Hernani, Spain experiences average highs of 17°C (63°F) and lows of 12°C (54°F) throughout the year. Rainfall is frequent, averaging about 15 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.
Hernani, Spain Weather & Climate 2026
Monthly climate averages for Hernani, Spain. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Dec 
Wetter season: Jan–Nov At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.5/10
Best: June, July, August, September
UV Index
4
Low
Temperature 17°C / 12°C
Feels Like 17°C / 10°C
Rainy Days 15
Rainfall 125 mm
Sunshine 9 h
Humidity 79%
Wind Speed 18 km/h
Dew Point 11°C
Snow Days 2 days
Frost Days 1 days
Hottest Month
24°C
August
Avg Low18°C
Rain12days
Coldest Month
6°C
January
Avg High11°C
Rain16days
Driest Month
12days
August
Avg High24°C
Avg Low18°C
Windiest Month
21 km/h
November (Gusts 45)
Sea Temperature
13°C – 23°C
Warmest water: August (
23.3°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to heavy rainfall.
Sun Position
Sunrise 06:29
Daylight 15.4h
Sunset 21:51
Live conditions—
Hernani on the map · live conditions
Hernani, Spain
- Continent
- Europe
- Country
- Spain
- City
- Hernani
- Population
- 20.2K
- Elevation
- 42 m
- Coordinates
- 43.27°, -1.98°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 10°C
Rain 16 days/mo
Summer
Jun–Aug
Avg High 22°C
Avg Low 17°C
Rain 13 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 19°C
Avg Low 13°C
Rain 14 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 12°C
Avg Low 7°C
Rain 15 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: 11°C / 6°C . Feb: 13°C / 7°C . Mar: 14°C / 8°C . Apr: 16°C / 10°C . May: 18°C / 12°C . Jun: 21°C / 16°C . Jul: 23°C / 17°C . Aug: 24°C / 18°C . Sep: 22°C / 16°C . Oct: 20°C / 14°C . Nov: 15°C / 10°C . Dec: 13°C / 8°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 164 mm. Feb: 123 mm. Mar: 127 mm. Apr: 105 mm. May: 110 mm. Jun: 121 mm. Jul: 68 mm. Aug: 91 mm. Sep: 115 mm. Oct: 126 mm. Nov: 189 mm. Dec: 160 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 80%. Feb: 78%. Mar: 75%. Apr: 76%. May: 80%. Jun: 83%. Jul: 81%. Aug: 81%. Sep: 79%. Oct: 78%. Nov: 79%. Dec: 80%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 20 km/h . Feb: 20 km/h . Mar: 21 km/h . Apr: 18 km/h . May: 17 km/h . Jun: 16 km/h . Jul: 15 km/h . Aug: 16 km/h . Sep: 16 km/h . Oct: 18 km/h . Nov: 21 km/h . Dec: 21 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 9h. Apr: 10h. May: 11h. Jun: 11h. Jul: 11h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 6h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 14°C . Feb: 13°C . Mar: 13°C . Apr: 15°C . May: 17°C . Jun: 21°C . Jul: 23°C . Aug: 23°C . Sep: 22°C . Oct: 20°C . Nov: 17°C . Dec: 15°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 6. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. 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: 2 days. Feb: 2 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: 0 days. Dec: 1 days.
Climate Trends
Average highs have warmed by 0.8°C (1.4°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 | Aug 2025 · 25°C | Aug · 24°C |
| Coldest month | Jan 2025 · 7°C | Jan · 6°C |
| Wettest month | Nov 2025 · 198 mm | Nov · 189 mm |
| Windiest month | Jan 2025 · 23 km/h | Nov · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Fair April
Good May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Wet December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 11°C / 6°C | 8°C / 3°C | 16days (164 mm) Wet | 5.6h Fair | 80% Humid | 1.9 Low | Poor | View Details |
| February | 13°C / 7°C | 10°C / 4°C | 14days (123 mm) Wet | 7h Good | 78% Humid | 2.8 Moderate | Fair | View Details |
| March | 14°C / 8°C | 11°C / 5°C | 17days (127 mm) Wet | 8.5h Good | 75% Muggy | 4.2 Moderate | Fair | View Details |
| April | 16°C / 10°C | 14°C / 7°C | 15days (105 mm) Wet | 9.7h Good | 76% Humid | 5.6 High | Good | View Details |
| May | 18°C / 12°C | 18°C / 11°C | 17days (110 mm) Wet | 10.7h Excellent | 80% Humid | 6.3 High | Good | View Details |
| June best | 21°C / 16°C | 23°C / 16°C | 15days (121 mm) Wet | 10.6h Excellent | 83% Humid | 6.5 High | Excellent | View Details |
| July best | 23°C / 17°C | 25°C / 18°C | 13days (68 mm) Wet | 11.2h Excellent | 81% Humid | 6.6 High | Excellent | View Details |
| August best | 24°C / 18°C | 26°C / 19°C | 12days (91 mm) Wet | 10.8h Excellent | 81% Humid | 6.1 High | Excellent | View Details |
| September best | 22°C / 16°C | 23°C / 16°C | 13days (115 mm) Wet | 9.6h Good | 79% Humid | 4.9 Moderate | Excellent | View Details |
| October | 20°C / 14°C | 19°C / 13°C | 12days (126 mm) Wet | 7.7h Good | 78% Humid | 3.5 Moderate | Good | View Details |
| November | 15°C / 10°C | 13°C / 7°C | 17days (189 mm) Wet | 6.1h Fair | 79% Humid | 2.1 Moderate | Wet | View Details |
| December | 13°C / 8°C | 10°C / 5°C | 15days (160 mm) Wet | 5.6h Fair | 80% Humid | 1.6 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Hernani are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Hernani, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Hernani is August, with average daytime highs of 24°C (74°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Hernani is January, with average overnight lows of 6°C (44°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Hernani is November, averaging 189mm of precipitation across 17 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Hernani runs through March, May, November, January, with the heaviest rainfall in March. Based on 10-year averages for Hernani.
Hernani receives approximately 103 sunshine hours per year. The sunniest month is July with around 11 hours. Based on climate data for Hernani.
The least favorable months to visit Hernani are January, February, March, December, primarily due to heavy rainfall. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Hernani is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Hernani is 79%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in July, August average 23°C (73°F), which is warm and comfortable for swimming and water activities.
Yes, Hernani receives snow. Months with snowfall average 2 snow days and 1 cm (0 in) of accumulation, with about 1 frost days during winter.
Average wind speeds in Hernani are 18 km/h (11 mph). The windiest month is November with peak winds reaching 21 km/h (13 mph) (gusts up to 45 km/h / 28 mph).
Hernani averages 2 clear-sky days per month with overall cloud cover around 65%. The clearest skies occur in February.
The annual average dew point in Hernani is 11°C (52°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Hernani 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 Hernani ranges from 10°C (50°F) to 17°C (63°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 Hernani. It earns a climate score of 8/10 with Excellent.
For June in Hernani, pack Umbrella, Waterproof jacket, Waterproof shoes, Sunscreen (SPF 30+), Sunglasses. With average highs of 21°C (70°F) and 15 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.
Last updated: