May weather forecastAlftanes, Iceland
May
Weather in May
May introduces the early signs of summer in Alftanes, Iceland. The temperature averages from 4.1°C (39.4°F) to 8.3°C (46.9°F), which, contrary to the previous cool weather, suggests a warmer climate. The absence of snowfall contributes to the thawing of the ground, encouraging the bloom of summer vegetation. Longer daylight hours and a decrease in rainfall reveal clear skies for the sun to lavishly spread its rays across the city.Temperature
With the onset of May in Alftanes, the average high-temperature subtly transitions from a wintry 4.9°C (40.8°F) in April to a chilly 8.3°C (46.9°F). Alftanes's nighttime average temperature in May subtly descends to an icy 4.1°C (39.4°F) from the daily highs.Humidity
With an average relative humidity of 75%, May is the least humid month in Alftanes.Rainfall
In Alftanes, Iceland, in May, it is raining for 15.5 days, with typically 32mm (1.26") of accumulated precipitation. In Alftanes, Iceland, during the entire year, the rain falls for 166.2 days and collects up to 416mm (16.38") of precipitation.Snowfall
Months with snowfall in Alftanes, Iceland, are January through May, October through December. May is the last month it regularly snows in Alftanes. During 1.2 snowfall days, in May, Alftanes aggregates 2mm (0.08") of snow. In Alftanes, during the entire year, snow falls for 41.1 days and aggregates up to 309mm (12.17") of snow.Sea temperature
In Alftanes, Iceland, the average seawater temperature in May is 6.9°C (44.4°F).Note: Diving into 6.9°C (44.4°F) when it's under 10°C (50°F) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
The average length of the day in May is 18h and 29min.On the first day of the month, sunrise is at 04:57 and sunset at 21:52. On the last day of May, in Alftanes, sunrise is at 03:24 and sunset at 23:27 GMT.
Sunshine
In May, the average sunshine in Alftanes is 7h.UV index
In Alftanes, the average daily maximum UV index in May is 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, the maximum UV index of 2 suggests these recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Alftanes, Iceland
- Average high temperature in May: 8.3°C
The warmest month (with the highest average high temperature) is July (13.5°C).
The month with the lowest average high temperature is December (1.3°C).
- Average low temperature in May: 4.1°C
The month with the highest average low temperature is July (9.1°C).
The coldest month (with the lowest average low temperature) is December (-2.4°C).
Average pressure in May
Alftanes, 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 (996.6mbar).
Average wind speed in May
Alftanes, Iceland
- Average wind speed in May: 19.1km/h
The windiest month (with the highest average wind speed) is February (24.9km/h).
The calmest months (with the lowest average wind speed) are June and July (14.9km/h).
Average humidity in May
Alftanes, Iceland
- Average humidity in May: 75%
The months with the highest relative humidity are January, February and September (82%).
The month with the lowest relative humidity is May (75%).
Average rainfall in May
Alftanes, Iceland
- Average rainfall in May: 32mm
The wettest month (with the highest rainfall) is January (47mm).
The driest months (with the least rainfall) are June and July (25mm).
Average rainfall days in May
Alftanes, Iceland
- Average rainfall days in May: 15.5 days
The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is December (9.7 days).
Average snowfall in May
Alftanes, Iceland
- Average snowfall in May: 2mm
The month with the highest snowfall is March (100mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in May
Alftanes, Iceland
- Average snowfall days in May: 1.2 days
The month with the highest number of snowfall days is March (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in May
Alftanes, Iceland
- Average sea temperature in May: 6.9°C
The best months for swimming (with the highest average sea temperature) are July and August (11.3°C).
The coldest month (with the lowest average sea temperature) is March (4.3°C).
Average daylight in May /
Average sunshine in May
Alftanes, Iceland
- Average daylight in May: 18h and 30min
The month with the longest days is June (Average daylight: 20h and 48min).
The month with the shortest days is December (Average daylight: 4h and 24min).
- Average sunshine in May: 7h and 0min
The month with the most sunshine is August (Average sunshine: 7h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in May
Alftanes, Iceland
- Average sunshine days in May: 10.4 days
The month with the most sunshine days is December (14.1 days).
The month with the least sunshine days is September (8.8 days).
Average UV index in May
Alftanes, Iceland
- Average UV index in May: 2
The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in May
Alftanes, Iceland
- Average cloud cover in May: 62
The months with the most cloud cover are March and April (Cloud cover 68).
The months with the least cloud cover are August and December (Cloud cover 60).
Average visibility in May
Alftanes, Iceland
- Average visibility in May: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).
