Climate and monthly weather forecastWalnut, CA
Climate and monthly weather forecast
Weather in January
January, like December, in Walnut, California, is another comfortable winter month, with an average temperature ranging between min 48.7°F (9.3°C) and max 66°F (18.9°C). In January, Walnut experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 63.7°F (17.6°C) in December to a still enjoyable 66°F (18.9°C). Weather in January »Weather in February
February, the last month of the winter in Walnut, is also an enjoyable month, with an average temperature ranging between min 47.7°F (8.7°C) and max 65.5°F (18.6°C). Walnut observes an average high-temperature of a still enjoyable 65.5°F (18.6°C) in February, barely different from 66°F (18.9°C) in January. Weather in February »Weather in March
The first month of the spring, March, is an agreeable month in Walnut, California, with an average temperature fluctuating between 49.3°F (9.6°C) and 69.3°F (20.7°C). The arrival of March denotes a barely perceptible change in the average high-temperatures to a pleasant 69.3°F (20.7°C) from February's 65.5°F (18.6°C). Weather in March »Weather in April
April, like March, is another pleasant spring month in Walnut, California, with temperature in the range of an average high of 73.2°F (22.9°C) and an average low of 52.2°F (11.2°C). The commencement of April introduces an average high-temperature of a still agreeable 73.2°F (22.9°C), closely mirroring the preceding month. Weather in April »Weather in May
The last month of the spring, May, is a warm month in Walnut, California, with an average temperature fluctuating between 55°F (12.8°C) and 75.7°F (24.3°C). Walnut experiences a minor change to a moderately hot 75.7°F (24.3°C) in average high-temperature during May, closely reflecting April. Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Walnut, California, with an average temperature ranging between min 58.8°F (14.9°C) and max 81.7°F (27.6°C). The shift from May to June sees a slight increase in the average high-temperature, transitioning from a moderately hot 75.7°F (24.3°C) to a still warm 81.7°F (27.6°C). Weather in June »Weather in July
July in Walnut, California, is a tropical summer month, with an average temperature ranging between max 87.8°F (31°C) and min 64.6°F (18.1°C). July's arrival coincides with a marginal rise in the average high-temperature, moving from June's moderately hot 81.7°F (27.6°C) to a tropical 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is another tropical month in Walnut, California, with an average temperature fluctuating between 66.2°F (19°C) and 89.2°F (31.8°C). Walnut notes the warmest temperatures in August, with a high average of 89.2°F (31.8°C) and a low of 66.2°F (19°C). Throughout August, the heat index is calculated to be a hot 91.4°F (33°C). Weather in August »Weather in September
The first month of the autumn, September, is still a hot month in Walnut, California, with an average temperature fluctuating between 87.3°F (30.7°C) and 64.4°F (18°C). Transitioning into September, Walnut records an average high-temperature of a still hot 87.3°F (30.7°C), almost identical to August's 89.2°F (31.8°C). Weather in September »Weather in October
October, like September, in Walnut, California, is a moderately hot autumn month, with an average temperature fluctuating between 59.5°F (15.3°C) and 79.3°F (26.3°C). The arrival of October is marked by a minor reduction in average high-temperature, sliding from a hot 87.3°F (30.7°C) in September to a moderately hot 79.3°F (26.3°C). Weather in October »Weather in November
The last month of the autumn, November, is also an agreeable month in Walnut, California, with temperature in the range of an average low of 53.6°F (12°C) and an average high of 71.8°F (22.1°C). The onset of November is marked by a minor decrease in temperature, transitioning from a moderately hot 79.3°F (26.3°C) in October to a pleasant 71.8°F (22.1°C). Weather in November »Weather in December
December, the first month of the winter in Walnut, is still a refreshing month, with an average temperature varying between 63.7°F (17.6°C) and 47.7°F (8.7°C). December, having an average high-temperature of 63.7°F (17.6°C) and an average low-temperature of 47.7°F (8.7°C), is the coldest month. Weather in December »Updated: Aug 16, 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 43.1 rainfall days, and 6.89" (175mm) of precipitation is accumulated.
January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in Walnut.
February has the least sunshine of the year, with an average of 6.8h of sunshine.
