Climate and monthly weather forecastGrants Pass, OR
Climate and monthly weather forecast
The climate of Grants Pass
Grants Pass, Oregon, USA, benefits from an overall Mediterranean, warm summer climate, classified under the Köppen Climate Classification as Csb. Located in southwestern Oregon, Grants Pass experiences moderate temperatures along with a combination of sun, rain, and occasional snow throughout the year.The weather in Grants Pass sees variations across all parameters in the course of the year. The highest average temperatures reach 84.7°F (29.3°C) in August, while the lowest plunge to 31.5°F (-0.3°C) in December. The climate remains relatively humid, with relative humidity percentages ranging from 63% in August to a peak of 85% in January.
Rainfall patterns show distinctive changes over the year. The city receives the majority of its rainfall in December with 4.02" (102mm), the number of rainfall days being 15.9. On the contrast, the driest month is July with a minimum rainfall of 0.12" (3mm) over just 3.4 days. A unique pattern in the climate of Grants Pass is the rare snowfall, with the most notable snowfall recorded in January and February, the snowfall in inches is 1.34 and 1.5 respectively.
The Best Time to Visit Grants Pass
The ideal time to visit Grants Pass is primarily between June and September, when the city experiences its warmest weather, with peak temperatures averaging from 66.7°F (19.3°C) to 84.7°F (29.3°C). This period also sees the highest average hours of sunshine, stretching from 10.7 hours in June to 11.8 hours in July and August. Moreover, relative humidity is at its lowest during these months around 64 to 67%, resulting in a pleasant, dry warmth.The Worst Time to Visit Grants Pass
The period from December to February is often considered the least favorable time to visit Grants Pass. During this period, the city experiences its coldest temperatures averaging from 31.5°F (-0.3°C) to 33.3°F (0.7°C). Moreover, the city confronts the highest rainfall in inches 4.02 in December and increased relative humidity percentages reaching up to 84 to 85%, making these months quite chilly and damp.Spring Weather in Grants Pass
Spring in Grants Pass typically falls between March and May, characterized by a gradual warming trend. Temperatures start at 52.5°F (11.4°C) in March and rise to 66.7°F (19.3°C) by May. Rainfall decreases from 3.19" (81mm) in March to 1.69" (43mm) in May. During this season, the city enjoys increased daylight hours, rising from 12 hours in March to 14.6 hours in May.Summer Weather in Grants Pass
The summer months in Grants Pass, from June to August, bring in the warmest temperatures, with averages reaching up to 84.7°F (29.3°C). The lowest recorded rainfall of the year is also observed during this period, from 0.71" (18mm) in June to a mere 0.12" (3mm) in July. The amount of sunshine extends up to 11.8 hours at its peak in July and August, making it the most luminous period of the year.Autumn Weather in Grants Pass
Autumn in Grants Pass starts in September and ends in November. Temperatures during this season fall from an average high of 77.4°F (25.2°C) in September to 54°F (12.2°C) in November. Rainfall figures rise significantly from a tender 0.59" (15mm) in September to 2.4" (61mm) in November. As the season progresses, daylight hours start to decrease, dropping from 12.5 hours in September to just 9.8 hours by November.Winter Weather in Grants Pass
Winter, stretching from December to February, is the coldest time in Grants Pass. Average temperatures range between 52.5°F (11.4°C) and 31.5°F (-0.3°C). The city receives the highest rainfall during this time, reaching 4.02" (102mm) in December. Nevetheless, despite the cooler climate, the average daylight hours remain significant, ranging from 9.5 to 10.6 hours. The winter period also records the most significant annual snowfall, peaking at 1.5" (38mm) in February.Weather in January
During January in Grants Pass, Oregon, USA, a distinct shift from the cold and wet winter weather of the previous month is absent. The city experiences a chilly atmosphere with high humidity. Despite a relatively high average of 15.3 rainfall days, the total accumulation is approximately 3.98" (101mm). Weather in January »Weather in February
The bite in the air lingers into February, with overcast conditions and limited sunlight contributing to a rather dreary atmosphere. While the weather remains predominantly chilly, there is a slight increase in average temperatures. Weather in February »Weather in March
Signs of Spring start to emerge in Grants Pass during March, much to the delight of the sun-deprived residents. Temperatures record a slight uptick, kick-starting the seasonal thaw. Weather patterns indicate a sustained reduction in rainfall to 3.19" (81mm) across 18.7 days, hinting at the end of the wet winter period. Weather in March »Weather in April
As April sets in, there is a discernible change in the weather conditions of Grants Pass. The Spring warmth brings relief from the lingering winter chill, markedly raising the average temperatures. Lower precipitation levels reflect a decrease in rainfall to 2.01" (51mm) spanning approximately 15.9 days. Weather in April »Weather in May
May sees the full glory of Spring, with rising temperatures and longer daylight hours enhancing outdoor activities. There is a significant drop in accumulated rainfall, with total precipitation clocking in at 1.69" (43mm) over just 11.8 days. Weather in May »Weather in June
June in Grants Pass welcomes the onset of Summer, revealing an upward trend in temperature and a decrease in precipitation. Rainfall sees a significant decrease with only 0.71" (18mm) spread over a mere 7.4 days. Extended daylight hours coupled with greater sunshine durations contribute to warmer days. Weather in June »Weather in July
July claims the title of the warmest month in Grants Pass, with average high temperatures soaring up to 83.8°F (28.8°C). It witnesses the least rainfall with a meager 0.12" (3mm) accumulated over just 3.4 days. The elongated daylight hours add to the summertime enjoyment. Weather in July »Weather in August
August persists with the prevailing summer warmth, albeit with a slight rise in temperatures. The trend of decreased rainfall continues into this month, with total precipitation rolling in at 0.2" (5mm) across 2.5 days. The city enjoys ample sunlight, long day hours, and an extended window of clear skies. Weather in August »Weather in September
September marks the transition to Fall in Grants Pass, bringing with it a decline in average temperatures. Rainfall inches upward with an accumulation of 0.59" (15mm) over 5.3 days, marking the onset of the rainy season after months of summer drought. Weather in September »Weather in October
October sees a further dip in temperature, paving the way for the upcoming winter. An obvious increase in rainfall records 1.54" (39mm) spread over 10.5 days. The city witnesses shorter days and lesser hours of sunshine, a prelude to the colder months. Weather in October »Weather in November
November ushers in the winter chill in Grants Pass, substantially lowering the average temperatures. This month witnesses an increased rainfall of 2.4" (61mm) across 13.4 days, characteristic of the season. The daylight hours continue to dwindle, setting the city up for the long winter nights ahead. Weather in November »Weather in December
December officially kickstarts the winter season in Grants Pass with a marked drop in temperatures. The city receives the highest rainfall of the year, accumulating up to 4.02" (102mm) over roughly 15.9 days. The limited daylight hours primarily contribute to the cold winter days. Weather in December »Updated: Jun 4, 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
January is the most humid month, with an average relative humidity of 85%.
