Best time to visit Karaj
The best time to visit Karaj is April–May and September–October, judged on twenty years of weather records and the events worth going for.
Karaj, Alborz Province, Iran
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 5.9 °C / 43 °F | -3.4 °C / 26 °F | 36 mm / 1.4 in | neither best nor good |
| February | 7.9 °C / 46 °F | -1.6 °C / 29 °F | 42 mm / 1.6 in | neither best nor good |
| March | 13.8 °C / 57 °F | 3.7 °C / 39 °F | 43 mm / 1.7 in | good month |
| April | 19.8 °C / 68 °F | 9 °C / 48 °F | 35 mm / 1.4 in | best month |
| May | 26.4 °C / 80 °F | 14.8 °C / 59 °F | 14 mm / 0.6 in | best month |
| June | 33 °C / 91 °F | 19.6 °C / 67 °F | 3 mm / 0.1 in | good month |
| July | 35.7 °C / 96 °F | 22.3 °C / 72 °F | 1 mm / 0.1 in | neither best nor good |
| August | 34.2 °C / 94 °F | 21 °C / 70 °F | 2 mm / 0.1 in | neither best nor good |
| September | 29.8 °C / 86 °F | 16.7 °C / 62 °F | 2 mm / 0.1 in | best month |
| October | 22.4 °C / 72 °F | 10.8 °C / 51 °F | 17 mm / 0.6 in | best month |
| November | 13.2 °C / 56 °F | 3.7 °C / 39 °F | 32 mm / 1.3 in | good month |
| December | 8 °C / 46 °F | -1.2 °C / 30 °F | 32 mm / 1.2 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: good
- AApril: best
- MMay: best
- JJune: good
- JJuly: neither
- AAugust: neither
- SSeptember: best
- OOctober: best
- NNovember: good
- DDecember: neither
- Best
- April–May, September–October
- Good
- March, June, November
Why these months
March · good
In its favour: precipitation 43 mm / 1.7 in, share of daylight that is sunny 87%, days with heavy rain 0.9 days, wet days 8.4 days, average daily high 13.8 °C / 57 °F, relative humidity 53%.
Against: feels like (high) 11 °C / 52 °F, average daily low 3.7 °C / 39 °F.
April · best
In its favour: feels like (high) 17.6 °C / 64 °F, average daily high 19.8 °C / 68 °F, precipitation 35 mm / 1.4 in, share of daylight that is sunny 89%, days with heavy rain 0.7 days, wet days 6.7 days, relative humidity 45%, average daily low 9 °C / 48 °F.
May · best
In its favour: feels like (high) 24.2 °C / 76 °F, precipitation 14 mm / 0.6 in, share of daylight that is sunny 87%, average daily high 26.4 °C / 80 °F, wet days 3.4 days, days with heavy rain 0.3 days, average daily low 14.8 °C / 59 °F, relative humidity 33%.
June · good
In its favour: precipitation 3 mm / 0.1 in, share of daylight that is sunny 90%, wet days 0.6 days, days with heavy rain 0 days, average daily low 19.6 °C / 67 °F.
Against: average daily high 33 °C / 91 °F, feels like (high) 30.9 °C / 88 °F, relative humidity 24%.
September · best
In its favour: feels like (high) 27.4 °C / 81 °F, precipitation 2 mm / 0.1 in, share of daylight that is sunny 92%, wet days 0.3 days, days with heavy rain 0.1 days, average daily low 16.7 °C / 62 °F, relative humidity 27%.
Against: average daily high 29.8 °C / 86 °F.
October · best
In its favour: feels like (high) 19.5 °C / 67 °F, average daily high 22.4 °C / 72 °F, precipitation 17 mm / 0.6 in, share of daylight that is sunny 93%, wet days 3.2 days, days with heavy rain 0.3 days, average daily low 10.8 °C / 51 °F, relative humidity 38%.
November · good
In its favour: precipitation 32 mm / 1.3 in, share of daylight that is sunny 85%, days with heavy rain 0.9 days, wet days 6.5 days, average daily high 13.2 °C / 56 °F, relative humidity 57%.
Against: feels like (high) 10.2 °C / 50 °F, average daily low 3.7 °C / 39 °F.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: good
- MMarch: best
- AApril: best
- MMay: best
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: best
- NNovember: best
- DDecember: good
- Best
- March–May, October–November
- Good
- February, December
Why these months
February · good
In its favour: precipitation 42 mm / 1.6 in, days with heavy rain 1.1 days, wet days 8.2 days, average daily high 7.9 °C / 46 °F, share of daylight that is sunny 88%, daylight per day 10.9 h, wind (daily max) 11 km/h / 7 mph.
Against: feels like (high) 4.6 °C / 40 °F, average daily low -1.6 °C / 29 °F.
