May is one of the warmer months of the year in Kollam, with average highs near 33.5°C and lows around 23.5°C (mean 28.5°C). It is a relatively wet time of year, averaging 226 mm of rainfall and 82% relative humidity across the period.
May is one of the warmer months of the year in Kollam. Across 45 years of records, the warmest Mays in Kollam were 1991 and 1998 — when the month averaged 30.8°C — while the coldest were 2001 and 2008 at 26.8°C. Typical May days reach 33.5°C with nights near 23.5°C. The long-term May temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.4°C | 29.1°C | 28.1°C | 28.5°C | 28.4°C | 0°C |
| Avg High | 33.4°C | 34.7°C | 32.9°C | 33.4°C | 33.0°C | -0.4°C |
| Avg Low | 23.4°C | 23.5°C | 23.3°C | 23.5°C | 23.7°C | +0.3°C |
| Avg Rain | 179 mm | 199 mm | 256 mm | 184 mm | 365 mm | +186 mm |
May temperatures in Kollam have stayed relatively stable across the record.
May has ranged from a record low of 22.3°C (1995) to a record high of 37.2°C (1998).
Rainfall in May is a relatively wet time of year, averaging 226 mm, with a wettest year of 685 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A quieter season to visit Kollam
If your dates are flexible, the more temperate months of December and January tend to be the most comfortable for visiting Kollam. That said, May — with days averaging 33.5°C and nights around 23.5°C (mean 28.5°C) and higher rainfall (226 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 31.6°C | 24.1°C | 27.9°C | 347 mm | 86% | 2.1 m/s | 4.8 |
| 2024 | 36.1°C | 24.4°C | 30.3°C | 439 mm | 82% | 1.8 m/s | 4 |
| 2023 | 32.5°C | 23.4°C | 28.0°C | 178 mm | 83% | 1.5 m/s | 5.7 |
| 2022 | 31.2°C | 22.9°C | 27.1°C | 256 mm | 88% | 1.9 m/s | 4.7 |
| 2021 | 31.6°C | 23.2°C | 27.4°C | 647 mm | 89% | 1.6 m/s | 4.8 |
| 2020 | 35.2°C | 24.0°C | 29.6°C | 322 mm | 84% | 1.6 m/s | 5.1 |
| 2019 | 35.2°C | 24.6°C | 29.9°C | 84 mm | 78% | 1.9 m/s | 5.9 |
| 2018 | 35.0°C | 24.0°C | 29.5°C | 188 mm | 83% | 1.8 m/s | 4.6 |
| 2017 | 33.8°C | 24.0°C | 28.9°C | 208 mm | 82% | 1.8 m/s | 5.2 |
| 2016 | 34.6°C | 23.6°C | 29.1°C | 283 mm | 83% | 1.7 m/s | 4.8 |
| 2015 | 31.2°C | 23.1°C | 27.2°C | 286 mm | 87% | 1.5 m/s | 4.6 |
| 2014 | 32.7°C | 23.2°C | 27.9°C | 238 mm | 86% | 1.7 m/s | 5.4 |
| 2013 | 32.9°C | 23.7°C | 28.3°C | 155 mm | 80% | 2.1 m/s | 5 |
| 2012 | 32.0°C | 22.5°C | 27.2°C | 104 mm | 84% | 2 m/s | 5.7 |
| 2011 | 34.1°C | 22.8°C | 28.4°C | 104 mm | 79% | 2 m/s | 5.5 |
| 2010 | 32.6°C | 23.7°C | 28.2°C | 187 mm | 84% | 1.9 m/s | 4.8 |
| 2009 | 33.4°C | 23.4°C | 28.4°C | 251 mm | 82% | 2 m/s | 5.3 |
| 2008 | 30.1°C | 23.6°C | 26.8°C | 138 mm | 86% | 1.8 m/s | 5.7 |
| 2007 | 33.2°C | 22.5°C | 27.9°C | 199 mm | 82% | 1.9 m/s | 5.6 |
| 2006 | 33.7°C | 23.5°C | 28.6°C | 371 mm | 81% | 2 m/s | 4.9 |
