May weather forecastSelfoss, Iceland
May
Weather in May
May is the onset of relatively warmer temperatures in Selfoss. This is the time when the last traces of snow completely vanish, making it the first month of the year without any snowfall. The town starts to take on a more vibrant atmosphere with the lush greenery emerging after the snow melt. May also brings an increase in the amount of sunshine, providing warmer and longer days that are perfect for sightseeing and outdoor activities. Although rainfall is minimal, showers can nonetheless occur unexpectedly.Temperature
May introduces a marginal temperature uplift, with average high-temperatures adjusting from April's icy 5.5°C (41.9°F) to a chilly 8.5°C (47.3°F). Selfoss, during May nights, experiences a subtle shift to a low average of 4.3°C (39.7°F) from the day's heat.Humidity
The least humid month is May, with an average relative humidity of 74%.Rainfall
In Selfoss, in May, during 17.4 rainfall days, 63mm (2.48") of precipitation is typically accumulated. In Selfoss, Iceland, during the entire year, the rain falls for 208.7 days and collects up to 1105mm (43.5") of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Selfoss. During 1.3 snowfall days, in May, Selfoss aggregates 10mm (0.39") of snow. In Selfoss, Iceland, during the entire year, snow falls for 61.9 days and aggregates up to 825mm (32.48") of snow.Daylight
In Selfoss, the average length of the day in May is 18h and 25min.On the first day of the month, sunrise is at 04:54 and sunset at 21:47. On the last day of May, sunrise is at 03:22 and sunset at 23:20 GMT.
Sunshine
In Selfoss, the average sunshine in May is 7.6h.UV index
In Selfoss, the average daily maximum UV index in May is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: The average daily UV index of 3 in May transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Always opt for UVA and UVB-resistant sunglasses on radiant days. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Selfoss, Iceland
- Average high temperature in May: 8.5°C
The warmest month (with the highest average high temperature) is July (13.8°C).
The month with the lowest average high temperature is December (1.5°C).
- Average low temperature in May: 4.3°C
The month with the highest average low temperature is July (8.9°C).
The coldest month (with the lowest average low temperature) is December (-1.9°C).
Average pressure in May
Selfoss, Iceland
- Average pressure in May: 1012.1mbar
The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.8mbar).
Average wind speed in May
Selfoss, Iceland
- Average wind speed in May: 19.5km/h
The windiest month (with the highest average wind speed) is February (24.8km/h).
The calmest month (with the lowest average wind speed) is July (14.7km/h).
Average humidity in May
Selfoss, Iceland
- Average humidity in May: 74%
The months with the highest relative humidity are January and September (82%).
The month with the lowest relative humidity is May (74%).
Average rainfall in May
Selfoss, Iceland
- Average rainfall in May: 63mm
The wettest month (with the highest rainfall) is January (142mm).
The driest month (with the least rainfall) is June (45mm).
Average rainfall days in May
Selfoss, Iceland
- Average rainfall days in May: 17.4 days
The month with the highest number of rainy days is April (19.9 days).
The month with the least rainy days is December (14.3 days).
Average snowfall in May
Selfoss, Iceland
- Average snowfall in May: 10mm
The month with the highest snowfall is March (220mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in May
Selfoss, Iceland
- Average snowfall days in May: 1.3 days
The month with the highest number of snowfall days is March (13.3 days).
The months with the least snowfall days are July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Selfoss, Iceland
- Average daylight in May: 18h and 24min
The month with the longest days is June (Average daylight: 20h and 42min).
The month with the shortest days is December (Average daylight: 4h and 30min).
- Average sunshine in May: 7h and 36min
The month with the most sunshine is August (Average sunshine: 7h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in May
Selfoss, Iceland
- Average sunshine days in May: 11 days
The month with the most sunshine days is June (12.3 days).
The month with the least sunshine days is January (5.5 days).
Average UV index in May
Selfoss, Iceland
- Average UV index in May: 3
The month with the highest UV index is July (UV index 4).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in May
Selfoss, Iceland
- Average cloud cover in May: 59
The month with the most cloud cover is March (Cloud cover 67).
The months with the least cloud cover are May and August (Cloud cover 59).
Average visibility in May
Selfoss, Iceland
- Average visibility in May: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February and March (8km).
