Climate averages 1991–2020
Kollam weather
in September.
A hot, very wet month: the joint 9th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Kollam: daytime highs average 28.1°C and nights cool to about 24.3°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 245 mm of rain on roughly 27 days, which makes September a very wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average September day.
The nearest other city in this atlas is Thiruvananthapuram (60 km away). In September its highs average 27.5°C, 0.6°C cooler than Kollam, with 172 mm of rain.
Among the 692 cities listed in India, Kollam ranks joint 620th of 692 for the warmest September highs and joint 621st of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Kollam is 2.6°C cooler than that mean.
From September to October, average highs rise by 0.3°C to 28.4°C, and monthly rainfall rises from 245 mm to 251 mm.
The annual picture
September in context
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
Kollam climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.9°C23.5°C | 23.5°C | 20 | 4.2 | 11.712 h |
| February | 31.7°C24.0°C | 24.0°C | 25 | 6.6 | 11.812 h |
| March | 32.0°C25.0°C | 25.0°C | 67 | 16.4 | 12.112 h |
| April | 31.2°C25.7°C | 25.7°C | 156 | 26.5 | 12.312 h |
| May | 29.9°C25.7°C | 25.7°C | 302 | 28.4 | 12.513 h |
| June | 28.1°C24.8°C | 24.8°C | 414 | 29.9 | 12.613 h |
| July | 27.6°C24.3°C | 24.3°C | 355 | 30.0 | 12.613 h |
| August | 27.6°C24.2°C | 24.2°C | 286 | 28.9 | 12.412 h |
| September, selected | 28.1°C24.3°C | 24.3°C | 245 | 26.6 | 12.212 h |
| October | 28.4°C24.2°C | 24.2°C | 251 | 27.1 | 11.912 h |
| November | 28.8°C24.1°C | 24.1°C | 178 | 20.7 | 11.712 h |
| December | 29.7°C23.7°C | 23.7°C | 64 | 8.7 | 11.612 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
September in nearby cities
- Thiruvananthapuram in SeptemberIndia · 60 kmHigh 27.5°C · Low 23.9°C · 172 mm rain
- Alappuzha in SeptemberIndia · 73 kmHigh 28.2°C · Low 24.1°C · 231 mm rain
- Neyyāttinkara in SeptemberIndia · 77 kmHigh 27.8°C · Low 24.1°C · 172 mm rain
- Thenkasi in SeptemberIndia · 81 kmHigh 30.3°C · Low 22.2°C · 135 mm rain
- Kadayanallur in SeptemberIndia · 86 kmHigh 30.8°C · Low 22.6°C · 135 mm rain
- Nāgercoil in SeptemberIndia · 122 kmHigh 29.6°C · Low 24.4°C · 62 mm rain
- Tirunelveli in SeptemberIndia · 122 kmHigh 34.7°C · Low 24.6°C · 50 mm rain
- Rajapalayam in SeptemberIndia · 124 kmHigh 34.2°C · Low 23.4°C · 126 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Kollam) is explained once on the Kollam year overview and on the Sources, method and limits page.