Slănic, Romania experiences average highs of 15°C (59°F) and lows of 6°C (43°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 0.8°C (1.4°F) across the available records.
Slănic, Romania Weather & Climate 2026
Monthly climate averages for Slănic, Romania. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.1/10
Best: June, July, August, September
UV Index
4
Low
Temperature 15°C / 6°C
Feels Like 13°C / 4°C
Rainy Days 11
Rainfall 74 mm
Sunshine 9 h
Humidity 75%
Wind Speed 11 km/h
Dew Point 6°C
Snow Days 7 days
Frost Days 14 days
Hottest Month
26°C
August
Avg Low16°C
Rain12days
Coldest Month
-4°C
January
Avg High3°C
Rain7days
Driest Month
7days
January
Avg High3°C
Avg Low-4°C
Windiest Month
12 km/h
May (Gusts 34)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 05:29
Daylight 15.6h
Sunset 21:07
Live conditions—
Slănic on the map · live conditions
Slănic, Romania
- Continent
- Europe
- Country
- Romania
- City
- Slănic
- Population
- 7K
- Coordinates
- 45.25°, 25.93°
Seasonal Breakdown
Spring
Mar–May
Avg High 14°C
Avg Low 4°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 25°C
Avg Low 15°C
Rain 15 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 15°C
Avg Low 7°C
Rain 9 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low -3°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: 3°C / -4°C . Feb: 6°C / -3°C . Mar: 10°C / 0°C . Apr: 15°C / 4°C . May: 18°C / 9°C . Jun: 24°C / 14°C . Jul: 26°C / 16°C . Aug: 26°C / 16°C . Sep: 21°C / 12°C . Oct: 15°C / 6°C . Nov: 9°C / 2°C . Dec: 5°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 45 mm. Feb: 30 mm. Mar: 51 mm. Apr: 76 mm. May: 120 mm. Jun: 128 mm. Jul: 119 mm. Aug: 90 mm. Sep: 49 mm. Oct: 61 mm. Nov: 61 mm. Dec: 54 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 77%. Mar: 73%. Apr: 71%. May: 74%. Jun: 74%. Jul: 71%. Aug: 69%. Sep: 70%. Oct: 77%. Nov: 84%. Dec: 82%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 11 km/h . Feb: 11 km/h . Mar: 12 km/h . Apr: 12 km/h . May: 12 km/h . Jun: 11 km/h . Jul: 10 km/h . Aug: 10 km/h . Sep: 11 km/h . Oct: 10 km/h . Nov: 10 km/h . Dec: 10 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 10h. May: 11h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 8h. Nov: 5h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 5. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 3. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 11 days. Feb: 9 days. Mar: 9 days. Apr: 3 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 5 days. Dec: 9 days.
Climate Trends
Average highs have warmed by 0.8°C (1.4°F) across the available records. Average rainfall is trending drier by about 17 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 27°C | Aug · 26°C |
| Coldest month | Feb 2025 · -7°C | Jan · -4°C |
| Wettest month | May 2025 · 208 mm | Jun · 128 mm |
| Windiest month | Oct 2025 · 12 km/h | May · 12 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Wet June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 3°C / -4°C | 0°C / -8°C | 7days (45 mm) Good | 6h Fair | 78% Humid | 2.1 Moderate | Poor | View Details |
| February | 6°C / -3°C | 3°C / -7°C | 7days (30 mm) Good | 7.1h Good | 77% Humid | 2.9 Moderate | Poor | View Details |
| March | 10°C / 0°C | 7°C / -3°C | 10days (51 mm) Wet | 8.1h Good | 73% Muggy | 3.9 Moderate | Poor | View Details |
| April | 15°C / 4°C | 13°C / 1°C | 12days (76 mm) Wet | 10.1h Excellent | 71% Muggy | 5.2 High | Fair | View Details |
| May | 18°C / 9°C | 18°C / 7°C | 18days (120 mm) Wet | 11.1h Excellent | 74% Muggy | 5.4 High | Wet | View Details |
| June best | 24°C / 14°C | 25°C / 14°C | 18days (128 mm) Wet | 12.6h Excellent | 74% Muggy | 6.7 High | Excellent | View Details |
| July best | 26°C / 16°C | 27°C / 16°C | 16days (119 mm) Wet | 12.7h Excellent | 71% Muggy | 7.1 Very High | Excellent | View Details |
| August best | 26°C / 16°C | 27°C / 16°C | 12days (90 mm) Wet | 12.1h Excellent | 69% Muggy | 6.3 High | Excellent | View Details |
| September best | 21°C / 12°C | 20°C / 10°C | 8days (49 mm) Wet | 10h Excellent | 70% Muggy | 5 Moderate | Excellent | View Details |
| October | 15°C / 6°C | 13°C / 4°C | 8days (61 mm) Wet | 7.7h Good | 77% Humid | 3.4 Moderate | Fair | View Details |
| November | 9°C / 2°C | 6°C / -1°C | 10days (61 mm) Wet | 5.4h Fair | 84% Humid | 2 Low | Poor | View Details |
| December | 5°C / -1°C | 2°C / -5°C | 8days (54 mm) Wet | 5.2h Fair | 82% Humid | 1.5 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Slănic are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Slănic, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Slănic is August, with average daytime highs of 26°C (79°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Slănic 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 Slănic is June, averaging 128mm of precipitation across 18 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Slănic runs through May, June, July, April, with the heaviest rainfall in May. Based on 10-year averages for Slănic.
Slănic receives approximately 108 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Slănic.
The least favorable months to visit Slănic are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Slănic is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Slănic is 75%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Slănic receives snow. Months with snowfall average 7 snow days and 11 cm (4 in) of accumulation, with about 14 frost days during winter.
Average wind speeds in Slănic are 11 km/h (7 mph). The windiest month is May with peak winds reaching 12 km/h (7 mph) (gusts up to 34 km/h / 21 mph).
Slănic averages 4 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in August.
The annual average dew point in Slănic is 6°C (43°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Slănic has a Oceanic climate, classified as Cfb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Slănic ranges from 4°C (39°F) to 13°C (55°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Slănic. It earns a climate score of 8/10 with Excellent.
For June in Slănic, pack Umbrella, Waterproof jacket, Waterproof shoes, Sunscreen (SPF 30+), Sunglasses. With average highs of 24°C (75°F) and 18 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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