October weather forecastRialto, CA
October
Weather in October
October, like September, in Rialto, California, is a moderately hot autumn month, with temperature in the range of an average high of 77.9°F (25.5°C) and an average low of 56.1°F (13.4°C).Temperature
The shift to October brings a decrease in the average high-temperature, falling from a hot 87.8°F (31°C) in September to a warm 77.9°F (25.5°C). With a significant temperature contrast, nighttime temperatures in Rialto hover around an average low of 56.1°F (13.4°C) in October.Humidity
In October, the average relative humidity is 43%.Rainfall
In Rialto, during October, the rain falls for 2.3 days and regularly aggregates up to 0.16" (4mm) of precipitation. In Rialto, during the entire year, the rain falls for 43.5 days and collects up to 5.43" (138mm) of precipitation.Snowfall
In Rialto, snow does not fall in January, March through December.Daylight
In October, the average length of the day in Rialto is 11h and 19min.On the first day of the month, sunrise is at 6:44 am and sunset at 6:33 pm. On the last day of October, in Rialto, sunrise is at 7:08 am and sunset at 5:57 pm PDT.
Sunshine
In October, the average sunshine in Rialto, California, is 9h.UV index
In October, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In October, the maximum UV index of 5 suggests this advice:
Take precautions - Protection against skin and eye damage is obliged. Minimize direct exposure to the Sun during midday when its radiation is at its peak. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Rialto, CA
- Average high temperature in October: 77.9°F
The warmest month (with the highest average high temperature) is August (91.9°F).
The month with the lowest average high temperature is December (59.9°F).
- Average low temperature in October: 56.1°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (43.3°F).
Average pressure in October
Rialto, 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 (29.85"Hg).
Average wind speed in October
Rialto, CA
- Average wind speed in October: 4.9mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).
Average humidity in October
Rialto, CA
- Average humidity in October: 43%
The months with the highest relative humidity are February and March (52%).
The month with the lowest relative humidity is August (38%).
Average rainfall in October
Rialto, CA
- Average rainfall in October: 0.16"
The wettest months (with the highest rainfall) are February and December (1.14").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in October
Rialto, CA
- Average rainfall days in October: 2.3 days
The month with the highest number of rainy days is December (5.5 days).
The month with the least rainy days is June (1.3 days).
Average snowfall days in October
Rialto, 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
Rialto, 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: 9h and 0min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in October
Rialto, CA
- Average sunshine days in October: 27.2 days
The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22.6 days).
Average UV index in October
Rialto, CA
- Average UV index in October: 5
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in October
Rialto, CA
- Average cloud cover in October: 8
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).
Average visibility in October
Rialto, 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).