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.
May and June, with an average relative humidity of 56%, are most humid months.
June and August are months with the least rain when the rain falls for 1 days and typically aggregates up to 0.04" (1mm) of rain.
The month with the longest days is June, with an average of 14h and 24min of daylight.
With an average of 12.1h of sunshine, July has the most sunshine of the year.
July and August, with an average maximum UV index of 7, are months with the highest UV index.
In Walnut, August records the average highest temperatures, peaking at 89.2°F (31.8°C) and reaching a low of 66.2°F (19°C).
November is the least humid month in Walnut, with an average relative humidity of 45%.
December, with its high-temperature average of 63.7°F (17.6°C) and a low-temperature average of 47.7°F (8.7°C), is the coldest month in Walnut.
December is the month with the most rainfall. Rain falls for 5.4 days and accumulates 1.57" (40mm) of precipitation.
December has the shortest days of the year in Walnut, with an average of 9h and 54min of daylight.
Average temperature
Walnut, CA
The warmest month (with the highest average high temperature) is August (89.2°F).
The month with the lowest average high temperature is December (63.7°F).
The month with the highest average low temperature is August (66.2°F).
The coldest months (with the lowest average low temperature) are February and December (47.7°F).
Average pressure
Walnut, CA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.9"Hg - Average pressure in August:
29.89"Hg - Average pressure in September:
29.88"Hg - Average pressure in October:
29.94"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.07"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Walnut, CA
- Average wind speed in January:
5.2mph - Average wind speed in February:
4.8mph - Average wind speed in March:
5mph - Average wind speed in April:
5.7mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.2mph
- Average wind speed in July:
5mph - Average wind speed in August:
4.7mph - Average wind speed in September:
4.5mph - Average wind speed in October:
4.6mph - Average wind speed in November:
4.8mph - Average wind speed in December:
5mph
The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity
Walnut, CA
The months with the highest relative humidity are May and June (56%).
The month with the lowest relative humidity is November (45%).
Average rainfall
Walnut, CA
- Average rainfall in January:
1.22" - Average rainfall in February:
1.5" - Average rainfall in March:
0.83" - Average rainfall in April:
0.55" - Average rainfall in May:
0.16" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.04" - Average rainfall in September:
0.08" - Average rainfall in October:
0.16" - Average rainfall in November:
0.63" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is December (1.57").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days
Walnut, CA
- Average rainfall days in January:
4.5 days - Average rainfall days in February:
5.5 days - Average rainfall days in March:
6.6 days - Average rainfall days in April:
5.1 days - Average rainfall days in May:
3.2 days - Average rainfall days in June:
1 days
- Average rainfall days in July:
2.4 days - Average rainfall days in August:
1.4 days - Average rainfall days in September:
2.1 days - Average rainfall days in October:
2.7 days - Average rainfall days in November:
3.2 days - Average rainfall days in December:
5.4 days
The month with the highest number of rainy days is March (6.6 days).
The month with the least rainy days is June (1 days).
Average daylight / Average sunshine
Walnut, CA
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
7h and 0min - Average sunshine in February:
6h and 48min - Average sunshine in March:
8h and 54min - Average sunshine in April:
11h and 18min - Average sunshine in May:
11h and 30min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 48min - Average sunshine in October:
8h and 42min - Average sunshine in November:
7h and 18min - Average sunshine in December:
6h and 54min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 6h and 48min).
Average sunshine days
Walnut, CA
- Average sunshine days in January:
25.8 days - Average sunshine days in February:
22 days - Average sunshine days in March:
24.3 days - Average sunshine days in April:
24.1 days - Average sunshine days in May:
26.9 days - Average sunshine days in June:
28.6 days
- Average sunshine days in July:
27 days - Average sunshine days in August:
28 days - Average sunshine days in September:
26.7 days - Average sunshine days in October:
27 days - Average sunshine days in November:
25.8 days - Average sunshine days in December:
24.4 days
The month with the most sunshine days is June (28.6 days).
The month with the least sunshine days is February (22 days).
Average UV index
Walnut, CA
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover
Walnut, CA
The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility
Walnut, CA
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).
