Weather in Oulu in May 2025
Average weather
Average temperature in Oulu in May
The expected average maximum temperature in May is +12°C with a maximum of +22°C and a minimum of -4°C.
The average maximum temperature goes up 35% by the end of the month, compared with the beginning of the month, from +3°C to +12°C.
Is Oulu warm or cold in May?
Oulu is typically cool in May.
Maximum temperatures go up compared to the previous month from +4°C to +11°C. The minimum temperature also goes up from -3°C to +3°C.
Pack a sweater and a jacket as there will be cooler temperatures.
Take a look at how May is compared to other months in Oulu:
Water temperature in Oulu in May
Water in Oulu in May is Cold. It varies from -1°C to +8°C, with an average of +3°C. The air temperature averaging +11°C is higher than the water temperature.
In May, water temperatures are average relative to the rest of the year:
Can you swim in Oulu in May?
Climate in Oulu in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +4°C | +11°C | +16°C | ||||
| Min. temperature | ||||||
| -18°C | -7°C | 0°C | ||||
| Max. temperature | ||||||
| +18°C | +30°C | +31°C | ||||
| Rainfall | ||||||
| 14 mm | 45 mm | 56 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| 0°C | +3°C | +11°C | ||||
| Humidity | ||||||
| 76% | 71% | 70% | ||||
| Air pressure | ||||||
| 1012 HPa | 1013 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 7 | 8 | 7 | ||||
| Cloudy days | ||||||
| 12 | 9 | 9 | ||||
| Rainy days | ||||||
| 4 | 12 | 14 | ||||
| Snowy days | ||||||
| 8 | 2 | 0 | ||||
May often has better weather than April. It’s getting warmer as May arrives. The average maximum temperature goes up from +4°C to +11°C during the day. Prepare for more rain. Average rainfall goes from 14 mm to 45 mm. It feels drier, as humidity decreases from 76% to 71%. The average wind speed doesn’t change much during May, staying around 3 m/s. The good news is there are likely to be more sunny days in May, from 7 to 8.
Next month (June) brings a further decline in the weather.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Oulu is gradually increasing during May, going from 2 m/s to 6 m/s over the course of the month.
Rain
Snow
Here’s how May is compared with other months in the amount of snow, total mm:
How was the weather last May in Oulu?
Climate Change over Years
The climate in Oulu in May has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+3°C) and the highest in 2020 (+8°C). The driest year was 2002 with only 247 mm of rainfall, and the wettest year was 2021 with 603 mm.
FAQ
Is May a good time to visit Oulu?
Can you sunbathe in Oulu in May?
Can you swim in Oulu in May?
Is Oulu rainy in May?
Is it sunny in Oulu in May?
Other cities in Finland
Monthly weather in Oulu
Source of the data
For this page, we’ve looked at the typical weather in Oulu, 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.