Ilam climate
Ilam (Iran) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 16 °C60 °F, and about 387 mm15 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Ilam climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 846 | −327 | 236 | 652.6 |
| Feb | 1050 | −229 | 439 | 602.3 |
| Mar | 1559 | 236 | 947 | 602.3 |
| Apr | 2069 | 744 | 1457 | 502.0 |
| May | 2781 | 1355 | 2068 | 150.6 |
| Jun | 3493 | 1763 | 2678 | 00.0 |
| Jul | 3799 | 2170 | 2984 | 20.1 |
| Aug | 3799 | 2170 | 2984 | 10.0 |
| Sep | 3290 | 1762 | 2576 | 20.1 |
| Oct | 2577 | 1253 | 1965 | 281.1 |
| Nov | 1559 | 438 | 949 | 562.2 |
| Dec | 1050 | −130 | 440 | 491.9 |
| Year | 3799 | −327 | 1660 | 38715 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 62% | 57% | 2.9 | 10:09 |
| Feb | 61% | 57% | 3.8 | 10:56 |
| Mar | 54% | 54% | 5.1 | 11:53 |
| Apr | 49% | 58% | 6.1 | 12:59 |
| May | 37% | 46% | 7.2 | 13:53 |
| Jun | 21% | 27% | 8.4 | 14:22 |
| Jul | 16% | 27% | 7.9 | 14:11 |
| Aug | 16% | 27% | 7.3 | 13:23 |
| Sep | 18% | 29% | 6.4 | 12:20 |
| Oct | 29% | 44% | 4.6 | 11:16 |
| Nov | 49% | 50% | 3.4 | 10:22 |
| Dec | 59% | 54% | 2.7 | 9:56 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Ilam is like
The warmest month is July, with an average high of 37 °C99 °F and a low of 21 °C70 °F. The coldest is January, when highs average 8 °C46 °F and lows −3 °C27 °F. Seasons are strongly marked: the warmest month is on average 26.9 °C48.4 °F warmer than the coldest.
It is dry, with about 387 mm15 in of precipitation per year. The wettest three-month stretch is January–March, which brings 48% of the annual total. Months with less than 20 mm0.8 in on average: May–September. The wettest month is January (65 mm2.6 in), the driest is June (0 mm0.0 in).
Relative humidity ranges from 16% in August to 62% in January. The clearest skies (lowest average cloud amount, 27%) are typical of July. Average wind speed near the ground ranges from 8 km/h (5 mph) in November to 11 km/h (7 mph) in July. Daylight lasts from about 9.9 hours in December to 14.4 hours in June.
Best time to visit Ilam
Based on these averages, the most comfortable months for sightseeing and outdoor activities are April and May and October: average highs of 20 °C69 °F to 27 °C81 °F with 15 mm0.6 in to 50 mm2.0 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 8 °C46 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Ilam
- Winter (December–February) — highs 846 to 10 °C50 °F, lows −327 to −1 °C30 °F, about 58 mm2.3 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1559 to 27 °C81 °F, lows 236 to 13 °C55 °F, about 41 mm1.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3493 to 37 °C99 °F, lows 1763 to 21 °C70 °F, about 1 mm0.0 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 1559 to 32 °C90 °F, lows 438 to 17 °C62 °F, about 29 mm1.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How Ilam compares
Compared with Kermanshah, about 96 km to the northeast, Ilam is on average 0.7 °C1.2 °F warmer and receives 12% more precipitation (387 mm15 in vs 346 mm14 in). The difference is largest in October (1.2 °C2.2 °F warmer).
Of the 82 places in Iran covered by World Climates, Ilam is the 48th warmest by annual mean temperature and the 11th wettest by annual precipitation. See all of them on the Iran climate page.
Places in other countries with the most similar temperature and rainfall pattern: Adıyaman (Turkey, Csa), Samarkand (Uzbekistan, BSk) and Siverek (Turkey, Csa).
Nearby places
- Kermanshah 96 km · 15 °C59 °F · 346 mm14 in
- Al-Kut 137 km · 25 °C77 °F · 238 mm9.4 in
- Al Miqdadiyah 142 km · 24 °C75 °F · 282 mm11 in
- Kelar 150 km · 23 °C74 °F · 330 mm13 in
- Baqubah 169 km · 24 °C74 °F · 227 mm9.0 in
- Khorramabad 180 km · 18 °C65 °F · 357 mm14 in
- Baghdad 190 km · 24 °C75 °F · 201 mm7.9 in
- Sanandaj 194 km · 14 °C57 °F · 319 mm13 in
Frequently asked questions
What is the warmest month in Ilam?
July is the warmest month in Ilam, with an average high of 37 °C (99 °F) and an average low of 21 °C (70 °F).
What is the coldest month in Ilam?
January is the coldest month, with an average high of 8 °C (46 °F) and an average low of -3 °C (27 °F).
When does it rain the most in Ilam?
January is the wettest month with about 65 mm (2.6 in) of precipitation; June is the driest with about 0 mm (0.0 in).
What is the best time to visit Ilam?
Judging by long-term averages, the most comfortable months are April and May and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 905 m, while Ilam lies at about 1,403 m. Temperatures on this page were therefore adjusted by −3.2 °C5.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.