May weather forecast
Gampaha, Sri Lanka

May marks the advent of the monsoon season in full force in Gampaha, Sri Lanka. Rainfall hits a high of 204mm (8.03"), falling over 26.3 days in this month. The increase in rainfall accompanied by a slight drop in temperature signifies this transition. While hours of sunshine start declining, daylight hours maintain stability. May is a month where the city is soaked, amplifying the green scenery and making it a splendid sight for nature enthusiasts.

Temperature

With the onset of May, the average high-temperature registers at a still hot 30.8°C (87.4°F), subtly different from April's 32°C (89.6°F). May nights reflect a consistent temperature dip to a moderately hot 26.4°C (79.5°F), a slight descent from daytime peaks.

Heat index

In May, the heat index is appraised at a blisteringly hot 40°C (104°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
In terms of the heat index, values are set with light wind and shade conditions in mind. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

In May, the average relative humidity in Gampaha is 80%.

Rainfall

In Gampaha, Sri Lanka, in May, it is raining for 26.3 days, with typically 204mm (8.03") of accumulated precipitation. In Gampaha, during the entire year, the rain falls for 265.4 days and collects up to 1744mm (68.66") of precipitation.

Daylight

In May, the average length of the day is 12h and 27min.
On the first day of May, sunrise is at 05:55 and sunset at 18:18. On the last day of the month, sunrise is at 05:52 and sunset at 18:22 +0530.

Sunshine

The average sunshine in May is 8.8h.

UV index

May, June, August and October, with an average maximum UV index of 6, are months with the lowest UV index in Gampaha. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 6 in May interprets into the following advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Enhance your sun protection with tightly woven, yet airy clothing.