Ilām, Nepal Climate
The warmest month is May, with an average high of 28°C; the coldest is January, with an average low of 7°C. A normal year brings 1360 mm of precipitation.
Temperature through the year
The normal daily high and low. The line marks today.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
Normals for Sep 25
- Normal high
- 24°C
- Normal low
- 18°C
- Reanalysis high
- 26°Cin 1995
- Reanalysis low
- 16°Cin 1995
- Chance of a wet day
- 66%
- Daylight
- 12 h 04 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Warmest | Coldest | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 18°C | 7°C | 23°C (1991) | 2°C (1998) | 6 mm | 0.0 |
| February | 21°C | 9°C | 28°C (2006) | 2°C (2008) | 11 mm | 2.8 |
| March | 25°C | 12°C | 32°C (1992) | 4°C (2019) | 25 mm | 6.2 |
| April | 28°C | 15°C | 35°C (1992) | 9°C (1998) | 54 mm | 12.0 |
| May | 28°C | 18°C | 35°C (1994) | 13°C (2002) | 118 mm | 18.6 |
| June | 28°C | 20°C | 33°C (1998) | 16°C (1996) | 210 mm | 24.0 |
| July | 26°C | 20°C | 30°C (1992) | 18°C (1995) | 366 mm | 27.9 |
| August | 26°C | 20°C | 30°C (1994) | 17°C (2009) | 295 mm | 27.9 |
| September | 25°C | 19°C | 28°C (1993) | 15°C (2004) | 210 mm | 24.0 |
| October | 23°C | 16°C | 27°C (2020) | 11°C (1992) | 56 mm | 6.2 |
| November | 21°C | 12°C | 26°C (1995) | 7°C (1991) | 6 mm | 0.0 |
| December | 19°C | 9°C | 23°C (2014) | 1°C (2003) | 3 mm | 0.0 |
| Year | 24°C | 14°C | 1360 mm | 150 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
1360 mm in a normal year, most in July.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Ilām.
The muggiest month is August, when 99 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | -1°C | 47% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | -1°C | 41% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 1°C | 36% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 6°C | 44% | 89% | 10% | 1% | 0% | 0% | 0% |
| May | 13°C | 61% | 33% | 34% | 29% | 4% | 0% | 0% |
| June | 18°C | 77% | 3% | 6% | 30% | 60% | 2% | 0% |
| July | 20°C | 88% | 0% | 0% | 2% | 89% | 9% | 0% |
| August | 20°C | 89% | 0% | 0% | 1% | 89% | 10% | 0% |
| September | 19°C | 88% | 0% | 2% | 29% | 69% | 1% | 0% |
| October | 14°C | 78% | 28% | 36% | 30% | 6% | 0% | 0% |
| November | 8°C | 66% | 93% | 7% | 0% | 0% | 0% | 0% |
| December | 2°C | 55% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is December, with the sky 60 percent covered on average; the cloudiest is August, at 87 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is March, averaging 9.4 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 18, with 13 h 51 min of daylight; the shortest is Dec 20, with 10 h 26 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Ilām in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
Where no station record is within reach, the extremes shown are the highest and lowest the reanalysis produced for the date in 1991-2020, not measured records.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.