May is one of the warmer months of the year in Kollam, with average highs near 30.2°C and lows around 24.8°C (mean 27.5°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 May in Kollam was 1991 — when the month averaged 29.4°C — while the coldest was 1999 at 26°C. Typical May days reach 30.2°C with nights near 24.8°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Kollam, averaging 226 mm of rainfall. The wettest May on record was 2004 with 685 mm, while the driest was 1996 at 18 mm.
Relative humidity in Kollam during May averages 82%. The most humid May was 2004 at 90%, and the least humid was 1991 at 72%.
May receives about 5.1 kWh/m²/day of solar energy in Kollam. The sunniest May was 2019 at 5.9 kWh/m²/day, and the cloudiest was 2024 at 4.
Average wind speed in Kollam during May is 1.9 m/s. The windiest May was 1989 at 2.3 m/s, while the calmest were 1982 and 1987 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 27.4°C | 27.7°C | 27.2°C | 27.7°C | 27.5°C | +0.1°C |
| Avg High | 30.3°C | 30.7°C | 29.7°C | 30.3°C | 29.9°C | -0.4°C |
| Avg Low | 24.5°C | 24.8°C | 24.7°C | 25.0°C | 25.0°C | +0.5°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 0.1°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 January and December tend to be the most comfortable for visiting Kollam. That said, May — with days averaging 30.2°C and nights around 24.8°C (mean 27.5°C) and higher rainfall (226 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.7°C | 27.5°C | 25.4°C | 31.6°C | 24.1°C | 347 mm | 86% | 2.1 m/s | 4.8 |
| 2024 | 31.2°C | 28.5°C | 25.8°C | 36.1°C | 24.4°C | 439 mm | 82% | 1.8 m/s | 4 |
| 2023 | 30.7°C | 27.8°C | 24.9°C | 32.5°C | 23.4°C | 178 mm | 83% | 1.5 m/s | 5.7 |
| 2022 | 28.8°C | 26.6°C | 24.5°C | 31.2°C | 22.9°C | 256 mm | 88% | 1.9 m/s | 4.7 |
| 2021 | 28.8°C | 26.6°C | 24.3°C | 31.6°C | 23.2°C | 647 mm | 89% | 1.6 m/s | 4.8 |
| 2020 | 30.4°C | 27.9°C | 25.4°C | 35.2°C | 24.0°C | 322 mm | 84% | 1.6 m/s | 5.1 |
| 2019 | 32.0°C | 28.8°C | 25.7°C | 35.2°C | 24.6°C | 84 mm | 78% | 1.9 m/s | 5.9 |
| 2018 | 30.2°C | 27.6°C | 24.9°C | 35.0°C | 24.0°C | 188 mm | 83% | 1.8 m/s | 4.6 |
| 2017 | 30.7°C | 27.9°C | 25.1°C | 33.8°C | 24.0°C | 208 mm | 82% | 1.8 m/s | 5.2 |
| 2016 | 30.6°C | 27.9°C | 25.2°C | 34.6°C | 23.6°C | 283 mm | 83% | 1.7 m/s | 4.8 |
| 2015 | 29.3°C | 27.0°C | 24.7°C | 31.2°C | 23.1°C | 286 mm | 87% | 1.5 m/s | 4.6 |
| 2014 | 29.6°C | 27.2°C | 24.8°C | 32.7°C | 23.2°C | 238 mm | 86% | 1.7 m/s | 5.4 |
| 2013 | 30.2°C | 27.7°C | 25.1°C | 32.9°C | 23.7°C | 155 mm | 80% | 2.1 m/s | 5 |
| 2012 | 29.5°C | 27.0°C | 24.6°C | 32.0°C | 22.5°C | 104 mm | 84% | 2 m/s | 5.7 |
| 2011 | 30.8°C | 27.7°C | 24.6°C | 34.1°C | 22.8°C | 104 mm | 79% | 2 m/s | 5.5 |
| 2010 | 30.3°C | 27.8°C | 25.4°C | 32.6°C | 23.7°C | 187 mm | 84% | 1.9 m/s | 4.8 |
| 2009 | 30.0°C | 27.5°C | 25.0°C | 33.4°C | 23.4°C | 251 mm | 82% | 2 m/s | 5.3 |
| 2008 | 28.8°C | 26.6°C | 24.3°C | 30.1°C | 23.6°C | 138 mm | 86% | 1.8 m/s | 5.7 |
