April is close to Upper Siang's year-round average, with average highs near 26.1°C and lows around 7.5°C (mean 16.8°C). It is one of the drier months, averaging 167 mm of rainfall and 75% relative humidity across the period.
April is close to Upper Siang's year-round average. Across 45 years of records, the warmest April in Upper Siang was 1999 — when the month averaged 18.7°C — while the coldest was 1990 at 13.8°C. Typical April days reach 26.1°C with nights near 7.5°C. The long-term trend is warming, about 0.5°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 16.5°C | 17.1°C | 17.3°C | 17.4°C | +1.5°C |
| Avg High | 25.3°C | 26.5°C | 26.5°C | 26.3°C | 26.2°C | +0.9°C |
| Avg Low | 6.5°C | 6.5°C | 7.7°C | 8.3°C | 8.7°C | +2.2°C |
| Avg Rain | 155 mm | 118 mm | 167 mm | 203 mm | 208 mm | +54 mm |
April temperatures in Upper Siang have risen by about 2.1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 3.8°C (1990) to a record high of 29.1°C (1999).
Rainfall in April is one of the drier months, averaging 167 mm, with a wettest year of 404 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.6°C per decade, narrowing the gap between day and night.
A good time to visit Upper Siang
April is a good time to visit Upper Siang, with days averaging 26.1°C and nights around 7.5°C (mean 16.8°C, close to Upper Siang's yearly average) and higher rainfall. October and November are marginally more temperate, but April still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 25.1°C | 8.7°C | 16.9°C | 297 mm | 80% | 0.4 m/s | 3.2 |
| 2024 | 25.7°C | 9.1°C | 17.4°C | 150 mm | 79% | 0.4 m/s | 3.1 |
| 2023 | 28.0°C | 7.9°C | 17.9°C | 108 mm | 81% | 0.3 m/s | 3.5 |
| 2022 🌧️ | 24.7°C | 10.0°C | 17.3°C | 404 mm | 84% | 0.4 m/s | 2.9 |
| 2021 | 27.9°C | 8.4°C | 18.2°C | 88 mm | 77% | 0.4 m/s | 3.9 |
| 2020 | 25.6°C | 7.8°C | 16.7°C | 203 mm | 79% | 0.4 m/s | 3.4 |
| 2019 | 27.2°C | 8.7°C | 18.0°C | 118 mm | 76% | 0.4 m/s | 4.3 |
| 2018 | 25.5°C | 8.1°C | 16.8°C | 117 mm | 76% | 0.4 m/s | 4.2 |
| 2017 | 27.2°C | 8.3°C | 17.7°C | 322 mm | 82% | 0.4 m/s | 3.4 |
| 2016 | 26.7°C | 9.2°C | 17.9°C | 333 mm | 82% | 0.4 m/s | 2.8 |
| 2015 | 25.3°C | 8.4°C | 16.8°C | 210 mm | 83% | 0.4 m/s | 3.2 |
| 2014 | 26.9°C | 7.8°C | 17.4°C | 73 mm | 72% | 0.4 m/s | 3.9 |
| 2013 | 27.1°C | 8.0°C | 17.5°C | 151 mm | 79% | 0.4 m/s | 3.2 |
| 2012 | 25.3°C | 5.9°C | 15.6°C | 239 mm | 83% | 0.4 m/s | 3.1 |
| 2011 | 24.9°C | 8.6°C | 16.7°C | 115 mm | 79% | 0.4 m/s | 3.8 |
| 2010 | 26.4°C | 10.2°C | 18.3°C | 347 mm | 82% | 0.4 m/s | 3.4 |
| 2009 | 25.8°C | 6.4°C | 16.1°C | 140 mm | 78% | 0.4 m/s | 3.6 |
| 2008 | 25.7°C | 8.6°C | 17.1°C | 181 mm | 73% | 0.4 m/s | 3.3 |
| 2007 | 28.9°C | 7.0°C | 18.0°C | 212 mm | 78% | 0.4 m/s | 3.6 |
| 2006 | 28.8°C | 7.7°C | 18.3°C | 169 mm | 72% | 0.4 m/s | 3.5 |
