Chennai is 17.9°C (32.2°F) warmer by day, Chennai has 18.3°C (32.9°F) warmer nights, Chennai gets 539 mm (21.2 in) more rain a year.
Chennai is at its warmest in May and coolest in January, while London peaks in July and bottoms out in February. Month for month, Chennai is the warmer of the two in 12 of 12 months.
Chennai is the wetter of the two, collecting 1,244 mm (49 in) of rain a year against 705 mm (27.8 in) in London. The most comfortable time to visit is January, November and December in Chennai and June, July and August in London.
| Chennai | Metric | London |
|---|---|---|
| 🌡️ Temperature | ||
| 32.2°C | 🌡️Average daytime high | 14.3°C |
| 24.5°C | 🌙Average nighttime low | 6.2°C |
| May | 🔥Hottest month | July |
| January | ❄️Coldest month | February |
| 🌧️ Rain | ||
| 1,244 mm | 🌧️Annual rainfall | 705 mm |
| November | ☔Wettest month | October |
| March | 🏜️Driest month | April |
| 💨 Climate | ||
| 72% | 💧Average humidity | 85% |
| 3.2 m/s | 💨Average wind speed | 3.4 m/s |
Overnight, Chennai typically falls to around 24.5°C (76.1°F) while London settles near 6.2°C (43.2°F).
Chennai is hottest in May and coldest in January, whereas London peaks in July and is coolest in February.
Chennai sees the most rain in November and the least in March; London is wettest in October and driest in April.
London feels the more humid of the two, averaging 85% relative humidity against 72%.
For London, 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 | Chennai | London | ||||
|---|---|---|---|---|---|---|
| Min | Avg | Max | Min | Avg | Max | |
| January | 21 | 24.5❄️ | 28.1 | 1.3 | 4❄️ | 6.7 |
| February | 21.7 | 26.3 | 30.9 | 1.2 | 4.4 | 7.5 |
| March | 23.7 | 29.1 | 34.5 | 2.5 | 6.5 | 10.4 |
| April | 26.3 | 31.4 | 36.4 | 4 | 8.7 | 13.3 |
| May | 27.8 | 32.2🔥 | 36.6 | 7.1 | 11.9 | 16.7 |
| June | 26.8 | 30.8 | 34.9 | 10 | 14.9 | 19.9 |
| July | 25.9 | 29.9 | 33.9 | 12.3 | 17.4🔥 | 22.4 |
| August | 25.5 | 29.3 | 33.1 | 12.3 | 17.3 | 22.4 |
| September | 25.3 | 28.6 | 31.9 | 10.1 | 14.8 | 19.5 |
| October | 24.9 | 27.6 | 30.4 | 7.5 | 11.3 | 15.1 |
| November | 23.6 | 26 | 28.5 | 4.3 | 7.2 | 10.2 |
| December | 21.9 | 24.7 | 27.5 | 2.4 | 4.9 | 7.3 |
| Annual Avg | 24.5 | 28.4 | 32.2 | 6.3 | 10.3 | 14.3 |
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 Chennai and London feel alike; where they separate, they are genuinely different places to be.
Hover or tap any point to read the exact figures. Chennai London
See how Chennai and London 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 Chennai and London — each drawn straight from the climate figures above.
Chennai is the warmer of the two. It averages daytime highs of 32.2°C (90°F) against 14.3°C (57.7°F) in London — roughly 17.9°C (32.2°F) warmer by day. Nights are milder in Chennai, with average lows of 24.5°C (76.1°F) versus 6.2°C (43.2°F).
Chennai is hottest in May, averaging highs of about 36.6°C (97.8°F), while London peaks in July at around 22.4°C (72.4°F). That makes Chennai the hotter of the two at the height of summer.
London gets colder. In its coldest month (February) overnight lows average about 1.2°C (34.2°F), compared with 21°C (69.8°F) at the low point of the year in Chennai.
Chennai is the wetter city, collecting about 1,244 mm (49 in) of rain a year versus 705 mm (27.8 in) in London. Chennai is wettest in November and driest in March; London is wettest in October and driest in April.
London is the more humid of the two, averaging 85% relative humidity over the year against 72% in Chennai.
The most comfortable months in Chennai are January, November and December, when average temperatures are at their mildest.
London is at its most pleasant around June, July and August, based on the mildest average temperatures of the year.
Chennai is the warmer city in all 12 months of the year. The gap is widest in April, about 22.7°C (40.9°F), and narrowest in August, about 12°C (21.6°F).
London has the bigger seasonal swing, about 13.4°C (24.1°F) between its coldest and hottest months versus 7.7°C (13.9°F) in Chennai — so Chennai has the steadier, more even climate.
It depends what matters most to you: choose Chennai for warmer weather, pick London if you prefer drier conditions and go for Chennai 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 Chennai and London, not a single year's weather or a short-range forecast.