| 2007 | 30.4°C | 27.5°C | 24.7°C | 33.2°C | 22.5°C | 199 mm | 82% | 1.9 m/s | 5.6 |
| 2006 | 30.0°C | 27.4°C | 24.9°C | 33.7°C | 23.5°C | 371 mm | 81% | 2 m/s | 4.9 |
| 2005 | 30.3°C | 27.5°C | 24.7°C | 32.3°C | 23.3°C | 196 mm | 84% | 1.6 m/s | 5.5 |
| 2004 🌧️ | 28.2°C | 26.3°C | 24.4°C | 33.7°C | 23.3°C | 685 mm | 90% | 2.1 m/s | 4.9 |
| 2003 | 30.1°C | 27.6°C | 25.1°C | 31.7°C | 23.5°C | 143 mm | 84% | 2 m/s | 5.6 |
| 2002 | 29.9°C | 27.4°C | 25.0°C | 37.0°C | 24.1°C | 296 mm | 84% | 2.1 m/s | 5.1 |
| 2001 | 28.9°C | 26.7°C | 24.5°C | 30.4°C | 23.1°C | 220 mm | 87% | 1.8 m/s | 5.3 |
| 2000 | 30.5°C | 27.6°C | 24.7°C | 33.7°C | 23.1°C | 57 mm | 79% | 2.1 m/s | 5.8 |
| 1999 ❄️ | 28.1°C | 26.0°C | 23.9°C | 33.2°C | 23.1°C | 353 mm | 87% | 2.1 m/s | 4.8 |
| 1998 | 31.4°C | 28.5°C | 25.5°C | 37.2°C | 24.5°C | 283 mm | 81% | 1.6 m/s | 5.1 |
| 1997 | 30.6°C | 27.6°C | 24.6°C | 34.7°C | 22.9°C | 102 mm | 79% | 1.8 m/s | 5 |
| 1996 | 32.0°C | 28.5°C | 25.0°C | 33.9°C | 24.2°C | 18 mm | 75% | 2.1 m/s | 5.5 |
| 1995 | 28.8°C | 26.5°C | 24.2°C | 33.4°C | 22.3°C | 393 mm | 86% | 1.9 m/s | 4.8 |
| 1994 | 31.0°C | 27.9°C | 24.9°C | 34.8°C | 23.9°C | 194 mm | 78% | 2.1 m/s | 4.7 |
| 1993 | 30.8°C | 27.8°C | 24.8°C | 33.7°C | 23.5°C | 154 mm | 79% | 1.8 m/s | 4.8 |
| 1992 | 31.0°C | 27.7°C | 24.5°C | 34.8°C | 23.3°C | 161 mm | 80% | 1.8 m/s | 4.9 |
| 1991 🔥 | 32.9°C | 29.4°C | 25.9°C | 37.1°C | 24.4°C | 40 mm | 72% | 1.8 m/s | 4.9 |
| 1990 | 30.0°C | 27.3°C | 24.7°C | 34.0°C | 23.3°C | 296 mm | 81% | 2.2 m/s | 4.3 |
| 1989 | 30.0°C | 27.3°C | 24.6°C | 34.2°C | 23.3°C | 181 mm | 80% | 2.3 m/s | 4.6 |
| 1988 | 30.3°C | 27.7°C | 25.0°C | 32.6°C | 23.9°C | 54 mm | 81% | 2.1 m/s | 4.7 |
| 1987 | 32.1°C | 28.5°C | 24.8°C | 35.9°C | 23.8°C | 171 mm | 76% | 1.4 m/s | 5.5 |
| 1986 | 29.5°C | 26.8°C | 24.2°C | 32.2°C | 22.6°C | 173 mm | 83% | 1.9 m/s | 5.2 |
| 1985 | 30.8°C | 27.7°C | 24.7°C | 36.4°C | 23.5°C | 271 mm | 78% | 2.1 m/s | 4.7 |
| 1984 | 29.6°C | 26.9°C | 24.2°C | 31.9°C | 23.6°C | 130 mm | 85% | 1.8 m/s | 5.2 |
| 1983 | 31.4°C | 28.2°C | 25.0°C | 34.1°C | 24.0°C | 61 mm | 77% | 1.8 m/s | — |
| 1982 | 29.2°C | 26.6°C | 24.0°C | 31.1°C | 23.0°C | 309 mm | 86% | 1.4 m/s | — |
| 1981 | 29.6°C | 27.0°C | 24.4°C | 32.4°C | 23.0°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 30.2°C with lows near 24.8°C (mean 27.5°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 risen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from 24.5°C to 25°C while daytime highs eased from 30.1°C to 29.8°C, narrowing the gap between day and night.
May is one of the warmer months of the year in Kollam and a relatively wet time of year, so plan for around 30.2°C daytime highs and 24.8°C at night.
Not quite — May is the 10th coolest month in Kollam, averaging 27.5°C.
For May in Kollam, pack light, breathable clothing and sun protection, with typical highs of 30.2°C and lows of 24.8°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.
