May could be a good time to visit San Sebastian, as the weather is generally fine. The average high temperature is around +19°C, and there are typically 4 sunny days in May. However, expect about 20 rainy days, and total monthly rainfall of approximately 130 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+19°C
Avg. max. temperature
+4°C
Min.
+36°C
Max.
130 mm
Total precipitation
78%
Avg. humidity
2 m/s
Avg. wind
4 ☀️
Sunny Days
6 ⛅️
Cloudy
20 🌦
Rainy
Our opinion: San Sebastian has OK weather in May.
Avionero – A better way to search for flights:
Cheapest prices on the market!
Check all your dates and date combinations in a single search!
Want inspiration, set your dates and find the cheapest destinations!
Saves your searches in the browser so you can easily return to them!
Average temperature in San Sebastian in May
Here are the expected maximum, average and minimum temperatures in San Sebastian for May based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in May is +19°C with a maximum of +28°C and a minimum of +9°C.
The average maximum temperature goes up 16% by the end of the month, compared with the beginning of the month, from +17°C to +20°C.
Is San Sebastian warm or cold in May?
San Sebastian is typically mild in May.
Maximum temperatures go up compared to the previous month from +16°C to +19°C. The minimum temperature also goes up from +10°C to +12°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how May is compared to other months in San Sebastian:
Water temperature in San Sebastian in May
Water in San Sebastian in May is Fresh. It varies from +14°C to +19°C, with an average of +16°C.This is almost similar to the air temperature, which averages +19°C.
In May, water temperatures are average relative to the rest of the year:
The warmest water temperatures in San Sebastian are reached in August, when the average sea temperature rises to +21°C. The coldest water temperatures are in February, with an average of +12°C.
Can you swim in San Sebastian in May?
Water temperature (+16°C) in San Sebastian in May might be suited for short swims and acclimatized swimmers might find it refreshing.
🦭
Cold
Below +16°C
🏄♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Think of bringing a full-body or shorty wetsuit (3mm-5mm thickness) to provide insulation and maintain body heat.
Climate in San Sebastian in May
San Sebastian weather looks like this, on average, in May and the surrounding months.
April
May
June
Avg. temperature
+16°C
+19°C
+21°C
Min. temperature
+1°C
+4°C
+9°C
Max. temperature
+31°C
+36°C
+41°C
Rainfall
140 mm
130 mm
102 mm
Wind
2 m/s
2 m/s
2 m/s
Avg. water temperature
+14°C
+16°C
+19°C
Humidity
76%
78%
80%
Air pressure
1015 HPa
1016 HPa
1017 HPa
Sunny days
4
4
4
Cloudy days
6
6
8
Rainy days
19
20
17
Snowy days
0
0
0
May weather is still as ok as in April.It’s getting warmer as May arrives. The average maximum temperature goes up from +16°C to +19°C during the day.As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 140 mm to 130 mm.Humidity rises from 76% to 78%.The average wind speed doesn’t change much during May, staying around 2 m/s.The amount of sunny days stay about the same, averaging 4 sunny days during the month.
Wind speed in San Sebastian in May based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in San Sebastian is gradually increasing during May, going from 1 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during May in San Sebastian based on historical data.
Last Year
Historical Data
Total precipitation in May is about 174 mm, with a 68% chance of rain on a typical day. The maximum amount of rainfall per day is around 45 mm, which is moderate rain.May is a pretty wet month with over 21 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how May is compared with other months in the amount of precipitation, total mm:
San Sebastian wettest month is November, where a typical day has a 60% chance of precipitation and 191 mm of rainfall per day. July, on the other hand, is the driest month with a mere 52% chance of precipitation and 93 mm of rainfall per day.
How was the weather last May in San Sebastian?
This is the weather in San Sebastian in May 2024:
1 May
☁️
+17°C
2 May
☀️
+20°C
3 May
☀️
+28°C
4 May
☀️
+21°C
5 May
☀️
+22°C
6 May
☀️
+20°C
7 May
🌧️
+19°C
8 May
☀️
+20°C
9 May
🌧️
+18°C
10 May
🌧️
+16°C
11 May
🌧️
+15°C
12 May
🌧️
+15°C
13 May
🌧️
+16°C
14 May
🌧️
+16°C
15 May
🌧️
+16°C
16 May
🌧️
+17°C
17 May
☀️
+17°C
18 May
☁️
+18°C
19 May
🌧️
+18°C
20 May
🌧️
+18°C
21 May
☁️
+18°C
22 May
☁️
+17°C
23 May
🌧️
+18°C
24 May
🌧️
+18°C
25 May
☁️
+18°C
26 May
☀️
+21°C
27 May
☀️
+27°C
28 May
☀️
+23°C
29 May
☀️
+22°C
30 May
☀️
+22°C
31 May
☁️
+20°C
In May 2024 San Sebastian had 12 sunny days, 6 cloudy days, and 13 rainy days. The average maximum temperature was +19°C, with an absolute maximum of +28°C and a minimum of +15°C. The average humidity was 83%, with a maximum of 100% and a minimum of 39%. The average wind speed was 2 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in May?
Climate Change over Years
This is how San Sebastian climate have been changing during last 43 years period.
The climate in San Sebastian in May has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+16°C) and the highest in 2022 (+20°C). The driest year was 1989 with only 973 mm of rainfall, and the wettest year was 2019 with 4351 mm.
FAQ
Frequently asked questions about the weather in San Sebastian in May:
Is May a good time to visit San Sebastian?
It’s always a good time to visit San Sebastian, but the weather is changeable in May, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in San Sebastian in May?
May has mild temperatures in San Sebastian. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in San Sebastian in May?
In general, you can swim in San Sebastian in May, if you want to, at an average water temperature of +16°C. But it will feel quite cool, and some precautions are necessary to ensure your comfort and safety.
Is San Sebastian rainy in May?
San Sebastian is often rainy in May. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in San Sebastian in May?
Usually, it’s not very sunny in San Sebastian in May, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in San Sebastian, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
