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Forecast

St Helena (33.7583°S, 150.5666°E, 294m AMSL) set as my default location ›

  1. My MLA

  2. Current condition

    TODAY
    Sunny 27°
    Chance of rain: 30%
    Likely amount: < 1mm
    First
    light
    Sunrise Sunset Last light
    Sunrise Sunset
    5:33am EST 5:58am EST 5:49pm EST 6:14pm EST
    NOW
    24.7° Feels Like: 21.5°
    Relative Humidity: 25%
    Dew: 3.4°
    Wind: NNE 9km/h
    Gust: NNE 9km/h
    Rainfall since 9am: 0.0mm
    Pressure:  
  3. Today Weather

    St Helena
    Now
    25.1°c
    Feels Like:
    21.2°
    Wind:
    N 11km/h
    Gusts:
    13km/h
    Humidity:
    22%
    Sunny
     
    Min
    27°
    Max
    Today in St Helena
    Mostly sunny. Patches of frost early this morning. Winds W 15 to 20 km/h becoming light in the evening then becoming W/NW 15 to 20 km/h in the late evening. Daytime maximum temperatures 20 to 28.
    Tomorrow
    Possible shower
    15°
    Min
    27°
    Max
    Becoming cloudy. High chance of rain in the south, slight chance elsewhere. Winds W/NW 30 to 45 km/h shifting E/SE 15 to 20 km/h in the evening. Overnight temperatures falling to between 6 and 12 with daytime temperatures reaching 21 to 29.
  4. Radar

  5. Popup Radar

  6. Warnings

  7. Next 48 Hours


    Next 48 Hours


  8. 7 day forecast

    Today: Mostly sunny. Patches of frost early this morning. Winds W 15 to 20 km/h becoming light in the evening then becoming W/NW 15 to 20 km/h in the late evening. Daytime maximum temperatures 20 to 28.

    Forecast for St Helena (33.7583°S, 150.5666°E, 294m AMSL)
      Sun Mon Tue Wed Thu Fri Sat
    Summary Sunny Possible shower Rain Possible shower Possible shower Mostly sunny Possible shower
    Minimum 15° 12° 13° 14°
    Maximum 27° 27° 12° 15° 20° 25° 25°
    Chance of rain 30% 80% 70% 70% 60% 60% 80%
    Likely amount < 1mm 10-20mm 5-10mm 5-10mm 1-5mm 1-5mm 10-20mm
    UV index High High Moderate High High - -
    Frost risk Nil Nil Nil Nil Nil Nil Nil
      9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm 9am 3pm
    Wind speed 4
    (km/h)
    5
    (km/h)
    8
    (km/h)
    9
    (km/h)
    14
    (km/h)
    18
    (km/h)
    16
    (km/h)
    15
    (km/h)
    5
    (km/h)
    10
    (km/h)
    7
    (km/h)
    10
    (km/h)
    12
    (km/h)
    9
    (km/h)
    Wind direction NNW NNW NW WSW SSW S SSW S SE E NNE NE N NNW
    Relative humidity 39% 24% 34% 33% 92% 85% 80% 80% 89% 77% 81% 60% 67% 63%
    Dew point 5°C 5°C 6°C 9°C 8°C 10°C 9°C 12°C 15°C 16°C 15°C 17°C 16°C 18°C
  9. 28 Day Rainfall forecast

    St Helena Rain Forecast


    St Helena 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    15
    16
    HIGH
    17
    MEDIUM
    18
    LOW
    19
    LOW
    20
    LOW
    21
    HIGH
    22
    HIGH
    23
    MEDIUM
    24
    LOW
    25
    LOW
    26
    27
    28
    29
    LOW
    30
    Oct 1
    2
    LOW
    3
    4
    5
    6
    7
    8
    9
    LOW
    10
    MEDIUM
    11
    LOW
    12
    LOW
    13
    LOW
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Sep15

    Issue Notes

    The hemispheric long wave pattern has remained stable in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, and the Atlantic Ocean.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 3 October to 7 October, 12 October to 16 October, and 18 October to 22 October. Rain events originating in the tropics and moving south are possible about 8 October to 12 October. Over Western Australia the strongest cold fronts should occur about 26 September to 30 September, 10 October to 14 October, and 14 October to 18 October.

  10. 12 Month Rainfall Forecast

    St Helena Rain Forecast


    St Helena 12-month Rainfall Forecast
    Sep
    Oct
    Nov
    Dec
    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    2019
    2020
    2
    2
    4
    5
    5
    5
    5
    1
    4
    9
    5
    4
    10
    5
    0
    1
    2 - 3
    4 - 7
    8 - 9
    10
    Well below normal
    Below normal
    Near normal
    Above normal
    Well above normal