| 2005 | 32.3°C | 23.3°C | 27.8°C | 196 mm | 84% | 1.6 m/s | 5.5 |
| 2004 🌧️ | 33.7°C | 23.3°C | 28.5°C | 685 mm | 90% | 2.1 m/s | 4.9 |
| 2003 | 31.7°C | 23.5°C | 27.6°C | 143 mm | 84% | 2 m/s | 5.6 |
| 2002 | 37.0°C | 24.1°C | 30.6°C | 296 mm | 84% | 2.1 m/s | 5.1 |
| 2001 ❄️ | 30.4°C | 23.1°C | 26.8°C | 220 mm | 87% | 1.8 m/s | 5.3 |
| 2000 | 33.7°C | 23.1°C | 28.4°C | 57 mm | 79% | 2.1 m/s | 5.8 |
| 1999 | 33.2°C | 23.1°C | 28.1°C | 353 mm | 87% | 2.1 m/s | 4.8 |
| 1998 | 37.2°C | 24.5°C | 30.8°C | 283 mm | 81% | 1.6 m/s | 5.1 |
| 1997 | 34.7°C | 22.9°C | 28.8°C | 102 mm | 79% | 1.8 m/s | 5 |
| 1996 | 33.9°C | 24.2°C | 29.0°C | 18 mm | 75% | 2.1 m/s | 5.5 |
| 1995 | 33.4°C | 22.3°C | 27.9°C | 393 mm | 86% | 1.9 m/s | 4.8 |
| 1994 | 34.8°C | 23.9°C | 29.3°C | 194 mm | 78% | 2.1 m/s | 4.7 |
| 1993 | 33.7°C | 23.5°C | 28.6°C | 154 mm | 79% | 1.8 m/s | 4.8 |
| 1992 | 34.8°C | 23.3°C | 29.0°C | 161 mm | 80% | 1.8 m/s | 4.9 |
| 1991 🔥 | 37.1°C | 24.4°C | 30.8°C | 40 mm | 72% | 1.8 m/s | 4.9 |
| 1990 | 34.0°C | 23.3°C | 28.6°C | 296 mm | 81% | 2.2 m/s | 4.3 |
| 1989 | 34.2°C | 23.3°C | 28.8°C | 181 mm | 80% | 2.3 m/s | 4.6 |
| 1988 | 32.6°C | 23.9°C | 28.2°C | 54 mm | 81% | 2.1 m/s | 4.7 |
| 1987 | 35.9°C | 23.8°C | 29.8°C | 171 mm | 76% | 1.4 m/s | 5.5 |
| 1986 | 32.2°C | 22.6°C | 27.4°C | 173 mm | 83% | 1.9 m/s | 5.2 |
| 1985 | 36.4°C | 23.5°C | 29.9°C | 271 mm | 78% | 2.1 m/s | 4.7 |
| 1984 | 31.9°C | 23.6°C | 27.7°C | 130 mm | 85% | 1.8 m/s | 5.2 |
| 1983 | 34.1°C | 24.0°C | 29.0°C | 61 mm | 77% | 1.8 m/s | — |
| 1982 | 31.1°C | 23.0°C | 27.1°C | 309 mm | 86% | 1.4 m/s | — |
| 1981 | 32.4°C | 23.0°C | 27.7°C | 261 mm | 83% | 1.7 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 33.5°C with lows near 23.5°C (mean 28.5°C), based on 45 years of NASA POWER data.
May averages 226 mm of rainfall in Kollam, a relatively wet time of year. The wettest on record was 685 mm in 2004.
The hottest May reached 37.2°C in 1998. The coldest dipped to 22.3°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 0.2°C. Daytime highs moved from 33.2°C to 32.6°C and overnight lows from 23.4°C to 23.6°C over the same span.
May is one of the warmer months of the year in Kollam and a relatively wet time of year, so plan for around 33.5°C daytime highs and 23.5°C at night.
Not quite — May is the 10th coolest month in Kollam, averaging 28.5°C.
For May in Kollam, pack light, breathable clothing and sun protection, with typical highs of 33.5°C and lows of 23.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 82% — quite humid.
Average wind speed in May is 1.9 m/s. The windiest May on record averaged 2.3 m/s (1989).
The wettest May on record was 2004 with 685 mm. On average, May sees 226 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Kollam behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
