and 78% in Mississauga across the year.
The most comfortable months in Hamilton are June, July and August, when average temperatures are at their mildest.
Mississauga is at its most pleasant around June, July and August, based on the mildest average temperatures of the year.
Hamilton is the warmer city in 6 of the 11 months of the year. The gap is widest in January, about 3.4°C (6.1°F), and narrowest in March, about 0°C (0°F).
Hamilton has the bigger seasonal swing, about 29.1°C (52.4°F) between its coldest and hottest months versus 24.4°C (43.9°F) in Mississauga — so Mississauga has the steadier, more even climate.
On climate alone, Hamilton comes out ahead — it offers warmer days than Mississauga. Mississauga is the better fit only if you'd actually prefer cooler weather.
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 Hamilton and Mississauga, not a single year's weather or a short-range forecast.
