May is one of the warmer months of the year in West Siang, with average highs near 29°C and lows around 18.6°C (mean 23.8°C). It is a relatively wet time of year, averaging 285 mm of rainfall and 74% relative humidity across the period.
May is one of the warmer months of the year in West Siang. Across 45 years of records, the warmest May in West Siang was 1998 — when the month averaged 25.7°C — while the coldest were 2005 and 2023 at 22.5°C. Typical May days reach 29°C with nights near 18.6°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in West Siang, averaging 285 mm of rainfall. The wettest May on record was 2004 with 662 mm, while the driest was 1991 at 69 mm.
Relative humidity in West Siang during May averages 74%. The most humid May was 2010 at 82%, and the least humid was 1986 at 64%.
May receives about 3.9 kWh/m²/day of solar energy in West Siang. The sunniest May was 1995 at 5.1 kWh/m²/day, and the cloudiest were 2019 and 2021 at 2.6.
Average wind speed in West Siang during May is 0.3 m/s. The windiest Mays were 2012, 2013 and 2018, among others at 0.4 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.5°C | 24.0°C | 24.1°C | 23.8°C | 23.6°C | +0.1°C |
| Avg High | 29.1°C | 29.5°C | 29.6°C | 28.3°C | 28.3°C | -0.8°C |
| Avg Low | 18.0°C | 18.4°C | 18.6°C | 19.2°C | 18.8°C | +0.8°C |
| Avg Rain | 205 mm | 266 mm | 275 mm | 344 mm | 354 mm | +149 mm |
May temperatures in West Siang have risen by about 0.3°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 11.2°C (1989) to a record high of 37.2°C (2000).
Rainfall in May is a relatively wet time of year, averaging 285 mm, with a wettest year of 662 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.3°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
A good time to visit West Siang
May is a good time to visit West Siang, with days averaging 29°C and nights around 18.6°C (mean 23.8°C, warmer than West Siang's yearly average) and higher rainfall. October and November are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 28.1°C | 23.9°C | 19.7°C | 32.7°C | 17.0°C | 333 mm | 80% | 0.3 m/s | 3.5 |
| 2024 | 29.6°C | 24.2°C | 18.8°C | 35.8°C | 15.0°C | 221 mm | 75% | 0.3 m/s | 3.8 |
| 2023 | 27.7°C | 22.5°C | 17.2°C | 33.5°C | 14.5°C | 228 mm | 76% | 0.3 m/s | 3.3 |
| 2022 | 28.1°C | 23.5°C | 19.0°C | 31.7°C | 15.4°C | 496 mm | 79% | 0.3 m/s | 3.7 |
| 2021 | 28.1°C | 23.8°C | 19.4°C | 34.5°C | 15.6°C | 363 mm | 79% | 0.3 m/s | 2.6 |
| 2020 | 28.4°C | 23.5°C | 18.7°C | 32.0°C | 15.4°C | 483 mm | 77% | 0.3 m/s | 3.9 |
| 2019 | 27.9°C | 23.6°C | 19.3°C | 32.2°C | 16.9°C | 405 mm | 81% | 0.3 m/s | 2.6 |
| 2018 | 27.8°C | 23.4°C | 18.9°C | 32.5°C | 15.5°C | 262 mm | 78% | 0.4 m/s | 3.5 |
| 2017 | 28.6°C | 24.2°C | 19.7°C | 31.5°C | 14.0°C | 378 mm | 78% | 0.3 m/s | 3.8 |
| 2016 | 28.0°C | 23.5°C | 19.1°C | 32.4°C | 15.2°C | 264 mm | 79% | 0.3 m/s | 4 |
| 2015 | 28.2°C | 23.7°C | 19.2°C | 32.3°C | 16.5°C | 402 mm | 80% | 0.3 m/s | 3.4 |
| 2014 | 28.2°C | 24.0°C | 19.8°C | 33.4°C | 16.4°C | 475 mm | 79% | 0.3 m/s | 3.2 |
| 2013 | 28.0°C | 23.8°C | 19.5°C | 32.8°C | 14.8°C | 384 mm | 81% | 0.4 m/s | 3.6 |
| 2012 | 29.4°C | 24.3°C | 19.1°C | 33.1°C | 13.9°C | 291 mm | 73% | 0.4 m/s | 4.3 |
| 2011 | 29.1°C | 23.8°C | 18.4°C | 33.5°C | 14.9°C | 187 mm | 74% | 0.3 m/s | 4.4 |
| 2010 | 27.3°C | 23.3°C | 19.2°C | 31.0°C | 15.1°C | 395 mm | 82% | 0.3 m/s | 3.4 |
| 2009 | 29.3°C | 24.1°C | 18.9°C | 34.2°C | 16.7°C | 206 mm | 73% | 0.3 m/s | 3.8 |
| 2008 | 29.7°C | 24.1°C | 18.6°C | 32.9°C | 15.8°C | 347 mm | 71% | 0.4 m/s | 3.7 |
