May weather forecast
Astoria, OR

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A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia river
A scenic seaside shot of the city of Astoria in Oregon, with a view of the iconic Astoria Megler bridge crossing over the Columbia river

Weather in May

May ushers in the beauty of spring in Astoria, creating a stark contrast to the city's more humid winter begetting a remarkable change in scenery. There's a significant rise in the average temperature, presenting sunnier and drier conditions than April. In May, temperatures spring into action with the high recording at 58.3°F (14.6°C) and lows at 45.7°F (7.6°C). While rain showers continue, they are more sporadic and much lighter than the prolonged seasonal rainfall the city experienced during winter and early spring. Anticipating June, the seasonal progression in Astoria transitions seamlessly from the enjoyable spring to the peak of summer.

Temperature

The arrival of May brings a soft temperature shift, with the average high-temperature nudging from a cool 52.3°F (11.3°C) in April to a mild 58.3°F (14.6°C). During the month of May, Astoria's nighttime temperature lowers to an average of 45.7°F (7.6°C).

Humidity

The least humid month in Astoria is May, with an average relative humidity of 81%.

Rainfall

In Astoria, during May, the rain falls for 13.4 days and regularly aggregates up to 1.97" (50mm) of precipitation. Throughout the year, in Astoria, Oregon, there are 192.7 rainfall days, and 40.12" (1019mm) of precipitation is accumulated.

Snowfall

In Astoria, snow does not fall in April through November.

Ocean temperature

In Astoria, in May, the average water temperature is 52.7°F (11.5°C).
Note: With an efficient thermal swimsuit, one can navigate 52.7°F (11.5°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.

Daylight

The average length of the day in May is 15h and 0min.
On the first day of the month, sunrise is at 6:00 am and sunset at 8:24 pm. On the last day of May, sunrise is at 5:27 am and sunset at 8:59 pm PDT.

Sunshine

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

UV index

In May, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high daily UV index of 3 during May translates into the following directions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
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Frequently asked questions

What is the usual temperature for Astoria in May?

The high-temperature, in May, in Astoria, is 58.3°F (14.6°C), while the low-temperature averages to 45.7°F (7.6°C).

What is the least humid month in Astoria?

The least humid month in Astoria is May, with an average relative humidity of 81%.

What is the average humidity in May in Astoria?

In Astoria, the average relative humidity in May is 81%.

How much does it rain in Astoria in May?

In May, in Astoria, the rain falls for 13.4 days. Throughout May, 1.97" (50mm) of precipitation is accumulated.

When it does not snow in Astoria?

In Astoria, snow does not fall in April through November.

How cold is the water in May in Astoria?

In May, the average ocean temperature in Astoria, Oregon, is 52.7°F (11.5°C). Swimming in 52.7°F (11.5°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Astoria have in May?

In May, the average day length in Astoria is 15h and 0min.

What time are sunrise and sunset in May in Astoria?

In May, on the first day of the month, sunrise is at 6:00 am and sunset at 8:24 pm. On the last day of the month, in Astoria, Oregon, sunrise is at 5:27 am and sunset at 8:59 pm PDT.

How many hours of sunshine does Astoria have in May?

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

What is the UV index reading in May in Astoria?

The average daily maximum UV index in May in Astoria, Oregon, is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
52.3°F 11.3°C
58.3°F 14.6°C
61.9°F 16.6°C
Average low temperature
42.1°F 5.6°C
45.7°F 7.6°C
48.9°F 9.4°C
Average pressure
30.07" 764mmHg
30.05" 763mmHg
30.06" 764mmHg
Average wind speed
7.5mph 12.1km/h
6.5mph 10.5km/h
6.2mph 10km/h
Average max. wind speed
8.2mph 13.2km/h
7.3mph 11.7km/h
7mph 11.3km/h
Average wind speed gusts
11.6mph 18.7km/h
9.9mph 15.9km/h
9.2mph 14.8km/h
Average humidity
82%
81%
82%
Average rainfall
3.15" 80mm
1.97" 50mm
1.46" 37mm
Average rainfall days
20
13.4
13
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
49.6°F 9.8°C
52.8°F 11.6°C
55.9°F 13.3°C
Average daylight
13h 4min
15h 0min
15h 4min
Average sunshine
7h 1min
8h 2min
8h 5min
Average sunshine days
8.2
15.1
14.3
Average UV index
3
3
4
Average cloud cover
54%
49%
48%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Astoria, OR

Average temperature in May - Astoria, OR
  • Average high temperature in May: 58.3°F

The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (45.1°F).

  • Average low temperature in May: 45.7°F

The month with the highest average low temperature is August (53.1°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).

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Average pressure in May
Astoria, OR

Average pressure in May - Astoria, OR
  • Average pressure in May: 30.05"Hg

The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March and September (30.02"Hg).

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Average wind speed in May
Astoria, OR

Average wind speed in May - Astoria, OR
  • Average wind speed in May: 6.5mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in May
Astoria, OR

Average humidity in May - Astoria, OR
  • Average humidity in May: 81%

The months with the highest relative humidity are January, February, March, November and December (84%).
The month with the lowest relative humidity is May (81%).

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Average rainfall in May
Astoria, OR

Average rainfall in May - Astoria, OR
  • Average rainfall in May: 1.97"

The wettest month (with the highest rainfall) is December (6.42").
The driest month (with the least rainfall) is July (0.51").

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Average rainfall days in May
Astoria, OR

Average rainfall days in May - Astoria, OR
  • Average rainfall days in May: 13.4 days

The month with the highest number of rainy days is December (21.2 days).
The month with the least rainy days is August (7.2 days).

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Average snowfall in May
Astoria, OR

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

The month with the highest snowfall is February (0.91").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in May
Astoria, OR

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

The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average sea temperature in May
Astoria, OR

Average sea temperature in May - Astoria, OR
  • Average sea temperature in May: 52.8°F

The best month for swimming (with the highest average sea temperature) is July (56.9°F).
The coldest month (with the lowest average sea temperature) is February (47.7°F).

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

Average daylight in May / Average sunshine in May - Astoria, OR
  • Average daylight in May: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in May: 8h and 2min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).

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Average sunshine days in May
Astoria, OR

Average sunshine days in May - Astoria, OR
  • Average sunshine days in May: 15.1 days

The month with the most sunshine days is August (20.1 days).
The month with the least sunshine days is February (7.5 days).

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Average UV index in May
Astoria, OR

Average UV index in May - Astoria, OR
  • 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 2).

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Average cloud cover in May
Astoria, OR

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

The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 36).

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Average visibility in May
Astoria, OR

Average visibility in May - Astoria, OR
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are July, August and September (5mi).

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Astoria, Oregon, USA

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