Climate and monthly weather forecastLewiston, CA
Climate and monthly weather forecast
Weather in January
January, like December, is another chilly winter month in Lewiston, California, with an average temperature fluctuating between 47.1°F (8.4°C) and 31.3°F (-0.4°C). The shift into January reveals an average high-temperature of a still chilly 47.1°F (8.4°C), closely mirroring December's climate. Weather in January »Weather in February
The last month of the winter, February, is also a frosty month in Lewiston, California, with an average temperature fluctuating between 30.9°F (-0.6°C) and 47.7°F (8.7°C). As Lewiston steps into February, the average high-temperature is measured at a still frosty 47.7°F (8.7°C), displaying minor differences from January's 47.1°F (8.4°C). Weather in February »Weather in March
March, the first month of the spring in Lewiston, is a fresh month, with an average temperature fluctuating between 32.4°F (0.2°C) and 50°F (10°C). With March's arrival, Lewiston notes an average high-temperature of a fresh 50°F (10°C), closely following the trend of the preceding month. Weather in March »Weather in April
April in Lewiston, California, is a refreshing spring month, with an average temperature fluctuating between 56.3°F (13.5°C) and 35.2°F (1.8°C). April's arrival signals a modest temperature shift, moving from a fresh 50°F (10°C) in March to a refreshing 56.3°F (13.5°C). Weather in April »Weather in May
May, the last month of the spring in Lewiston, is an enjoyable month, with an average temperature varying between 39.9°F (4.4°C) and 64.9°F (18.3°C). A subtle rise in the average high-temperature is observed during May, adjusting from a moderate 56.3°F (13.5°C) in April to a comfortable 64.9°F (18.3°C). Weather in May »Weather in June
June, the first month of the summer in Lewiston, is a moderately hot month, with an average temperature fluctuating between 45.1°F (7.3°C) and 74.7°F (23.7°C). As May gives way to June, the average high-temperature displays an increase, moving from an enjoyable 64.9°F (18.3°C) to a moderately hot 74.7°F (23.7°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Lewiston, California, with an average temperature varying between 84.6°F (29.2°C) and 51.3°F (10.7°C). The warmest period, with an average high-temperature of 84.6°F (29.2°C), falls in July and August. The average heat index in July is evaluated at a hot 87.8°F (31°C). Weather in July »Weather in August
August, the last month of the summer in Lewiston, is also a moderately hot month, with an average temperature fluctuating between 50.7°F (10.4°C) and 84.6°F (29.2°C). July and August are identified as the warmest months, with an average high-temperature of 84.6°F (29.2°C). The heat index value during August is evaluated at a tropical 86°F (30°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Lewiston, California, with an average temperature varying between 46.2°F (7.9°C) and 77.9°F (25.5°C). The transition to September results in a modest reduction in average high-temperature, moving from 84.6°F (29.2°C) in August to a still warm 77.9°F (25.5°C). Weather in September »Weather in October
October, the same as September, is another enjoyable autumn month in Lewiston, California, with temperature in the range of an average high of 66°F (18.9°C) and an average low of 40.8°F (4.9°C). Lewiston in October experiences a subtle temperature decline, with average high-temperatures reducing from a moderately hot 77.9°F (25.5°C) in September to an enjoyable 66°F (18.9°C). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in Lewiston, California, with an average temperature fluctuating between 34.3°F (1.3°C) and 52.9°F (11.6°C). As October transitions to November, the average high-temperature falls from a refreshing 66°F (18.9°C) to a fresh 52.9°F (11.6°C). Weather in November »Weather in December
The first month of the winter, December, is still a chilly month in Lewiston, California, with an average temperature ranging between min 30°F (-1.1°C) and max 45°F (7.2°C). During the coldest month, December, temperatures average a high of 45°F (7.2°C) and a low of 30°F (-1.1°C). Weather in December »Updated: Aug 22, 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
Throughout the year, there are 119.2 rainfall days, and 33.35" (847mm) of precipitation is accumulated.
Months with snowfall are January through April, November and December.
In Lewiston, during the entire year, snow falls for 21.6 days and aggregates up to 28.46" (723mm) of snow.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall in Lewiston. Snow falls for 5.3 days and accumulates 8.35" (212mm) of snow.