March · best
In its favour: average daily high 13.8 °C / 57 °F, precipitation 43 mm / 1.7 in, days with heavy rain 0.9 days, wet days 8.4 days, feels like (high) 11 °C / 52 °F, share of daylight that is sunny 87%, daylight per day 12 h, average daily low 3.7 °C / 39 °F, wind (daily max) 13 km/h / 8 mph.
April · best
In its favour: average daily high 19.8 °C / 68 °F, precipitation 35 mm / 1.4 in, wet days 6.7 days, days with heavy rain 0.7 days, feels like (high) 17.6 °C / 64 °F, average daily low 9 °C / 48 °F, share of daylight that is sunny 89%, daylight per day 13.1 h, wind (daily max) 13 km/h / 8 mph.
May · best
In its favour: precipitation 14 mm / 0.6 in, wet days 3.4 days, days with heavy rain 0.3 days, share of daylight that is sunny 87%, daylight per day 14.1 h, average daily low 14.8 °C / 59 °F, feels like (high) 24.2 °C / 76 °F, wind (daily max) 15 km/h / 9 mph.
Against: average daily high 26.4 °C / 80 °F.
October · best
In its favour: average daily high 22.4 °C / 72 °F, precipitation 17 mm / 0.6 in, wet days 3.2 days, days with heavy rain 0.3 days, feels like (high) 19.5 °C / 67 °F, average daily low 10.8 °C / 51 °F, share of daylight that is sunny 93%, daylight per day 11.3 h, wind (daily max) 12 km/h / 7 mph.
November · best
In its favour: average daily high 13.2 °C / 56 °F, precipitation 32 mm / 1.3 in, wet days 6.5 days, days with heavy rain 0.9 days, share of daylight that is sunny 85%, average daily low 3.7 °C / 39 °F, feels like (high) 10.2 °C / 50 °F, wind (daily max) 10 km/h / 6 mph, daylight per day 10.3 h.
December · good
In its favour: precipitation 32 mm / 1.2 in, wet days 6 days, days with heavy rain 0.6 days, average daily high 8 °C / 46 °F, share of daylight that is sunny 85%, wind (daily max) 9 km/h / 6 mph.
Against: feels like (high) 4.6 °C / 40 °F, daylight per day 9.8 h, average daily low -1.2 °C / 30 °F.
Skiing and snow
Wants cold and snowfall; sunshine barely matters.
- JJanuary: good
- FFebruary: good
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: neither
- AAugust: neither
- SSeptember: neither
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- January–February
Why these months
January · good
In its favour: average daily low -3.4 °C / 26 °F, days with snow 6.4 days, wind (daily max) 9 km/h / 6 mph, daylight per day 10 h.
Against: snowfall 10 cm / 4.1 in, average daily high 5.9 °C / 43 °F.
February · good
In its favour: average daily low -1.6 °C / 29 °F, days with snow 5.8 days, wind (daily max) 11 km/h / 7 mph, daylight per day 10.9 h.
Against: snowfall 8 cm / 3.2 in, average daily high 7.9 °C / 46 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Khor, 18 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 2.4 °C | 4.6 °C | 11 °C | 17.6 °C | 24.2 °C | 30.9 °C | 33.8 °C | 32.3 °C | 27.4 °C | 19.5 °C | 10.2 °C | 4.6 °C |
| Days with heavy rain | 0.7 days | 1.1 days | 0.9 days | 0.7 days | 0.3 days | 0 days | 0 days | 0.1 days | 0.1 days | 0.3 days | 0.9 days | 0.6 days |
| Time rain usually falls | 9 pm | 3 am | 2 pm | 3 pm | 4 pm | 4 pm | 5 pm | 9 am | 12 pm | 8 pm | 8 pm | 2 am |
| Sunshine per day | 8.9 h | 9.6 h | 10.4 h | 11.7 h | 12.3 h | 13.1 h | 13.2 h | 12.9 h | 11.4 h | 10.4 h | 8.8 h | 8.3 h |
| Relative humidity | 60% | 61% | 53% | 45% | 33% | 24% | 24% | 24% | 27% | 38% | 57% | 61% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 19.5 µg/m³ | 17 µg/m³ | 19.5 µg/m³ | 16.4 µg/m³ | 15.2 µg/m³ | 14.9 µg/m³ | 17.9 µg/m³ | 14.5 µg/m³ | 14.1 µg/m³ | 16.3 µg/m³ | 19.4 µg/m³ | 19.9 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 37 µg/m³ | 32.1 µg/m³ | 33.1 µg/m³ | 25.9 µg/m³ | 23.2 µg/m³ | 21.9 µg/m³ | 25.5 µg/m³ | 21.4 µg/m³ | 21.2 µg/m³ | 27 µg/m³ | 36.2 µg/m³ | 38.9 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.