Climate and monthly weather forecastUmatilla, OR
Climate and monthly weather forecast
Weather in January
January, like December, in Umatilla, Oregon, is a wintry winter month, with an average temperature ranging between min 29.7°F (-1.3°C) and max 39.9°F (4.4°C). Upon the beginning of January, Umatilla's high-temperatures register at a still icy 39.9°F (4.4°C), closely mirroring the preceding month. Weather in January »Weather in February
The last month of the winter, February, is a frosty month in Umatilla, Oregon, with temperature in the range of an average high of 45.1°F (7.3°C) and an average low of 32.9°F (0.5°C). The shift to February signals an average high-temperature of a chilly 45.1°F (7.3°C), subtly varied from January's 39.9°F (4.4°C). Weather in February »Weather in March
The first month of the spring, March, is a cool month in Umatilla, Oregon, with temperature in the range of an average high of 54.1°F (12.3°C) and an average low of 37.9°F (3.3°C). With the onset of March, Umatilla's average high-temperature sees a rise, moving from February's frosty 45.1°F (7.3°C) to a fresh 54.1°F (12.3°C). Weather in March »Weather in April
April is an enjoyable spring month in Umatilla, Oregon, with an average temperature varying between 62.4°F (16.9°C) and 43.3°F (6.3°C). With the onset of April, Umatilla's weather sees a minor temperature rise, transitioning from a fresh 54.1°F (12.3°C) in March to an enjoyable 62.4°F (16.9°C). Weather in April »Weather in May
May, the last month of the spring in Umatilla, is a pleasant month, with temperature in the range of an average high of 72.1°F (22.3°C) and an average low of 49.8°F (9.9°C). Umatilla's transition into May is marked by a temperature shift, moving from a refreshing 62.4°F (16.9°C) in April to a pleasant 72.1°F (22.3°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Umatilla, Oregon, with temperature in the range of an average high of 79.2°F (26.2°C) and an average low of 55.9°F (13.3°C). The commencement of June sees a minor shift in the average high-temperature, moving from an agreeable 72.1°F (22.3°C) in May to a warm 79.2°F (26.2°C). Weather in June »Weather in July
July is a tropical summer month in Umatilla, Oregon, with an average temperature varying between 62.8°F (17.1°C) and 89.1°F (31.7°C). In Umatilla, July is identified by the highest average temperatures, reaching a peak of 89.1°F (31.7°C) and a low of 62.8°F (17.1°C). Weather in July »Weather in August
August, the last month of the summer in Umatilla, is another tropical month, with an average temperature ranging between max 87.8°F (31°C) and min 64.2°F (17.9°C). Umatilla experiences an average high-temperature of a still hot 87.8°F (31°C) with the onset of August, subtly varied from July's 89.1°F (31.7°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Umatilla, Oregon, with an average temperature fluctuating between 77.2°F (25.1°C) and 57.4°F (14.1°C). During the transition into September, Umatilla observes a decrease in the average high-temperature, falling from a hot 87.8°F (31°C) in August to a warm 77.2°F (25.1°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Umatilla, Oregon, with an average temperature ranging between min 46.8°F (8.2°C) and max 61.9°F (16.6°C). Umatilla in October showcases a distinct temperature shift, moving from an average high of a warm 77.2°F (25.1°C) in September to a comfortable 61.9°F (16.6°C). Weather in October »Weather in November
November, the last month of the autumn in Umatilla, is another chilly month, with an average temperature varying between 36.7°F (2.6°C) and 49.1°F (9.5°C). Umatilla's weather changes with the onset of November, slightly falling from an enjoyable 61.9°F (16.6°C) in October to a chilly 49.1°F (9.5°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Umatilla, Oregon, with temperature in the range of an average high of 38.7°F (3.7°C) and an average low of 28.6°F (-1.9°C). The coldest month is December, with an average high-temperature of 38.7°F (3.7°C) and an average low-temperature of 28.6°F (-1.9°C). Weather in December »Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average relative humidity of 79%, January is the most humid month.
In Umatilla, during the entire year, the rain falls for 106.1 days and collects up to 7.76" (197mm) of precipitation.
