May is one of the warmer months of the year in Upper Siang, with average highs near 24.2°C and lows around 14.1°C (mean 19.2°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 1998 — when the month averaged 20.8°C — while the coldest was 2023 at 17.8°C. Typical May days reach 24.2°C with nights near 14.1°C. The long-term May temperature trend is broadly flat.
May is a relatively wet time of year in Upper Siang, averaging 228 mm of rainfall. The wettest May on record was 2004 with 457 mm, while the driest was 1986 at 79 mm.
Relative humidity in Upper Siang during May averages 77%. The most humid May was 2010 at 83%, and the least humid was 1986 at 68%.
May receives about 4 kWh/m²/day of solar energy in Upper Siang. The sunniest May was 1995 at 5.1 kWh/m²/day, and the cloudiest was 2019 at 2.6.
Average wind speed in Upper Siang during May is 0.4 m/s. The windiest Mays were 2011, 2012 and 2020, 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 | 18.8°C | 19.1°C | 19.5°C | 19.1°C | 19.0°C | +0.2°C |
| Avg High | 24.1°C | 24.5°C | 24.8°C | 23.7°C | 23.6°C | -0.5°C |
| Avg Low | 13.5°C | 13.8°C | 14.1°C | 14.6°C | 14.3°C | +0.8°C |
| Avg Rain | 164 mm | 220 mm | 218 mm | 271 mm | 286 mm | +122 mm |
May temperatures in Upper Siang have risen by about 0.3°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 fell about 0.2°C per decade while lows rose 0.3°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 24.2°C and nights around 14.1°C (mean 19.2°C) — warmer than Upper Siang's yearly average — with higher rainfall (228 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.9°C | 19.6°C | 15.3°C | 28.0°C | 12.3°C | 273 mm | 82% | 0.3 m/s | 3.5 |
| 2024 | 24.5°C | 19.5°C | 14.5°C | 30.2°C | 10.3°C | 189 mm | 78% | 0.3 m/s | 3.9 |
| 2023 ❄️ | 22.6°C | 17.8°C | 12.9°C | 28.8°C | 10.6°C | 172 mm | 79% | 0.3 m/s | 3.6 |
| 2022 | 23.7°C | 19.0°C | 14.2°C | 27.7°C | 10.9°C | 392 mm | 81% | 0.3 m/s | 3.8 |
| 2021 | 23.1°C | 19.0°C | 14.9°C | 29.5°C | 11.3°C | 273 mm | 83% | 0.3 m/s | 3 |
| 2020 | 23.7°C | 18.9°C | 14.1°C | 26.5°C | 11.0°C | 415 mm | 78% | 0.4 m/s | 4.1 |
| 2019 | 23.3°C | 18.9°C | 14.6°C | 27.3°C | 12.6°C | 301 mm | 82% | 0.3 m/s | 2.6 |
| 2018 | 23.4°C | 18.8°C | 14.3°C | 27.9°C | 11.7°C | 222 mm | 80% | 0.3 m/s | 3.5 |
| 2017 | 23.9°C | 19.5°C | 15.0°C | 29.3°C | 9.2°C | 301 mm | 81% | 0.3 m/s | 3.9 |
| 2016 | 23.4°C | 19.0°C | 14.5°C | 29.1°C | 10.2°C | 217 mm | 81% | 0.3 m/s | 4.1 |
| 2015 | 22.9°C | 18.7°C | 14.5°C | 27.5°C | 12.2°C | 317 mm | 83% | 0.3 m/s | 3.6 |
| 2014 | 23.6°C | 19.4°C | 15.1°C | 28.4°C | 11.4°C | 327 mm | 82% | 0.3 m/s | 3.2 |
| 2013 | 23.8°C | 19.4°C | 15.0°C | 28.6°C | 9.7°C | 288 mm | 82% | 0.3 m/s | 3.9 |
| 2012 | 24.7°C | 19.6°C | 14.4°C | 28.8°C | 9.3°C | 227 mm | 75% | 0.4 m/s | 4.8 |
| 2011 | 24.4°C | 19.2°C | 14.1°C | 27.9°C | 10.7°C | 160 mm | 77% | 0.4 m/s | 4.5 |
| 2010 | 23.2°C | 18.8°C | 14.4°C | 26.4°C | 10.7°C | 348 mm | 83% | 0.3 m/s | 3.5 |
| 2009 | 24.5°C | 19.4°C | 14.3°C | 28.6°C | 12.1°C | 171 mm | 76% | 0.3 m/s | 4.3 |
