Tamil Nadu has a warm subtropical climate with warm summers and mild winters.
Tamil Nadu has an average annual temperature of 28.0°C across all 36 cities, with approximately 1035 mm of annual precipitation and average humidity of 71%. Temperatures peak in April and drop to their lowest in January, while rainfall is highest during autumn months.
The warmest city is Viluppuram with average July highs of 38.4°C, while Krishnagiri is the coldest with average January lows of 12.2°C. Humidity remains moderate throughout the year, especially in autumn, creating warm and humid conditions. These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | 😎 | 31.8°C | 16.6°C | 24.2°C | 75% | 20 | 2.6 | 5.00 |
| February | 😎 | 35.4°C | 17.5°C | 26.4°C | 66% | 13 | 2.4 | 5.90 |
| March | 🥵 | 38.6°C | 19.7°C | 29.2°C | 60% | 18 | 2.3 | 6.40 |
| April | 🥵 | 39.8°C | 23.1°C | 31.5°C | 61% | 43 | 2.4 | 6.30 |
| May | ⛅ | 39.4°C | 24.1°C | 31.7°C | 65% | 81 | 2.9 | 5.90 |
| June | ⛅ | 36.8°C | 23.1°C | 30.0°C | 68% | 85 | 3.7 | 5.40 |
| July | ⛅ | 35.7°C | 22.7°C | 29.2°C | 69% | 87 | 3.7 | 5.10 |
| August | ⛅ | 35.5°C | 22.5°C | 29.0°C | 72% | 99 | 3.3 | 5.30 |
| September | ⛅ | 34.9°C | 22.1°C | 28.5°C | 75% | 125 | 2.6 | 5.40 |
| October | 🌧️ | 33.4°C | 21.1°C | 27.3°C | 80% | 186 | 2.0 | 4.80 |
| November | 🌧️ | 30.8°C | 18.6°C | 24.7°C | 84% | 192 | 2.4 | 4.30 |
| December | ⛅ | 30.2°C | 17.0°C | 23.6°C | 81% | 88 | 2.7 | 4.40 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 36 cities in Tamil Nadu
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot Summer.
☔ Heavy Rainfall expected — carry rain gear and plan outdoor activities around these months.
Region-wide monthly averages across 36 cities · 1981–2025 · °C
Temperatures rise steadily from spring, peak in April, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Region-wide monthly rainfall · 1981–2025 · mm/month
💧 Humidity peaks at 84% in November · annual avg 71%
Monthly averages · 1981–2025
Across 45 years, Tamil Nadu's temperature has remained relatively stable over the past decade. 2019 was the warmest year overall and 1981 the coolest.
The warmest year on record was 2019 (avg: 28.8°C), while the coldest year was 1981 (avg: 27.1°C).
Averaged across all 36 cities in Tamil Nadu · Last 30 years · °C
Averaged across all 36 cities in Tamil Nadu · Last 30 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 36 cities in Tamil Nadu for each year.
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | 21.1°C | 28.1°C | 35.0°C | 1043 | 74% | 2.6 m/s |
2024 | 21.7°C | 28.6°C | 35.5°C | 1207 | 73% | 2.7 m/s |
2023 | 21.3°C | 28.4°C | 35.5°C | 1086 | 72% | 2.6 m/s |
2022 | 20.7°C | 27.5°C | 34.3°C | 1200 | 76% | 2.5 m/s |
2021 🌧️ | 20.7°C | 27.5°C | 34.3°C | 1557 | 77% | 2.5 m/s |
2020 | 21.3°C | 28.1°C | 34.9°C | 1153 | 73% | 2.6 m/s |
2019 | 21.9°C | 28.8°C | 35.7°C | 1034 | 70% | 2.7 m/s |
2018 | 20.7°C | 28.1°C | 35.4°C | 813 | 71% | 2.7 m/s |
2017 | 21.1°C | 28.2°C | 35.3°C | 1031 | 71% | 2.7 m/s |
2016 🔥 | 20.9°C | 28.7°C | 36.5°C | 603 | 68% | 2.7 m/s |
Showing 1 to 10 of 45 years
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
