May weather forecast
Hillsboro, OR

The red tree colors of the fall along a road and amid trees in this tranquil neighborhood in Hillsboro, Oregon
The red tree colors of the fall along a road and amid trees in this tranquil neighborhood in Hillsboro, Oregon

Weather in May

May, the last month of the spring in Hillsboro, is an enjoyable month, with an average temperature fluctuating between 44.4°F (6.9°C) and 67.1°F (19.5°C).

Temperature

In Hillsboro, the average high-temperature in May slightly increases from a mild 58.3°F (14.6°C) in April to an enjoyable 67.1°F (19.5°C). In Hillsboro, in May, the average low-temperature is 44.4°F (6.9°C).

Humidity

In May, the average relative humidity is 73%.

Rainfall

In Hillsboro, during 13.6 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. In Hillsboro, during the entire year, the rain falls for 173 days and collects up to 29.49" (749mm) of precipitation.

Snowfall

April through October are months without snowfall in Hillsboro, Oregon.

Daylight

In Hillsboro, Oregon, the average length of the day in May is 14h and 56min.
On the first day of the month, sunrise is at 5:59 am and sunset at 8:18 pm. On the last day of May, sunrise is at 5:26 am and sunset at 8:52 pm PDT.

Sunshine

In Hillsboro, the average sunshine in May is 8.3h.

UV index

In Hillsboro, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in May in Hillsboro?

In May, the average high-temperature is 67.1°F (19.5°C), and the average low-temperature is 44.4°F (6.9°C).

What is the average humidity in May in Hillsboro?

The average relative humidity in May in Hillsboro, Oregon, is 73%.

How many days does it rain in May in Hillsboro?

In Hillsboro, Oregon, during May, the rain falls for 13.6 days and regularly aggregates up to 1.73" (44mm) of precipitation.

When it does not snow in Hillsboro?

In Hillsboro, snow does not fall in April through October.

What is the average length of the day in May in Hillsboro?

In May, the average day length is 14h and 56min.

When is the sunrise / sunset in May in Hillsboro?

In May, on the first day of the month, sunrise is at 5:59 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:26 am and sunset at 8:52 pm PDT.

How many hours of sunshine does Hillsboro have in May?

In May, the average sunshine duration in Hillsboro is 8.3h.

What is the UV index reading in May in Hillsboro?

In Hillsboro, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Hillsboro, OR

Average temperature in May - Hillsboro, OR
  • Average high temperature in May: 67.1°F

The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (43.9°F).

  • Average low temperature in May: 44.4°F

The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is December (34°F).

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Average pressure in May
Hillsboro, OR

Average pressure in May - Hillsboro, OR
  • Average pressure in May: 30.04"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).

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Average wind speed in May
Hillsboro, OR

Average wind speed in May - Hillsboro, OR
  • Average wind speed in May: 4.4mph

The windiest month (with the highest average wind speed) is March (5mph).
The calmest months (with the lowest average wind speed) are June, August and September (4.3mph).

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Average humidity in May
Hillsboro, OR

Average humidity in May - Hillsboro, OR
  • Average humidity in May: 73%

The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is August (64%).

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Average rainfall in May
Hillsboro, OR

Average rainfall in May - Hillsboro, OR
  • Average rainfall in May: 1.73"

The wettest month (with the highest rainfall) is January (4.57").
The driest month (with the least rainfall) is August (0.31").

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Average rainfall days in May
Hillsboro, OR

Average rainfall days in May - Hillsboro, OR
  • Average rainfall days in May: 13.6 days

The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (4.4 days).

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Average snowfall in May
Hillsboro, OR

Average snowfall in May - Hillsboro, OR
  • Average snowfall in May: 0"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in May
Hillsboro, OR

Average snowfall days in May - Hillsboro, OR
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in May /
Average sunshine in May
Hillsboro, OR

Average daylight in May / Average sunshine in May - Hillsboro, OR
  • Average daylight in May: 14h and 56min

The month with the longest days is June (Average daylight: 15h and 38min).
The month with the shortest days is December (Average daylight: 8h and 46min).

  • Average sunshine in May: 8h and 18min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).

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Average sunshine days in May
Hillsboro, OR

Average sunshine days in May - Hillsboro, OR
  • Average sunshine days in May: 16.2 days

The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (8.5 days).

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Average UV index in May
Hillsboro, OR

Average UV index in May - Hillsboro, OR
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Hillsboro, OR

Average cloud cover in May - Hillsboro, OR
  • Average cloud cover in May: 49

The month with the most cloud cover is February (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in May
Hillsboro, OR

Average visibility in May - Hillsboro, OR
  • Average visibility in May: 5mi

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January and February (4mi).

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