    Issue Notes - Issued Sep 10

    ENSO status: Neutral IOD status: Positive Sea surface temperatures (SSTs) continued the cooling trend over the central Pacific during August, with areas in the eastern equatorial Pacific exhibiting below average temperatures for the first time in about two years. The Nino3.4 index lingered between 0.2 and 0.1 through the month of August. The Southern Oscillation Index (SOI) recorded a value of -4.4 during the past month, which remains in neutral territory. Current consensus suggests warmer than average SSTs will persist across the equatorial Pacific Ocean through the austral spring, but well within neutral values. Although, three out of eight international models maintain a slightly warmer than average Pacific Ocean through the end of 2019, none of these are likely to reach El Nino thresholds during the 2019/2020 summer. Moreover, the IRI ENSO forecast suggests less than 40% of another El Nino developing over the next 12 months, with a neutral ENSO the most likely outcome. To the west of Australia, the Indian Ocean Dipole (IOD) remains strongly positive. All six international models maintain a strong positive event until the beginning of the summer. The climate outlook for spring favours below average rainfall across the southern half, and in particular the eastern half of the continent. During Positive IODs, central and southeastern Australia tend to see a reduction in rainfall during the end of winter and spring due to a reduction of moisture streaming from the northwest. On the other hand, far southern Victoria and western Tasmania could see above average rainfall during this period as a sudden stratospheric warming (SSW) over Antarctica looks to enhance the negative phase of the southern annular mode (SAM) over the coming months.

  11. Long range rainfall forecast

    St Helena Rain Forecast


    St Helena 28-day Rainfall Forecast
    SUN
    MON
    TUE
    WED
    THU
    FRI
    SAT
    15
    16
    HIGH
    17
    MEDIUM
    18
    LOW
    19
    LOW
    20
    LOW
    21
    HIGH
    22
    HIGH
    23
    MEDIUM
    24
    LOW
    25
    LOW
    26
    27
    28
    29
    LOW
    30
    Oct 1
    2
    LOW
    3
    4
    5
    6
    7
    8
    9
    LOW
    10
    MEDIUM
    11
    LOW
    12
    LOW
    13
    LOW
    CHANCE OF RAINFALL WITHIN DISTRICT
    NIL < 25%
    LOW 25% to 50%
    MEDIUM 50% to 75%
    HIGH ≥ 75%
    Issued Sep15

    Issue Notes

    The hemispheric long wave pattern has remained stable in recent weeks. There are five main troughs. Currently the most significant troughs are near the longitudes of South Africa, the Indian Ocean, eastern Australia, the south Pacific, and the Atlantic Ocean.

    Summary:

    Over southern and eastern Australia the cold front events with potential to bring widespread rain are now expected about 3 October to 7 October, 12 October to 16 October, and 18 October to 22 October. Rain events originating in the tropics and moving south are possible about 8 October to 12 October. Over Western Australia the strongest cold fronts should occur about 26 September to 30 September, 10 October to 14 October, and 14 October to 18 October.

  12. Popup - Daily historical

  13. Past 5 Days

    St Helena Past 5 Days

    This Month
    Minimum Maximum Rainfall
    Wednesday
    Sep 11
    6.9 °C 20.4 °C
    0.0 mm
    Thursday
    Sep 12
    6.9 °C 19.5 °C
    0.0 mm
    Friday
    Sep 13
    10.6 °C 22.0 °C
    0.0 mm
    Saturday
    Sep 14
    10.4 °C 22.5 °C
    0.0 mm
    Sunday
    Sep 15
    7.7 °C -
    0.0 mm
    Legend
  14. Almanac

    Almanac


    St Helena minimum temp history (33.7583°S, 150.5666°E, 294m AMSL)
    MAXIMUM TEMPERATURE MINIMUM TEMPERATURE
    Hottest this month 27.5° 04/09/2019 Coldest this month 5.2° 10/09/2019
    Hottest on record 32.5 30/09/2014 Coldest on record 3.1 11/09/2008
    Hottest this year 39.6° 05/01/2019 Coldest this year 2.8° 13/08/2019
    Long term average 21.3° Long term average 9.4°
    Average this month 21.0° Average this month 8.6°
    Hottest September On Record Avg. max. temp. 24.3° 2013 Coldest September on record Avg. min. temp. 8.0° 2007
    St Helena rainfall history (33.7583°S, 150.5666°E, 294m AMSL)
    RAINFALL
    Wettest This Month 0.6mm 07/09/2019 Total This Month 0.6mm
    1.0 days
    Long Term Average 54.2mm 7.0 days Wettest September on record 240.6mm 2013
  15. Popup - Radar

  16. Year to Date

    St Helena Year To Date

    Average Rainfall To Sep 756.5mm 72.9 day(s)
    Total For 2019 397.2mm 69.0 day(s)
    Total To This Day 2018 316.2mm 59.0 day(s)
    Wettest Day 27.4mm Mar17
    Lowest Temperature 2.8°C Aug13
    Highest Temperature 39.6°C Jan 5
  17. Popup - Monthly historical

  18. Climatology

    St Helena Climatology

    Long-Term Averages
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
    Mean Max (°C) 28.6 26.7 25.2 22.0 19.4 16.0 16.0 17.9 21.3 23.9 25.8 26.6 22.4
    Mean Min (°C) 17.2 17.0 15.5 12.2 9.4 7.8 6.4 7.0 9.4 11.6 14.1 15.3 11.9
    Mean Rain (mm) 121.1 131.0 123.5 82.5 68.2 71.2 54.0 50.8 54.2 73.3 95.3 98.2 1023.7
    Mean Rain Days 10.4 10.6 10.6 8.2 6.9 7.1 5.9 6.2 7.0 8.3 9.3 9.8 97.2