May is one of the warmer months of the year in Upper Siang, with average highs near 28.7°C and lows around 10.7°C (mean 19.7°C). It is a relatively wet time of year, averaging 228 mm of rainfall and 77% relative humidity across the period.
May is one of the warmer months of the year in Upper Siang. Across 45 years of records, the warmest May in Upper Siang was 2003 — when the month averaged 22.2°C — while the coldest was 1989 at 17.5°C. Typical May days reach 28.7°C with nights near 10.7°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 | 19.2°C | 19.6°C | 20.3°C | 19.5°C | 19.8°C | +0.6°C |
| Avg High | 28.4°C | 28.5°C | 29.8°C | 28.1°C | 28.5°C | +0.1°C |
| Avg Low | 10.0°C | 10.8°C | 10.7°C | 10.8°C | 11.1°C | +1.1°C |
| Avg Rain | 164 mm | 220 mm | 218 mm | 271 mm | 286 mm | +122 mm |
May temperatures in Upper Siang have risen by about 1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 7.3°C (1989) to a record high of 34.4°C (2003).
Rainfall in May is a relatively wet time of year, averaging 228 mm, with a wettest year of 457 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Upper Siang
May is one of the best times to visit Upper Siang. Expect days averaging 28.7°C and nights around 10.7°C (mean 19.7°C) — warmer than Upper Siang's yearly average — with higher rainfall (228 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 28.0°C | 12.3°C | 20.1°C | 273 mm | 82% | 0.3 m/s | 3.5 |
| 2024 | 30.2°C | 10.3°C | 20.3°C | 189 mm | 78% | 0.3 m/s | 3.9 |
| 2023 | 28.8°C | 10.6°C | 19.7°C | 172 mm | 79% | 0.3 m/s | 3.6 |
| 2022 | 27.7°C | 10.9°C | 19.3°C | 392 mm | 81% | 0.3 m/s | 3.8 |
| 2021 | 29.5°C | 11.3°C | 20.4°C | 273 mm | 83% | 0.3 m/s | 3 |
| 2020 | 26.5°C | 11.0°C | 18.7°C | 415 mm | 78% | 0.4 m/s | 4.1 |
| 2019 | 27.3°C | 12.6°C | 20.0°C | 301 mm | 82% | 0.3 m/s | 2.6 |
| 2018 | 27.9°C | 11.7°C | 19.8°C | 222 mm | 80% | 0.3 m/s | 3.5 |
| 2017 | 29.3°C | 9.2°C | 19.3°C | 301 mm | 81% | 0.3 m/s | 3.9 |
| 2016 | 29.1°C | 10.2°C | 19.6°C | 217 mm | 81% | 0.3 m/s | 4.1 |
| 2015 | 27.5°C | 12.2°C | 19.9°C | 317 mm | 83% | 0.3 m/s | 3.6 |
| 2014 | 28.4°C | 11.4°C | 19.9°C | 327 mm | 82% | 0.3 m/s | 3.2 |
| 2013 | 28.6°C | 9.7°C | 19.2°C | 288 mm | 82% | 0.3 m/s | 3.9 |
| 2012 | 28.8°C | 9.3°C | 19.0°C | 227 mm | 75% | 0.4 m/s | 4.8 |
| 2011 | 27.9°C | 10.7°C | 19.3°C | 160 mm | 77% | 0.4 m/s | 4.5 |
| 2010 | 26.4°C | 10.7°C | 18.6°C | 348 mm | 83% | 0.3 m/s | 3.5 |
| 2009 | 28.6°C | 12.1°C | 20.4°C | 171 mm | 76% | 0.3 m/s | 4.3 |
| 2008 | 30.5°C | 11.3°C | 20.9°C | 247 mm | 72% | 0.4 m/s | 4 |
| 2007 | 29.3°C | 12.1°C | 20.7°C | 166 mm | 75% | 0.4 m/s | 4.4 |
| 2006 | 28.8°C | 10.9°C | 19.8°C | 263 mm | 74% | 0.4 m/s | 4.1 |
| 2005 | 28.3°C | 10.6°C | 19.5°C | 249 mm | 76% | 0.4 m/s | 3.7 |
