Our Proprietary 10-Day Forecast

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Current warnings over San Dimas, California
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over San Dimas, California red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over San Dimas, California red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Los Angeles County, CA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near San Dimas, California

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in San Dimas, CA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over San Dimas, CA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in San Dimas, CA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near San Dimas, California

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Los Angeles County, California

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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  • American GFS
  • Canadian GDPS GEM
  • German DWD ICON
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  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
San Dimas, CA Climate Summary

General Climate

    •   San Dimas, CA has a Mediterranean climate, with mild, wet winters and warm, dry summers.
    •   The average annual temperature is 62.6°F (17°C).
    •   The average annual precipitation is 18.6 inches (47.2 cm).

Temperature

    •   The average temperature in January, the coldest month, is 46.9°F (8.3°C).
    •   The average temperature in July, the warmest month, is 80.6°F (27°C).
    •   The highest temperature ever recorded in San Dimas was 117°F (47.2°C) on July 22, 2006.
    •   The lowest temperature ever recorded in San Dimas was 17°F (-8.3°C) on January 17, 1949.

Precipitation

    •   The average annual precipitation in San Dimas is 18.6 inches (47.2 cm).
    •   The majority of the precipitation falls during the winter months, from November to April.
    •   The driest month is July, with an average precipitation of 0.05 inches (0.13 cm).
    •   The wettest month is February, with an average precipitation of 3.43 inches (8.71 cm).

Sunshine

    •   San Dimas receives an average of 289 sunny days per year.
    •   The sunniest month is July, with an average of 11.3 hours of sunshine per day.
    •   The cloudiest month is December, with an average of 5.2 hours of sunshine per day.

Humidity

    •   The average annual relative humidity in San Dimas is 66%.
    •   The most humid month is January, with an average relative humidity of 73%.
    •   The least humid month is August, with an average relative humidity of 52%.

Wind

    •   The average annual wind speed in San Dimas is 5.3 mph (8.5 km/h).
    •   The windiest month is April, with an average wind speed of 6.1 mph (9.8 km/h).
    •   The calmest month is October, with an average wind speed of 4.5 mph (7.2 km/h).

Climate Change

    •   The climate of San Dimas is changing, as is the climate of the rest of the world.
    •   The average annual temperature in San Dimas has increased by 1.8°F (1°C) since 1895.
    •   The average annual precipitation in San Dimas has decreased by 2.5 inches (6.4 cm) since 1895.
    •   The number of days with extreme heat (temperatures above 95°F (35°C)) has increased in San Dimas since 1895.
    •   The number of days with extreme cold (temperatures below 32°F (0°C)) has decreased in San Dimas since 1895.

Climate Impacts

    •   The changing climate is having a number of impacts on San Dimas, including:
    •   More frequent and severe heat waves
    •   More frequent and severe droughts
    •   More frequent and severe wildfires
    •   Increased flooding
    •   Changes in plant and animal life
    •   Changes in human health

Climate Adaptation and Mitigation

    •   The City of San Dimas is taking steps to adapt to and mitigate the impacts of climate change, including:
    •   Developing a Climate Action Plan
    •   Investing in energy efficiency and renewable energy
    •   Planting trees and other vegetation
    •   Improving water conservation
    •   Preparing for extreme weather events

Conclusion

The climate of San Dimas is changing, and these changes are having a number of impacts on the city and its residents. The City of San Dimas is taking steps to adapt to and mitigate these impacts, but more needs to be done.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   San Dimas is home to the San Dimas Experimental Forest, a 6,000-acre research facility studying the effects of forest management on water quality and wildlife.

    •   The city is known for its \

Tourist Attractions
1. Raging Waters Los Angeles: A water park with over 50 acres of thrilling water slides, wave pools, and other attractions.

2. Pacific Railroad Museum: A museum dedicated to the history of railroads in California, with a collection of over 100 locomotives and railcars.

3. Puddingstone Reservoir: A scenic reservoir surrounded by rolling hills and hiking trails, offering opportunities for fishing, boating, and picnicking.

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