October weather forecastRiverside, CA
October
Weather in October
In October, the transition from summer to fall continues, reflected by a significant decrease in mean temperature. There is also a marked increase in precipitation with rainfall accumulating to 0.2" (5mm). However, despite the onset of fall, the abundance of sunshine and daylight continues to grace Riverside. The cloud cover increases slightly compared to September, completing the transition into cooler months.Temperature
The arrival of October in Riverside suggests a slight decrease in the average high-temperature, moving from a tropical 88.3°F (31.3°C) in September to a warm 79.5°F (26.4°C). October sees the temperature falling to a mean low of 57.9°F (14.4°C).Humidity
In Riverside, the average relative humidity in October is 47%.Rainfall
In October, in Riverside, the rain falls for 2.6 days. Throughout October, 0.2" (5mm) of precipitation is accumulated. Throughout the year, in Riverside, there are 49 rainfall days, and 7.32" (186mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall in Riverside.Daylight
The average length of the day in October is 11h and 19min.On the first day of October in Riverside, sunrise is at 6:44 am and sunset at 6:33 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 5:57 pm PDT.
Sunshine
The average sunshine in October in Riverside is 8.8h.UV index
In Riverside, the average daily maximum UV index in October is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum high UV index of 5 in October translates into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Riverside, CA
- Average high temperature in October: 79.5°F
The warmest month (with the highest average high temperature) is August (91.2°F).
The month with the lowest average high temperature is December (63.3°F).
- Average low temperature in October: 57.9°F
The month with the highest average low temperature is August (66.4°F).
The coldest month (with the lowest average low temperature) is December (45.9°F).
Average pressure in October
Riverside, CA
- Average pressure in October: 29.94"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in October
Riverside, CA
- Average wind speed in October: 4.7mph
The windiest month (with the highest average wind speed) is May (5.6mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in October
Riverside, CA
- Average humidity in October: 47%
The month with the highest relative humidity is May (56%).
The month with the lowest relative humidity is August (43%).
Average rainfall in October
Riverside, CA
- Average rainfall in October: 0.2"
The wettest months (with the highest rainfall) are February and December (1.61").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in October
Riverside, CA
- Average rainfall days in October: 2.6 days
The month with the highest number of rainy days is March (7.7 days).
The month with the least rainy days is June (1.1 days).
Average snowfall days in October
Riverside, CA
- Average snowfall days in October: 0 days
The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in October /
Average sunshine in October
Riverside, CA
- Average daylight in October: 11h and 18min
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 October: 8h and 48min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The months with the least sunshine are February and December (Average sunshine: 6h and 48min).
Average sunshine days in October
Riverside, CA
- Average sunshine days in October: 26.3 days
The month with the most sunshine days is June (27.9 days).
The month with the least sunshine days is February (21.6 days).
Average UV index in October
Riverside, CA
- Average UV index in October: 5
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in October
Riverside, CA
- Average cloud cover in October: 11
The months with the most cloud cover are February and March (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in October
Riverside, CA
- Average visibility in October: 6mi
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).
