Climate and monthly weather forecastIlam, Nepal
Climate and monthly weather forecast
The climate of Ilam
Ilam, located in Nepal, experiences a Cwa Köppen climate classification, which is characterized as a humid subtropical climate with dry winters. Throughout the course of the year, the temperature fluctuates from 11.4°C (52.5°F) to 32.1°C (89.8°F). A similar pattern is seen in the relative humidity, with the minimum at 37% in March and a peak of 81% in July.Precipitation patterns are more drastic. There are small amounts of rain from November to February, with rainfall ranging from 6mm (0.24") to 10mm (0.39"). However, from March, rainfall begins to escalate, peaking in July with a substantial 552mm (21.73") and then gradually decreases. There is rainfall almost every day in July and August, while November sees only 3.5 days of rainfall on average. The number of daylight hours tends to increase from 10.7 hours in January to a maximum of 13.8 hours in June. Conversely, the duration of sunshine reduces in the rainy months, reaching its lowest in July and August with zero sunny days and then increases again.
Wind speed exhibits little variation, with a range from 5.2km/h (3.2mph) to 8.9km/h (5.5mph), with the maximum winds seen in April. The pressure also displays a minor shift, varying between 1003.6mb to 1016.4mb.
The best time to visit Ilam
Undeniably, the ideal period to explore Ilam revolves around the months of October and November. During this time, the weather is pleasant, showing mild temperatures from 25.6°C (78.1°F) to 28.2°C (82.8°F) and low rainfall ranging from 8mm (0.31") to 64mm (2.52"). These months also boast 19.9 and 24.4 days of sunshine respectively, offering clear skies and plenty of daylight for tourists to relish.The worst time to visit Ilam
Conversely, the months between May and September may not be ideal for a visit. The temperatures are higher, hovering between 30.4°C (86.7°F) and 31.6°C (88.9°F) and the humidity levels reach up to 79%. With the monsoon onset, rainfall is quite high, ranging from 186mm (7.32") in May to an outstanding 552mm (21.73") in July. The sunshine days are sparse during this time, making it less suitable for outdoor activities.Spring weather in Ilam
Spring in Ilam is from March to May. During these months, temperatures range from 25.1°C (77.2°F) to 32.1°C (89.8°F) with a significant increase in rainfall from 24mm (0.94") in March to 186mm (7.32") in May. With relative humidity between 37% to 62%, the weather is comfortably moderate.Summer weather in Ilam
Summer months, from June to August, witness high temperatures ranging from 30.4°C (86.7°F) to 31.4°C (88.5°F). The humidity shoots up to 74-81% and these months see the peak rainfall in the year with volumes between 352mm (13.86") and 552mm (21.73"). The daylight is abundant but sunshine is minimal due to dense cloud cover.Autumn weather in Ilam
Autumn arrives in September and continues until November. During this span, temperatures gradually decrease from 29.5°C (85.1°F) to 25.6°C (78.1°F). Rainfall recedes considerably from 303mm (11.93") in September to a mere 8mm (0.31") by November. Autumn experiences diminished humidity levels and an increase in the count of sunlit days.Winter weather in Ilam
Winter in Ilam is from December to February. This season is marked by cooler temperatures fluctuating between 11.4°C (52.5°F) and 25.1°C (77.2°F). Rainfall is at its lowest from 6mm (0.24") to 10mm (0.39") monthly. The days are shorter, and the duration of sunshine reduces slightly as well. However, this season presents the best visibility with clear skies and minimal cloud cover.Weather in January
The weather in Ilam, Nepal, takes a mild turn in January, transitioning from the cooler winter months. Among the noticeable characteristics, minimum temperatures rise from 11.4°C (52.5°F) providing a respite from the winter chill. Weather in January »Weather in February
In February, inhabitants of Ilam experience the progression of winter into early spring as the weather begins to warm slightly and humidity levels slightly drop. This is reflected in the upsurge in maximum temperatures, peaking at 25.1°C (77.2°F) during the month. Weather in February »Weather in March
The springtime bloom in Ilam, Nepal, brews up charming weather in March. A significant increment in rainfall can be observed with precipitation measuring up to 24mm (0.94"). March marks a pivot point in the climatic conditions of the region with warmer days and increased rainfall, signaling the approach of the rainy season. Weather in March »Weather in April
