Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average sea temperature in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
May
Weather in May
Temperature
The transition from April to May sees average high-temperatures adjusting to a still pleasant 21.5°C (70.7°F), from a not significantly different 22.3°C (72.1°F). In May, Port Saint Johns experiences an average nighttime temperature of 9.8°C (49.6°F).Humidity
The average relative humidity in May in Port Saint Johns is 65%.Rainfall
In May, the rain falls for 7.4 days. Throughout May, 13mm (0.51") of precipitation is accumulated. In Port Saint Johns, during the entire year, the rain falls for 172 days and collects up to 557mm (21.93") of precipitation.Sea temperature
In Port Saint Johns, in May, the average water temperature is 24.2°C (75.6°F).Note: When thinking about a swim in 24.2°C (75.6°F) waters, consider your cold tolerance, the day's sunshine, wind, and air temperature. It is a fun fact that Olympic swimmers dive into waters of 25°C (77°F) to 28°C (82.4°F).
Daylight
In May, the average length of the day in Port Saint Johns is 10h and 31min.On the first day of May, sunrise is at 06:33 and sunset at 17:24. On the last day of the month, sunrise is at 06:52 and sunset at 17:06 SAST.
Sunshine
In May, the average sunshine is 6.9h.UV index
The months with the lowest UV index are May through July, September and October, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: In May, the maximum UV index of 4 suggests this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Warning! Sand and water reflections boost the intensity of UV exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Port Saint Johns in May?
What is the average humidity in May in Port Saint Johns?
How much does it rain in Port Saint Johns in May?
What is the water temperature in May in Port Saint Johns?
What is the average length of the day in May in Port Saint Johns?
What time are sunrise and sunset in May in Port Saint Johns?
How many hours of sunshine does Port Saint Johns have in May?
When is the lowest UV index in Port Saint Johns?
What is the UV index reading in May in Port Saint Johns?
Average temperature in May
Port Saint Johns, South Africa
- Average high temperature in May: 21.5°C
The warmest months (with the highest average high temperature) are January and February (25.8°C).
The month with the lowest average high temperature is July (19.1°C).
- Average low temperature in May: 9.8°C
The month with the highest average low temperature is February (15.3°C).
The coldest month (with the lowest average low temperature) is July (7.2°C).
Average pressure in May
Port Saint Johns, South Africa
- Average pressure in May: 1020mbar
The month with the highest atmospheric pressure is July (1023.5mbar).
The month with the lowest atmospheric pressure is January (1014.1mbar).
Average wind speed in May
Port Saint Johns, South Africa
- Average wind speed in May: 7.1km/h
The windiest month (with the highest average wind speed) is August (8.4km/h).
The calmest month (with the lowest average wind speed) is March (6.5km/h).
Average humidity in May
Port Saint Johns, South Africa
- Average humidity in May: 65%
The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July and August (55%).
Average rainfall in May
Port Saint Johns, South Africa
- Average rainfall in May: 13mm
The wettest month (with the highest rainfall) is January (93mm).
The driest month (with the least rainfall) is June (11mm).
Average rainfall days in May
Port Saint Johns, South Africa
- Average rainfall days in May: 7.4 days
The month with the highest number of rainy days is December (23.5 days).
The month with the least rainy days is June (5 days).
Average sea temperature in May
Port Saint Johns, South Africa
- Average sea temperature in May: 24.2°C
The best month for swimming (with the highest average sea temperature) is March (26.4°C).
The coldest month (with the lowest average sea temperature) is August (21°C).
Average daylight in May /
Average sunshine in May
Port Saint Johns, South Africa
- Average daylight in May: 10h and 3min
The month with the longest days is December (Average daylight: 14h and 12min).
The month with the shortest days is June (Average daylight: 10h and 6min).
- Average sunshine in May: 6h and 5min
The month with the most sunshine is October (Average sunshine: 8h and 36min).
The month with the least sunshine is April (Average sunshine: 6h and 12min).
Average sunshine days in May
Port Saint Johns, South Africa
- Average sunshine days in May: 21.5 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is January (4.4 days).
Average UV index in May
Port Saint Johns, South Africa
- Average UV index in May: 4
The months with the highest UV index are January, February, March, April, August, November and December (UV index 5).
The months with the lowest UV index are May, June, July, September and October (UV index 4).
Average cloud cover in May
Port Saint Johns, South Africa
- Average cloud cover in May: 25
The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is June (Cloud cover 17).
Average visibility in May
Port Saint Johns, South Africa
- Average visibility in May: 9km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (6km).
