Chalus climate
Chalus (Iran) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 21 °C70 °F, and about 799 mm31 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Chalus climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1456 | 542 | 949 | 662.6 |
| Feb | 1559 | 744 | 1151 | 662.6 |
| Mar | 2068 | 1151 | 1560 | 632.5 |
| Apr | 2576 | 1559 | 2067 | 512.0 |
| May | 3086 | 2068 | 2577 | 190.8 |
| Jun | 3493 | 2475 | 2984 | 210.8 |
| Jul | 3697 | 2679 | 3188 | 311.2 |
| Aug | 3697 | 2679 | 3188 | 391.5 |
| Sep | 3391 | 2374 | 2882 | 903.6 |
| Oct | 2781 | 1966 | 2373 | 1435.6 |
| Nov | 2068 | 1254 | 1661 | 1305.1 |
| Dec | 1560 | 846 | 1153 | 803.1 |
| Year | 3697 | 542 | 2170 | 79931 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 80% | 73% | 2.2 | 9:55 |
| Feb | 77% | 77% | 2.7 | 10:48 |
| Mar | 70% | 79% | 3.7 | 11:52 |
| Apr | 68% | 76% | 4.7 | 13:05 |
| May | 64% | 68% | 5.8 | 14:06 |
| Jun | 64% | 62% | 6.5 | 14:39 |
| Jul | 66% | 67% | 6.0 | 14:26 |
| Aug | 65% | 62% | 5.7 | 13:33 |
| Sep | 66% | 63% | 4.6 | 12:22 |
| Oct | 70% | 68% | 3.4 | 11:11 |
| Nov | 77% | 72% | 2.3 | 10:09 |
| Dec | 80% | 72% | 2.0 | 9:40 |
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 Chalus is like
The warmest month is July, with an average high of 36 °C97 °F and a low of 26 °C79 °F. The coldest is January, when highs average 14 °C56 °F and lows 5 °C42 °F. Seasons are strongly marked: the warmest month is on average 21.7 °C39 °F warmer than the coldest.
Annual precipitation is moderate at about 799 mm31 in. The wettest three-month stretch is September–November, which brings 45% of the annual total. Months with less than 20 mm0.8 in on average: May. The wettest month is October (143 mm5.6 in), the driest is May (19 mm0.8 in).
Relative humidity ranges from 64% in June to 80% in January. The clearest skies (lowest average cloud amount, 62%) are typical of June. Average wind speed near the ground ranges from 3 km/h (2 mph) in May to 5 km/h (3 mph) in February. Daylight lasts from about 9.7 hours in December to 14.7 hours in June.
Best time to visit Chalus
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March and April: average highs of 20 °C68 °F to 25 °C76 °F with 51 mm2.0 in to 63 mm2.5 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 36 °C97 °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 Chalus
- Winter (December–February) — highs 1456 to 15 °C60 °F, lows 542 to 8 °C46 °F, about 70 mm2.8 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 2068 to 30 °C86 °F, lows 1151 to 20 °C68 °F, about 45 mm1.8 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
- Summer (June–August) — highs 3493 to 36 °C97 °F, lows 2475 to 26 °C79 °F, about 30 mm1.2 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 2068 to 33 °C91 °F, lows 1254 to 23 °C74 °F, about 121 mm4.8 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
How Chalus compares
Compared with Amol, about 86 km to the east, Chalus is on average 1.4 °C2.5 °F warmer and receives 24% more precipitation (799 mm31 in vs 647 mm25 in). The difference is largest in May (2.3 °C4.2 °F warmer).
Of the 82 places in Iran covered by World Climates, Chalus is the 17th warmest by annual mean temperature and the 3rd 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: Austin (United States, Cfa), San Antonio (United States, Cfa) and College Station (United States, Cfa).
Nearby places
- Amol 86 km · 19 °C67 °F · 647 mm25 in
- Karaj 99 km · 14 °C58 °F · 509 mm20 in
- Nazarabad 107 km · 16 °C60 °F · 426 mm17 in
- Tehran 107 km · 17 °C62 °F · 311 mm12 in
- Qaem Shahr 131 km · 19 °C67 °F · 536 mm21 in
- Qazvin 134 km · 13 °C55 °F · 614 mm24 in
- Qarchak 137 km · 18 °C65 °F · 334 mm13 in
- Lahijan 140 km · 19 °C67 °F · 955 mm38 in
Frequently asked questions
What is the warmest month in Chalus?
July is the warmest month in Chalus, with an average high of 36 °C (97 °F) and an average low of 26 °C (79 °F).
What is the coldest month in Chalus?
January is the coldest month, with an average high of 14 °C (56 °F) and an average low of 5 °C (42 °F).
When does it rain the most in Chalus?
October is the wettest month with about 143 mm (5.6 in) of precipitation; May is the driest with about 19 mm (0.8 in).
What is the best time to visit Chalus?
Judging by long-term averages, the most comfortable months are March and April.
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 1,567 m, while Chalus lies at about 26 m. Temperatures on this page were therefore adjusted by +10 °C18 °F using the standard lapse rate of 6.5 °C per 1,000 m.