April brings the first real signs of summer to Ilam with significant increases in both temperature and rainfall. Maximum temperatures climb steeply, reaching up to 32.1°C (89.8°F), indicating the onset of the hot season. The city experiences a spike in rainfall, soaking the landscape and transforming the scenic beauty into a lush green canvas. Weather in April »Weather in May
By May, summer is well established in Ilam, Nepal. The rainfall reaches its first peak for the year with a substantial 186mm (7.32"), hinting towards a monsoon-like pattern. The increase in temperature and moisture levels translate into more humid conditions, leading to occasional muggy afternoons. Weather in May »Weather in June
Bearing witness to the highest precipitation throughout the year, June in Ilam sees a remarkable amount of rainfall at 352mm (13.86"). The intense rainfall, akin to monsoon showers, saturates the city-scape ushering in incredibly lush and verdant surroundings. Weather in June »Weather in July
Ilam's weather narrative reaches its crescendo in July with the maximum recorded rainfall of 552mm (21.73") for the year. The vigorous rainfall patterns contribute to an overall increase in humidity levels, which occurs consistently throughout the month. Weather in July »Weather in August
August in Ilam maintains a similar weather pattern as seen in July with an abundance of rainfall, although slightly less, amounting up to 411mm (16.18"). The city, immersed in a monsoon-like state, continues to experience high humidity levels synonymous with the rainy season. Weather in August »Weather in September
With the gradual transition towards autumn, September in Ilam manifests a discernible drop in rainfall cresting at 303mm (11.93"). The onset of fall introduces a mild touch to the weather, marking a break from the intense monsoon months. Weather in September »Weather in October
In October, the city of Ilam leaves behind the heavy rainfall and high humidity of previous months, entering the dry and mild season. Rainfall drastically drops to a mere 64mm (2.52"), ushering a long-awaited break from the heavy rains. Weather in October »Weather in November
November announces the arrival of winter in Ilam, with a noticeable drop in temperatures along with a considerable decrease in rainfall, as low as 8mm (0.31"). This month, the city embraces its winter season fully, characterized by cooler temperatures and minimal precipitation. Weather in November »Weather in December
Wrapping up the year in Ilam, December witnesses the peak of winter with minimum temperatures dropping to 13°C (55.4°F). The city steps in its coldest month, characterized by markedly lower temperatures and bare minimum rainfall of 6mm (0.24"). Weather in December »Updated: Aug 13, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With average high and low temperatures of 21.8°C (71.2°F) and 11.4°C (52.5°F) respectively, January is Ilam's coldest month.
The months with the least rainfall are January and December Rain falls for 4.2 days and accumulates 6mm (0.24") of rain.
In Ilam, Nepal, during the entire year, the rain falls for 207.7 days and collects up to 2007mm (79.02") of precipitation.
January and February, with an average of 7.4h of sunshine, are months with the least sunshine.
January, November and December, with an average maximum UV index of 5, are months with the lowest UV index.
March is the least humid month, with an average relative humidity of 37%.
The months with the highest UV index are March, June and August, with an average maximum UV index of 7.
The warmest temperatures occur during April, when averages reach a peak of 32.1°C (89.8°F) and a low of 21.5°C (70.7°F).
With an average of 11.1h of sunshine, May has the most sunshine of the year.
June has the longest days of the year, with an average of 13h and 48min of daylight.
With an average relative humidity of 81%, July is the most humid month.
July is the month with the most rainfall. Rain falls for 30.8 days and accumulates 552mm (21.73") of precipitation.
December has the shortest days of the year, with an average of 10h and 30min of daylight.
Ilam does not utilize Daylight Saving Time (DST). +0545 timezone is used over the entire year.
Average temperature
Ilam, Nepal
The warmest month (with the highest average high temperature) is April (32.1°C).
The month with the lowest average high temperature is January (21.8°C).
The month with the highest average low temperature is July (24.4°C).
The coldest month (with the lowest average low temperature) is January (11.4°C).