With an average relative humidity of 82%, March is the most humid month.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Lewiston, 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.
May through October are months without snowfall.
With an average of 15h and 0min of daylight, June has the longest days of the year.
July and August, with an average high-temperature of 84.6°F (29.2°C), are marked as the warmest months.
July and August are months with the least rain when the rain falls for 3.1 days and typically aggregates up to 0.16" (4mm) of rain.
The month with the most sunshine is July, with an average of 12h of sunshine.
July is the month with the highest UV index in Lewiston, California, with an average maximum UV index of 6.
The least humid month in Lewiston is August, with an average relative humidity of 54%.
Lewiston's coldest weather arrives in December, when temperatures average a high of 45°F (7.2°C) and a low of 30°F (-1.1°C).
December is the month with the most rainfall. Rain falls for 14.5 days and accumulates 6.14" (156mm) of precipitation.
The month with the shortest days in Lewiston is December, with an average of 9h and 18min of daylight.
With an average of 4.6h of sunshine, December has the least sunshine of the year.
Average temperature
Lewiston, CA
The warmest months (with the highest average high temperature) are July and August (84.6°F).
The month with the lowest average high temperature is December (45°F).
The month with the highest average low temperature is July (51.3°F).
The coldest month (with the lowest average low temperature) is December (30°F).
Average pressure
Lewiston, CA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
30.05"Hg - Average pressure in May:
29.99"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed
Lewiston, CA
- Average wind speed in January:
4.3mph - Average wind speed in February:
4.7mph - Average wind speed in March:
4.8mph - Average wind speed in April:
4.8mph - Average wind speed in May:
4.3mph - Average wind speed in June:
4.3mph
- Average wind speed in July:
3.6mph - Average wind speed in August:
3.4mph - Average wind speed in September:
3.7mph - Average wind speed in October:
4.1mph - Average wind speed in November:
4.2mph - Average wind speed in December:
4.2mph
The windiest months (with the highest average wind speed) are March and April (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity
Lewiston, CA
The month with the highest relative humidity is March (82%).
The month with the lowest relative humidity is August (54%).
Average rainfall
Lewiston, CA
- Average rainfall in January:
5.94" - Average rainfall in February:
4.8" - Average rainfall in March:
5.12" - Average rainfall in April:
2.4" - Average rainfall in May:
2.2" - Average rainfall in June:
0.63"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.16" - Average rainfall in September:
0.47" - Average rainfall in October:
1.85" - Average rainfall in November:
3.46" - Average rainfall in December:
6.14"
The wettest month (with the highest rainfall) is December (6.14").
The driest months (with the least rainfall) are July and August (0.16").
Average rainfall days
Lewiston, CA
- Average rainfall days in January:
14.3 days - Average rainfall days in February:
12.3 days - Average rainfall days in March:
18.3 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
11.5 days - Average rainfall days in June:
6.1 days
- Average rainfall days in July:
3.1 days - Average rainfall days in August:
2.5 days - Average rainfall days in September:
3.6 days - Average rainfall days in October:
7.6 days - Average rainfall days in November:
10.9 days - Average rainfall days in December:
14.5 days
The month with the highest number of rainy days is March (18.3 days).
The month with the least rainy days is August (2.5 days).
Average snowfall
Lewiston, CA
The month with the highest snowfall is February (8.35").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Lewiston, CA
- Average snowfall days in January:
3.7 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
4.7 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 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:
1.7 days - Average snowfall days in December:
4.3 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
Lewiston, CA
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
5h and 12min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 54min - Average sunshine in May:
10h and 6min - Average sunshine in June:
11h and 18min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
11h and 54min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 48min - Average sunshine in December:
4h and 36min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days
Lewiston, CA
- Average sunshine days in January:
13.5 days - Average sunshine days in February:
12.7 days - Average sunshine days in March:
10.6 days - Average sunshine days in April:
13 days - Average sunshine days in May:
17.3 days - Average sunshine days in June:
22.1 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
26.8 days - Average sunshine days in September:
24.8 days - Average sunshine days in October:
22.1 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
13.3 days
The month with the most sunshine days is August (26.8 days).
The month with the least sunshine days is March (10.6 days).
Average UV index
Lewiston, CA
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
Lewiston, CA
The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility
Lewiston, CA
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are March and December (4mi).