| 2005 | 25.5°C | 8.1°C | 16.8°C | 179 mm | 76% | 0.4 m/s | 3.2 |
| 2004 | 25.9°C | 8.6°C | 17.3°C | 143 mm | 75% | 0.4 m/s | 3.9 |
| 2003 | 26.2°C | 7.5°C | 16.8°C | 143 mm | 74% | 0.4 m/s | 3.6 |
| 2002 | 25.2°C | 7.4°C | 16.3°C | 229 mm | 74% | 0.4 m/s | 3.8 |
| 2001 | 26.2°C | 7.6°C | 16.9°C | 97 mm | 72% | 0.4 m/s | 2.8 |
| 2000 | 26.3°C | 8.3°C | 17.3°C | 179 mm | 72% | 0.4 m/s | 3.3 |
| 1999 🔥 | 29.1°C | 8.3°C | 18.7°C | 193 mm | 63% | 0.5 m/s | 3.3 |
| 1998 | 27.4°C | 7.7°C | 17.5°C | 69 mm | 67% | 0.5 m/s | 4.2 |
| 1997 | 27.0°C | 6.3°C | 16.7°C | 93 mm | 69% | 0.5 m/s | 4.7 |
| 1996 | 27.9°C | 5.6°C | 16.8°C | 137 mm | 67% | 0.5 m/s | 3.9 |
| 1995 | 25.6°C | 6.2°C | 15.9°C | 92 mm | 65% | 0.5 m/s | 4 |
| 1994 | 26.5°C | 7.9°C | 17.2°C | 161 mm | 71% | 0.4 m/s | 3.7 |
| 1993 | 26.5°C | 4.5°C | 15.5°C | 85 mm | 68% | 0.5 m/s | 3.7 |
| 1992 | 25.1°C | 7.0°C | 16.1°C | 122 mm | 68% | 0.5 m/s | 4.2 |
| 1991 | 26.2°C | 7.9°C | 17.1°C | 35 mm | 69% | 0.4 m/s | 3.3 |
| 1990 ❄️ | 23.7°C | 3.8°C | 13.8°C | 194 mm | 80% | 0.4 m/s | 3.1 |
| 1989 | 24.6°C | 6.2°C | 15.4°C | 174 mm | 73% | 0.4 m/s | 4.1 |
| 1988 | 27.0°C | 5.5°C | 16.3°C | 147 mm | 71% | 0.5 m/s | 3.7 |
| 1987 | 26.0°C | 9.1°C | 17.6°C | 156 mm | 74% | 0.4 m/s | 4 |
| 1986 | 26.2°C | 7.6°C | 16.9°C | 149 mm | 76% | 0.4 m/s | 3.9 |
| 1985 | 26.6°C | 4.4°C | 15.5°C | 111 mm | 76% | 0.4 m/s | 3.6 |
| 1984 | 25.0°C | 8.1°C | 16.5°C | 156 mm | 75% | 0.4 m/s | 3.6 |
| 1983 | 23.9°C | 5.8°C | 14.8°C | 124 mm | 73% | 0.4 m/s | — |
| 1982 | 23.0°C | 6.9°C | 14.9°C | 166 mm | 84% | 0.3 m/s | — |
| 1981 | 25.0°C | 5.2°C | 15.1°C | 210 mm | 77% | 0.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 26.1°C with lows near 7.5°C (mean 16.8°C), based on 45 years of NASA POWER data.
April averages 167 mm of rainfall in Upper Siang, one of the drier months. The wettest on record was 404 mm in 2022.
The hottest April reached 29.1°C in 1999. The coldest dipped to 3.8°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 2.1°C. Daytime highs moved from 24.7°C to 26.3°C and overnight lows from 6.1°C to 8.8°C over the same span.
April is close to Upper Siang's year-round average and one of the drier months, so plan for around 26.1°C daytime highs and 7.5°C at night.
Not quite — April is the 6th coolest month in Upper Siang, averaging 16.8°C.
For April in Upper Siang, pack warm layers and a jacket for chilly mornings, with typical highs of 26.1°C and lows of 7.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 75% — quite humid.
Average wind speed in April is 0.4 m/s. The windiest April on record averaged 0.5 m/s (1988).
The wettest April on record was 2022 with 404 mm. On average, April sees 167 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
