Climate averages 1991–2020
Idaiyarpālaiyam weather
by month.
See how the year changes. April has the highest average daily maximum; January has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: December
Long-term climate patterns, not a forecast for a particular trip.
Across the year Idaiyarpālaiyam averages a daytime high of 29.7°C and a nighttime low of 21.0°C, with about 889 mm of rain on roughly 139 days. April is the warmest month (average high 34.2°C) and November (tied with December) the coolest (27.3°C). October is the wettest month with 167 mm; January is the driest with 8.4 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): December. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Idaiyarpālaiyam
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Idaiyarpālaiyam climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C18.0°C | 18.0°C | 8.4 | 2.2 | 11.612 h |
| February | 31.6°C19.3°C | 19.3°C | 12 | 2.4 | 11.812 h |
| March | 34.0°C21.5°C | 21.5°C | 21 | 4.1 | 12.112 h |
| April | 34.2°C23.4°C | 23.4°C | 40 | 9.3 | 12.412 h |
| May | 32.2°C23.5°C | 23.5°C | 70 | 14.9 | 12.613 h |
| June | 28.5°C22.2°C | 22.2°C | 101 | 14.8 | 12.813 h |
| July | 27.6°C21.5°C | 21.5°C | 106 | 15.3 | 12.713 h |
| August | 27.7°C21.4°C | 21.4°C | 97 | 15.1 | 12.512 h |
| September | 28.4°C21.6°C | 21.6°C | 84 | 16.0 | 12.212 h |
| October | 28.0°C21.2°C | 21.2°C | 167 | 21.3 | 11.912 h |
| November | 27.3°C20.1°C | 20.1°C | 132 | 15.9 | 11.612 h |
| December | 27.3°C18.5°C | 18.5°C | 50 | 7.2 | 11.511 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- CoimbatoreIndia · 6 kmHigh 30.3°C · Low 21.3°C · 889 mm rain a year
- PalakkadIndia · 42 kmHigh 31.3°C · Low 23.0°C · 1,139 mm rain a year
- PollachiIndia · 43 kmHigh 30.1°C · Low 21.7°C · 970 mm rain a year
- VelampālaiyamIndia · 44 kmHigh 31.8°C · Low 22.2°C · 1,157 mm rain a year
- TiruppurIndia · 48 kmHigh 32.2°C · Low 22.6°C · 894 mm rain a year
- OotyIndia · 48 kmHigh 20.4°C · Low 12.6°C · 1,454 mm rain a year
- DharapuramIndia · 74 kmHigh 31.7°C · Low 22.3°C · 684 mm rain a year
- ValparaiIndia · 79 kmHigh 25.1°C · Low 18.0°C · 3,593 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+5:30, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 11.00°, 76.90° (5 km from the city centre), adjusted up by 0.7°C for the difference between the city's elevation (455 m) and the cell's (561 m). Rain comes from the 0.25° cell at 11.00°, 77.00°. Coimbatore lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.