Climate and monthly weather forecastHermiston, OR

The climate of Hermiston

Hermiston, Oregon belongs to the Mid-latitude steppe, a designation of the Köppen climate classification system indicating a semi-arid climate. This geographical location offers mild and moderately dry atmospheric conditions throughout the year.

When examining the climate data presented for Hermiston, it is evident that temperature fluctuations occur distinctively across different seasons. High temperatures take a journey from a chilly 39.9°F (4.4°C) in January, slowly elevating to a peak at 88°F (31.1°C) in July, before descending back to 38.8°F (3.8°C) by December. Parallel to this, low temperatures also show a similar pattern starting at 29.7°F (-1.3°C) in January, climbing to 64°F (17.8°C) in August and dropping back to 28.6°F (-1.9°C) by year's end.

Relative humidity undergoes significant decrease from February to July and starts increasing again from August to January, with lowest of 36% in July and August, and highest of 79% in January. Rainfall does not show a drastic pattern change throughout the year, but lowest precipitation records from 0.16" (4mm) in July and higlight occurse from 0.98" (25mm) in January and February to 1.06" (27mm) in March and December. Days of snowfall are predominantly confined to the winter months with up to 1.3" (33mm) in December.

The best time to visit Hermiston

The apt time to visit Hermiston primarily depends on the preferred weather conditions of the visitors. However, with climatic statistics in hand, it stands to reason that the best time to visit Hermiston would be during the late spring to early summer, specifically from May to June. During this time, the average high temperatures range from a comfortable 71.2°F (21.8°C) to 78.1°F (25.6°C) while the low temperatures range between 49.6°F (9.8°C) and 55.8°F (13.2°C) respectively. This period also sees a decrease in humidity levels and relatively low rainfall, with precipitation levels of 0.67" (17mm) and 0.51" (13mm).

The worst time to visit Hermiston

Visitors are likely to find the cold and damp conditions from December to February potentially challenging. Temperatures during this period remain low with average highs from 39.9°F (4.4°C) to 45°F (7.2°C) and dipping lows from 28.6°F (-1.9°C) to 32.5°F (0.3°C). Additionally, humidity increases up to 77% to 79% and the rainfall peaks to 0.98" (25mm) to 1.06" (27mm), making the weather fairly inhospitable for outdoor activities.

Spring weather in Hermiston

Spring blossoms around March in Hermiston, bringing milder temperatures and declining humidity levels. The high temperatures shift from 53.2°F (11.8°C) in March to 71.2°F (21.8°C) in May, with corresponding low temperatures of 37.9°F (3.3°C) to 49.6°F (9.8°C). Rainfall happens moderately, fluctuating between 1.06" (27mm) in March to 0.67" (17mm) in May.

Summer weather in Hermiston

Hermiston experiences the peak of summer from June to August with high temperatures shooting up to between 78.1°F (25.6°C) in June and 88°F (31.1°C) in July. The low temperatures remain pleasant at an average from 55.8°F (13.2°C) to 64°F (17.8°C). The rainfall stays minimal during this period, making Hermiston’s summer a prime time for outdoor activities.

Autumn weather in Hermiston

The fresh and mild autumn starts in September, presenting gradually decreasing temperatures from 76.1°F (24.5°C) to 48.7°F (9.3°C) by November. Relatedly, the low temperatures also drop from 57°F (13.9°C) to 36.9°F (2.7°C). Autumn sees moderate rainfall levels with 0.31" (8mm) in September increasing to 0.67" (17mm) in November.

Winter weather in Hermiston

The chilly winters grip Hermiston from December, bringing along an upsurge in rainfall and humidity. The winter high temperatures range from 48.7°F (9.3°C) in November to 38.8°F (3.8°C) in December while the low temperatures drop from 36.9°F (2.7°C) to 28.6°F (-1.9°C). Snowfall, though not heavy, becomes a frequent winter characteristic with up to 1.3" (33mm) in December.

Weather in January

The start of the year in Hermiston, Oregon, witnesses a generally cold and wet weather pattern. Despite the chill, January presents an interesting mix of winter conditions with the high relative humidity of 79%. One unique aspect of January is the presence of snowfall, amounting to 1.06" (27mm) over an average of 2.5 days. Weather in January »

Weather in February

In February, the weather in Hermiston, Oregon, remains on the colder side, continuing its winter run from January. Though the temperature escalates a few degrees from the previous month, it still captures snowfall. The month records the highest snowfall amount of the year, hitting a peak of 2.72" (69mm) across an average of 3.4 days. Weather in February »

Weather in March

March brings the onset of the spring season in Hermiston, Oregon. Shaking off the biting cold of winter, the weather warms considerably with a decrease in snowfall quantities. Daylight hours extend, and sunshine permeates the skies more frequently, signaling the retreat of the winter chill. Weather in March »

Weather in April

April sees a pronounced shift in the Hermiston, Oregon, weather as the spring season fully unfolds. As the weather turns warmer, the last vestiges of winter snowfall disappear entirely. The month revels in an increasing amount of sunshine and extended daylight hours, making it an inviting time for outdoor activities. Weather in April »

Weather in May

The beaming rays of May in Hermiston, Oregon, lay embeddings of the impending summer. As temperatures climb steadily, both the humidity and cloud percentage have a marked decrease. These transitions compose a setting well-suited for daytime outdoor activities, with ample sunshine and bright, clear skies. Weather in May »

Weather in June

June in Hermiston, Oregon, marks the onset of summer with temperatures continuing their upward trend from the previous month. The city witnesses the beauty of clear blue skies as cloud percentage dwindles, reaching its lowest in the year. Weather in June »

Weather in July

July’s scorching sun firmly establishes summer in Hermiston, Oregon. Temperatures during this month peak for the year, touching a blazing 88°F (31.1°C) - a significant escalation from June. July marks the zenith of outdoor festivity, imbued with a characteristic summer vibe. Weather in July »

Weather in August

The summer season persists in Hermiston, Oregon, in August with slightly vibrant, less harsh weather conditions compared to July. There's a slight decrease in temperature from its annual peak in the previous month, but summer heat still dominates. Weather in August »

Weather in September

September marks the transition from a hot, blazing summer to the milder weather of autumn in Hermiston, Oregon. Gradual variations in the weather patterns commence with a notable reduction in daytime temperatures. There's a distinctive coolness that starts to lace the air, especially in the evenings. Weather in September »

Weather in October

October witnesses Hermiston, Oregon, in the full swing of autumn. The weather becomes considerably colder compared to September, as the city prepares for the winter season that lies ahead. This is a time of year when nature puts on a dramatic performance, with vivid fall colors reaching their apex. Weather in October »

Weather in November

November ushers in the chill of late-autumn in Hermiston, Oregon. With the temperatures spiraling down from October, signs of an approaching winter begin to manifest. Intermittent rainfall persists, augmenting the chilly late-autumn atmosphere. Weather in November »

Weather in December

In December, winter reigns supreme in Hermiston, Oregon. The city immerses in a cold spell, with average temperatures plummeting down to the lower end of the scale. Embodying the epitome of a northern winter's charm, light snowfall visiting the city adds to the magical holiday vibes. Weather in December »