Throughout the year, in Grants Pass, there are 135.3 rainfall days, and 23.54" (598mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
In Grants Pass, during the entire year, snow falls for 7.9 days and aggregates up to 5.12" (130mm) of snow.
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 2.8 days and typically aggregates up to 1.5" (38mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Grants Pass, 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.
In Grants Pass, snow does not fall in May through October.
The month with the longest days in Grants Pass, Oregon, is June, with an average of 15h and 12min of daylight.
The month with the least rainfall is July, when the rain falls for 3.4 days and typically collects 0.12" (3mm) of precipitation.
The months with the most sunshine are July and August, with an average of 11.8h of sunshine.
July is the month with the highest UV index, with an average maximum UV index of 6.
Grants Pass's warmest weather arrives in August, when temperatures average a high of 84.7°F (29.3°C) and a low of 49.1°F (9.5°C).
The least humid month is August, with an average relative humidity of 63%.
December, known for its average high temperature of 46°F (7.8°C) and an average low temperature of 31.5°F (-0.3°C), is the coldest month.
The month with the most rainfall is December, when the rain falls for 15.9 days and typically aggregates up to 4.02" (102mm) of precipitation.
With an average of 9h and 6min of daylight, December has the shortest days of the year.
With an average of 4.7h of sunshine, December has the least sunshine of the year.
Average temperature
Grants Pass, OR
The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (46°F).
The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).
Average pressure
Grants Pass, OR
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30.07"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed
Grants Pass, OR
- Average wind speed in January:
3.9mph - Average wind speed in February:
3.8mph - Average wind speed in March:
4mph - Average wind speed in April:
3.9mph - Average wind speed in May:
3.7mph - Average wind speed in June:
3.8mph
- Average wind speed in July:
3.5mph - Average wind speed in August:
3.2mph - Average wind speed in September:
3.3mph - Average wind speed in October:
3.4mph - Average wind speed in November:
3.5mph - Average wind speed in December:
3.7mph
The windiest month (with the highest average wind speed) is March (4mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity
Grants Pass, OR
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (63%).
Average rainfall
Grants Pass, OR
- Average rainfall in January:
3.98" - Average rainfall in February:
3.11" - Average rainfall in March:
3.19" - Average rainfall in April:
2.01" - Average rainfall in May:
1.69" - Average rainfall in June:
0.71"
The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days
Grants Pass, OR
- Average rainfall days in January:
15.3 days - Average rainfall days in February:
15.2 days - Average rainfall days in March:
18.7 days - Average rainfall days in April:
15.9 days - Average rainfall days in May:
11.8 days - Average rainfall days in June:
7.4 days
- Average rainfall days in July:
3.4 days - Average rainfall days in August:
2.5 days - Average rainfall days in September:
5.3 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
13.4 days - Average rainfall days in December:
15.9 days
The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is August (2.5 days).
Average snowfall
Grants Pass, OR
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Grants Pass, OR
- Average snowfall days in January:
1.3 days - Average snowfall days in February:
2.8 days - Average snowfall days in March:
2 days - Average snowfall days in April:
0.2 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
1.1 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Grants Pass, OR
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
4h and 54min - Average sunshine in February:
5h and 12min - Average sunshine in March:
6h and 24min - Average sunshine in April:
8h and 30min - Average sunshine in May:
9h and 54min - Average sunshine in June:
10h and 42min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 48min - Average sunshine in September:
10h and 24min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 42min - Average sunshine in December:
4h and 42min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days
Grants Pass, OR
- Average sunshine days in January:
14.7 days - Average sunshine days in February:
11.6 days - Average sunshine days in March:
10.8 days - Average sunshine days in April:
11.7 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
19.1 days
- Average sunshine days in July:
26.7 days - Average sunshine days in August:
26.5 days - Average sunshine days in September:
23.9 days - Average sunshine days in October:
18.9 days - Average sunshine days in November:
14.3 days - Average sunshine days in December:
13.5 days
The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is March (10.8 days).
Average UV index
Grants Pass, OR
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).
Average cloud cover
Grants Pass, OR
The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility
Grants Pass, OR
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