Average pressure
Ilam, Nepal
- Average pressure in January:
1016.4mbar - Average pressure in February:
1014.9mbar - Average pressure in March:
1012.7mbar - Average pressure in April:
1010.1mbar - Average pressure in May:
1007.5mbar - Average pressure in June:
1003.9mbar
- Average pressure in July:
1003.6mbar - Average pressure in August:
1005.1mbar - Average pressure in September:
1008.3mbar - Average pressure in October:
1012.7mbar - Average pressure in November:
1014.9mbar - Average pressure in December:
1015.9mbar
The month with the highest atmospheric pressure is January (1016.4mbar).
The month with the lowest atmospheric pressure is July (1003.6mbar).
Average wind speed
Ilam, Nepal
- Average wind speed in January:
5.7km/h - Average wind speed in February:
6.7km/h - Average wind speed in March:
7.7km/h - Average wind speed in April:
8.9km/h - Average wind speed in May:
8.2km/h - Average wind speed in June:
7.9km/h
- Average wind speed in July:
8.6km/h - Average wind speed in August:
7.4km/h - Average wind speed in September:
6.6km/h - Average wind speed in October:
5.5km/h - Average wind speed in November:
5.2km/h - Average wind speed in December:
5.2km/h
The windiest month (with the highest average wind speed) is April (8.9km/h).
The calmest months (with the lowest average wind speed) are November and December (5.2km/h).
Average humidity
Ilam, Nepal
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is March (37%).
Average rainfall
Ilam, Nepal
The wettest month (with the highest rainfall) is July (552mm).
The driest months (with the least rainfall) are January and December (6mm).
Average rainfall days
Ilam, Nepal
- Average rainfall days in January:
4.2 days - Average rainfall days in February:
4.6 days - Average rainfall days in March:
8.9 days - Average rainfall days in April:
19 days - Average rainfall days in May:
28.3 days - Average rainfall days in June:
29.7 days
- Average rainfall days in July:
30.8 days - Average rainfall days in August:
30.8 days - Average rainfall days in September:
27.7 days - Average rainfall days in October:
14.6 days - Average rainfall days in November:
5.6 days - Average rainfall days in December:
3.5 days
The months with the highest number of rainy days are July and August (30.8 days).
The month with the least rainy days is December (3.5 days).
Average daylight / Average sunshine
Ilam, Nepal
- Average daylight in January:
10h and 42min - Average daylight in February:
11h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 48min - Average daylight in May:
13h and 30min - Average daylight in June:
13h and 48min
- Average daylight in July:
13h and 36min - Average daylight in August:
13h and 6min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 30min - Average daylight in November:
10h and 48min - Average daylight in December:
10h and 30min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in January:
7h and 24min - Average sunshine in February:
7h and 24min - Average sunshine in March:
9h and 24min - Average sunshine in April:
10h and 36min - Average sunshine in May:
11h and 6min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
8h and 30min - Average sunshine in August:
9h and 12min - Average sunshine in September:
8h and 24min - Average sunshine in October:
9h and 18min - Average sunshine in November:
9h and 0min - Average sunshine in December:
7h and 30min
The month with the most sunshine is May (Average sunshine: 11h and 6min).
The months with the least sunshine are January and February (Average sunshine: 7h and 24min).
Average sunshine days
Ilam, Nepal
- Average sunshine days in January:
23.8 days - Average sunshine days in February:
21.3 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
8.1 days - Average sunshine days in May:
1.6 days - Average sunshine days in June:
0 days
- Average sunshine days in July:
0 days - Average sunshine days in August:
0.1 days - Average sunshine days in September:
0.7 days - Average sunshine days in October:
8 days - Average sunshine days in November:
19.9 days - Average sunshine days in December:
24.4 days
The month with the most sunshine days is December (24.4 days).
The months with the least sunshine days are June and July (0 days).
Average UV index
Ilam, Nepal
The months with the highest UV index are March, June and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 5).
Average cloud cover
Ilam, Nepal
The month with the most cloud cover is July (Cloud cover 54).
The months with the least cloud cover are January, February, November and December (Cloud cover 10).
Average visibility
Ilam, Nepal
The months with the highest visibility are January, February, March, April, October, November and December (10km).
The months with the lowest visibility are May, June, July, August and September (9km).
