Sīn, Iran experiences average highs of 23°C (73°F) and lows of 9°C (48°F) throughout the year. The climate is relatively dry, with only 2 rainy days per month on average. Sunshine is abundant, averaging about 11 hours per day. Average highs have warmed by 0.6°C (1.1°F) across the available records.
Sīn, Iran Weather & Climate 2026
Monthly climate averages for Sīn, Iran. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Oct 
Wetter season: Feb–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
7.2/10
Best: May, June, August, September, October
UV Index
6
High
Temperature 23°C / 9°C
Feels Like 21°C / 6°C
Rainy Days 2
Rainfall 8 mm
Sunshine 11 h
Humidity 33%
Wind Speed 14 km/h
Dew Point -2°C
Snow Days 2 days
Frost Days 13 days
Hottest Month
37°C
July
Avg Low 21°C
Rain 0 days
Coldest Month
-2°C
January
Avg High 10°C
Rain 2 days
Driest Month
0 days
June
Avg High 35°C
Avg Low 19°C
Windiest Month
18 km/h
April (Gusts 37)
Worst Time to Visit
Consider avoiding January, February, December due to less favorable weather conditions.
Sun Position
Sunrise 04:55
Daylight 14.3h
Sunset 19:13
Live conditions —
Sīn on the map · live conditions
Sīn, Iran
- Continent
- Asia
- Country
- Iran
- City
- Sīn
- Population
- 5.5K
- Coordinates
- 32.85°, 51.66°
Seasonal Breakdown
Spring
Mar–May
Avg High 23°C
Avg Low 9°C
Rain 3 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 35°C
Avg Low 20°C
Rain 0 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 24°C
Avg Low 10°C
Rain 1 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 11°C
Avg Low -1°C
Rain 3 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 10°C / -2°C . Feb: 13°C / 0°C . Mar: 18°C / 4°C . Apr: 23°C / 9°C . May: 29°C / 14°C . Jun: 35°C / 19°C . Jul: 37°C / 21°C . Aug: 35°C / 19°C . Sep: 31°C / 16°C . Oct: 24°C / 10°C . Nov: 16°C / 4°C . Dec: 11°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 10 mm. Feb: 15 mm. Mar: 15 mm. Apr: 12 mm. May: 7 mm. Jun: 1 mm. Jul: 1 mm. Aug: 0 mm. Sep: 0 mm. Oct: 2 mm. Nov: 16 mm. Dec: 14 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 47%. Feb: 43%. Mar: 40%. Apr: 34%. May: 27%. Jun: 16%. Jul: 17%. Aug: 17%. Sep: 19%. Oct: 29%. Nov: 49%. Dec: 54%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 11 km/h . Feb: 14 km/h . Mar: 17 km/h . Apr: 18 km/h . May: 18 km/h . Jun: 16 km/h . Jul: 16 km/h . Aug: 15 km/h . Sep: 13 km/h . Oct: 12 km/h . Nov: 9 km/h . Dec: 9 km/h .
Sunshine
Sunshine
Sunshine: Jan: 9h. Feb: 10h. Mar: 10h. Apr: 11h. May: 13h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 11h. Oct: 10h. Nov: 9h. Dec: 9h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 4. Feb: UV 5. Mar: UV 6. Apr: UV 7. May: UV 8. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 6. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow Days Snowfall
Snow Days: Jan: 2 days. Feb: 2 days. Mar: 0 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have warmed by 0.6°C (1.1°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 37°C | Jul · 37°C |
| Coldest month | Jan 2025 · -2°C | Jan · -2°C |
| Wettest month | Dec 2025 · 51 mm | Nov · 16 mm |
| Windiest month | Apr 2025 · 20 km/h | Apr · 18 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair 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 | 10°C / -2°C | 5°C / -6°C | 2days (10 mm) Excellent | 8.9h Good | 47% Moderate | 3.7 Moderate | Poor | View Details |
| February | 13°C / 0°C | 9°C / -4°C | 3days (15 mm) Excellent | 9.6h Good | 43% Moderate | 4.8 Moderate | Fair | View Details |
| March | 18°C / 4°C | 14°C / 0°C | 3days (15 mm) Excellent | 10.3h Excellent | 40% Comfortable | 6 High | Fair | View Details |
| April | 23°C / 9°C | 21°C / 6°C | 4days (12 mm) Good | 11.2h Excellent | 34% Comfortable | 7.2 Very High | Good | View Details |
| May best | 29°C / 14°C | 27°C / 11°C | 2days (7 mm) Excellent | 12.5h Excellent | 27% Comfortable | 7.8 Very High | Excellent | View Details |
| June best | 35°C / 19°C | 33°C / 16°C | 0days (1 mm) Excellent | 12.9h Excellent | 16% Comfortable | 8.2 Very High | Excellent | View Details |
| July | 37°C / 21°C | 35°C / 19°C | 0days (1 mm) Excellent | 12.9h Excellent | 17% Comfortable | 8.2 Very High | Good | View Details |
| August best | 35°C / 19°C | 33°C / 17°C | 0days (0 mm) Excellent | 12.3h Excellent | 17% Comfortable | 7.9 Very High | Excellent | View Details |
| September best | 31°C / 16°C | 29°C / 13°C | 0days (0 mm) Excellent | 11.1h Excellent | 19% Comfortable | 7 High | Excellent | View Details |
| October best | 24°C / 10°C | 22°C / 7°C | 0days (2 mm) Excellent | 10.3h Excellent | 29% Comfortable | 5.6 High | Excellent | View Details |
| November | 16°C / 4°C | 12°C / 1°C | 3days (16 mm) Excellent | 8.9h Good | 49% Moderate | 4.2 Moderate | Fair | View Details |
| December | 11°C / 0°C | 7°C / -3°C | 3days (14 mm) Excellent | 8.6h Good | 54% Moderate | 3.4 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Sīn 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 Sīn, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Sīn is July, with average daytime highs of 37°C (98°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Sīn is January, with average overnight lows of -2°C (29°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Sīn is November, averaging 16mm of precipitation across 3 rainy days. An umbrella or waterproof jacket is essential.
Sīn receives approximately 130 sunshine hours per year. The sunniest month is June with around 13 hours. Based on climate data for Sīn.
The least favorable months to visit Sīn are January, February, December, primarily due to less favorable weather conditions. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Sīn is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Sīn is 33%, classified as dry. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Sīn receives snow. Months with snowfall average 2 snow days and 2 cm (1 in) of accumulation, with about 13 frost days during winter.
Average wind speeds in Sīn are 14 km/h (9 mph). The windiest month is April with peak winds reaching 18 km/h (11 mph) (gusts up to 37 km/h / 23 mph).
Sīn averages 18 clear-sky days per month with overall cloud cover around 22%. The clearest skies occur in September.
The annual average dew point in Sīn is -2°C (28°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Sīn has a Cold Desert climate, classified as BWk 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 Sīn ranges from 6°C (43°F) to 21°C (70°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 Sīn. It earns a climate score of 9.3/10 with Excellent.
For June in Sīn, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Sandals. With average highs of 35°C (94°F) and 0 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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