January through March, September, November and December are months with snowfall.
In Umatilla, during the entire year, snow falls for 10.3 days and aggregates up to 6.02" (153mm) of snow.
January and December, with an average of 5.4h of sunshine, are months with the least sunshine.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
The month with the most snowfall is February, when snow falls for 2.9 days and typically aggregates up to 2.83" (72mm) of snow.
March is the month with the most rainfall. Rain falls for 13.1 days and accumulates 1.02" (26mm) of precipitation.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
April through August and October are months without snowfall.
With an average of 15h and 42min of daylight, June has the longest days of the year.
July, characterized by an average high temperature of 89.1°F (31.7°C) and a low temperature of 62.8°F (17.1°C), is generally the warmest month.
The months with the lowest humidity are July and August, with an average relative humidity of 36%.
The month with the least rainfall is July, when the rain falls for 3.8 days and typically collects 0.16" (4mm) of precipitation.
The months with the most sunshine are July and August, with an average of 12h of sunshine.
The month with the highest UV index is July, with an average maximum UV index of 7.
In Umatilla, December is the month with the lowest recorded average temperatures, measuring a high of 38.7°F (3.7°C) and a low of 28.6°F (-1.9°C).
December has the shortest days of the year, with an average of 8h and 42min of daylight.
Average temperature
Umatilla, OR
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (38.7°F).
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure
Umatilla, OR
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Umatilla, OR
- Average wind speed in January:
6.6mph - Average wind speed in February:
7.4mph - Average wind speed in March:
8.5mph - Average wind speed in April:
9.3mph - Average wind speed in May:
8.2mph - Average wind speed in June:
8.7mph
- Average wind speed in July:
7.7mph - Average wind speed in August:
7.2mph - Average wind speed in September:
7.2mph - Average wind speed in October:
7mph - Average wind speed in November:
7.2mph - Average wind speed in December:
6.2mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is December (6.2mph).
Average humidity
Umatilla, OR
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall
Umatilla, OR
- Average rainfall in January:
0.98" - Average rainfall in February:
0.94" - Average rainfall in March:
1.02" - Average rainfall in April:
0.55" - Average rainfall in May:
0.75" - Average rainfall in June:
0.47"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.28" - Average rainfall in September:
0.31" - Average rainfall in October:
0.71" - Average rainfall in November:
0.59" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is March (1.02").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Umatilla, OR
- Average rainfall days in January:
11.3 days - Average rainfall days in February:
9.5 days - Average rainfall days in March:
13.1 days - Average rainfall days in April:
10.5 days - Average rainfall days in May:
9.2 days - Average rainfall days in June:
7 days
- Average rainfall days in July:
3.8 days - Average rainfall days in August:
4.1 days - Average rainfall days in September:
5.6 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
10.7 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is March (13.1 days).
The month with the least rainy days is July (3.8 days).
Average snowfall
Umatilla, OR
The month with the highest snowfall is February (2.83").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days
Umatilla, OR
- Average snowfall days in January:
2.3 days - Average snowfall days in February:
2.9 days - Average snowfall days in March:
0.9 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.9 days - Average snowfall days in December:
3.2 days
The month with the highest number of snowfall days is December (3.2 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight / Average sunshine
Umatilla, OR
- Average daylight in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 42min
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 January:
5h and 24min - Average sunshine in February:
5h and 36min - Average sunshine in March:
7h and 36min - Average sunshine in April:
10h and 6min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 24min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 48min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 24min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days
Umatilla, OR
- Average sunshine days in January:
15.7 days - Average sunshine days in February:
14 days - Average sunshine days in March:
14.7 days - Average sunshine days in April:
16.4 days - Average sunshine days in May:
19.4 days - Average sunshine days in June:
21.4 days
- Average sunshine days in July:
25.3 days - Average sunshine days in August:
24.5 days - Average sunshine days in September:
22.6 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
16.6 days - Average sunshine days in December:
15.8 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is February (14 days).
Average UV index
Umatilla, OR
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Umatilla, OR
The months with the most cloud cover are January and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility
Umatilla, OR
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