| 2008 | 25.5°C | 19.8°C | 14.0°C | 30.5°C | 11.3°C | 247 mm | 72% | 0.4 m/s | 4 |
| 2007 | 25.4°C | 20.0°C | 14.7°C | 29.3°C | 12.1°C | 166 mm | 75% | 0.4 m/s | 4.4 |
| 2006 | 25.1°C | 19.7°C | 14.3°C | 28.8°C | 10.9°C | 263 mm | 74% | 0.4 m/s | 4.1 |
| 2005 | 23.1°C | 18.1°C | 13.1°C | 28.3°C | 10.6°C | 249 mm | 76% | 0.4 m/s | 3.7 |
| 2004 🌧️ | 24.0°C | 19.0°C | 14.0°C | 28.0°C | 9.7°C | 457 mm | 77% | 0.4 m/s | 3.5 |
| 2003 | 24.5°C | 19.1°C | 13.7°C | 34.4°C | 9.9°C | 124 mm | 71% | 0.4 m/s | 3.6 |
| 2002 | 24.7°C | 19.1°C | 13.6°C | 28.8°C | 9.2°C | 129 mm | 74% | 0.4 m/s | 4.7 |
| 2001 | 25.8°C | 20.1°C | 14.5°C | 31.0°C | 11.5°C | 162 mm | 71% | 0.4 m/s | 4.2 |
| 2000 | 25.7°C | 20.3°C | 14.8°C | 30.5°C | 10.0°C | 211 mm | 73% | 0.4 m/s | 4 |
| 1999 | 24.5°C | 19.8°C | 15.0°C | 30.5°C | 11.4°C | 172 mm | 77% | 0.3 m/s | 4 |
| 1998 🔥 | 26.6°C | 20.8°C | 15.1°C | 29.9°C | 12.2°C | 179 mm | 70% | 0.4 m/s | 5 |
| 1997 | 24.1°C | 18.6°C | 13.2°C | 27.6°C | 10.2°C | 166 mm | 72% | 0.4 m/s | 4.6 |
| 1996 | 23.0°C | 18.3°C | 13.5°C | 27.4°C | 9.3°C | 377 mm | 81% | 0.3 m/s | 4.3 |
| 1995 | 25.5°C | 20.0°C | 14.6°C | 28.9°C | 11.8°C | 356 mm | 78% | 0.3 m/s | 5.1 |
| 1994 | 25.2°C | 19.4°C | 13.6°C | 28.4°C | 10.2°C | 227 mm | 72% | 0.4 m/s | 4.4 |
| 1993 | 23.5°C | 18.4°C | 13.2°C | 28.2°C | 11.0°C | 216 mm | 78% | 0.4 m/s | 4.2 |
| 1992 | 23.4°C | 18.2°C | 13.0°C | 27.7°C | 11.1°C | 154 mm | 75% | 0.4 m/s | 3.9 |
| 1991 | 24.1°C | 18.9°C | 13.7°C | 28.4°C | 10.6°C | 104 mm | 76% | 0.3 m/s | 3.8 |
| 1990 | 24.6°C | 19.0°C | 13.5°C | 27.8°C | 10.2°C | 246 mm | 76% | 0.4 m/s | 4.2 |
| 1989 | 24.9°C | 19.6°C | 14.3°C | 27.7°C | 7.3°C | 160 mm | 75% | 0.4 m/s | 4.6 |
| 1988 | 24.4°C | 19.2°C | 13.9°C | 29.0°C | 10.9°C | 306 mm | 77% | 0.4 m/s | 3.9 |
| 1987 | 23.9°C | 18.6°C | 13.3°C | 29.4°C | 10.9°C | 107 mm | 74% | 0.4 m/s | 4.1 |
| 1986 | 24.7°C | 18.7°C | 12.6°C | 30.8°C | 9.1°C | 79 mm | 68% | 0.4 m/s | 5 |
| 1985 | 24.2°C | 18.8°C | 13.3°C | 27.8°C | 10.1°C | 102 mm | 73% | 0.4 m/s | 3.4 |
| 1984 | 23.7°C | 18.6°C | 13.5°C | 28.1°C | 9.6°C | 135 mm | 77% | 0.3 m/s | 4.6 |
| 1983 | 23.5°C | 18.1°C | 12.7°C | 28.7°C | 9.8°C | 216 mm | 77% | 0.4 m/s | — |
| 1982 | 24.0°C | 18.9°C | 13.7°C | 27.4°C | 10.2°C | 116 mm | 77% | 0.4 m/s | — |
| 1981 | 23.7°C | 18.9°C | 14.1°C | 26.7°C | 12.3°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 24.2°C with lows near 14.1°C (mean 19.2°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 0.3°C — but days and nights have moved in opposite directions. Overnight lows rose from 13.5°C to 14.4°C while daytime highs eased from 23.8°C to 23.6°C, narrowing the gap between day and night.
May is one of the warmer months of the year in Upper Siang and a relatively wet time of year, so plan for around 24.2°C daytime highs and 14.1°C at night.
Not quite — May is the 8th coolest month in Upper Siang, averaging 19.2°C.
For May in Upper Siang, pack light layers you can adjust through the day, with typical highs of 24.2°C and lows of 14.1°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.
