Oltza, Spain experiences average highs of 18°C (64°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 0.9°C (1.6°F) across the available records.
Oltza, Spain Weather & Climate 2026
Monthly climate averages for Oltza, 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
6.6/10
Best: June, July, August, September
UV Index
5
Low
Temperature 18°C / 9°C
Feels Like 16°C / 8°C
Rainy Days 10
Rainfall 66 mm
Sunshine 9 h
Humidity 82%
Wind Speed 16 km/h
Dew Point 10°C
Snow Days 2 days
Frost Days 3 days
Hottest Month
27°C
August
Avg Low16°C
Rain6days
Coldest Month
3°C
January
Avg High9°C
Rain12days
Driest Month
4days
July
Avg High25°C
Avg Low16°C
Windiest Month
18 km/h
March (Gusts 44)
Worst Time to Visit
Consider avoiding January, March, November, December due to frequent rain.
Sun Position
Sunrise 06:29
Daylight 15.3h
Sunset 21:48
Live conditions—
Oltza on the map · live conditions
Oltza, Spain
- Continent
- Europe
- Country
- Spain
- City
- Oltza
- Population
- 1.3K
- Coordinates
- 42.85°, -1.77°
Seasonal Breakdown
Spring
Mar–May
Avg High 16°C
Avg Low 7°C
Rain 12 days/mo
Summer
Jun–Aug
Avg High 25°C
Avg Low 15°C
Rain 7 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 11°C
Rain 10 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 11°C
Avg Low 4°C
Rain 11 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: 9°C / 3°C . Feb: 12°C / 4°C . Mar: 13°C / 5°C . Apr: 16°C / 7°C . May: 19°C / 10°C . Jun: 23°C / 14°C . Jul: 25°C / 16°C . Aug: 27°C / 16°C . Sep: 23°C / 14°C . Oct: 19°C / 11°C . Nov: 13°C / 7°C . Dec: 11°C / 4°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 83 mm. Feb: 64 mm. Mar: 82 mm. Apr: 78 mm. May: 63 mm. Jun: 64 mm. Jul: 20 mm. Aug: 40 mm. Sep: 59 mm. Oct: 80 mm. Nov: 90 mm. Dec: 72 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 88%. Feb: 84%. Mar: 81%. Apr: 79%. May: 79%. Jun: 80%. Jul: 79%. Aug: 76%. Sep: 78%. Oct: 81%. Nov: 87%. Dec: 89%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 16 km/h . Mar: 18 km/h . Apr: 18 km/h . May: 17 km/h . Jun: 16 km/h . Jul: 18 km/h . Aug: 17 km/h . Sep: 16 km/h . Oct: 16 km/h . Nov: 16 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 9h. Apr: 10h. May: 12h. Jun: 12h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 8h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 6. May: UV 7. Jun: UV 7. Jul: UV 8. Aug: UV 7. 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: 4 days. Feb: 3 days. Mar: 3 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 2 days.
Climate Trends
Average highs have warmed by 0.9°C (1.6°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 · 28°C | Aug · 27°C |
| Coldest month | Jan 2025 · 3°C | Jan · 3°C |
| Wettest month | Apr 2025 · 109 mm | Nov · 90 mm |
| Windiest month | Mar 2025 · 21 km/h | Mar · 18 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Fair April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Fair December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 3°C | 6°C / 0°C | 12days (83 mm) Wet | 6.3h Fair | 88% Very Muggy | 2 Low | Poor | View Details |
| February | 12°C / 4°C | 9°C / 1°C | 9days (64 mm) Wet | 7.4h Good | 84% Humid | 3 Moderate | Fair | View Details |
| March | 13°C / 5°C | 10°C / 2°C | 14days (82 mm) Wet | 8.9h Good | 81% Humid | 4.1 Moderate | Fair | View Details |
| April | 16°C / 7°C | 14°C / 5°C | 12days (78 mm) Wet | 10.2h Excellent | 79% Humid | 5.5 High | Fair | View Details |
| May | 19°C / 10°C | 19°C / 9°C | 11days (63 mm) Wet | 11.5h Excellent | 79% Humid | 6.6 High | Good | View Details |
| June best | 23°C / 14°C | 25°C / 14°C | 11days (64 mm) Wet | 12.3h Excellent | 80% Humid | 7.2 Very High | Excellent | View Details |
| July best | 25°C / 16°C | 27°C / 16°C | 4days (20 mm) Good | 12.7h Excellent | 79% Humid | 7.5 Very High | Excellent | View Details |
| August best | 27°C / 16°C | 28°C / 17°C | 6days (40 mm) Good | 11.9h Excellent | 76% Humid | 6.8 High | Excellent | View Details |
| September best | 23°C / 14°C | 23°C / 14°C | 8days (59 mm) Wet | 10.1h Excellent | 78% Humid | 5.3 High | Excellent | View Details |
| October | 19°C / 11°C | 18°C / 10°C | 9days (80 mm) Wet | 8.2h Good | 81% Humid | 3.6 Moderate | Good | View Details |
| November | 13°C / 7°C | 11°C / 4°C | 14days (90 mm) Wet | 6.5h Fair | 87% Very Muggy | 2.3 Moderate | Fair | View Details |
| December | 11°C / 4°C | 9°C / 2°C | 11days (72 mm) Wet | 6.2h Fair | 89% Very Muggy | 1.7 Low | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Oltza are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Oltza, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Oltza is August, with average daytime highs of 27°C (80°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Oltza is January, with average overnight lows of 3°C (37°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Oltza is November, averaging 90mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Oltza runs through March, November, January, April, with the heaviest rainfall in March. Based on 10-year averages for Oltza.
Oltza receives approximately 112 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Oltza.
The least favorable months to visit Oltza are January, March, November, December, primarily due to frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Oltza is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Oltza is 82%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes, Oltza receives snow. Months with snowfall average 2 snow days and 4 cm (2 in) of accumulation, with about 3 frost days during winter.
Average wind speeds in Oltza are 16 km/h (10 mph). The windiest month is March with peak winds reaching 18 km/h (11 mph) (gusts up to 44 km/h / 27 mph).
Oltza averages 2 clear-sky days per month with overall cloud cover around 63%. The clearest skies occur in February.
The annual average dew point in Oltza is 10°C (50°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Oltza has a Warm-Summer Mediterranean climate, classified as Csb 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 Oltza ranges from 8°C (46°F) to 16°C (61°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 Oltza. It earns a climate score of 8.5/10 with Excellent.
For June in Oltza, pack Umbrella, Waterproof jacket, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 23°C (74°F) and 11 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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