Karaj, Iran experiences average highs of 21°C (70°F) and lows of 8°C (46°F) throughout the year. The climate is relatively dry, with only 4 rainy days per month on average. Sunshine is abundant, averaging about 11 hours per day. Average highs have warmed by 1.2°C (2.2°F) across the available records.
Karaj, Iran Weather & Climate 2026
Monthly climate averages for Karaj, Iran. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.6/10
Best: May, June, August, September, October
UV Index
6
High
Temperature 21°C / 8°C
Feels Like 19°C / 5°C
Rainy Days 4
Rainfall 21 mm
Sunshine 11 h
Humidity 43%
Wind Speed 12 km/h
Dew Point 1°C
Snow Days 3 days
Frost Days 17 days
Hottest Month
36°C
July
Avg Low21°C
Rain0days
Coldest Month
-4°C
January
Avg High7°C
Rain7days
Driest Month
0days
July
Avg High36°C
Avg Low21°C
Windiest Month
15 km/h
May (Gusts 38)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures.
Sun Position
Sunrise 04:51
Daylight 14.6h
Sunset 19:25
Live conditions—
Karaj on the map · live conditions
Karaj, Iran
- Continent
- Asia
- Country
- Iran
- City
- Karaj
- Population
- 1.4M
- Coordinates
- 35.83°, 50.99°
Seasonal Breakdown
Spring
Mar–May
Avg High 20°C
Avg Low 7°C
Rain 6 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 34°C
Avg Low 20°C
Rain 0 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 22°C
Avg Low 9°C
Rain 2 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low -4°C
Rain 7 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 7°C / -4°C . Feb: 8°C / -4°C . Mar: 14°C / 1°C . Apr: 20°C / 6°C . May: 27°C / 12°C . Jun: 33°C / 18°C . Jul: 36°C / 21°C . Aug: 34°C / 21°C . Sep: 30°C / 16°C . Oct: 22°C / 9°C . Nov: 14°C / 2°C . Dec: 9°C / -2°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 38 mm. Feb: 43 mm. Mar: 47 mm. Apr: 36 mm. May: 17 mm. Jun: 3 mm. Jul: 1 mm. Aug: 0 mm. Sep: 3 mm. Oct: 12 mm. Nov: 25 mm. Dec: 31 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 58%. Feb: 61%. Mar: 57%. Apr: 47%. May: 36%. Jun: 25%. Jul: 25%. Aug: 24%. Sep: 28%. Oct: 39%. Nov: 54%. Dec: 60%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 10 km/h . Feb: 11 km/h . Mar: 13 km/h . Apr: 13 km/h . May: 15 km/h . Jun: 15 km/h . Jul: 15 km/h . Aug: 13 km/h . Sep: 13 km/h . Oct: 11 km/h . Nov: 10 km/h . Dec: 9 km/h .
Sunshine
Sunshine
Sunshine: Jan: 9h. Feb: 9h. Mar: 10h. Apr: 11h. May: 12h. Jun: 13h. Jul: 13h. Aug: 13h. Sep: 11h. Oct: 10h. Nov: 9h. Dec: 8h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 5. Mar: UV 6. Apr: UV 7. May: UV 8. Jun: UV 9. Jul: UV 9. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 6 days. Feb: 5 days. Mar: 1 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 3 days.
Climate Trends
Average highs have warmed by 1.2°C (2.2°F) across the available records. Average rainfall is trending drier by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 36°C | Jul · 36°C |
| Coldest month | Feb 2025 · -6°C | Jan · -4°C |
| Wettest month | Dec 2025 · 34 mm | Mar · 47 mm |
| Windiest month | May 2025 · 16 km/h | May · 15 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July
Good August best
Excellent September best
Excellent October best
Excellent November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 7°C / -4°C | 3°C / -9°C | 7days (38 mm) Good | 8.5h Good | 58% Moderate | 3.4 Moderate | Poor | View Details |
| February | 8°C / -4°C | 5°C / -8°C | 8days (43 mm) Wet | 9.1h Good | 61% Muggy | 4.5 Moderate | Poor | View Details |
| March | 14°C / 1°C | 12°C / -2°C | 8days (47 mm) Wet | 9.8h Good | 57% Moderate | 5.8 High | Fair | View Details |
| April | 20°C / 6°C | 19°C / 3°C | 6days (36 mm) Good | 11.1h Excellent | 47% Moderate | 7.4 Very High | Good | View Details |
| May best | 27°C / 12°C | 25°C / 9°C | 4days (17 mm) Good | 12.3h Excellent | 36% Comfortable | 8 Very High | Excellent | View Details |
| June best | 33°C / 18°C | 31°C / 15°C | 1days (3 mm) Excellent | 12.9h Excellent | 25% Comfortable | 8.6 Very High | Excellent | View Details |
| July | 36°C / 21°C | 34°C / 19°C | 0days (1 mm) Excellent | 13h Excellent | 25% Comfortable | 8.6 Very High | Good | View Details |
| August best | 34°C / 21°C | 33°C / 18°C | 0days (0 mm) Excellent | 12.5h Excellent | 24% Comfortable | 8.1 Very High | Excellent | View Details |
| September best | 30°C / 16°C | 28°C / 13°C | 0days (3 mm) Excellent | 11.1h Excellent | 28% Comfortable | 7 High | Excellent | View Details |
| October best | 22°C / 9°C | 20°C / 7°C | 2days (12 mm) Excellent | 10.1h Excellent | 39% Comfortable | 5.6 High | Excellent | View Details |
| November | 14°C / 2°C | 11°C / -1°C | 5days (25 mm) Good | 8.6h Good | 54% Moderate | 4 Moderate | Fair | View Details |
| December | 9°C / -2°C | 6°C / -6°C | 6days (31 mm) Good | 8.1h Good | 60% Moderate | 3.2 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Karaj are May, June, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Karaj, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Karaj is July, with average daytime highs of 36°C (96°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Karaj is January, with average overnight lows of -4°C (24°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Karaj is March, averaging 47mm of precipitation across 8 rainy days. An umbrella or waterproof jacket is essential.
Karaj receives approximately 127 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Karaj.
The least favorable months to visit Karaj are January, February, December, primarily due to very cold temperatures. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Karaj is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Karaj is 43%, classified as dry. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Karaj receives snow. Months with snowfall average 3 snow days and 5 cm (2 in) of accumulation, with about 17 frost days during winter.
Average wind speeds in Karaj are 12 km/h (7 mph). The windiest month is May with peak winds reaching 15 km/h (9 mph) (gusts up to 38 km/h / 23 mph).
Karaj averages 17 clear-sky days per month with overall cloud cover around 26%. The clearest skies occur in August.
The annual average dew point in Karaj is 1°C (34°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Karaj has a Cold Semi-Arid climate, classified as BSk under the Köppen system. Arid climates have very low rainfall relative to temperature, with large swings between daytime heat and cool nights.
The 'feels like' temperature in Karaj ranges from 5°C (41°F) to 19°C (66°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Karaj. It earns a climate score of 9.3/10 with Excellent.
For June in Karaj, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Sandals. With average highs of 33°C (91°F) and 1 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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