Reykjavik Weather in May
Iceland · Subarctic climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Reykjavik sees average temperatures ranging from a low of 3.8°C (38.8°F) to a high of 8.5°C (47.3°F), with a mean of 6.2°C (43.2°F). Compared to the annual average of 4.5°C (40.1°F), this month is 1.7°C warmer than the yearly norm. Precipitation averages 136.0mm, making it approximately 6.0mm wetter than the monthly average of 130.0mm. The city receives an average of 8.8 hours of sunshine per day during May, with relative humidity averaging 77.9%. Wind speeds reach an average maximum of 21.1 km/h. Snowfall averages 2.5cm during May, which can affect travel plans and outdoor activities. For travelers, this month offers a temperature experience in Reykjavik, with wetter-than-average conditions compared to the rest of the year.
Planning around Reykjavik's daylight is more important than temperature. I was there in June and the midnight sun meant I could hike at 11pm — disorienting but incredible. December gives you about 4 hours of daylight, which limits outdoor plans severely. The data shows mild temperatures for the latitude (rarely below -5°C thanks to the Gulf Stream), but wind chill is the real factor. Pack windproof everything, regardless of season.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 3.6°C (38.5°F) | 6.2°C (43.2°F) | 8.9°C (48.0°F) |
| Rainfall | 129.7mm | 136.0mm | 110.2mm |
| Sunshine | 6.9 hrs | 8.8 hrs | 8.2 hrs |
| Humidity | 78.6% | 77.9% | 81.0% |
| Wind | 21.2 km/h | 21.1 km/h | 20.1 km/h |
| Rainy Days | 17.6 | 22.8 | 23.0 |
| Snowfall | 15.0 cm | 2.5 cm | 0.1 cm |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Reykjavik in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Reykjavik in May?
The average temperature in Reykjavik during May ranges from 3.8°C (38.8°F) to 8.5°C (47.3°F), with a mean of 6.2°C (43.2°F).
How much does it rain in Reykjavik in May?
Reykjavik receives an average of 136.0mm of precipitation in May, spread across approximately 22.8 rainy days.
What should I pack for Reykjavik in May?
Based on May weather data, pack warm layers, a medium jacket, and waterproof outerwear. Rain gear is essential — this month averages 136.0mm of precipitation.
Is May a good time to visit Reykjavik?
May is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Reykjavik
Cities with Similar May Climate (Subarctic)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 64.15°, -21.94°. Timezone: Atlantic/Reykjavik. Last updated: 2026-07-30.