May weather forecastPorthill, ID

May

Weather in May

May, the last month of the spring in Porthill, is a refreshing month, with an average temperature varying between 59.7°F (15.4°C) and 36.7°F (2.6°C).

Temperature

As Porthill, Idaho, enters May, the average high-temperature increases from the a frosty 46°F (7.8°C) of April to a refreshing 59.7°F (15.4°C). Porthill measures a considerable dip from daytime highs with an average low-temperature of 36.7°F (2.6°C) during May.

Humidity

The average relative humidity in May is 69%.

Rainfall

In May, in Porthill, the rain falls for 16.3 days. Throughout May, 1.89" (48mm) of precipitation is accumulated. In Porthill, during the entire year, the rain falls for 157.1 days and collects up to 21.61" (549mm) of precipitation.

Snowfall

In Porthill, snow does not fall in May through August.

Daylight

In Porthill, the average length of the day in May is 15h and 19min.
On the first day of May, sunrise is at 6:23 am and sunset at 9:02 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 9:41 pm MDT.

Sunshine

In May, the average sunshine is 10.1h.

UV index

The average daily maximum UV index in May is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 3 in May translates into these instructions:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.

Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

May temperatures in Porthill vary between a high-temperature of 59.7°F (15.4°C) and a low-temperature of 36.7°F (2.6°C).

The average relative humidity in May in Porthill is 69%.

In Porthill, Idaho, during May, the rain falls for 16.3 days and regularly aggregates up to 1.89" (48mm) of precipitation.

May through August are months without snowfall.

In May, in Porthill, Idaho, it doesn't snow. April is the latest month when it typically snows.

In Porthill, the average day length in May is 15h and 19min.

On the first day of May, sunrise is at 6:23 am and sunset at 9:02 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 9:41 pm MDT.

The average sunshine duration in May in Porthill, Idaho, is 10.1h.

In May, the average daily maximum UV index in Porthill is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

46°F

59.7°F

65.3°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

4.7mph

4.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

8.1

12.6

13.9

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Porthill, ID

Average high temperature in May: 59.7°F

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (27.3°F).

Average low temperature in May: 36.7°F

The month with the highest average low temperature is August (47.7°F).
The coldest months (with the lowest average low temperature) are January and December (16.3°F).

Average pressure in May
Porthill, ID

Average pressure in May: 29.95"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in May
Porthill, ID

Average wind speed in May: 4.2mph

The windiest month (with the highest average wind speed) is June (4.3mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).

Average humidity in May
Porthill, ID

Average humidity in May: 69%

The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (55%).

Average rainfall in May
Porthill, ID

Average rainfall in May: 1.89"

The wettest month (with the highest rainfall) is December (2.76").
The driest month (with the least rainfall) is August (0.43").

Average rainfall days in May
Porthill, ID

Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is April (19.7 days).
The month with the least rainy days is August (6.5 days).

Average snowfall in May
Porthill, ID

Average snowfall in May: 0"

The month with the highest snowfall is January (11.02").
The months with the least snowfall are May, June, July and August (0").

Average snowfall days in May
Porthill, ID

Average snowfall days in May: 0 days

The month with the highest number of snowfall days is December (17.4 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Porthill, ID

Average daylight in May: 15h and 18min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

Average sunshine in May: 10h and 6min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in May
Porthill, ID

Average sunshine days in May: 12.6 days

The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is March (7.7 days).

Average UV index in May
Porthill, ID

Average UV index in May: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).