| 2007 | 30.1°C | 24.7°C | 19.3°C | 35.1°C | 16.2°C | 205 mm | 72% | 0.3 m/s | 4.4 |
| 2006 | 29.7°C | 24.2°C | 18.6°C | 33.8°C | 15.2°C | 298 mm | 72% | 0.4 m/s | 4.1 |
| 2005 ❄️ | 27.7°C | 22.5°C | 17.4°C | 32.3°C | 15.2°C | 315 mm | 74% | 0.3 m/s | 3.5 |
| 2004 🌧️ | 28.9°C | 23.7°C | 18.5°C | 31.8°C | 15.0°C | 662 mm | 75% | 0.3 m/s | 3.3 |
| 2003 | 29.9°C | 24.1°C | 18.3°C | 34.5°C | 14.2°C | 156 mm | 67% | 0.4 m/s | 3.3 |
| 2002 | 29.3°C | 23.5°C | 17.8°C | 33.9°C | 12.9°C | 157 mm | 72% | 0.4 m/s | 4.9 |
| 2001 | 30.9°C | 25.1°C | 19.2°C | 34.8°C | 16.0°C | 195 mm | 68% | 0.4 m/s | 4.3 |
| 2000 | 30.7°C | 24.9°C | 19.1°C | 37.2°C | 14.2°C | 206 mm | 69% | 0.3 m/s | 3.8 |
| 1999 | 29.6°C | 24.5°C | 19.5°C | 34.8°C | 15.8°C | 158 mm | 74% | 0.3 m/s | 4.1 |
| 1998 🔥 | 31.9°C | 25.7°C | 19.5°C | 36.4°C | 16.4°C | 198 mm | 66% | 0.3 m/s | 4.4 |
| 1997 | 29.5°C | 23.6°C | 17.6°C | 32.9°C | 14.7°C | 232 mm | 69% | 0.4 m/s | 4.2 |
| 1996 | 28.5°C | 23.3°C | 18.2°C | 32.5°C | 13.8°C | 510 mm | 78% | 0.3 m/s | 4.7 |
| 1995 | 30.3°C | 24.7°C | 19.0°C | 35.4°C | 16.1°C | 441 mm | 74% | 0.3 m/s | 5.1 |
| 1994 | 30.3°C | 24.3°C | 18.2°C | 33.3°C | 15.1°C | 291 mm | 68% | 0.3 m/s | 4.2 |
| 1993 | 28.0°C | 23.0°C | 17.9°C | 32.3°C | 15.7°C | 275 mm | 75% | 0.3 m/s | 4.4 |
| 1992 | 28.0°C | 22.7°C | 17.3°C | 32.2°C | 14.2°C | 203 mm | 72% | 0.4 m/s | 3.4 |
| 1991 | 29.8°C | 24.2°C | 18.7°C | 35.7°C | 15.9°C | 69 mm | 68% | 0.3 m/s | 3.8 |
| 1990 | 29.3°C | 23.8°C | 18.2°C | 32.4°C | 14.6°C | 286 mm | 73% | 0.3 m/s | 3.9 |
| 1989 | 29.9°C | 24.2°C | 18.5°C | 33.2°C | 11.2°C | 183 mm | 71% | 0.3 m/s | 4.3 |
| 1988 | 29.0°C | 23.8°C | 18.6°C | 32.4°C | 15.8°C | 400 mm | 75% | 0.3 m/s | 3.9 |
| 1987 | 29.4°C | 23.4°C | 17.5°C | 34.6°C | 14.4°C | 137 mm | 69% | 0.3 m/s | 4.1 |
| 1986 | 30.4°C | 23.8°C | 17.2°C | 34.0°C | 14.1°C | 82 mm | 64% | 0.4 m/s | 4.2 |
| 1985 | 29.5°C | 23.6°C | 17.8°C | 33.2°C | 15.0°C | 124 mm | 69% | 0.4 m/s | 3.3 |
| 1984 | 28.7°C | 23.3°C | 17.9°C | 33.9°C | 14.8°C | 186 mm | 73% | 0.3 m/s | 4.3 |
| 1983 | 28.0°C | 22.6°C | 17.3°C | 34.1°C | 14.3°C | 261 mm | 74% | 0.3 m/s | — |
| 1982 | 28.7°C | 23.5°C | 18.2°C | 31.9°C | 14.9°C | 145 mm | 74% | 0.3 m/s | — |
| 1981 | 28.6°C | 23.6°C | 18.7°C | 32.3°C | 16.2°C | 324 mm | 76% | 0.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 29°C with lows near 18.6°C (mean 23.8°C), based on 45 years of NASA POWER data.
May averages 285 mm of rainfall in West Siang, a relatively wet time of year. The wettest on record was 662 mm in 2004.
The hottest May reached 37.2°C in 2000. The coldest dipped to 11.2°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 0.3°C — but days and nights have moved in opposite directions. Overnight lows rose from 18°C to 18.8°C while daytime highs eased from 28.7°C to 28.3°C, narrowing the gap between day and night.
May is one of the warmer months of the year in West Siang and a relatively wet time of year, so plan for around 29°C daytime highs and 18.6°C at night.
Not quite — May is the 8th coolest month in West Siang, averaging 23.8°C.
For May in West Siang, pack light layers you can adjust through the day, with typical highs of 29°C and lows of 18.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 74% — moderately humid.
Average wind speed in May is 0.3 m/s. The windiest May on record averaged 0.4 m/s (1981).
The wettest May on record was 2004 with 662 mm. On average, May sees 285 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 West Siang 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.