| 2004 🌧️ | 28.0°C | 9.7°C | 18.9°C | 457 mm | 77% | 0.4 m/s | 3.5 |
| 2003 🔥 | 34.4°C | 9.9°C | 22.2°C | 124 mm | 71% | 0.4 m/s | 3.6 |
| 2002 | 28.8°C | 9.2°C | 19.0°C | 129 mm | 74% | 0.4 m/s | 4.7 |
| 2001 | 31.0°C | 11.5°C | 21.2°C | 162 mm | 71% | 0.4 m/s | 4.2 |
| 2000 | 30.5°C | 10.0°C | 20.3°C | 211 mm | 73% | 0.4 m/s | 4 |
| 1999 | 30.5°C | 11.4°C | 20.9°C | 172 mm | 77% | 0.3 m/s | 4 |
| 1998 | 29.9°C | 12.2°C | 21.0°C | 179 mm | 70% | 0.4 m/s | 5 |
| 1997 | 27.6°C | 10.2°C | 18.9°C | 166 mm | 72% | 0.4 m/s | 4.6 |
| 1996 | 27.4°C | 9.3°C | 18.4°C | 377 mm | 81% | 0.3 m/s | 4.3 |
| 1995 | 28.9°C | 11.8°C | 20.3°C | 356 mm | 78% | 0.3 m/s | 5.1 |
| 1994 | 28.4°C | 10.2°C | 19.3°C | 227 mm | 72% | 0.4 m/s | 4.4 |
| 1993 | 28.2°C | 11.0°C | 19.6°C | 216 mm | 78% | 0.4 m/s | 4.2 |
| 1992 | 27.7°C | 11.1°C | 19.4°C | 154 mm | 75% | 0.4 m/s | 3.9 |
| 1991 | 28.4°C | 10.6°C | 19.5°C | 104 mm | 76% | 0.3 m/s | 3.8 |
| 1990 | 27.8°C | 10.2°C | 19.0°C | 246 mm | 76% | 0.4 m/s | 4.2 |
| 1989 ❄️ | 27.7°C | 7.3°C | 17.5°C | 160 mm | 75% | 0.4 m/s | 4.6 |
| 1988 | 29.0°C | 10.9°C | 19.9°C | 306 mm | 77% | 0.4 m/s | 3.9 |
| 1987 | 29.4°C | 10.9°C | 20.1°C | 107 mm | 74% | 0.4 m/s | 4.1 |
| 1986 | 30.8°C | 9.1°C | 19.9°C | 79 mm | 68% | 0.4 m/s | 5 |
| 1985 | 27.8°C | 10.1°C | 18.9°C | 102 mm | 73% | 0.4 m/s | 3.4 |
| 1984 | 28.1°C | 9.6°C | 18.8°C | 135 mm | 77% | 0.3 m/s | 4.6 |
| 1983 | 28.7°C | 9.8°C | 19.2°C | 216 mm | 77% | 0.4 m/s | — |
| 1982 | 27.4°C | 10.2°C | 18.8°C | 116 mm | 77% | 0.4 m/s | — |
| 1981 | 26.7°C | 12.3°C | 19.5°C | 249 mm | 79% | 0.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 28.7°C with lows near 10.7°C (mean 19.7°C), based on 45 years of NASA POWER data.
May averages 228 mm of rainfall in Upper Siang, a relatively wet time of year. The wettest on record was 457 mm in 2004.
The hottest May reached 34.4°C in 2003. The coldest dipped to 7.3°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1°C. Daytime highs moved from 27.7°C to 28.8°C and overnight lows from 10.4°C to 11.1°C over the same span.
May is one of the warmer months of the year in Upper Siang and a relatively wet time of year, so plan for around 28.7°C daytime highs and 10.7°C at night.
Not quite — May is the 8th coolest month in Upper Siang, averaging 19.7°C.
For May in Upper Siang, pack light layers you can adjust through the day, with typical highs of 28.7°C and lows of 10.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 77% — quite humid.
Average wind speed in May is 0.4 m/s. The windiest May on record averaged 0.4 m/s (1981).
The wettest May on record was 2004 with 457 mm. On average, May sees 228 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 Upper 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.
