Onís, Spain experiences average highs of 17°C (63°F) and lows of 11°C (52°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have warmed by 1.2°C (2.2°F) across the available records.
Onís, Spain Weather & Climate 2026
Monthly climate averages for Onís, Spain. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.4/10
Best: June, July, August, September, October
UV Index
4
Low
Temperature 17°C / 11°C
Feels Like 17°C / 9°C
Rainy Days 14
Rainfall 121 mm
Sunshine 9 h
Humidity 83%
Wind Speed 16 km/h
Dew Point 11°C
Hottest Month
22°C
August
Avg Low17°C
Rain11days
Coldest Month
6°C
January
Avg High12°C
Rain15days
Driest Month
11days
August
Avg High22°C
Avg Low17°C
Windiest Month
18 km/h
November (Gusts 40)
Sea Temperature
14°C – 21°C
Warmest water: August (
21.1°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to frequent rain.
Sun Position
Sunrise 06:40
Daylight 15.4h
Sunset 22:03
Live conditions—
Onís on the map · live conditions
Onís, Spain
- Continent
- Europe
- Country
- Spain
- City
- Onís
- Population
- 837
- Coordinates
- 43.34°, -4.97°
Seasonal Breakdown
Spring
Mar–May
Avg High 15°C
Avg Low 9°C
Rain 15 days/mo
Summer
Jun–Aug
Avg High 21°C
Avg Low 16°C
Rain 13 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 13°C
Rain 14 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 13°C
Avg Low 7°C
Rain 14 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: 12°C / 6°C . Feb: 13°C / 6°C . Mar: 14°C / 7°C . Apr: 15°C / 9°C . May: 17°C / 11°C . Jun: 20°C / 15°C . Jul: 22°C / 16°C . Aug: 22°C / 17°C . Sep: 21°C / 15°C . Oct: 19°C / 13°C . Nov: 15°C / 9°C . Dec: 13°C / 7°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 144 mm. Feb: 118 mm. Mar: 121 mm. Apr: 105 mm. May: 104 mm. Jun: 124 mm. Jul: 65 mm. Aug: 77 mm. Sep: 126 mm. Oct: 124 mm. Nov: 186 mm. Dec: 159 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 81%. Feb: 81%. Mar: 80%. Apr: 81%. May: 83%. Jun: 86%. Jul: 85%. Aug: 85%. Sep: 84%. Oct: 82%. Nov: 82%. Dec: 82%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 18 km/h . Feb: 17 km/h . Mar: 18 km/h . Apr: 16 km/h . May: 16 km/h . Jun: 15 km/h . Jul: 14 km/h . Aug: 15 km/h . Sep: 15 km/h . Oct: 16 km/h . Nov: 18 km/h . Dec: 17 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 8h. Mar: 9h. Apr: 11h. May: 12h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 7h. Dec: 6h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 14°C . Feb: 14°C . Mar: 14°C . Apr: 14°C . May: 16°C . Jun: 19°C . Jul: 21°C . Aug: 21°C . Sep: 20°C . Oct: 19°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 6. 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
Climate Trends
Average highs have warmed by 1.2°C (2.2°F) across the available records. Average rainfall is trending drier by about 28 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 24°C | Aug · 22°C |
| Coldest month | Feb 2025 · 7°C | Jan · 6°C |
| Wettest month | Dec 2025 · 187 mm | Nov · 186 mm |
| Windiest month | Jan 2025 · 19 km/h | Nov · 18 km/h |
Month-by-Month Weather Table
January
Poor 
February
Fair March
Fair April
Good May
Good June best
Good July best
Excellent August best
Excellent September best
Excellent October best
Good November
Wet December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 12°C / 6°C | 9°C / 3°C | 15days (144 mm) Wet | 6.2h Fair | 81% Humid | 2.1 Moderate | Poor | View Details |
| February | 13°C / 6°C | 11°C / 3°C | 13days (118 mm) Wet | 7.5h Good | 81% Humid | 2.8 Moderate | Fair | View Details |
| March | 14°C / 7°C | 12°C / 4°C | 16days (121 mm) Wet | 9.3h Good | 80% Humid | 4.3 Moderate | Fair | View Details |
| April | 15°C / 9°C | 14°C / 7°C | 14days (105 mm) Wet | 10.5h Excellent | 81% Humid | 5.7 High | Good | View Details |
| May | 17°C / 11°C | 18°C / 10°C | 15days (104 mm) Wet | 11.6h Excellent | 83% Humid | 6.4 High | Good | View Details |
| June best | 20°C / 15°C | 21°C / 14°C | 15days (124 mm) Wet | 11.4h Excellent | 86% Very Muggy | 6.3 High | Good | View Details |
| July best | 22°C / 16°C | 24°C / 17°C | 12days (65 mm) Wet | 12.1h Excellent | 85% Humid | 6.8 High | Excellent | View Details |
| August best | 22°C / 17°C | 25°C / 18°C | 11days (77 mm) Wet | 11.4h Excellent | 85% Humid | 6.1 High | Excellent | View Details |
| September best | 21°C / 15°C | 22°C / 15°C | 14days (126 mm) Wet | 10h Excellent | 84% Humid | 5 Moderate | Excellent | View Details |
| October best | 19°C / 13°C | 19°C / 12°C | 13days (124 mm) Wet | 8.3h Good | 82% Humid | 3.6 Moderate | Good | View Details |
| November | 15°C / 9°C | 13°C / 7°C | 16days (186 mm) Wet | 6.8h Fair | 82% Humid | 2.2 Moderate | Wet | View Details |
| December | 13°C / 7°C | 11°C / 5°C | 15days (159 mm) Wet | 5.8h Fair | 82% Humid | 1.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Onís are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Onís, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Onís is August, with average daytime highs of 22°C (72°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Onís is January, with average overnight lows of 6°C (43°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Onís is November, averaging 186mm of precipitation across 16 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Onís runs through March, November, January, May, with the heaviest rainfall in March. Based on 10-year averages for Onís.
Onís receives approximately 111 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Onís.
The least favorable months to visit Onís are January, February, March, December, primarily due to frequent rain. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in Onís is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Onís is 83%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Sea temperatures in Summer average 17°C (63°F), which most swimmers will find too cold without a wetsuit.
Average wind speeds in Onís are 16 km/h (10 mph). The windiest month is November with peak winds reaching 18 km/h (11 mph) (gusts up to 40 km/h / 25 mph).
Onís averages 3 clear-sky days per month with overall cloud cover around 65%. The clearest skies occur in October.
The annual average dew point in Onís is 11°C (52°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Onís 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 Onís ranges from 9°C (48°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 Onís. It earns a climate score of 7.4/10 with Good.
For June in Onís, pack Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 20°C (68°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.
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